DTC 85: F-CAN Communication Failure
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
- Wait about 5 seconds.
- 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.
- Test-drive the vehicle.
Does the speedometer work?
YES -Go to step 10.
NO -Go to step 7.
- Turn the ignition switch to LOCK (0).
- Disconnect the TPMS control unit 20P connector (see step 3 ).
- 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 -Turn the ignition switch to LOCK (0), and reconnect all connectors, then check and troubleshoot the fuel and emissions systems (see GENERAL TROUBLESHOOTING INFORMATION ).
- Turn the ignition switch to LOCK (0).
- Short the SCS line with the HDS.
- Disconnect ECM/PCM connector A (44P) (see step 14 on ECM/PCM REPLACEMENT ).
- Disconnect the TPMS control unit 20P connector (see step 3 ).
- Check for continuity between TPMS control unit 20P connector terminals and ECM/PCM connector A (44P) terminals individually (see table).CONNECTOR TERMINAL REFERENCE CHART
Terminal Name TPMS Control Unit 20P Connector Terminal ECM/PCM Connector A (44P) Terminal F-CAN L No. 20 No. 37 F-CAN H No. 9 No. 36 Fig 1: Checking Continuity Between TPMS Control Unit 20P Connector Terminals And ECM/PCM Connector A (44P) TerminalsCourtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose terminals and poor connections at the TPMS control unit and G502. If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT ), and recheck.
NO -Repair an open in the wire between the TPMS control unit and the ECM/PCM.