Manufacturer Code Charts: 54

VSA DTC Troubleshooting: 54

DTC 54:

Fail-Safe Relay Malfunction

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

2. Clear the DTC with the HDS.

3. Test-drive the vehicle at 19 mph (30 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

4. Check for DTCs with the HDS.

Is DTC 54 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.�

5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6. Check the No. 2-3 (30 A) fuse in the under-hood fuse/relay box.

Is the fuse blown?

YES -

Go to step 7.

NO -

Reinstall the checked fuse, then go to step 14.

7. Disconnect the VSA modulator-control unit 47P connector.

8. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.�

NO -

Install a new No. 2-3 (30 A) fuse in the under-hood fuse/relay box, then go to step 9.

9. Reconnect the VSA modulator-control unit 47P connector.

10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

11. Clear the DTC with the HDS.

12. Test-drive the vehicle at 19 mph (30 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

13. Check for DTCs with the HDS.

Is DTC 54 indicated?

YES -

Replace the VSA modulator-control unit Service and Repair.�

NO -

Troubleshooting is complete.�

14. Disconnect the VSA modulator-control unit 47P connector.

15. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 32 and body ground.





Is there battery voltage?

YES -

Go to step 16.

NO -

Repair an open in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.�

16. Reconnect the VSA modulator-control unit 47P connector.

17. Update the VSA modulator-control unit if it does not have the latest software Testing and Inspection. If the unit already has the latest software, substitute a known-good VSA modulator-control unit Service and Repair.

18. Test-drive the vehicle at 19 mph (30 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

19. Check for DTCs with the HDS.

Is DTC 54 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit Service and Repair, then retest. If the VSA modulator-control unit was substituted, go to step 1.

NO -

If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit Service and Repair. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.�