DTC 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.

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 - 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, and recheck.

NO - Turn the ignition switch to LOCK (0), and reconnect all the connectors, then check and troubleshoot the fuel and emissions system.

10. Turn the ignition switch to LOCK (0).
11. Short the SCS line with the HDS.
12. Disconnect PCM connector A (44P).
13. Disconnect the TPMS control unit 20P connector.
14. Check for continuity between the TPMS control unit 20P connector terminals and the PCM connector A (44P) terminals individually (see table).





Is there continuity?

YES - Check for loose terminals and poor connections at the TPMS control unit and G504. If necessary, substitute a known-good TPMS control unit, and recheck.

NO - Repair open in the wire between the TPMS control unit and the PCM.