86-31

VSA DTC Troubleshooting: 86-31

DTC 86-31:

F-CAN Communication With Gauge Control Module Malfunction

NOTE: Troubleshoot the fuel and emissions DTCs first.

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 86-31 indicated?

YES -

If the DTC 86-01 is indicated at the same time, do the DTC 86-01 troubleshooting VSA System. 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, intermittent failure, the system is OK at this time. Check for loose terminals between the gauge control module 32P connector and the VSA modulator-control unit 36P connector. Refer to intermittent failures troubleshooting.�

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

Do the gauge indicators come on?

YES -

Go to step 6.

NO -

Do the gauge control module troubleshooting Initial Inspection and Diagnostic Overview.�

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

7. Disconnect the gauge control module 32P connector.

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

9. Check for continuity between the VSA modulator-control unit 36P connector terminal and gauge control module 32P connector terminal (see table).









Is there continuity?

YES -

Check for loose terminals in the gauge control module 32P connector. If necessary, substitute a known-good gauge control module, then go to step 1 and recheck. If no DTCs are indicated, replace the original gauge control module Service and Repair. If DTC 86-31 resets, go to step 10.

NO -

Repair an open in the wire between the gauge control module 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 86-31 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.�