DIAGNOSIS AND TESTING

Transcription

1 Vehicle Dynamic Systems DIAGNOSIS AND TESTING Anti-Lock Control Traction Control and Stability Assist Special Tool(s) Principles of Operation 73III Automotive Meter 105-R0057 or equivalent Flex Probe Kit 105-R025B or equivalent Rotunda Active Wheel Speed Sensor Tester 105-R0110 Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool ABS with Traction Control, Electronic Stability Control (ESC) and Roll Stability Control (RSC) The ABS module with traction control and roll stability control (RSC) manages anti-lock braking to maintain vehicle control during deceleration and performs additional functions specific to traction control and RSC. ABS Operation When the ignition switch is in the RUN position, the ABS module does a preliminary electrical check and, at approximately 20 km/h (12 mph), the hydraulic pump motor is turned on for approximately 1/2 second. During this time a buzzing or humming noise may be heard and a vibration maybe felt in the brake pedal. This is a normal condition. Any malfunction of the ABS disables the stability assist and the ABS warning indicator illuminates. However, the power-assist braking system functions normally. The ABS module monitors and compares the rotational speed of each wheel. Wheel speeds are measured by the wheel speed sensor, which electrically senses each tooth of the sensor ring as it passes through the magnetic field of the sensor. When the ABS module detects an impending wheel lock, the ABS module commands the hydraulic pump motor on and commands the hydraulic control unit (HCU) to open and close the appropriate solenoid valves to modulate the brake pressure to the individual brake caliper(s). Once the affected wheel(s) return to the desired speed, the ABS module commands the HCU to return the solenoid valves to their normal position and normal base brake operation is restored. The ABS module must be configured when a new ABS module is installed. Traction Control When the drive wheels lose traction and begin to spin, with vehicle speed under 100 km/h (62 mph), the ABS module commands the hydraulic pump motor on and commands the HCU to open and close the appropriate solenoid valves to modulate the brake pressure to the brake caliper(s) while simultaneously sending a request to the PCM over the high-speed controller area network (HS-CAN) bus to reduce engine torque to maintain vehicle traction. The PCM accomplishes this by minor incremental timing changes and fewer fuel injector pulses until the ABS module ends the request. The request ends when the driven wheel speed returns to the desired speed. After the vehicle speed exceeds 100 km/h (62 mph), the traction control is accomplished only through the PCM torque control. The traction control system can be deactivated by pressing the stability/traction control switch in the instrument panel. Copyright 2007, Ford Motor Company Last updated: 8/12/2008

2 Vehicle Dynamic Systems When the traction control system activates, any of the following can occur: A small deceleration or a reduction in the acceleration of the vehicle The traction control indicator in the instrument cluster flashes If the driver s foot is on the brake pedal, a vibration will be felt in the pedal much like ABS Electronic Stability Control (ESC) The electronic stability control (ESC) system constantly monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering input and the yaw rate sensor with that of the actual vehicle motion. The ESC system monitors information from the throttle position (TP) sensor, the steering wheel rotation sensor (steering wheel angle and rate of change) and a yaw rate sensor (integral to the stability control sensor cluster) that measures changes in vehicle direction. If the ESC system determines from all these inputs that the vehicle is unable to travel in the intended direction, the system adjusts the brake torque at specific wheels in response to direct measurement of the vehicle motion and reduces engine torque to allow the vehicle to follow the intended course. The ESC system can be deactivated by pressing the stability/traction control switch in the instrument panel. When the ESC system activates, any of the following can occur: A rumble or grinding sound much like ABS or traction control A small deceleration or a reduction in the acceleration of the vehicle The roll stability control (RSC) indicator flashes If the driver s foot is on the brake pedal, a vibration will be felt in the pedal much like ABS Roll Stability Control (RSC) The roll stability control (RSC) system constantly monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering input and brake application with that of the actual vehicle motion. The system does not activate when the vehicle is traveling in reverse; however, the standard ABS and traction control continue to function as usual. The RSC system monitors information from the wheel speed sensors, the throttle position sensor, the steering wheel rotation sensor (steering wheel angle and rate of change) and a roll-rate sensor (integral to the stability control sensor cluster) that measures changes in vehicle motion. If the RSC system determines from all these inputs that conditions exist for a potential roll-over event, the system adjusts the brake torque at specific wheels in response to direct measurement of the vehicle roll motion and reduces engine torque to make the vehicle more stable. By adjusting brake torque, the system can reduce the cornering forces and, therefore, the total roll moment acting on the vehicle. The RSC system can be deactivated by pressing the stability/traction control switch in the instrument panel. When the RSC system activates, any of the following can occur: A rumble or grinding sound much like ABS or traction control A small deceleration or a reduction in the acceleration of the vehicle The RSC indicator flashes If the driver s foot is on the brake pedal, a vibration will be felt in the pedal much like ABS Some drivers may notice a slight movement of the brake pedal when the system checks itself. The brake pedal moves when an active test of the brake booster is run. During this test a small amount of pressure is generated at the master cylinder, but no pressure is generated in the brake calipers. Stability/Traction Control Switch The stability/traction control switch is hard-wired to the instrument cluster module. The instrument cluster module communicates the stability/traction control switch status to the ABS module via the HS-CAN bus.

3 Vehicle Dynamic Systems The stability/traction control switch allows the driver to control use of the ESC/RSC and traction control system. This is independent of the ABS function, which cannot be switched OFF by the driver. The ESC/RSC and traction control system status is indicated by a light in the stability/traction control switch. When the stability/traction control switch is set to OFF, the system is disabled at and below 32 km/h (20 mph). The system will automatically restore to full functionality every time the vehicle speed exceeds 32 km/h (20 mph) or when the ignition switch is cycled from OFF to RUN. However, the stability/traction control switch OFF indicator remains illuminated until the switch is pressed a second time. The ABS function continues to work as designed unless the yellow ABS warning indicator is illuminated. rmal braking function always occurs, unless the red brake warning indicator is illuminated. Electronic Brake Distribution (EBD) The HCU is used as an electronic proportioning valve for electronic brake distribution (EBD). The HCU controls the brake fluid pressure to the rear brakes to prevent them from applying before the front brakes. If ABS is disabled due to DTCs being present in the ABS module, EBD will also be disabled. Instrument cluster failure or a missing instrument cluster message on the HS-CAN bus will also disable EBD. Stability Control Sensor Cluster The sensor cluster (also called inertial module) consists of the yaw rate sensor, roll rate sensor, lateral accelerometer and longitudinal accelerometer. The lateral accelerometer measures the acceleration which corresponds to the force involved when the vehicle slides sideways. This acceleration has 2 forms. The first is the centrifugal acceleration which is generated when the vehicle travels around in a circle. The second is the acceleration due to gravity. On level ground there is no contribution from this acceleration. However, if the vehicle is parked sideways on a bank or incline, the sensor measures some lateral acceleration due to gravity even though the vehicle is not moving. The longitudinal accelerometer measures the acceleration corresponding to the force involved when the vehicle moves forward and rearward in the horizontal plane, along the centerline of the vehicle s front and rear wheels. The yaw rate sensor measures the relative vehicle motion about the vertical axis through its center of gravity. The roll rate sensor measures the rate of rotation along the front to rear horizontal axis. Steering Wheel Rotation Sensor The steering wheel rotation sensor measures the rate of rotation of the steering wheel by monitoring the steering wheel rotation ring as it passes through the sensor gap. The steering wheel rotation sensor uses 2 signal lines to transmit information to the ABS module about whether the steering wheel is being turned left or right and how far it is being turned. The steering wheel rotation sensor does not indicate the absolute position of the steering wheel relative to straight-ahead. The stability assist system learns this position by comparing the steering wheel position with other signals and storing the position it has learned. The stability assist system confirms this position and modifies it as necessary during every new driving cycle. ABS Module Calibration If installing a new ABS module, HCU, steering wheel rotation sensor or stability control sensor cluster, the calibration procedure must be carried out. The calibration procedure is required for the ABS module to learn the zero-position of the various ESC/RSC sensors and components. To calibrate the ABS module, connect the scan tool and carry out the Interactive Vehicle Dynamics (IVD) Initialization sequence. If a DTC is logged for any component of the ESC/RSC system, the DTC must be cleared or repaired before carrying out the initialization sequence. The need to calibrate the ABS module is also indicated by the RSC indicator on the instrument cluster module flashing once every 2 seconds. The indicator flashes after clearing the DTCs that are associated with the RSC system. If a DTC is retrieved after calibration, refer to the ABS Module DTC Chart in this section. When carrying out the initialization sequence for the ABS module, the vehicle must be on a level surface, must not be moving and the ignition switch must be in the RUN position.

4 Vehicle Dynamic Systems When carrying out the initialization sequence for the Visual Inspection Chart ABS module after installing a new steering wheel Mechanical Electrical rotation sensor, the ignition switch must be in the Base brake system ABS module RUN position with the engine running and the Hydraulic control unit Battery junction box steering wheel must be rotated back and forth from (HCU) (BJB) fuse(s): lock position to lock position. Steering wheel rotation 11 (40A) sensor ring 16 (40A) Inspection and Verification Tire pressure Brake pedal position Tire size or mismatched (BPP) switch Identifying the Brake System tires Central junction box Wheel speed sensor ring (CJB) fuse(s): Two ABS systems are available for this vehicle: 2 (10A) standard ABS and ABS enhanced with traction 22 (15A) control and stability assist. ABS with traction Stability control sensor control and stability assist may also be called cluster electronic stability control (ESC), roll stability Stability/traction control control (RSC), AdvanceTrac, or interactive vehicle switch Steering wheel rotation dynamics (IVD) by the scan tool and other service sensor publications. Traction control switch Vehicles that are equipped with traction control and Wheel speed sensor Wiring, terminals or stability assist can be identified by the presence of connectors individual left and right rear wheel speed sensors. Vehicles with standard ABS can be identified by the absence of rear wheel speed sensors. If the vehicle is equipped with standard ABS, refer to Anti-Lock Control in this section to continue diagnosis of this system. 5. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. 6. NOTE: Make sure to use the latest scan tool software release. 1. Verify the customer concern. If the cause is not visually evident, connect the 2. Verify the stop lamps operate correctly by scan tool to the data link connector (DLC). pressing and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to Section If the stoplamps operate correctly, proceed to the next step. 7. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM. If the scan tool does not communicate with the VCM: 3. Verify the base brake system operates correctly. If any concerns are present, address them before continuing with any ABS concerns. Refer to check the VCM connection to the vehicle. Section If the base brake system check the scan tool connection to the VCM. operates correctly, proceed to the next step. refer to Section , Power To The 4. Visually inspect for obvious signs of Scan Tool, to diagnose no communication mechanical or electrical damage. with the scan tool. 8. If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. refer to Section to diagnose no response from the PCM.

5 Vehicle Dynamic Systems Carry out the network test. 11. If the DTCs retrieved are related to the concern, If the scan tool responds with no go to the ABS Module DTC Chart or the communication for one or more modules, Instrument Cluster DTC Chart. For all other refer to Section DTCs, refer to Section If the network test passes, retrieve and 12. If no DTCs related to the concern are retrieved, record continuous memory DTCs. GO to Symptom Chart. 10. Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module and the instrument cluster. ABS Module DTC Chart DTC Description Source Action B1104 Steering Angle Sensor Signal Error ABS Module GO to Pinpoint Test K. B1317 Battery Voltage High ABS Module GO to Pinpoint Test G. B1318 Battery Voltage Low ABS Module GO to Pinpoint Test G. B1342 ECU is Faulted ABS Module NOTE: If other DTCs are present, REPAIR them before installing a new component. CLEAR the DTCs. CARRY OUT the self-test and RETRIEVE the DTCs. If DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. B211B Satellite ECU (Stability Control Sensor ABS Module CHECK the stability control sensor Cluster) is Faulted cluster electrical connector and wiring for water intrusion. REPAIR as necessary. If OK, INSTALL a new sensor cluster. REFER to Stability Control Sensor Cluster in this section. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. B2900 VIN Mismatch ABS Module GO to Pinpoint Test R. C1095 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test H. Failure C1096 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test H. Open

6 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1115 ABS Power Relay Output Short Circuit ABS Module to Battery NOTE: If other DTCs are present, REPAIR them before installing a new component. CLEAR all DTCs. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop. RETRIEVE the DTCs. If DTC C1115 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1145 RF Wheel Speed Sensor Input Circuit ABS Module GO to Pinpoint Test I. Failure C1155 LF Wheel Speed Sensor Input Circuit ABS Module GO to Pinpoint Test I. Failure C1165 RR Wheel Speed Sensor Input Circuit ABS Module GO to Pinpoint Test I. Failure C1175 LR Wheel Speed Sensor Input Circuit ABS Module GO to Pinpoint Test I. Failure C1185 ABS Power Relay Output Circuit Failure ABS Module NOTE: REPAIR all other DTCs prior to diagnosing this one. CLEAR all DTCs. RETRIEVE DTCs. If the DTC is retrieve again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1194 ABS Outlet Valve Coil LF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1194 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

7 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1198 ABS Inlet Valve Coil LF Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1198 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1210 ABS Outlet Valve Coil RF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1210 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1214 ABS Inlet Valve Coil RF Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1214 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1222 Wheel Speed Mismatch ABS Module GO to Pinpoint Test J. C1233 LF Wheel Speed Input Signal Missing ABS Module GO to Pinpoint Test J. C1234 RF Wheel Speed Input Signal Missing ABS Module GO to Pinpoint Test J. C1235 RR Wheel Speed Input Signal Missing ABS Module GO to Pinpoint Test J. C1236 LR Wheel Speed Input Signal Missing ABS Module GO to Pinpoint Test J. C1242 ABS Outlet Valve Coil LR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1242 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

8 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1246 ABS Outlet Valve Coil RR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1246 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1250 ABS Inlet Valve Coil LR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1250 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1254 ABS Inlet Valve Coil RR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1254 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1277 Steering Wheel Angle 1 and 2 Circuit ABS Module GO to Pinpoint Test K. Failure C1278 Steering Wheel Angle 1 and 2 Signal ABS Module GO to Pinpoint Test K. Faulted C1279 Yaw Rate Sensor Circuit Failure ABS Module GO to Pinpoint Test L. C1280 Yaw Rate Sensor Signal Fault ABS Module GO to Pinpoint Test L. C1281 Lateral Accelerometer Circuit Failure ABS Module GO to Pinpoint Test L. C1282 Lateral Accelerometer Signal Fault ABS Module GO to Pinpoint Test L. C1288 Pressure Transducer Main/Primary Input ABS Module GO to Pinpoint Test M. Circuit Failure C1329 ABS Outlet Valve Coil RF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

9 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1330 ABS Outlet Valve Coil LR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1331 ABS Outlet Valve Coil RR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1332 ABS Outlet Valve Coil LF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1333 ABS Inlet Valve Coil LR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1334 ABS Inlet Valve Coil LF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1335 ABS Inlet Valve Coil RF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

10 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1336 ABS Inlet Valve Coil RR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1404 Traction Control Valve Rear Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1404 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1410 Traction Control Valve LF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1410 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1446 Base Brake Failure/Brake Switch Stuck ABS Module GO to Pinpoint Test N. or Inoperative C1516 Roll Rate Sensor Signal Fault ABS Module GO to Pinpoint Test L. C1517 Roll Rate Sensor Circuit Fault ABS Module GO to Pinpoint Test L. C1527 Traction Control Rear Valve Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1528 Traction Control LF Valve Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

11 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1530 Dynamic Stability Control RF Valve ABS Module CLEAR all DTCs. DRIVE the vehicle. Circuit Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1531 Dynamic Stability Control LF Valve ABS Module CLEAR all DTCs. DRIVE the vehicle. Circuit Excessive Temperature RETRIEVE the DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1730 Reference Voltage Out of Range (+5 V) ABS Module If any other DTCs are present, diagnose those DTCs first. CLEAR all DTCs. DRIVE the vehicle. RETRIEVE DTCs. If the DTC is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1957 Dynamic Stability Control Valve RF ABS Module CLEAR all DTCs. DRIVE the vehicle. Circuit Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1957 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. C1958 Dynamic Stability Control Valve LF ABS Module CLEAR all DTCs. DRIVE the vehicle. Circuit Failure RETRIEVE the DTCs. If multiple coil DTCs are retrieved, GO to Pinpoint Test G. If only DTC C1958 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

12 Vehicle Dynamic Systems ABS Module DTC Chart DTC Description Source Action C1963 Stability Control Inhibit Warning ABS Module C1991 Module Calibration Failure ABS Module NOTE: This DTC will not clear until the vehicle has been driven above 48 km/h (30 mph) with input from the steering wheel rotation sensor. REPAIR all other DTCs before repairing DTC C1963. GO to Pinpoint Test K. NOTE: REPAIR all other DTCs prior to diagnosing this DTC. GO to Pinpoint Test O. C2769 Longitudinal Acceleration Sensor ABS Module GO to Pinpoint Test L. Electrical Failure C2770 Longitudinal Acceleration Sensor ABS Module GO to Pinpoint Test L. Plausibility Failure U0028 Vehicle Communication Bus Off ABS Module GO to Pinpoint Test L. U0073 Control Module Communication Bus Off ABS Module REFER to Section to diagnose the high-speed controller area network (HS-CAN) bus. U0115 Lost Communication with ECM/PCM - ABS Module REPAIR all other DTCs first. If DTC Secondary U0115 is still present REFER to Section to diagnose the HS-CAN bus. U0155 Lost Communication with Instrument ABS Module REPAIR all other DTCs first. If DTC Panel Cluster U0155 is still present REFER to Section to diagnose the HS-CAN bus. U2050 Application Present ABS Module CLEAR the DTCs. REPEAT the self-test. RETRIEVE the DTCs. If DTC U2050 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTC. REPEAT the self-test. U2051 One or More Calibration Files ABS Module CLEAR the DTCs. CARRY OUT the Missing/Corrupt ABS module self-test. RETRIEVE and RECORD any DTCs. If DTC U2051 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTC. REPEAT the self-test.

13 Vehicle Dynamic Systems Instrument Cluster DTC Chart DTC Description Source Action C1093 Traction Control Disable Switch Circuit Instrument GO to Pinpoint Test P. Failure Cluster C1105 Traction Control Disable Lamp Circuit Instrument GO to Pinpoint Test Q. Short to Battery Cluster All Other instrument cluster DTCs Instrument REFER to the Master DTC Chart in Cluster Section Symptom Chart Symptom Chart Condition Possible Sources Action The red BRAKE warning DTCs present in the ABS REFER to the ABS Module indicator and the yellow ABS module DTC Chart in this section. warning indicator are both illuminated The ABS warning indicator is Wiring, terminals or REFER to Section to never on connectors continue diagnosis of the Instrument cluster warning indicator. The red BRAKE warning Wiring, terminals or REFER to Section to indicator is always/never on connectors continue diagnosis of the Parking brake switch warning indicator. Brake fluid level switch (part of the master cylinder) Brake fluid level Instrument cluster The stability/traction control DTCs present in the ABS RETRIEVE and RECORD indicator (in the instrument module or PCM any ABS module DTCs. GO cluster) is always/never on PCM to the ABS Module DTC Instrument cluster Chart. If there are no DTCs present in the ABS module, RETRIEVE and RECORD any PCM DTCs. REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. If there are no PCM DTCs, REFER to Diagnosis and Testing in Section The stability/traction control Wiring, terminals or GO to Pinpoint Test Q. OFF indicator (in the switch) connectors is always/never on Stability/traction control switch PCM The stability/traction control NOTE: It is normal for the RETRIEVE and RECORD all indicator (in the instrument indicator to flash during a ABS module DTCs and GO cluster) is flashing at all times traction control event. to the ABS Module DTC ABS module not configured or system not initialized Chart. communication with the Wiring, terminals or REFER to Section to ABS module connectors diagnose the no ABS module communication concern.

14 Vehicle Dynamic Systems Symptom Chart Condition Possible Sources Action The stability/traction control Fuse GO to Pinpoint Test P. system cannot be Wiring, terminals or disabled/enabled connectors Stability/traction control switch PCM The stability/traction control Stability/traction control GO to Pinpoint Test P. system is inoperative system is turned off Stability/traction control system is not configured Fuse Wiring, terminals or connectors ABS wheel speed sensor fault High-speed controller area network (HS-CAN) bus fault PCM ABS false activation, ABS Brake pads ELIMINATE the base brake too sensitive, ABS activates Brake calipers and/or guide system as the cause of the on a normal stop pins problem. REFER to Diagnosis and Testing in Section Parking brake shoes out of CHECK and if necessary, adjustment (dragging) ADJUST the parking brake shoes. REFER to Section Wheel speed sensor tone INSPECT the wheel speed rings sensor tone rings for damaged teeth and excessive air gap. INSTALL new wheel speed sensor rings as necessary. For front tone rings, REFER to Wheel Speed Sensor Ring Front in this section. For rear tone rings, REFER to Wheel Hub Removal and Installation in Section B. Wheel speed sensor GO to Pinpoint Test J. Chafed wheel speed sensor INSPECT the wiring harness wire insulation or pinched from the wheel speed sensor wheel speed sensor wire knuckle to the frame and from the rear axle to the frame. REPAIR as necessary. Open or shorted wheel speed GO to Pinpoint Test I. sensor circuit Vehicle pulls during braking Brake pads DISCONNECT the ABS Brake discs module electrical connector. Brake calipers and/or guide DRIVE the vehicle and pins VERIFY the condition. If the Wheel speed sensor condition is still present, REFER to Section to diagnose the base braking system. If the condition is no longer present, GO to Pinpoint Test J.

15 Vehicle Dynamic Systems Symptom Chart Condition Possible Sources Action Wheels lock up Brake pads ELIMINATE the base brake Brake calipers and/or guide system as the cause of the pins problem. REFER to Diagnosis and Testing in Section Parking brake shoes out of CHECK and if necessary, adjustment (dragging) ADJUST the parking brake shoes. REFER to Section Hydraulic outlet (dump) valve BLEED the HCU. REFER to Leaky inlet (isolation) valve Brake System Bleeding in during ABS (soft) Section TEST the system for normal operation. If the symptom returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. TEST the system for normal operation. Soft/excessive brake pedal Air in brake system ELIMINATE the base brake travel Brake calipers and/or guide system as the cause of the pins problem. REFER to Diagnosis Brake flexible hose and Testing in Section Brake master cylinder Brake pads Brake pedal Inlet (isolation) valve or BLEED the hydraulic control hydraulic outlet (dump) valve unit (HCU). REFER to Brake Leaky inlet (isolation) valve System Bleeding in Section during ABS applications (soft) TEST the system for normal operation. If the symptom returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. TEST the system for normal operation. Pinpoint Tests Pinpoint Test G: DTCs B1317 and B1318 Battery Voltage High/Low Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information. rmal Operation The operating voltage range for the ABS and the roll stability control (RSC) system is volts. A low or weak battery or a weak charging system will cause the DTCs to set. Make sure the battery is operating at a minimum of 10 volts and that the charging system is fully operational.

16 Vehicle Dynamic Systems Fused battery voltage for hydraulic pump motor NOTE: Circuit 494 (TN/LG) passes through the operation is supplied to the ABS module from wire assembly jumper connected to ABS factory test battery junction box (BJB) fuse 11 (40A) along connector C126. If a fault is present on circuit 494 circuit 532 (OG/YE). Fused battery voltage for (TN/LG), make sure to check for an open between hydraulic valve and coil operation is supplied to pin-4 and pin-12 of the wire assembly jumper. ABS test connector C126 from BJB fuse 16 (40A) along circuit 494 (TN/LG), the voltage passes through the test connector and continues to the ABS module along circuit 493 (PK/BK). Fused ignition voltage is supplied to ABS test connector C126 central junction box (CJB) fuse 2 (10A) along circuit 640 (RD/YE), the voltage passes through the test connector and continues to the ABS module along circuit 640 (RD/YE). Ground for the ABS module is provided along circuit 530 (LG/YE). DTC Description Fault Trigger Conditions DTC B1317 Battery Voltage High If the voltage supplied to the ABS module exceeds 16 volts during the ABS module self-test or normal operation, with vehicle speed greater than 5 km/h (3 mph), DTC B1317 will be set. DTC B1318 Battery Voltage Low If the voltage supplied to the ABS module falls below 10 volts during the ABS module self-test or normal operation, with vehicle speed greater than 5 km/h (3 mph), DTC B1318 will be set. DTC C1194 ABS Outlet Valve Coil LF Circuit Failure DTC C1198 ABS Inlet Valve Coil LF Circuit Failure DTC C1210 ABS Outlet Valve Coil RF Circuit Failure DTC C1214 ABS Inlet Valve Coil RF Circuit Failure DTC C1242 ABS Outlet Valve Coil LR Circuit Failure DTC C1246 ABS Outlet Valve Coil RR Circuit Failure DTC C1250 ABS Inlet Valve Coil LR Circuit Failure DTC C1254 ABS Inlet Valve Coil RR Circuit Failure DTC C1404 Traction Control Valve Rear Circuit Failure DTC C1410 Traction Control Valve LF Circuit Failure DTC C1957 Dynamic Stability Control Valve RF Circuit Failure DTC C1958 Dynamic Stability Control Valve LF Circuit Failure If during normal operation or the on-demand self test the ABS module detects an open circuit, short to ground or battery, or a defective trigger circuit, the appropriate DTC will be set. This pinpoint test is intended to diagnose the following: Wiring, terminals or connectors Vehicle charging system ABS module G1 PINPOINT TEST G: DTCs B1317 AND B1318 BATTERY VOLTAGE HIGH/LOW NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes. CHECK FOR RETURNING DTCs Connect the scan tool. Ignition ON. GO to G2.

17 Vehicle Dynamic Systems G1 PINPOINT TEST G: DTCs B1317 AND B1318 BATTERY VOLTAGE HIGH/LOW CHECK FOR RETURNING DTCs G2 G3 Clear the DTCs and carry out the ABS module self-test. Retrieve and record any ABS module DTCs. For all other DTCs, GO to the ABS Do any of the DTCs listed in rmal Operation return? Module DTC Chart. CHECK THE BATTERY VOLTAGE Measure the voltage between the positive and negative battery terminals with the key ON and the engine OFF (KOEO), and GO to G3. with the engine running. Is the battery voltage between 10 and 13 volts with KOEO, INSPECT the ABS module electrical and between 13 and 17 volts with the engine running? connector for corrosion, pushed-out pins and spread terminals. If OK, REFER to Section to continue diagnosis of the charging system. If not OK, REPAIR as necessary. CLEAR the DTCs and CARRY OUT the self-test with the brake pedal not applied. CHECK THE VOLTAGE TO THE ABS TEST CONNECTOR Ignition OFF. Disconnect: ABS Test Connector C126. Ignition ON. Measure the voltage between ground and: ABS test connector C126-4, circuit 494 (TN/LG), harness side. ABS test connector C126-6, circuit 640 (RD/YE), harness side. G4 GO to G4. VERIFY BJB fuse 16 (40A) and CJB fuse 2 (10A) are OK. If OK, REPAIR the affected circuit(s). CLEAR the DTCs. Are the voltages greater 10 volts? REPEAT the self-test. CHECK THE VOLTAGE TO THE ABS MODULE NOTE: Circuits 494 (TN/LG) and 640 (RD/YE) pass through the jumper harness connected to ABS test connector C126. If there is a fault in one or both of these circuits, check the jumper harness for an open. Ignition OFF. Connect: ABS Test Connector C126. Disconnect: ABS Module C155. Ignition ON.

18 Vehicle Dynamic Systems G4 PINPOINT TEST G: DTCs B1317 AND B1318 BATTERY VOLTAGE HIGH/LOW CHECK THE VOLTAGE TO THE ABS MODULE Measure the voltage between ground and: ABS module C155-2, circuit 493 (PK/BK), harness side. ABS module C155-31, circuit 532 (OG/YE), harness side. ABS module C155-32, circuit 640 (RD/YE), harness side. G5 GO to G5. If the voltages at pin-2 and/or pin-32 are not greater than 10 volts, VERIFY the jumper harness for the ABS test connector is OK. If OK, REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. If the voltage at pin-31 is not greater than 10 volts, VERIFY BJB fuse 11 (40A) is OK. If OK, REPAIR circuit 532 (OG/YE). Are the voltages greater than 10 volts? CLEAR the DTCs. REPEAT the self-test. CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN Ignition OFF. Measure the resistance between ground and: ABS module C155-16, circuit 530 (LG/YE), harness side. ABS module C155-45, circuit 530 (LG/YE), harness side. G6 GO to G6. REPAIR circuit 530 (LG/YE). CLEAR the Are the resistances less than 5 ohms? DTCs. REPEAT the self-test. CHECK FOR CORRECT ABS MODULE OPERATION Check ABS module C155 for: corrosion. INSTALL a new ABS module. REFER to pushed-out pins. Anti-Lock Brake System (ABS) Module in spread terminals. this section. Using the scan tool, CARRY Connect: ABS Module C155. OUT the IVD Initialization sequence. Make sure the connector is fully seated and locked, then CLEAR the DTCs. CARRY OUT the operate the system and verify the concern is still present. self-test with the brake pedal not applied. Is the concern still present? The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector or a malfunctioning charging system. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

19 Vehicle Dynamic Systems Pinpoint Test H: DTCs C1095 and C1096 ABS Hydraulic Pump Motor Circuit Failure/Open Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information. rmal Operation Fused battery voltage for hydraulic pump motor operation is supplied to the ABS module by battery junction box (BJB) fuse 11 (40A) along circuit 532 (OG/YE). Ground is provided to the ABS module along circuit 530 (LG/YE). When the ignition key is turned to the ON position, the ABS module commands the hydraulic control unit (HCU) pump on for 100 ms (+/-6 ms) and is then commanded off. After 6 ms, the ABS module will read the voltage that is being generated by the HCU pump. If the voltage indicates the motor is spinning at less than 500 rpm, there may be a locked motor. If this condition is detected 4 times, DTC C1095 is set. The pump motor is checked for an open circuit 2 seconds after the most recent successful pump motor off command. If the pump motor feedback remains greater than 0.75 volt for more than 50 ms (+/-6 ms) after these conditions have been met, DTC C1096 is set. DTC C1095 ABS Hydraulic Pump Motor Circuit Failure If a short to voltage or ground is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1095 will be set. DTC C1096 ABS Hydraulic Pump Motor Circuit Open If a short to voltage, a short to ground or an open is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1095 will be set. This pinpoint test is intended to diagnose the following: Fuse Wiring, terminals or connectors Hydraulic pump motor ABS module H1 PINPOINT TEST H: DTCs C1095 AND C1096 ABS HYDRAULIC PUMP MOTOR CIRCUIT FAILURE/OPEN NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes. CHECK FOR ABS MODULE DTCs Connect the scan tool. Ignition ON. Using the scan tool, clear all ABS module DTCs. Ignition OFF. Ignition ON. Enter the following diagnostic mode on the scan tool: Self Test GO to H2. ABS Module. Retrieve and record all ABS module DTCs. For all other DTCs, GO to the ABS Are DTCs C1095 or C1096 present? Module DTC Chart.

20 Vehicle Dynamic Systems H2 H3 H4 PINPOINT TEST H: DTCs C1095 AND C1096 ABS HYDRAULIC PUMP MOTOR CIRCUIT FAILURE/OPEN CHECK THE ABS PUMP MOTOR Ignition ON. Is the ABS pump motor running all the time? INSTALL a new ABS module and hydraulic control unit (HCU). REFER to Anti-Lock Brake System (ABS) Module and Hydraulic Control Unit (HCU) in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. REPEAT the self-test. GO to H3. CHECK FOR RETURNING ABS MODULE DTCs Connect the scan tool. Ignition ON. If DTC C1096 is retrieved, GO to H6. Enter the following diagnostic mode on the scan tool: ABS If DTC C1095 is retrieved, GO to H4. Module DTCs. Retrieve and record the ABS module DTCs. For all other ABS module DTCs, GO to Are any DTCs present? the ABS Module DTC Chart. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. CHECK THE VOLTAGE TO THE ABS MODULE Ignition OFF. Disconnect: ABS Module C155. Ignition ON. Measure the voltage between ABS module C155-31, circuit 532 (OG/YE), harness side and ground. H5 GO to H5. VERIFY BJB fuse 11 (40A) is OK. If OK, REPAIR circuit 532 (OG/YE). CLEAR the Is the voltage greater than 10 volts? DTCs. REPEAT the self-test. CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN Ignition OFF.

21 Vehicle Dynamic Systems H5 PINPOINT TEST H: DTCs C1095 AND C1096 ABS HYDRAULIC PUMP MOTOR CIRCUIT FAILURE/OPEN CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN Measure the resistance between ground and: ABS module C155-16, circuit 530 (LG/YE), harness side. ABS module C155-45, circuit 530 (LG/YE), harness side. H6 INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) in this section. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. REPEAT the self-test. If DTC C1045 returns, GO to H6. REPAIR circuit 530 (LG/YE). CLEAR the Are the resistances less than 5 ohms? DTCs. REPEAT the self-test. CHECK FOR CORRECT ABS MODULE OPERATION Check ABS module C155 for: corrosion. INSTALL a new ABS module. REFER to pushed-out pins. Anti-Lock Brake System (ABS) Module in spread terminals. this section. Using the scan tool, CARRY Connect: ABS Module C155. OUT the IVD Initialization sequence. Make sure the connector is fully seated and locked, then CLEAR the DTCs. CARRY OUT the operate the system and verify the concern is still present. self-test with the brake pedal not applied. Is the concern still present? The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector or a malfunctioning charging system. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied. Pinpoint Test I: ABS False Activation, ABS Wheel speed sensor DTCs will automatically clear too Sensitive, ABS Activates On a rmal when a successful test drive is carried out. A Stop successful test drive should include speeds above 32 rmal Operation km/h (20 mph) and at least one ABS stop. The wheel speed sensors are active sensors and generate a square wave signal that is sent to the ABS module. When the ignition is turned to the RUN position, the ABS module carries out a self-test to determine if the sensors are functional. Voltage and ground are supplied to the front wheel speed sensors from the ABS module along a pair of wires.

22 Vehicle Dynamic Systems DTC Description DTC C1145 RF Wheel Speed Sensor Input Circuit Failure DTC C1155 LF Wheel Speed Sensor Input Circuit Failure DTC C1165 RR Wheel Speed Sensor Input Circuit Failure DTC C1175 LR Wheel Speed Sensor Input Circuit Failure Fault Trigger Condition If during the ABS module on-demand self test or during normal operation, if the ABS module detects an open, short to ground or voltage or a defective wheel speed sensor input circuit, the appropriate DTC will be set. These DTCs are usually set by a damaged sensor or a circuit fault. This pinpoint test is intended to diagnose the following: Wiring, terminals or connectors Wheel speed sensor ring Wheel speed sensor ABS module PINPOINT TEST I: ABS FALSE ACTIVATION, ABS TOO SENSITIVE, ABS ACTIVATES ON A NORMAL STOP I1 I2 I3 NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes. CHECK THE ABS HARNESS AND MODULE FOR WATER INTRUSION Ignition OFF. Disconnect: ABS Module C155. CLEAN the connector and dry it out with Inspect the ABS module connector and module for water low pressure compressed air. INSPECT intrusion. for evidence of water entry and REPAIR Is there any evidence of water entry? as necessary. Using the scan tool, CARRY OUT the IVD Initialization sequence. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop. GO to I2. CHECK FOR FAULT REPEATABILITY Connect the scan tool. Ignition ON. For DTC C1145 or C1155, GO to I5. For Enter the following diagnostic mode on the scan tool: Clear the DTC C1165 or C1175, if the active wheel Continuous DTCs. speed sensor tool is available, GO to I3. Drive the vehicle at least 16 km/h (10 mph). If the active wheel speed sensor tool is Retrieve and document continuous DTCs. not available, GO to I5. Is DTC C1145, C1155, C1165 and/or C1175 retrieved? INSPECT the wheel speed sensors, wheel speed sensor wiring and wheel speed sensor tone rings. REPAIR or INSTALL new as necessary. If any other DTCs are retrieved, GO to the ABS Module DTC Chart. CHECK THE ABS MODULE OUTPUT USING THE SPECIAL TOOL Ignition OFF. Disconnect: Suspect Wheel Speed Sensor. Connect the special tool to the wheel speed sensor connectors. Ignition ON. Select the correct system polarity on the special tool and turn GO to I4. the special tool power switch to the ON position. Is the module output LED illuminated? GO to I7.