52-01

EPS DTC Troubleshooting: 52-01, 52-03, 52-04, 52-05

DTC 52-01: Torque Sensor Allowable Tolerance (Initial Diagnosis)

DTC 52-03: Main Torque Sensor (Regular Diagnosis)

DTC 52-04: Sub Torque Sensor (Regular Diagnosis)

DTC 52-05: Torque Sensor Allowable Tolerance (Control) (Regular Diagnosis)

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. Check for DTCs with the HDS.

Is DTC 52-01, 52-03, 52-04, or 52-05 indicated?
YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit.


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

7. Disconnect EPS control unit connector B (16P).

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

9. Measure the voltage between body ground and EPS control unit connector B (16P) terminals No. 1, No. 2, No. 3, No. 4, and No. 5 individually.

Is there battery voltage?
YES - Repair short to power in the wire harness between the EPS control unit and the torque sensor.

NO - Go to step 10.






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

11. Check for continuity between body ground and EPS control unit connector B (16P) terminals No. 1, No. 2, No. 3, No. 4, and No. 5 individually.

Is there continuity?
YES - Repair short to body ground in the wire harness between the EPS control unit and the torque sensor.

NO - Go to step 12.






12. Disconnect the torque sensor 6P connector from the torque sensor on the steering gearbox.

13. Check for continuity between torque sensor 6P connector terminal No. 5 and EPS control unit connector B (16P) terminal No. 5.

Is there continuity?
YES - Go to step 14.

NO - Repair open in the wire between the EPS control unit and the torque sensor.






14. Check for continuity between torque sensor 6P connector terminal No. 4 and EPS control unit connector B (16P) terminal No. 2.

Is there continuity?
YES - Go to step 15.

NO - Repair open in the wire between the EPS control unit and the torque sensor.






15. Check for continuity between torque sensor 6P connector terminal No. 3 and EPS control unit connector B (16P) terminal No. 3.

Is there continuity?
YES - Go to step 16.

NO - Repair open in the wire between the EPS control unit and the torque sensor.






16. Check for continuity between torque sensor 6P connector terminal No. 1 and EPS control unit connector B (16P) terminal No. 4.

Is there continuity?
YES - Go to step 17.

NO - Repair open in the wire between the EPS control unit and the torque sensor.






17. Check for continuity between torque sensor 6P connector terminal No. 6 and EPS control unit connector B (16P) terminal No. 1.

Is there continuity?
YES - Go to step 18.

NO - Repair open in the wire between the EPS control unit and the torque sensor.






18. Substitute a known-good EPS control unit. Service and Repair

19. Connect the torque sensor 6P connector.

20. Start the engine.

21. Check for DTCs with the HDS.

Is DTC 52-01, 52-03, 52-04, or 52-05 indicated?
YES - The fault is an open or short in the torque sensor internal circuit. Replace the steering gearbox. Steering Gearbox Removal and Installation

NO - Replace the original EPS control unit. Service and Repair