EPS

EPS DTC Troubleshooting: 4

DTC 4: Upper FET Stuck ON

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.

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 4 indicated?
YES - Go to step 6.

NO - Troubleshoot the indicated DTC.


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

7. Disconnect EPS control unit connector C (2P).

8. Check for continuity between EPS control unit connector C (2P) terminal No. 1 and body ground.

Is there continuity?
YES - Check for loose EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.

NO - Repair open in the wire between the EPS control unit and the body ground (G351).