DTC 4

DTC 4: Upper FET Stuck ON
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Turn the steering wheel from lock-to-lock several times, and wait 10 seconds or more.
5. Check for DTCs with the HDS.
Is DTC 4 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 OFF.
7. Disconnect EPS control unit connector B (2P).
8. Check for continuity between EPS control unit connector B (2P) terminal No. 2 and body ground.





Is there continuity?
YES - Check for poor connections or loose terminals at the EPS control unit. If necessary, substitute a known-good EPS control unit and recheck.
NO - Repair open in the wire between the EPS control unit and body ground (G352).