34-02

EPS DTC Troubleshooting: 34-02

DTC 34-02: Fail-Safe Relay Stuck ON (Initial 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 34-02 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. 14, No. 15, and No. 16 individually.

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

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.. Service and Repair