DTC Troubleshooting: 51-12

DTC 51-12:  Motor Lock Circuit Malfunction

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Turn the ignition switch OFF, then turn it ON (II) again.

4.Check for DTCs with the HDS.

Is DTC 51-12 indicated?


YES - Go to 5.


NO - Intermittent failure, the system is OK at this time. Check for loose terminals at the ABS modulator-control unit 25P connector. Refer to intermittent failures troubleshooting.n


5.Turn the ignition switch OFF.

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

Is the fuse blown?


YES - Go to 7.


NO - Reinstall the checked fuse, then go to 9.


7.Disconnect the ABS modulator-control unit 25P connector.

8.Check for continuity between ABS modulator-control unit 25P connector terminal No. 9 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the No. 3 MTR (30 A) fuse and the ABS modulator-control unit.n


NO - Install the new No. 3 MTR (30 A) fuse, then go to 10.


9.Disconnect the ABS modulator-control unit 25P connector.

10.Measure voltage between ABS modulator-control unit 25P connector terminal No. 9 and body ground.

 

Is there battery voltage?


YES - Check for loose terminals in the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit and retest: Except K20Z2 engine model, K20Z2 engine model.n


NO - Repair open in the wire between the No. 3 MTR (30 A) fuse and the ABS modulator-control unit.n