DTC U0029: F-CAN Communication Line Error
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Make sure the HDS communicates with the ECM/PCM and other vehicle systems. If it does not, go to DLC Circuit Troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Wait for at least 6 seconds.
- Check for DTCs with the HDS.
Is DTC U0029 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition (see 12 VOLT BATTERY TEST ) and the charging system.
- Turn the ignition switch to LOCK (0).
- Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.CONTROL UNIT CONNECTOR REFERENCE
Control Unit Connector ECM/PCM Connector A (44P) SRS unit Connector A (39P) Gauge control module 32P connector VSA modulator-control unit 32P connector EPS control unit Connector A (11P) Yaw rate-acceleration sensor 4P connector Motor control module (MCM) Connector A (31P) TPMS control unit(1) 20P connector (1) With TPMS Is DTC U0029 indicated after each individual unit was disconnected?
YES -Go to step 7.
NO -Replace the control unit that was disconnected when DTC U0029 did not set.
- Turn the ignition switch to LOCK (0).
- Disconnect all the control unit connectors in the following table.CONTROL UNIT CONNECTOR REFERENCE
Control Unit Connector ECM/PCM Connector A (44P) SRS unit Connector A (39P) Gauge control module 32P connector VSA modulator-control unit 32P connector EPS control unit Connector A (11P) Yaw rate-acceleration sensor 4P connector Motor control module (MCM) Connector A (31P) TPMS control unit(1) 20P connector (1) With TPMS - Disconnect the HDS from the data link connector (DLC).
- Check for continuity between body ground and gauge control module 32P connector terminal No. 19.Fig 1: Checking Continuity Between Body Ground And Gauge Control Module 32P Connector Terminal No. 19
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to ground in the wire.
NO -Go to step 11.
- Check for continuity between gauge control module 32P connector terminals No. 19 and No. 20.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the F-CAN wires.
NO -Replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).