86-51

VSA DTC Troubleshooting: 86-51

DTC 86-51:

F-CAN Communication with VTM-4 Malfunction

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.

4. Check for DTCs with the HDS.

Is DTC 86-51 indicated?

YES -

If DTC 86-01 is indicated at the same time, do the DTC 86-01 troubleshooting first 86-01. If the DTC 86-01 is not indicated, go to step 5.

NO -

If any other DTCs are indicated, go to the indicated DTCs troubleshooting. If DTCs are not indicated, there was an intermittent failure, the system is OK at this time. Check for loose terminals between the VTM-4 control unit connector A (22P) and the VSA modulator-control unit 36P connector. Refer to intermittent failures troubleshooting.�

5. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.

Does the VTM-4 indicator come on and stay on?

YES -

Do the VTM-4 troubleshooting Initial Inspection and Diagnostic Overview.�

NO -

Go to step 6.

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

7. Disconnect VTM-4 control unit connector A (22P).

8. Disconnect the VSA modulator-control unit 36P connector.

9. Check for continuity between the VSA modulator-control unit 36P connector terminal and VTM-4 control unit connector A (22P) terminal (see table).









Is there continuity?

YES -

Check for loose terminals in the VTM-4 control unit connector A (22P). If necessary, substitute a known-good VTM-4 control unit Service and Repair, then go to step 1, and recheck. If no DTCs are indicated, replace the VTM-4 control unit Service and Repair. If DTC 86-51 resets, go to step 10.

NO -

Repair open in the wire between the VTM-4 control unit and the VSA modulator-control unit.�

10. Reconnect all connectors.

11. 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.

12. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.

13. Check for DTCs with the HDS.

Is DTC 86-51 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 36P 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.�