Manufacturer Code Charts: 85

TPMS DTC Troubleshooting: 85

DTC 85:

F-CAN Communication Failure

NOTE: Check the fuel and emission systems DTCs with the HDS, and troubleshoot the PCM and F-CAN communication errors first Initial Inspection and Diagnostic Overview.

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 the ignition switch to ON (II) again.

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. Refer to intermittent failures troubleshooting.

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 TPMS control unit connector B (20P) Service and Repair.

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 fuel and emissions systems Initial Inspection and Diagnostic Overview.

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

11. Short the SCS line with the HDS.

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

13. Disconnect TPMS control unit connector B (20P) Service and Repair.

14. Check for continuity between TPMS control unit connector B (20P) terminal and PCM connector A (49P) terminal (see table).









Is there continuity?

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 -

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