SUPPLEMENTAL RESTRAINT SYSTEM (SRS) (If steering maintenance is required)

Transcription

1 06/09/19 11:30:15 61SNC010_170_0001 SUPPLEMENTL RESTRINT SYSTEM (SRS) (If steering maintenance is required) The Civic Hybrid SRS includes a driver s airbag in the steering wheel hub, a passenger s airbag in the dashboard above the glove box, seat belt tensioners in the front seat belt retractors, seat belt buckle tensioners in the front seat belt buckles, side curtain airbags in the sides of the roof, and side airbags in the front seat-backs. Information necessary to safely service the SRS is included in this Service Manual. Items marked with an asterisk ( ) on the contents page include or are located near SRS components. Servicing, disassembling, or replacing these items requires special precautions and tools, and should be done only by an authorized Honda dealer. To avoid rendering the SRS inoperative, which could lead to personal injury or death in the event of a severe frontal or side collision, all SRS service work should be done by an authorized Honda dealer. Improper service procedures, including incorrect removal and installation of the SRS, could lead to personal injury caused by unintentional deployment of the airbags and/or side airbags. Do not bump or impact the SRS unit, front impact sensors, or side impact sensors when the ignition switch is ON (II), or for at least 3 minutes after the ignition switch is turned OFF; otherwise, the system may fail in a collision, or the airbags may deploy. SRS electrical connectors are identified by yellow color coding. Related components are located in the steering column, front console, dashboard, dashboard lower panel, in the dashboard above the glove box, in the front seats, in the roof side, and around the floor. Do not use electrical test equipment on these circuits.

2 06/09/19 11:30:15 61SNC010_170_0002 Steering Steering Special Tools Component Location Index Steering Wheel Rotational Play Check Power ssist Check Steering Linkage and Gearbox Inspection Steering Wheel Removal Steering Wheel Disassembly/Reassembly Steering Wheel Installation Column Cover Removal and Installation Steering Column Removal and Installation Steering Column/Tilt/Telescopic Inspection Steering Lock Replacement Rack Guide djustment EPS (Electrical Power Steering) Components

3 06/09/19 11:30:15 61SNC010_170_0003 Steering Special Tools Ref. No. Tool Number Description Qty 07K-SN120 Universal Eyelet 1 07JF-SH20330 ushing ase 1 07M-SL0020 Locknut Wrench, 43 mm 1 07MC-SL0202 all Joint Remover, 28 mm

4 06/09/19 11:30:17 61SNC010_170_0004 Component Location Index DRIVER S IRG Replacement, page STEERING WHEEL Removal, page 17-6 Disassembly/Reassembly, page 17-7 Installation, page 17-8 STEERING COLUMN Column Cover Removal and Installation, page 17-9 Removal and Installation, page Streering Column/Tilt/Telescopic Inspection, page Steering Lock Replacement, page POWER STEERING GEROX Rack Guide djustment, page EPS Component Location Index, page

5 06/09/19 11:30:18 61SNC010_170_0005 Steering Steering Wheel Rotational Play Check 1. Turn the front wheels to the straight ahead position. 2. Measure how far you can turn the steering wheel left and right without moving the front wheels. If the play is within the limit, the gearbox and linkage are OK. If the play exceeds the limit, adjust the rack guide (see page 17-14). If the play is still excessive after rack guide adjustment, inspect the steering linkage and gearbox (see page 17-5). Power ssist Check NOTE: This test should be done with original equipment tires and wheels at the correct tire pressure. 1. Start the engine, and let it idle. 2. ttach a commercially available spring scale to the steering wheel. With the engine idling and the vehicle on a clean, dry floor, pull the scale as shown, and read it as soon as the tires begin to turn. Rotational play: 0 10 mm ( in.) 3. Ifthescalereadsnomorethan34N(3.5kgf,7.7lbf), the power assist is OK. If it reads more, check these items: Steering linkage (see page 17-5) Rack guide adjustment (see page 17-14) EPS system (see page 17-17) 17-4

6 06/09/19 11:30:18 61SNC010_170_0006 Steering Linkage and Gearbox Inspection STEERING COLUMN Inspect for loose mounting hardware. OOT Inspect for damage and deterioration. STEERING JOINTS Check for a loose joint bolt, or faulty movement. TIE-ROD END LL JOINT Inspect for faulty movement and damage. STEERING GEROX Inspect for loose mounting hardware. GEROX MOUNT CUSHIONS Inspect for deterioration. LL JOINT OOT Inspect for damage and deterioration. TIE-ROD LOCKNUT Check for loose locknut. 17-5

7 06/09/19 11:30:18 61SNC010_170_0007 Steering Steering Wheel Removal SRS components are located in this area. Review the SRS component locations (see page 24-11) and the precautions and procedures (see page 24-13) before Doing repairs or service. 1. Make sure you have the anti-theft codes for the audio or navigation system, then write down the audio presets. 2. Make sure the ignition switch is OFF, then disconnect the negative cable from the battery. 3. lign the front wheels straight ahead, then remove the driver s airbag from the steering wheel (see page ). 4. Disconnect the cable reel subharness connector (). 6. Install a commercially available steering wheel puller () on the steering wheel (). Free the steering wheel from the steering column shaft by turning the pressure bolt (C) of the puller. Note these items when removing the steering wheel: Do not tap on the steering wheel or the steering column shaft when removing the steering wheel. If you thread the puller bolts (D) into the wheel hub more than five threads, the bolts will hit the cable reel and damage it. To prevent this, install a pair of jam nuts five threads up on each puller bolt. D C 5. Loosen the steering wheel bolt (). 7. Remove the steering wheel puller, then remove the steering wheel bolt and steering wheel from the steering column. 17-6

8 06/09/19 11:30:19 61SNC010_170_0008 Steering Wheel Disassembly/Reassembly UDIO REMOTE SWITCH CRUISE CONTROL COMINTION SWITCH STEERING WHEEL VOICE CONTROL SWITCH (With Navigation) STEERING WHEEL RER COVER STEERING WHEEL TRIM CORD GUIDE CCESS PNEL 17-7

9 06/09/19 11:30:19 61SNC010_170_0009 Steering Steering Wheel Installation 1. efore installing the steering wheel, make sure the front wheels are aligned straight ahead, then center the cable reel (). Do this by first rotating the cable reel clockwise until it stops. Then rotate it counterclockwise about three full turns. The arrow mark () on the cable reel label point should point straight up. 3. Install the steering wheel bolt (), and tighten it to the specified torque. Connect the cable reel subharness connector (). Make sure the wire harness is routed and fastened properly. 39 N m (4.0 kgf m, 29 lbf ft) 4. Install the driver s airbag (see page ). 2. Position the two tabs () of the turn signal cancelling sleeve () as shown. Install the steering wheel on to the steering column shaft, making sure the steering wheel hub (C) engages the pins (D) of the cable reel and the tabs of the turn signal canceling sleeve. Do not tap on the steering wheel or steering column shaft when installing the steering wheel. D C 5. Reconnect the negative cable to the battery, and do the following items: NOTE: If the IM battery level gauge (T) displays no segments, start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in Park or neutral) until the T displays at least three segments. Turn the ignition swtich ON (II); the SRS indicator should come on for about 6 seconds and then go off. Enter the anti-theft code for the audio or navigation system, then enter the audio presets. Set the clock. Check the horn and turn signal switches work properly. Make sure the steering wheel switches work properly. Make sure the steering wheel is centered. 17-8

10 06/09/19 11:30:19 61SNC010_170_0010 Column Cover Removal and Installation NOTE: Take care not to scratch or damage the column covers. Do not pry the cover surface with any tools. 1. Release the lock lever (), and adjust the steering column to full tilt down position and to the full telescopic pull position. I K 4. Turn the steering wheel to the left, and release the left pawl (I) of the upper column cover while pushing the lower column cover from the front side. 5. Turn the steering wheel to the right, and release the right pawl (J) of the upper column cover while pushing the lower column cover from the front side. 6. Remove the cover by lightly pulling it up by releasing the right side hook (H) of the upper column cover. G K Carefully release the pawls, note the hooks (K) may break when upper column cover is pulled up too hard. 7. Remove the three screws, then remove the lower column cover (). J E C F D H 2. Insert a suitable sized screwdriver or equivalent tool () along the guide rib (C) into the lever hole (D) in the lower column cover (E). 3. Release the hook (F) located on the left side of the upper column cover (G). NOTE: The right side hook (H) of the upper column cover can t be released from the inside. 8. Install the upper and lower column cover in the reverse order of removal, and push the hooks into place securely. 17-9

11 06/09/19 11:30:20 61SNC010_170_0011 Steering Steering Column Removal and Installation SRS components are located in this area. Review the SRS component locations (see page 24-11) and the precautions and procedures (see page 24-13) before Doing repairs or service. Removal 6. Remove the steering joint cover (). e careful not to pull the bracket () on the front side of the steering column out of its normal position. If the bracket accidentally comes out, replace the steering column as an assembly. Normal position 7. Release the lock lever, and adjust the steering column to the full tilt up position, and to the full telescopic in position. 8. Tighten the lock lever. Out of position 9. Hold the lower slide shaft () on the column with a piece of wire () between the joint yoke (C) of the lower slide shaft and joint yoke (D) of the upper shaft to prevent the slider shaft from pulling out. D C 1. Make sure you have the anti-theft code for the audio or navigation system, then write down the audio presets. 2. Make sure the ignition switch is OFF, then disconnect the negative cable from the battery. 3. Remove the driver s airbag assembly and the steering wheel (see page 17-6). 4. Remove the driver s dashboard undercover (see page 20-89). 10. Release the lock lever, and adjust the steering column to the full telescopic out position, then tighten the lock lever. NOTE: Do not release lock lever when removing the steering column from the frame. 5. Remove the column covers (see page 17-9)

12 06/09/19 11:30:20 61SNC010_170_ Disconnect the wire harness connectors from the combination switch assembly and cable reel (). C 8 x 1.25 mm 28 N m (2.9 kgf m, 21 lbf ft) I F D H E 8 x 1.25 mm 22 N m (2.2 kgf m, 16 lbf ft) F G 8x1.25mm 13 N m (1.3 kgf m, 9.4 lbf ft) 12. Remove the combination switch assembly from the steering column shaft by removing the three screws (). 13. Disconnect the connectors from the ignition switch, and release the wire harness clips from the steering column. 14. Remove the steering joint bolt (C), then disconnect the steering joint (D) from the pinion shaft. 15. Remove the steering column (E) by removing the attaching nuts and bolts. If the lower slide shaft (F) is removed, slip it into the upper shaft (G) by aligning the paint or stamped marks (H). 16. Remove the center guide (I) (if equipped), and discard it. The center guide is for factory assembly only. (cont d) 17-11

13 06/09/19 11:30:21 61SNC010_170_0013 Steering Steering Column Removal and Installation (cont d) Installation 1. Install the steering column in the reverse order of removal, and note these items: Make sure the wires are not caught or pinched by any parts. Take care not to let the sliding capsules fall out of position during column installation. 2. Center the steering rack within its stroke in the steering joint connection. 4. lign the bolt hole () on the steering joint with the groove () around the pinion shaft, and loosely install the joint bolt (C). e sure that the joint bolt is securely in the groove in the pinion shaft. Pull on the steering joint to make sure that the steering joint is fully seated. Tighten the steering joint bolt to the specified torque. 3. With the rack in the straight ahead driving position, cut the wire () and slip the lower end of the steering joint onto the pinion shaft () in the range shown. C 8x1.25mm 28 N m (2.9 kgf m, 21 lbf ft) 5. Install the steering joint cover (). FRONT Install the steering wheel (see page 17-8). 7. Install the column covers. 8. Install the driver s dashboard undercover (see page 20-89). 9. Reconnect the negative cable to the battery, and do the following items: Turn the ignition switch ON (II); the SRS indicator should come on for about 6 seconds and then go off. Enter the anti-theft code for the audio or navigation system, then enter the audio presets. Set the clock. Check the horn and turn signal switches work properly. Make sure the steering wheel switches work properly. Make sure the steering wheel is centered

14 06/09/19 11:30:21 61SNC010_170_0014 Steering Column/Tilt/Telescopic Inspection Steering Lock Replacement 1. Remove the steering column (see page 17-10). Check the steering column ball bearing () and the steering joint bearings () for play and proper movement. If any bearing is noisy or has excessive play, replace the steering column as an assembly. Check the lower slide shaft (C) for smooth movement in and out. If the lower slide shaft is removed, slip it into the upper shaft by aligning the paint or stamped marks (D). If it sticks or binds, replace the steering column as an assembly. Check the sliding capsules (E) for distortion or breakage. If there is distortion or breakage, replace thesteeringcolumnasanassembly. Check the tilt mechanism and telescopic mechanism for movement and damage. Check the absorbing plates (F) for distortion or breakage. If there is distortion or breakage, replace thesteeringcolumnasanassembly. 2. Center-punch each of the two shear bolts, and drill the heads of the bolts off with a 5 mm (3/16 in.) drill bit. e careful not to damage the switch body when removing the shear bolts. D F E 3. Remove the shear bolts from the switch body. 4. Install the switch body without the key inserted. 5. Loosely tighten the new shear bolts. C 6. Insert the ignition key, and check for proper operation of the steering wheel lock and that the ignition key turns freely. 7. Tighten the shear bolts () until the hex heads () twist off. 8. Rewrite the new immobilizer control unit receiver (see page ), and make sure the immobilizer system works properly

15 06/09/19 11:30:21 61SNC010_170_0015 Steering Rack Guide djustment Special Tools Required Locknut wrench, 43 mm 07M-SL Set the wheels in the straight ahead position. 4. Tighten the rack guide screw () to 25 N m (2.5 kgf m, 18 lbf ft), then loosen it Loosen the rack guide screw locknut () with the locknut wrench, then remove the rack guide screw (). 07M-SL Remove the old sealant from the rack guide screw (), and apply new sealant (Three ond 1215 or Loctite 5699) to the middle of the threads (). Loosely install the rack guide screw on the steering gearbox. Specified return angle: N m (4.5 kgf m, 33 lbf ft) 5. Retighten the rack guide screw to 3.9 N m (0.4 kgf m, 2.9 lbf ft), then back it off to the specified angle. 6. Hold the rack guide screw stationary with a wrench, and install the locknut () by hand until it s fully seated. 7. Install the locknut wrench on the locknut, and hold the rack guide screw stationary with a wrench. Tighten the locknut to the specified torque. 8. Check for unusual steering effort through the complete turning travel. 9. Check the steering wheel rotational play (see page 17-4), and the power assist (see page 17-4)

16 06/09/19 11:30:22 61SNC010_170_0016 Steering Steering EPS (Electrical Power Steering) Components Component Location Index General Troubleshooting Information Memorizing the Torque Sensor Neutral Position DTC Troubleshooting Index Symptom Troubleshooting Index System Description Circuit Diagram DTC Troubleshooting Symptom Troubleshooting Motor Removal and Installation Steering Gearbox Removal and Installation Rack End Removal and Installation Rack Guide Removal/Installation EPS Control Unit Removal/Installation Tie-rod all Joint oot Replacement Gearbox Mount Cushion Replacement

17 06/09/19 11:30:23 61SNC010_170_0017 EPS Components Component Location Index UNDER-HOOD FUSE/RELY OX DT LINK CONNECTOR (DLC) GUGE CONTROL MODULE (TCH) TTERY UNDER-DSH FUSE/RELY OX EPS CONTROL UNIT Removal/Installation, page STEERING GEROX Removal and Installation, page Rack End Removal and Installation, page Rack Guide Removal/Installation, page Tie-rod all Joint oot Replacement, page Gearbox Mount Cushion Replacement, page MOTOR Removal and Installation, page EPS INDICTOR 17-16

18 06/09/19 11:30:23 61SNC010_170_0018 General Troubleshooting Information EPS Indicator Under normal conditions, the EPS indicator comes on when the ignition switch is turned to the ON (II) position, then goes off after the engine is started. This indicates that the LED and its circuit are operating correctly. If there is a failure in the system after the engine is started, the EPS indicator will stay on, and the power assist is turned off. When the EPS indicator comes on, the control unit memorizes the DTC. In this case, the control unit will not activate the EPS system after the engine starts again, but it keeps the EPS indicator on. When DTC 51-01, or is stored in the control unit, the EPS indicator will stay on until the DTC is erased. When a problem is detected and the EPS indicator comes on, there are cases when the indicator stays on until the ignition switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. Even though the system is operating normally, the EPS indicator will come on under the following conditions: The vehicle speed decreases abruptly from 12 mph (20 km/h) or more (by applying brake), and it is less than 1 mph (1 km/h) and engine speed is 2,000 rpm or above for 5 seconds (continuously) after the abrupt deceleration. While turning the steering wheel with the vehicle speed of 1 mph (1 km/h) or less for 20 seconds, and the engine speed is 2,000 rpm or above for at least 10 seconds. When the engine speed is 500 rpm or less, and the vehicle is traveling at a speed of 6 mph (10 km/h) or more for about 3 seconds. To determine the actual cause of the problem, question the customer about the conditions during which the problem occurred, taking the above conditions into consideration. Diagnostic Trouble Code (DTC) If the CPU cannot be activated, or it fails, the EPS indicator comes on, but the DTC is not memorized. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the most recent DTC is written over the prior DTC, therefore only one occurrance is memorized. The lowest DTC is indicated first. The DTCs are indicated in ascending order, not in the order that they occurred. The DTCs are memorized in the EEPROM (nonvolatile memory) therefore the memorized DTCs cannot be erased by disconnecting the battery. Perform the specified procedures to clear the DTCs. Self-diagnosis Self-diagnosis can be classified into three categories: Initial diagnosis: Done right after the engine starts and until the EPS indicator goes off. Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned OFF. Steering diagnosis: Done during regular diagnosis while turning the steering wheel. The EPS control unit performs the following functions when a problem is detected by self-diagnosis: 1. Turns on the EPS indicator. 2. Memorizes the DTC. 3. Stops power assist and manual steering operation resumes. NOTE: For DTCs 11-01, 11-02, 12-01, 21-01, 21-02, and the EPS indicator will go off automatically, and the system returns to normal. (cont d) 17-17

19 06/09/19 11:30:24 61SNC010_170_0019 EPS Components General Troubleshooting Information (cont d) Restriction on Power ssist Operation Repeated extreme steering force, such as turning the steering wheel continuously back-and-forth with the vehicle stopped, causes an increase of power consumption in the EPS motor. The increase of electric current causes the motor to heat up. ecause this heat adversely affects the system, the control unit monitors the electric current of the motor. When the control unit detects heat build-up in the motor, it reduces the electric current to the motor gradually to protect the system, and it restricts the power assist operation. The EPS indicator does not come on during this function. When steering torque is not applied to the steering wheel, or when the ignition is turned off and the motor cools, the control unit will restore the power assist gradually until it s fully restored (after about 8 minutes). Torque Sensor Neutral Position The EPS control unit stores the torque sensor neutral position in the EEPROM. The torque sensor neutral position must be memorized whenever the gearbox, the motor, or the EPS control unit is replaced. How to Troubleshoot DTCs The troubleshooting procedures assume that the cause of the problem is still present and the EPS indicator is still on. Following the procedure when the EPS indicator does not come on can result in incorrect diagnosis. 1. Question the customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the EPS indicator came on, such as during EPS control, after EPS control, when the vehicle was at a certain speed, etc. 2. When the EPS indicator does not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor terminal contact, etc., in the affected circuit before you start troubleshooting. 3. fter troubleshooting, clear the DTC and test-drive the vehicle. e sure the EPS indicator does not come on. NOTE: The torque sensor neutral position is not effected when erasing the DTCs

20 06/09/19 11:30:24 61SNC010_170_0020 How to Retrieve DTCs How to Clear DTCs 1. With the ignition switch OFF, connect the HDS (Honda diagnostic system) to the DLC (data link connector) () located under the driver s side of the dashboard. 1. With the ignition switch OFF, connect the HDS to the DLC (data link connector) () located under the driver s side of the dashboard. 2. Turn the ignition switch ON (II). 3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it doesn t, troubleshoot the DLC circuit (see page ). 4. Follow the prompts on the HDS to display the DTC(s) on the screen. fter determining the DTC, refer to the DTC Troubleshooting. NOTE: See the HDS Help menu for specific instructions. 2. Turn the ignition switch ON (II). 3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it doesn t, troubleshoot the DLC circuit (see page ). 4. Clear the DTC(s) by following the screen prompts on the HDS. NOTE: See the HDS Help menu for specific instructions. 5. Turn the ignition switch OFF. 5. Turn the ignition switch OFF

21 06/09/19 11:30:46 61SNC010_170_0021 EPS Components Memorizing the Torque Sensor Neutral Position The torque sensor neutral position must be memorized whenever the gearbox, the motor, or the EPS control unit is replaced. Note that the torque sensor neutral position is not affected when erasing the DTC. NOTE: The torque sensor is temperature sensitive. When memorizing the torque sensor neutral position, theambienttemperaturemustbeabove68 F(20 C). 1. With the ignition switch OFF, connect the HDS to the DLC (data link connector) () located under the driver s side of the dashboard. 2. Turn the ignition switch ON (II). 3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it doesn t, troubleshoot the DLC circuit (see page ). 4. From the EPS MENU, select MISCELLNEOUS TEST then TORQUE SENSOR LERN and follow the screen prompts on the HDS. NOTE: See the HDS Help menu for specific instructions. 5. Turn the ignition switch OFF

22 06/09/19 11:30:46 61SNC010_170_0022 DTC Troubleshooting Index DTC Detection Item Note Low/high IG1-terminal voltage (Initial diagnosis) (see page 17-29) Low/high IG1-terminal voltage (Regular diagnosis) (see page 17-30) Low/high VU voltage (Regular diagnosis) (see page 17-31) Excessive change of the vehicle speed signal (Regular diagnosis) (see page 17-32) Comparison between the vehicle speed and the engine speed signal (see page 17-32) (Regular diagnosis) Engine speed signal (Initial diagnosis) (see page 17-34) No writing the torque sensor neutral position (Initial diagnosis) (see page 17-20) EPS control unit internal circuit (current sensor) (Initial diagnosis) (see page 17-36) EPS control unit internal circuit (current sensor) (Regular diagnosis) (see page 17-36) EPS control unit internal circuit (current sensor) (Steering diagnosis) (see page 17-36) Current sensor (Regular diagnosis) (see page 17-37) Current sensor (Initial diagnosis) (see page 17-37) Lower FET stuck ON (Initial diagnosis) (see page 17-38) Upper FET stuck ON (Initial diagnosis) (see page 17-40) Lower FET stuck ON (Regular diagnosis) (see page 17-38) Upper FET stuck ON (Regular diagnosis) (see page 17-40) Power relay stuck ON (IG switch is OFF) (see page 17-42) Fail-safe relay stuck ON (Initial diagnosis) (see page 17-42) EPS control unit internal circuit (CPU) (Initial diagnosis/regular (see page 17-36) diagnosis) EPS control unit internal circuit (EEPROM) (Initial diagnosis) (see page 17-36) EPS control unit internal circuit (EPS CPU) (Initial diagnosis) (see page 17-43) EPS control unit internal circuit (CPU communication) (Regular (see page 17-36) diagnosis) EPS control unit internal circuit (motor/eps CPU) (Initial diagnosis) (see page 17-43) EPS control unit internal circuit (ITN communication) (Regular diagnosis) (see page 17-36) EPS control unit internal circuit (INHL/INHR ports) (Initial diagnosis/ (see page 17-36) Regular diagnosis) NOTE: Initial diagnosis: Done right after the engine starts and until the EPS indicator goes off. Regular diagnosis: Done right after the initial diagnosis unitl the ignition switch is turned off. Steering diagnosis: Done in during regular diagnosis while turning steering wheel. (cont d) 17-21

23 06/09/19 11:30:46 61SNC010_170_0023 EPS Components DTC Troubleshooting Index (cont d) DTC Detection Item Note EPS control unit internal circuit (INH output circuit) (Initial diagnosis) (see page 17-36) EPS control unit internal circuit (step-up circuit) (Initial diagnosis) (see page 17-36) Low/high voltage for the torque sensor (VT1 and VT2) (Regular (see page 17-44) diagnosis) Torque sensor (VT3 differential-amplification Function) (Regular (see page 17-47) diagnosis) Torque sensor (VT1, VT2 rapid change) (Regular diagnosis) (see page 17-47) Torque sensor (VT1, VT2 average) (Regular diagnosis) (see page 17-47) Torque sensor (VT1, VT2 initial check) (Initial diagnosis) (see page 17-47) Open/short in the motor harness (Steering diagnosis) (see page 17-50) Motor angle sensor (SIN/COS signals) (Steering diagnosis) (see page 17-52) Motor angle sensor (neutral position learning of SIN/COS) (Initial (see page 17-52) diagnosis) Motor angle sensor (SIN/COS signals) (Steering diagnosis) (see page 17-52) Motor angle sensor (check signal) (Regular diagnosis) (see page 17-55) Motor angle sensor (SIN/COS signals changing amount) (Steering (see page 17-52) diagnosis) Motor angle sensor (neutral position of SIN/COS) (Initial diagnosis) (see page 17-52) NOTE: Initial diagnosis: Done right after the engine starts and until the EPS indicator goes off. Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned off. Steering diagnosis: Done during regular diagnosis while turning steering wheel

24 06/09/19 11:30:46 61SNC010_170_0024 Symptom Troubleshooting Index Symptom Diagnostic procedure EPS indicator does not come on Symptom Troubleshooting (see page 17-57) EPS indicator does not go off, and no Symptom Troubleshooting (see page 17-58) DTCs are stored EPS indicator is not on, no DTCs are 1. Check the motor power wires between the EPS control unit and stored, but there is no power assist or the motor for a short to ground. Repair as needed. power assist is down 2. If the motor power wires are OK, replace the motor (short in the motor) (see page 17-60). HDS does not communicate with the EPS control unit or the vehicle 3. Check the power and ground connections at the EPS control unit. Troubleshoot the DLC circuit (see page ) 17-23

25 06/09/19 11:30:46 61SNC010_170_0025 EPS Components System Description EPS Control Unit Inputs and Outputs for Connector (2P) Terminal Wire color Terminal sign number (Terminal name) 1 LK PG (Power ground) 2 WHT (Plus battery) Description Ground for the actuator motor Power source for the actuator motor Signal Terminals Conditions Results 2 GND t all times attery voltage EPS Control Unit Inputs and Outputs for Connector (2P) Terminal Wire color Terminal sign Description number (Terminal name) 1 GRN H-W Drives the actuator motor Signal Terminals Conditions Results EPS Control Unit Inputs and Outputs for Connector C (2P) Terminal number Wire color Terminal sign (Terminal name) Description 1 RED H-U Drives the actuator motor 2 LU H-V Drives the actuator motor Signal Terminals Conditions Results 17-24

26 06/09/19 11:30:47 61SNC010_170_0026 EPS Control Unit Inputs and Outputs for Connector D (28P) Terminal number Wire color Terminal sign (Terminal name) 1 WHT CN-H (CN-HI) 3 LU NEP (Engine pulse) 7 RN SCS (Service check signal) 8 LT GRN VS2 (Voltage sensor 2) 9 RN PVF (Voltage fade) 10 GRN VS1 (Voltage sensor 1) 12 PNK S1 (Signal 1) 13 LU R1 (Motor angle sensor 1) 14 RN S2 (Signal 2) 15 RED CN-L (CN-LO) 1 16 YEL IG 1 2 GRY (Ignition 1) 17 LT LU K-LINE (Data link connector) 26 RN S3 (Signal 3) 27 PNK R2 (Motor angle sensor 2) 28 LU S4 (Signal 4) 1: 06 model 2: 07 model Description CN communication circuit Signal Terminals Conditions Results Detects tachometer signal 3 GND With engine running Pulses Detects service check connector signal Detects torque sensor signal Drives the torque sensor Detects torque sensor signal Detects motor angle sensor signal Detects motor angle sensor signal Detects motor angle sensor signal CN communication circuit 7 GND SCS not grounded attery voltage Power source for activating 16 GND Ignition switch ON (II) attery voltage the systrem Ignition switch OFF 0 V Communicates with HDS 17 GND HDS not connected bout 5 V Detects motor angle sensor signal Detects motor angle sensor signal Detects motor angle sensor signal 17-25

27 06/09/19 11:30:47 61SNC010_170_0027 EPS Components Circuit Diagram TTERY UNDER-HOOD FUSE/RELY OX No. 1 (70 ) No. 1 (100 ) 1 WHT IGNITION UNDER-DSH SWITCH FUSE/RELY OX H1 3 6 D2 F16 WHT LU No. 2 (50 ) No. 4 (7.5 ) Q9 IG1 HOT in ON (II) and STRT (III) No. 10 (7.5 ) YEL* 2 GRY* IG1 1 RN GUGE CONTROL MODULE (TCH) 17 EPS INDICTOR IG1 1 CN-H 19 CN-L RN WHT RED PCM 28 NEP 36 CN-H 37 CN-L LU WHT RED DT LINK CONNECTOR (DLC) 6 CN-H 14 CN-L 9 SCS 7 K-LINE WHT RED ORN LT LU RN 17-26

28 06/09/19 11:30:47 61SNC010_170_0028 EPS CONTROL UNIT STEERING GEROX WHT 1 YEL* 2 GRY* 2 D16 IG1 IG1 POWER RELY 5V REGULTOR VCC D13 LU R1 D27 PNK R2 D12 PNK S1 D26 RN S3 D14 RN S2 2 RN 5 GRN 1 YEL 4 LU 3 LK R1 R2 S1 S3 S2 MOTOR NGLE SENSOR D28 LU S4 6 RED S4 LU D3 NEP FIL-SFE RELY 1 GRN H-W 2 RED H-W MOTOR FIL-SFE RELY C1 RED H-U 1 LK H-U C2 LU H-V 1 WHT H-V 1 PG LK G402 WHT RED RN D1 CN-H D15 CN-L D7 SCS CN CONTROLLER D10 GRN VS1 D9 RN PVF D8 LT GRN VS2 PNK LU/RED WHT/GRN 1 VS1 2 PVF 3 VS2 TORQUE SENSOR LT LU D17 K-LINE G403 :12V :5V *1: 06 model *2: 07 model (cont d) 17-27

29 06/09/19 11:30:47 61SNC010_170_0029 EPS Components Circuit Diagram (cont d) UNDER-HOOD FUSE/RELY OX CONNECTOR(1P) UNDER-DSH FUSE/RELY OX CONNECTOR Q (16P) UNDER-DSH FUSE/RELY OX CONNECTOR F (34P) GUGE CONTROL MODULE (TCH) 36P CONNECTOR EPS CONTROL UNIT CONNECTOR (2P) EPS CONTROL UNIT CONNECTOR (2P) EPS CONTROL UNIT CONNECTOR C (2P) EPS CONTROL UNIT CONNECTOR D (28P) TORQUE SENSOR 3P CONNECTOR MOTOR 1P CONNECTOR MOTOR 2P CONNECTOR MOTOR NGLE SENSOR 6P CONNECTOR Terminal side of male terminals PCM CONNECTOR (44P) DT LINK CONNECTOR (DLC) Terminal side of female terminals 17-28

30 06/09/19 11:30:47 61SNC010_170_0030 DTC Troubleshooting DTC 11-01: Low/High IG1-terminal Voltage (Initial diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. 4. Wait at least 60 seconds. Does the EPS indicator come on? YES Go to step 5. NO Check for loose wires or poor connections. If the connections are good, the system is OK at this time. 5. Turn the ignition switch OFF. 6. Disconnect EPS control connector D (28P). 7. Turn the ignition switch ON (II). 8. Wait at least 60 seconds. 9. Measure voltage between EPS control unit connector D (28P) terminals No. 16 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) *1 : 06 model *2 : 07 model IG1 (YEL)* (GRY)* 1 2 Is the voltage between V? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Check for a poor connection at the 12 V battery (see page 22-58). If they are good, go to the charging system indicator circuit Troubleshooting (see page )

31 06/09/19 11:30:48 61SNC010_170_0031 EPS Components DTC Troubleshooting (cont d) DTC 11-02: Low/High IG1-terminal Voltage (Regular diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. 4. Wait at least 60 seconds. Does the EPS indicator come on? YES Go to step 5. NO Check for loose wires or poor connections. If the connections are good, the system is OK at this time. 5. Turn the ignition switch OFF. 6. Disconnect EPS control connector D (28P). 7. Turn the ignition switch ON (II). 8. Wait at least 60 seconds. 9. Measure voltage between EPS control unit connector D (28P) terminals No. 16 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) *1 : 06 model *2 : 07 model IG1 (YEL)* (GRY)* 1 2 Is the voltage between V? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Check for a poor connection at the 12 V battery (see page 22-58). If they are good, go to the charging system indicator circuit Troubleshooting (see page )

32 06/09/19 11:30:48 61SNC010_170_0032 DTC 12-01: Low-High VU Voltage (Regular diagnosis) 1. Turn the ignition switch OFF. 2. Connect the HDS to the data link connector (DLC). 3. Turn the ignition switch ON (II). 4. Check the TTERY in the DT LIST with the HDS. Is the voltage at V? YES Check for loose wires or poor connections. If the connections are good, the system is OK at this time. NO Go to step Turn the ignition switch OFF. 6. Check the No.1 (70 ) fuse in the under-hood fuse/ relay box. IsthefuseOK? YES Reinstall the fuse, and go to step 7. NO Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. 7. Disconnect EPS control unit connector (2P) and connector D (28P). 8. Measure voltage between EPS control unit connector (2P) terminal No. 2 and body ground. EPS CONTROL UNIT CONNECTOR (2P) (WHT) Is there battery voltage? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Repair open in the wire between the EPS control unit and No. 1 (70 ) fuse in the under-hood fuse/relay box

33 06/09/19 11:30:48 61SNC010_170_0033 EPS Components DTC Troubleshooting (cont d) DTC 21-01: Excessive Change of the Vehicle Speed Signal (Regular diagnosis) DTC 21-02: Comparison between the Vehicle Speed and the Engine Speed Signal (Regular diagnosis) NOTE: If the MIL indicator is on, troubleshoot the fuel and emissions systems first. Even though the system is operating normally, the EPS indicator will come on caused by the detecting condition of DTC or DTC Turn the ignition switch OFF. 2. Raise the vehicle, and support it with safety stands in the proper locations (see page 1-8), and allow all wheels to rotate freely. 3. Connect the HDS to the data link connector (DLC). 4. Start the engine, test the vehicle in the D position. 6. Check for DTCs in the /T system with the HDS. Is DTC P0721, or P0722 indicated? YES Troubleshoot the indicated DTC. NO Go to step Start the engine and check the tachometer. Is the tachometer working correctly? YES Go to step 8. NO Troubleshoot the gauge control module (tach) (see page ). 8. Turn the ignition switch OFF. 9. Short the SCS line with the HDS. 10. Disconnect PCM connector (44P) and EPS control unit connector D (28P). 5. Check the VEHICLE SPEED in the DT LIST with the HDS. Is the vehicle speed indicated? YES The system is OK at this time. NO Go to step

34 06/09/19 11:30:48 61SNC010_170_ Check for continuity between EPS control unit connector D (28P) terminals No. 1 and PCM connector (44P) terminals No. 36. EPS CONTROL UNIT CONNECTOR D (28P) 12. Check for continuity between EPS control unit connector D (28P) terminals No. 15 and PCM connector (44P) terminals No. 37. EPS CONTROL UNIT CONNECTOR D (28P) CN-H (WHT) CN-L (RED) PCM CONNECTOR (44P) PCM CONNECTOR (44P) CN-H (WHT) CN-L (RED) Terminal side of female terminals Terminal side of female terminals Is there continuity? Is there continuity? YES Go to step 12. NO Repair open in the wire between the EPS control unit and the PCM. YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Repair open in the wire between the EPS control unit and the PCM

35 06/09/19 11:30:48 61SNC010_170_0035 EPS Components DTC Troubleshooting (cont d) DTC 22-01: Engine Speed Signal (Initial diagnosis) NOTE: If the MIL indicator is on, troubleshoot the fuel and emissions systems first. 1. Turn the ignition switch OFF. 2. Connect the HDS to the data link connector (DLC). 3. Start the engine. 4. Check the ENGINE SPEED in the DT LIST with the HDS. Is there 0 rpm at idle? YES Go to step 5. NO The system is OK at this time. 5. Turn the ignition switch OFF. 6. Disconnect EPS control unit connector D (28P). 7. Start the engine. 8. Measure voltage between EPS control unit connector D (28P) terminal No. 3 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) NEP (LU) YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Go to step 9. Is there any voltage? 17-34

36 06/09/19 11:30:49 61SNC010_170_ Turn the ignition switch OFF. 10. Check for continuity between EPS control unit connector D (28P) terminal No. 3 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) 13. Check for continuity between EPS control unit connector D (28P) terminals No. 3 and PCM connector (44P) terminals No. 28. EPS CONTROL UNIT CONNECTOR D (28P) NEP (LU) NEP (LU) PCM CONNECTOR (44P) Is there continuity? YES Repair short to body ground in the wire between the EPS control unit and the PCM. Is there continuity? NEP (LU) Terminal side of female terminals NO Go to step Short the SCS line with the HDS. 12. Disconnect PCM connector (44P). YES Check for loose terminals in the PCM connector (44P), and repair if necessary. If no poor connections are found replace the PCM (see page ). NO Repair open in the wire between the EPS control unit and the PCM

37 06/09/19 11:30:49 61SNC010_170_0037 EPS Components DTC Troubleshooting (cont d) DTC 32-01: EPS Control Unit Internal Circuit (Current Sensor) (Initial diagnosis) DTC 32-02: EPS Control Unit Internal Circuit (Current Sensor) (Regular diagnosis) DTC 35-01: EPS Control Unit Internal Circuit (CPU) (Initial diagnosis/regular diagnosis) DTC 35-02: EPS Control Unit Internal Circuit (EEPROM) (Initial diagnosis) DTC 35-04: EPS Control Unit Internal Circuit (CPU Communication) (Regular diagnosis) DTC 35-06: EPS Control Unit Internal Circuit (ITN Communication) (Regular diagnosis) DTC 35-07: EPS Control Unit Internal Circuit (INHL/INHR Ports) (Initial diagnosis/regular diagnosis) DTC 36-02: EPS Control Unit Internal Circuit (INH Output Circuit) (Initial diagnosis) DTC 37-01: EPS Control Unit Internal Circuit (Step-up Circuit) (Initial diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. DTC 32-07: EPS Control Unit Internal Circuit (Current Sensor) (Diagnosis when steering wheel turning) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. 4. Turn the steering wheel to the right or left, and wait 10 seconds or more. Does the EPS indicator come on? YES Go to step 5. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 5. Check for DTCs with the HDS. Is DTC indicated? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Check for DTCs with the HDS. Is DTC 32-01, 32-02, 35-01, 35-02, 35-04, 35-06, 35-07, 36-02, or 37-01? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time

38 06/09/19 11:30:49 61SNC010_170_0038 DTC 32-08: Current Sensor (Regular diagnosis) DTC 32-09: Current Sensor (Initial diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. 4. Turn the steering wheel to the right or left, and wait 10 seconds or more. Does the EPS indicator come on? YES Go to step 5. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 5. Check for DTCs with the HDS. Is DTC or DTC indicated? YES Go to step 6. NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. 6. Turn the ignition switch OFF. 7. Disconnect EPS control unit connector (2P) and connector C (2P). 8. Check for continuity between the following terminals of the EPS control unit connector (2P) and connector C (2P). EPS CONTROL UNIT CONNECTOR No. 1 No. 1 YES Check for loose terminals in the EPS control unit connectors and motor connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Go to step 9. EPS CONTROL UNIT CONNECTOR C No. 1 No. 2 No. 1 No. 2 EPS CONTROL UNIT CONNECTOR (2P) H-W (GRN) EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) Is there continuity? H-V (LU) (cont d) 17-37

39 06/09/19 11:30:49 61SNC010_170_0039 EPS Components DTC Troubleshooting (cont d) 9. Disconnect the motor 1P connector and motor 2P connector. 10. On the motor side, check for continuity between the following terminals of the motor 1P and motor 2P connector. MOTOR 1P CONNECTOR No. 1 No. 1 MOTOR 1P CONNECTOR H-U (LK) H-W (RED) MOTOR 2P CONNECTOR No. 1 No. 2 No. 1 No. 2 H-V (WHT) Terminal side of male terminals MOTOR 2P CONNECTOR Terminal side of male terminals Is there continuity? YES Repair open in the wire harness between the EPS control unit and motor. NO Open in the motor wire harness, or motor internal circuit, replace the motor (see page 17-60). DTC 33-01: Lower FET Stuck ON (Initial diagnosis) DTC 33-06: Lower FET Stuck ON (Regular diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Check for DTCs with the HDS. Is DTC or DTC indicated? YES Go to step 5. NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. 5. Turn the ignition switch OFF. 6. Disconnect EPS control unit connector (2P) and connector C (2P)

40 06/09/19 11:30:49 61SNC010_170_ Check for continuity between body ground and EPS control unit connector (2P) No. 1 terminal, connector C (2P) No. 1 terminal, connector C (2P) No. 2 terminal individually. EPS CONTROL UNIT CONNECTOR (2P) 8. Disconnect the motor 1P connector and motor 2P connector. 9. Check for continuity between body ground and EPS control unit connector (2P) No. 1 terminal, connector C (2P) No. 1 terminal, connector C (2P) No. 2 terminal individually. H-W (GRN) EPS CONTROL UNIT CONNECTOR (2P) H-W (GRN) EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (LU) EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (LU) Is there continuity? YES Go to step 8. NO Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). Is there continuity? YES Repair short to body ground in the wire between the EPS control unit and motor. NO Short in the motor wire harness, or the motor internal circuit, replace the motor (see page 17-60)

41 06/09/19 11:31:03 61SNC010_170_0041 EPS Components DTC Troubleshooting (cont d) DTC 33-02: Upper FET Stuck ON (Initial diagnosis) DTC 33-07: Upper FET Stuck ON (Regular diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Start the engine. Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Check for DTCs with the HDS. 8. Measure voltage between body ground and EPS control unit connector (2P) No. 1 terminal, connector C (2P) No. 1 terminal, connector C (2P) No. 2 terminal individually. EPS CONTROL UNIT CONNECTOR (2P) H-W (GRN) EPS CONTROL UNIT CONNECTOR C (2P) Is DTC or DTC indicated? YES Go to step 5. NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. 5. Turn the ignition switch OFF. H-U (RED) H-V (LU) 6. Disconnect EPS control unit connector (2P) and connector C (2P). 7. Turn the ignition switch ON (II). Is there battery voltage? YES Go to step 9. NO Check for loose terminals in the EPS control unit connectors and motor connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). 9. Turn the ignition switch OFF

42 06/09/19 11:31:04 61SNC010_170_ Disconnect the motor 1P connector and motor 2P connector. 11. Turn the ignition switch ON (II). 12. Measure voltage between body ground and EPS control unit connector (2P) No.1 terminal, connector C (2P) No. 1 terminal, and connector C (2P) No. 2 terminal individually. EPS CONTROL UNIT CONNECTOR (2P) H-W (GRN) EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (LU) Is there battery voltage? YES Repair short to power in the wire between the EPS control unit and motor. NO Short to power in the motor wire harness, or motor internal circuit, replace the motor (see page 17-60)

43 06/09/19 11:31:04 61SNC010_170_0043 EPS Components DTC Troubleshooting (cont d) DTC 34-01: Power Relay Stuck ON (Ignition DTC 34-02: Fail-safe Relay Stuck ON (Initial switch is OFF) diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Turn the ignition switch ON (II). Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Check for DTCs with the HDS. Is DTC indicated? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Turn the ignition switch ON (II). Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Check for DTCs with the HDS. Is DTC indicated? YES Go to step 5. NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. 5. Turn the ignition switch OFF. 6. Disconnect EPS control unit connector (2P) and connector C (2P). 7. Turn the ignition switch ON (II)

44 06/09/19 11:31:04 61SNC010_170_ Measure voltage between body ground and EPS control unit connector (2P) No. 1 terminal, connector C (2P) No. 1 terminal, and connector C (2P) No. 2 terminal individually. EPS CONTROL UNIT CONNECTOR (2P) H-W (GRN) EPS CONTROL UNIT CONNECTOR C (2P) DTC 35-03: EPS Control Unit Internal Circuit (EPS CPU) (Initial diagnosis) DTC 35-05: EPS Control Unit Internal Circuit (Motor/EPS CPU) (Initial diagnosis) 1. Clear the DTC with the HDS. 2. Turn the ignition switch OFF. 3. Turn the ignition switch ON (II). Does the EPS indicator come on? YES Go to step 4. NO Check for loose terminals or poor connections. If the connections are good, the system is OK at this time. 4. Start the engine. H-U (RED) H-V (LU) 5. Wait 10 seconds or more. 6. Check for DTCs with the HDS. Is DTC or DTC indicated? Is there battery voltage? YES Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see page 17-79). NO Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time. YES Repair short to power in the wire harness between the EPS control unit and the motor. NO Replace the EPS control unit (see page 17-79)