86-1

VSA DTC Troubleshooting: 86

DTC 86:

F-CAN Communication Malfunction

NOTE:

- Check for fuel and emissions systems DTCs Initial Inspection and Diagnostic Overview. If there are DTCs present, troubleshoot them first.
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

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. Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.

4. Check for DTCs with the HDS.

Is DTC 86 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose terminals between the PCM connector A (49P) and the VSA modulator-control unit 46P connector. Refer to intermittent failures troubleshooting.�

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

6. Short the SCS line with the HDS.

7. Disconnect the PCM connector A (49P) Service and Repair.

8. Disconnect the VSA modulator-control unit 46P connector.

9. Check for continuity between VSA modulator-control unit 46P connector terminals No. 38 and No. 39, and PCM connector A (49P) terminals No. 49 and No. 48 individually.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire between the PCM 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, or select the OFF mode, then the ON mode.

13. Check for DTCs with the HDS.

Is DTC 86 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 46P 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.�