DIAGNOSIS AND TESTING

Transcription

1 Wheels and Tires DIAGNOSIS AND TESTING Tire Pressure Monitoring System Special Tool(s) Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Activation Tool, Tire Pressure Monitor Digital Tire Gauge Ambient Temperature Change and Tire Pressure CAUTION: Do not inflate tire higher than maximum pressure stamped on tire sidewall. Tire pressures fluctuate with temperature changes. For this reason, tire pressure must be set to specification when tires are at outdoor ambient temperatures. If the vehicle is allowed to warm up to shop temperatures, and the outside temperature is less than shop temperature, the tire inflation pressure must be adjusted accordingly. If the tires are inflated to specification at shop temperatures and the vehicle is moved outdoors when the outdoor ambient temperature is significantly lower, the tire pressure may drop enough to be detected by the TPMS and activate the TPMS warning lamp. Principles of Operation The tire pressure monitoring system (TPMS) monitors the air pressure of all 4 road tires. The wheel-mounted tire pressure sensors transmit via radio frequency (RF) signals, to the smart junction box (SJB). TPMS functionality is integral to the SJB. These transmissions are sent approximately every 60 seconds when the vehicle speed exceeds 32 km/h (20 mph). The TPMS function compares each tire pressure sensor transmission against a low-pressure limit. If it has been determined that the tire pressure has fallen below this limit, the SJB communicates this on the vehicle communication bus to the instrument cluster. The instrument cluster then illuminates the TPMS indicator and displays the appropriate message(s) in the message center (if equipped). The system is not affected by wheel and tire rotation. Copyright 2006, Ford Motor Company Last updated: 6/19/2006

2 Wheels and Tires As the ambient temperature decreases by 6 C (10 F), tire pressure decreases 7 kpa (1 psi). Adjust the tire pressure by 7 kpa (1 psi) for each 6 C (10 F) ambient temperature drop as necessary to keep the tire at the specified vehicle certification label pressure. Refer to the following tables to adjust the tire pressure indoors for colder outside temperatures.

3 Wheels and Tires TPMS Indicator and Message Center 1. Tire Pressure Sensor Fault If equipped, the Messages message center will display TIRE SENSOR The TPMS indicator and vehicle message center (if FAULT when a tire pressure sensor is equipped) sometimes displays faults that cannot be malfunctioning. GO to Symptom Chart. resolved by the customer. Treat these messages as 2. No communication with the SJB (TPMS is TPMS faults that must be serviced. integral to the SJB) The TPMS indicator is TPMS Indicator Illuminates Continuously illuminated when the instrument cluster has received no signals from the SJB for more than NOTE: If the spare tire is in use, the damaged road 5 seconds. If equipped, the message center tire must be repaired and installed on the vehicle to displays TIRE MONITOR FAULT. GO to restore complete TPMS functionality before carrying Symptom Chart. out any diagnosis. 3. Tire Pressure Monitor Fault If equipped, the 1. The TPMS indicator remains on continuously message center will display TIRE MONITOR for the following condition: FAULT when the tire pressure monitoring system is malfunctioning or communication Low Tire Pressure The TPMS indicator with the instrument cluster has been lost. GO is illuminated solid and the message center to Symptom Chart. displays LOW TIRE PRESSURE (if equipped). This is displayed when any of Inspection and Verification the tire pressures are low. When this 1. NOTE: The tire pressure sensors are not condition exists, the tire pressure must be designed to be used with aftermarket wheels. adjusted to the recommended cold pressure as indicated on the vehicle certification NOTE: The use of run-flat tires (tires with label. steel body cord plies in the tire sidewall) where not originally equipped, may cause the TPMS 2. NOTE: The TPMS sensors do not transmit system to malfunction and is therefore not when the vehicle is stationary. If the vehicle recommended. has been stationary for more than 30 minutes, it will be necessary to wake up the sensors so Verify the customer concern by inspecting the they will transmit the latest tire pressure vehicle and observing the message center (if information to the SJB. equipped) and the TPMS indicator. If the vehicle has been stationary for more than 2. NOTE: The valve-mounted TPMS sensors and 30 minutes, carry out the following procedure the strap-mounted TPMS sensors are not to wake up the TPMS sensors. compatible. Swapping wheels from one vehicle to another with the different systems will 1 Turn the ignition switch to the ON position. adversely affect TPMS operation. 2 Adjust the air pressure in the LF tire. NOTE: Non-original equipment manufacturer 3 Activate the LF TPMS sensor, at least 2 (OEM) modifications made to the vehicle may times, using the tire pressure monitor result in false TPMS warnings. activation tool. Inspect to determine if one of the following 4 Repeat Steps 2 and 3 for the remaining mechanical or electrical concerns apply: tires. 5 If the TPMS indicator remains illuminated after adjusting and activating each sensor, GO to Symptom Chart. TPMS Indicator Flashes The TPMS indicator flashes for 70 seconds and then remains ON solid when the ignition key is turned to the ON position for the following conditions:

4 Wheels and Tires Visual Inspection Chart check the scan tool connection to the VCM. Mechanical Electrical refer to Section , No Power To The Low tire pressure Circuitry Scan Tool, to diagnose no communication TPMS sensor damaged Electrical connectors with the scan tool. or missing SJB missing or Spare tire installed as a damaged 6. If the scan tool does not communicate with the road wheel vehicle: Incorrect TPMS sensor verify the ignition key is in the ON position. installed TPMS sensor installed verify the scan tool operation with a known incorrectly good vehicle. Non-OEM wheels installed (aftermarket refer to Section to diagnose no rims) response from the powertrain control module Non-OEM equipped (PCM). run-flat tires installed 7. Carry out the network test. Other non-oem modifications (roll If the scan tool responds with no cages, service barriers, communication for one or more modules, part racks, ladder racks) refer to Section If the network test passes, retrieve and 3. If an obvious cause for an observed or reported record continuous memory diagnostic concern is found, correct the cause (if possible) trouble codes (DTCs). before proceeding to the next step. 8. Clear the continuous DTCs and carry out the 4. NOTE: Make sure to use the latest scan tool self-test diagnostics for the TPMS module. software release. 9. If the DTCs retrieved are related to the concern, If the cause is not visually evident, connect the go to the Tire Pressure Monitor System (TPMS) scan tool to the data link connector (DLC). Module Diagnostic Trouble Code (DTC) Chart. 5. NOTE: The vehicle communication module For all other DTCs, refer to Section (VCM) LED prove out confirms power and 10. If no DTCs related to the concern are retrieved, ground from the DLC are provided to the GO to Symptom Chart. VCM. Tire Pressure Monitor System (TPMS) If the scan tool does not communicate with the Diagnostic Trouble Code (DTC) Chart VCM: check the VCM connection to the vehicle. Tire Pressure Monitor System (TPMS) Diagnostic Trouble Code (DTC) Chart DTC Description Source Action B1342 ECU is Defective SJB INSTALL a smart junction box (SJB). REFER to Section B2872 Tire Pressure Sensor Fault SJB GO to Pinpoint Test C. Tire Pressure Monitor System (TPMS) Module Replacement Diagnostic Trouble Code (DTC) Chart Tire Pressure Monitor System (TPMS) Module Replacement Diagnostic Trouble Code (DTC) Chart DTC Description Source Action B106A Pressure Sensor Range Bit Incorrect State SJB GO to Pinpoint Test D. B106B Tire Pressure Sensor Low Battery (Could SJB GO to Pinpoint Test E. be set configuring new SJB)

5 Wheels and Tires Tire Pressure Monitor System (TPMS) Module Replacement Diagnostic Trouble Code (DTC) Chart (Continued) DTC Description Source Action B2477 Module Configuration Failure/Mismatch SJB DTC B2477 is only present when a new SJB is installed, the SJB is incorrectly flashed or the SJB is incorrectly configured. Successfully configuring the SJB is the only way to clear this DTC. Make sure the SJB is configured correctly. If the DTC B2477 is still present, REFER to Section B2868 Left Front Tire Pressure Sensor Fault SJB DTC B2868 is only present when a new SJB is installed, the SJB is flashed or the SJB is reconfigured. REFER to Section , follow all SJB removal and installation steps. B2869 Right Front Tire Pressure Sensor Fault SJB DTC B2869 is only present when a new SJB is installed, the SJB is flashed or the SJB is reconfigured. REFER to Section , follow all SJB removal and installation steps. B2870 Right Rear Tire Pressure Sensor Fault SJB DTC B2870 is only present when a new SJB is installed, the SJB is flashed or the SJB is reconfigured. REFER to Section , follow all SJB removal and installation steps. B2871 Left Rear Tire Pressure Sensor Fault SJB DTC B2871 is only present when a new SJB is installed, the SJB is flashed or the SJB is reconfigured. REFER to Section , follow all SJB removal and installation steps. C2780 ECU in Manufacturing Mode SJB DTC C2780 is only present when a new SJB is installed, the SJB is flashed or the SJB is reconfigured. REFER to Section , follow all SJB removal and installation steps. Symptom Chart NOTE: TPMS is not affected by wheel and tire rotation. Failure of a TPMS component may not cause the message center to display a fault message or a DTC to be stored. The Symptom Chart is a starting point to begin diagnosis of these concerns. Symptom Chart Condition Possible Sources Action TPMS indicator ON Air pressure not set to GO to Pinpoint Test A. continuously and message specifications listed on the center (if equipped) displays vehicle certification label LOW TIRE PRESSURE Message center (if equipped) Spare tire currently in use INSTALL the repaired road displays LOW TIRE wheel/tire in place of the PRESSURE spare tire.

6 Wheels and Tires Symptom Chart (Continued) Condition Possible Sources Action SJB will not enter sensor Brake on/off (BOO) switch GO to Pinpoint Test B. training mode Ignition switch Vehicle communication bus ABS/TC/IVD module Smart junction box (SJB) TPMS indicator FLASHES TPMS sensor(s) GO to Pinpoint Test C. for 70 seconds and then TPMS sensor(s) not trained to remains ON solid when the the SJB ignition key is turned to the SJB ON position and DTC B2872 is present TPMS indicator FLASHES SJB REFER to Section for 70 seconds and then remains ON solid when the ignition key is turned to the ON position, the message center (if equipped) displays TIRE MONITOR FAULT and DTC B1342 is present TPMS indicator FLASHES Vehicle communication bus REFER to Section for 70 seconds and then SJB remains ON solid when the ignition key is turned to the ON position, the message center (if equipped) displays TIRE MONITOR FAULT and there are no DTCs present in the SJB Vehicle communication issue REFER to Section between SJB and instrument cluster Pinpoint Tests Pinpoint Test A: TPMS Indicator ON Continuously and Message Center (if Equipped) Displays LOW TIRE PRESSURE Normal Operation The tire pressure monitoring system (TPMS) monitors the air pressure of all 4 road tires. The wheel-mounted tire pressure sensors transmit via radio frequency (RF) signals, to the smart junction box (SJB). TPMS functionality is integral to the SJB. These transmissions are sent approximately every 60 seconds when the vehicle speed exceeds 32 km/h (20 mph). The TPMS function (integral to the SJB) compares each tire pressure sensor transmission against a low-pressure limit. If it has been determined that the tire pressure has fallen below this limit, the SJB communicates this on the vehicle communication bus to the instrument cluster. The instrument cluster then illuminates the TPMS indicator and displays the appropriate message(s) in the message center (if equipped). Possible Causes Low air pressure in tire(s) Tire pressure sensor(s)

7 Wheels and Tires PINPOINT TEST A: TPMS INDICATOR ON CONTINUOUSLY AND MESSAGE CENTER (IF EQUIPPED) DISPLAYS LOW TIRE PRESSURE A1 A2 CAUTION: Use only special tool any time tire pressures are measured to be sure that accurate values are obtained. NOTE: If a warranty case is opened for an actual TPMS fault, document and include the actual tire pressure data in all warranty communications. CHECK THE TIRE PRESSURE Measure and record the air pressure in all 4 road tires. Adjust the air pressure for those found to be below the Yes specification listed on the vehicle certification label. The system is functioning normally, NOTE: If the vehicle has been stationary for more than 30 diagnosis is complete. INFORM the minutes, activate each TPMS sensor at least 2 times with the customer of correct tire pressure tire pressure monitor activation tool. The TPMS sensor does not maintenance as instructed in the transmit when the vehicle is stationary. scheduled maintenance guide and the Verify system operation. owner guide. Have the TPMS indicator and the message center (if No equipped) warnings gone out? GO to A2. CHECK THE SYSTEM COMPONENTS Train all 4 tire pressure sensors. Refer to Tire Pressure Yes Monitoring System (TPMS) Sensor Training in this section. The system is functioning normally, Using the scan tool, read and record the tire pressures: diagnosis complete. LF PRES, RF PRES, RR PRES and LR PRES. No Compare the air pressure readings recorded from the function Before installing a new sensor(s): If a test to those recorded in A1. sensor(s) does not respond to the special Do the compared tire pressure values match within ±5 psi, tool, ATTEMPT to activate the same and have the TPMS indicator and the message center (if sensor(s) with the special tool. If the equipped) warnings gone out? sensor(s) still does not respond, MOVE the vehicle to rotate the wheels at least 1/4 of a turn and ATTEMPT to activate the same sensor(s) again. INSTALL new tire pressure sensors for those with discrepancies. REFER to Tire Pressure Monitoring System (TPMS) Sensor in this section. CLEAR the DTCs. REPEAT the self-test. Pinpoint Test B: SJB Will Not Enter Sensor Training Mode Normal Operation For the smart junction box (SJB) to enter tire pressure monitoring system (TPMS) sensor training mode, the SJB must receive valid input from the brake pedal position switch and ignition switch, and it must receive valid vehicle speed sensor input from the ABS/TC/IVD module. Possible Causes Circuit open Circuit shorted Brake on/off (BOO) switch Ignition switch ABS/TC/IVD module Smart junction box (SJB) B1 PINPOINT TEST B: SJB WILL NOT ENTER SENSOR TRAINING MODE CHECK THE BRAKE PEDAL POSITION (BPP)/BRAKE ON/OFF (BOO) SWITCH Using the scan tool, monitor the SJB BPP/BOO switch PID (SJB reads the brake switch directly). Yes Press and release the brake pedal while monitoring the PID. GO to B2. Do the brake pedal PID values match the brake pedal No positions? REFER to Section (Continued)

8 Wheels and Tires B2 B3 PINPOINT TEST B: SJB WILL NOT ENTER SENSOR TRAINING MODE (Continued) CHECK THE IGNITION SWITCH Using the scan tool, monitor the SJB ignition switch status PID. Cycle the ignition switch to the ON and OFF position while Yes monitoring the PID (SJB reads the ignition switch directly). GO to B3. Do the ignition switch status PID values match the ignition No switch positions? REFER to Section CHECK THE VEHICLE SPEED INPUT TO THE SJB Using the scan tool, monitor the SJB vehicle speed PID (SJB Yes receives vehicle speed from the ABS/TC/IVD module). REFER to Section Does the vehicle speed PID value match the speed of the No vehicle? REFER to Section Pinpoint Test C: TPMS Indicator FLASHES For 70 Seconds and Then Remains ON Solid When the Ignition Key is Turned to the ON Position and DTC B2872 is Present Normal Operation If there is a fault in the tire pressure monitor system (TPMS), such as a damaged or missing sensor(s), damaged module or a communication issue within the vehicle, diagnostic trouble codes (DTCs) are set in the smart junction box (SJB), the TPMS warning indicator will flash for 70 seconds and then remain ON solid when the ignition switch is turned to the ON position and the message center (if equipped) will display TIRE PRESSURE SENSOR FAULT. Possible Causes TPMS sensor(s) missing TPMS sensor(s) not trained to the vehicle TPMS sensor(s) swapped due to wheel swap TPMS sensor(s) damaged Vehicle communication issue SJB PINPOINT TEST C: TPMS INDICATOR FLASHES FOR 70 SECONDS AND THEN REMAINS ON SOLID WHEN THE IGNITION KEY IS TURNED TO THE ON POSITION AND DTC B2872 IS PRESENT C1 C2 NOTE: If a warranty case is opened for an actual TPMS fault, document and include the actual tire pressure data in all warranty communications. CHECK FOR DTCs Connect the scan tool. Using the scan tool, read the TPMS sensor IDs currently trained to the SJB. Yes Record the sensor IDs. GO to C2. Using the scan tool, read the TPMS System Status: TP STAT. No Is the TPMS system status (TP STAT) equal to $02 If the TPMS system status is equal to $01 SENSOR FAULT? SYSTEM FAULT, GO to C4. CHECK THE TIRE PRESSURE SENSOR RESPONSE TO THE TRAINING TOOL Activate a sensor by positioning the tire pressure monitor activation tool against the tire sidewall 180 degrees from the tire valve stem. Press the test button on the special tool. NOTE: The special tool will provide feedback in the form of a flashing green light and a beep sound for each successful Yes response from a tire pressure sensor. GO to C3. Activate the 3 remaining sensors. No Did all tire pressure sensors respond back to the training The sensor(s) that did not respond to the tool? tool could be the cause. GO to C3. (Continued)

9 Wheels and Tires PINPOINT TEST C: TPMS INDICATOR FLASHES FOR 70 SECONDS AND THEN REMAINS ON SOLID WHEN THE IGNITION KEY IS TURNED TO THE ON POSITION AND DTC B2872 IS PRESENT (Continued) C3 C4 CARRY OUT THE SENSOR TRAINING PROCEDURE Train all 4 tire pressure sensors. Refer to Tire Pressure Yes Monitoring System (TPMS) Sensor Training in this section. Using the scan tool, locate the updated Did all of the tire pressure sensors transmit correctly and TPMS sensor IDs trained to the SJB did the horn sound when each tire pressure sensor module. transmitted to the SJB? COMPARE these values to those recorded prior to the TPMS sensor training procedure. Disregarding sensor position (the system is not affected by tire rotation), any sensor IDs that do not match those retrieved from the module were changed but not retrained. The sensors are now trained to the vehicle, diagnosis is complete. DOCUMENT all TPMS sensor IDs on the applicable warranty claim. No Before installing a new sensor(s): If a sensor(s) does not respond to the special tool, ATTEMPT to activate the same sensor(s) with the special tool. If the sensor(s) still does not respond, MOVE the vehicle to rotate the wheels at least 1/4 of a turn and ATTEMPT to activate the same sensor(s) again. If the sensor(s) fail to train a second time, INSTALL a new tire pressure sensor(s). REFER to Tire Pressure Monitoring System (TPMS) Sensor. CLEAR the DTCs. REPEAT the self-test. TPMS SYSTEM STATUS EQUALS $01 SYSTEM FAULT Train all 4 tire pressure sensors. Refer to Tire Pressure Yes Monitoring System (TPMS) Sensor Training in this section. Using the scan tool, locate the updated Did all of the tire pressure sensors transmit correctly and TPMS sensor IDs trained to the SJB did the horn sound when each tire pressure sensor module. transmitted to the SJB? COMPARE these values to those recorded prior to the TPMS sensor training procedure. Disregarding sensor position (the system is not affected by tire rotation), any sensor IDs that do not match those retrieved from the module were changed but not retrained. The sensors are now trained to the vehicle, diagnosis is complete. DOCUMENT all TPMS sensor IDs on the applicable warranty claim. No Before diagnosing the SJB: If a sensor(s) does not respond to the special tool, ATTEMPT to activate the same sensor(s) with the special tool. If the sensor(s) still does not respond, MOVE the vehicle to rotate the wheels at least 1/4 of a turn and ATTEMPT to activate the same sensor(s) again. If the sensor(s) fail to train a second time, REFER to Section for SJB and SJB antenna diagnosis.

10 Wheels and Tires Pinpoint Test D: DTC B106A Pressure Sensor Range Bit Incorrect State Normal Operation If there is a fault in the tire pressure monitoring system (TPMS), such as a damaged or missing sensor(s), damaged module or a communication issue within the vehicle, DTCs are set in the smart junction box (SJB), the TPMS warning indicator will flash for 70 seconds and then remain ON solid when the ignition switch is turned to the ON position and the message center (if equipped) will display TIRE PRESSURE SENSOR FAULT. This DTC may be encountered if a high-pressure sensor (designed for trucks with much higher tire pressures and molded in green plastic) was installed. The SJB will only allow a low-pressure sensor (molded in blue plastic) to be trained using the TPMS sensor training procedure. Make sure the correct sensors are used to avoid compatibility issues. Possible Causes Tire pressure sensor(s) Incorrect tire pressure sensor(s) installed SJB D1 PINPOINT TEST D: DTC B106A PRESSURE SENSOR RANGE BIT INCORRECT STATE DETERMINE IF THE VEHICLE IS EQUIPPED WITH AN INCORRECT SENSOR Train all 4 tire pressure sensors. Refer to Tire Pressure Yes Monitoring System (TPMS) Sensor Training in this section. CLEAR the DTCs. REPEAT the self-test. Did all of the tire pressure sensors transmit correctly and did the horn sound when each tire pressure sensor No transmitted to the SJB? Before installing a new sensor(s): If a sensor(s) does not respond to the special tool, ATTEMPT to activate the same sensor(s) with the special tool. If the sensor(s) still does not respond, MOVE the vehicle to rotate the wheels at least 1/4 of a turn and ATTEMPT to activate the same sensor(s) again. If the sensor(s) fail to train a second time, INSTALL a new tire pressure sensor(s). REFER to Tire Pressure Monitoring System (TPMS) Sensor. CLEAR the DTCs. REPEAT the self-test. Pinpoint Test E: DTC B106B Tire Pressure Sensor Low Battery Normal Operation If there is a fault in the tire pressure monitoring system (TPMS), such as a damaged or missing sensor(s), damaged module or a communication issue within the vehicle, DTCs are set in the smart junction box (SJB), the TPMS warning indicator will flash for 70 seconds and then remain ON solid when the ignition switch is turned to the ON position and the message center (if equipped) will display TIRE PRESSURE SENSOR FAULT. The tire pressure sensor is battery powered. This DTC may be set when attempting to train a tire pressure sensor(s) with a low battery. Possible Causes Tire pressure sensor battery Tire pressure sensor(s) SJB

11 Wheels and Tires E1 PINPOINT TEST E: DTC B106B TIRE PRESSURE SENSOR LOW BATTERY DETERMINE WHICH SENSOR HAS A LOW BATTERY Train all 4 tire pressure sensors. Refer to Tire Pressure Yes Monitoring System (TPMS) Sensor Training in this section. CLEAR the DTCs. REPEAT the self-test. Did all of the tire pressure sensors transmit correctly and did the horn sound when each tire pressure sensor No transmitted to the SJB? Before installing a new sensor(s): If a sensor(s) does not respond to the special tool, ATTEMPT to activate the same sensor(s) with the special tool. If the sensor(s) still does not respond, MOVE the vehicle to rotate the wheels at least 1/4 of a turn and ATTEMPT to activate the same sensor(s) again. If the sensor(s) fail to train a second time, INSTALL a new tire pressure sensor(s). REFER to Tire Pressure Monitoring System (TPMS) Sensor. CLEAR the DTCs. REPEAT the self-test.