51-04

EPS DTC Troubleshooting: 51-01, 51-02, 51-03, 51-04, 51-05

DTC 51-01:

Torque Sensor (VT1, VT2, Low/High Check)

DTC 51-02:

Torque Sensor (VT3 Differential-Amplification Function)

DTC 51-03:

Torque Sensor (VT1, VT2 Rapid change)

DTC 51-04:

Torque Sensor (Temperature)

DTC 51-05:

Torque Sensor (Coil)

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0).

4. Start the engine.

5. Turn the steering wheel to full left or full right, and hold the steering wheel for 10 seconds or more.

6. Check for DTCs with the HDS.

Is DTC 51-01, 51-02, 51-03, 51-04, or 51-05 indicated?

YES -

Go to step 7.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS motor and the EPS control unit.

7. Turn the ignition switch to LOCK (0).

8. Disconnect EPS control unit connector C (16P).

9. Measure the resistance between EPS control unit connector C (16P) terminals No. 2 and No. 3.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Go to step 10.

NO -

Go to step 12.

10. Disconnect the torque sensor 3P connector.

11. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Replace the steering gearbox Steering Gearbox Removal/Installation.

NO -

Repair a short in the wires between the EPS control unit and the torque sensor.

12. Measure the resistance between EPS control unit connector C (16P) terminals No. 1 and No. 2.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Go to step 13.

NO -

Go to step 15.

13. Disconnect the torque sensor 3P connector.

14. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 2 and No. 3.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Replace the steering gearbox Steering Gearbox Removal/Installation.

NO -

Repair a short in the wires between the EPS control unit and the torque sensor.

15. Measure the resistance between EPS control unit connector C (16P) terminals No. 1 and No. 3.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Go to step 16.

NO -

Go to step 18.

16. Disconnect the torque sensor 3P connector.

17. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 3.





Is the resistance 10 Ohms or less at 68 °F (20 °C)?

YES -

Replace the steering gearbox Steering Gearbox Removal/Installation.

NO -

Repair a short in the wires between the EPS control unit and the torque sensor.

18. Check for continuity between body ground and EPS control unit connector C (16P) terminal No. 1, and terminal No. 3 individually.





Is there continuity?

YES -

Go to step 19.

NO -

Go to step 21.

19. Disconnect the torque sensor 3P connector.

20. On the torque sensor side, check for continuity between body ground and torque sensor 3P connector terminal No. 1, and terminal No. 3 individually.





Is there continuity?

YES -

Replace the steering gearbox Steering Gearbox Removal/Installation.

NO -

Repair a short to body ground in the wire between the EPS control unit and the torque sensor.

21. Disconnect the torque sensor 3P connector.

22. Check for continuity between the EPS control unit connector C (16P) terminals and the torque sensor 3P connector terminals (see table).









Is there continuity?

YES -

Go to step 23.

NO -

Repair an open in the wire between the EPS control unit and the torque sensor.

23. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2, and No. 2 and No. 3 individually.





Is the resistance 10-40 Ohms at 68 °F (20 °C)?

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 Service and Repair.

NO -

Replace the steering gearbox Steering Gearbox Removal/Installation.