DTC U0029: F-CAN Circuit Malfunction (BUS OFF)
NOTE:
- 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 )
- 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 )
- Clear the DTCs with the HDS
- Turn the ignition switch to LOCK (0) and then back to ON (II)
- Wait for 6 seconds or more
- 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 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 disconnectedCONTROL UNIT CONNECTOR REFERENCE CHART
Control Unit Connector Gauge control module 32P connector ECM/PCM Connector A (49P) VSA modulator-control unit 32P connector SRS unit Connector A (39P) Navigation unit(1) 32P connector TPMS control unit 20P connector EPS control unit 28P connector Yaw rate-lateral acceleration sensor 4P connector AcuraLink control unit(2) Connector B(14P) (1) With navigation (2) With AcuraLink Is DTC U0029 indicated with each individual unit disconnected?
YES -Go to step 7
NO -Replace the control unit that was disconnected when DTC U0029 is not reset
- Turn the ignition switch to LOCK (0)
- Disconnect each control unit connectors in the tableCONTROL UNIT CONNECTOR REFERENCE CHART
Control Unit Connector Gauge control module 32P connector ECM/PCM Connector A (49P) VSA modulator-control unit 32P connector SRS unit Connector A (39P) Navigation unit(1) 32P connector TPMS control unit 20P connector EPS control unit 28P connector Yaw rate-lateral acceleration sensor 4P connector AcuraLink control unit(2) Connector B(14P) (1) With navigation (2) With AcuraLink - Disconnect the HDS from the data link connector
- Check for continuity between body ground and gauge control module 32P connector terminals No 21 and No 22 individuallyFig 1: Identifying Continuity Between Body Ground And Gauge Control Module 32P Connector Terminals No 21 And No 22
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 21 and No 22
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 )