Manufacturer Code Charts: 85

TPMS DTC Troubleshooting: 85

DTC 85:

F-CAN Communication Failure

NOTE: Check for PGM-FI DTCs with the HDS, and troubleshoot the ECM/PCM and F-CAN communication errors first How to Troubleshoot the Fuel and Emissions Systems.

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

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0), and then back to ON (II).

4. Wait about 5 seconds.

5. Check for DTCs with the HDS.

Is DTC 85 indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the system is OK at this time.

6. Test-drive the vehicle.

Does the speedometer work?

YES -

Go to step 10.

NO -

Go to step 7.

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

8. Disconnect the TPMS control unit 20P connector.

9. Test-drive the vehicle.

Does the speedometer work?

YES -

Check for loose terminals and poor connections at the TPMS control unit. If necessary, substitute a known-good TPMS control unit Service and Repair, and recheck.

NO -

Turn the ignition switch to LOCK (0), and reconnect all connectors, then check and troubleshoot the PGM-FI system How to Troubleshoot the Fuel and Emissions Systems.

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

11. Short the SCS line with the HDS.

12. Disconnect ECM/PCM connector A (49P).

13. Disconnect the TPMS control unit 20P connector.

14. Check for continuity between the TPMS control unit 20P connector terminals and the ECM/PCM connector A (49P) terminals according to the table.









Is there continuity?

YES -

Check for loose terminals and poor connections at the TPMS control unit and G503. If necessary, substitute a known-good TPMS control unit Service and Repair, and recheck.

NO -

Repair an open in the appropriate wire between the TPMS control unit and the ECM/PCM.