DTC 85: F-CAN Communication Error
- Turn the ignition switch ON (II).
- Check for DTCs in the ECM/PCM with the HDS.
Are there any DTCs indicated?
YES - Go to the indicated ECM/PCM troubleshooting.
NO - Go to step 3.
- Clear the DTC with the HDS.
- Turn the ignition switch OFF, then turn the ignition switch ON (II) again.
- Wait about 5 seconds.
- Check for DTCs with the HDS.
Is DTC 85 indicated?
YES - Go to step 7.
NO - The system is OK at this time.
- Test-drive the vehicle.
Does the speedometer work?
YES - Go to step 11.
NO - Go to step 8.
- Turn the ignition switch OFF.
- Disconnect the TPMS control unit 20P connector.
- 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 (see TPMS CONTROL UNIT REPLACEMENT ), and recheck.
NO - Substitute a known-good ECM/PCM and recheck.
- Turn the ignition switch OFF.
- Short the SCS line with the HDS.
- Disconnect ECM/PCM connector E (31P).
- Disconnect the TPMS control unit 20P connector.
- Check for continuity between the TPMS control unit 20P connector terminals and ECM/PCM connector E (31P) terminals individually, (see table).CONNECTOR TERMINAL REFERENCE
Terminal name TPMS control unit terminal ECM/PCM E terminal CANL No. 11 No. 24 CANH No. 1 No. 11 Fig 1: Checking Continuity Between TPMS Control Unit 20P Connector Terminals And ECM/PCM Connector E (31P) TerminalsCourtesy of AMERICAN HONDA MOTOR CO., INC.
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 (see TPMS CONTROL UNIT REPLACEMENT ), and recheck.
NO - Repair open in the wire between TPMS control unit and the ECM/PCM.