DTC 41-1

DTC 41-1: CAN Communication (PCM/ VSA System)
1. Clear the DTC.
2. Test-drive the vehicle, and watch the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES - Go to step 3.
NO - The system is OK at this time.
3. Connect the HDS to the 16P Data Link Connector (DLC), and check for a PCM/VSA system DTC.
Is there a DTC?
YES - Troubleshoot the PCM/VSA system for the cause of the DTC.
NO - Go to step 4.
4. Disconnect connector A (22P) from the VTM-4 control unit, connector B (56P) from the PCM, the 47P connector from the VSA control unit, and connector A (20P) from the navigation unit.
5. Turn the ignition switch ON (II).





6. Measure the voltage between the A11 terminal of the VTM-4 control unit and body ground.
Is there voltage?
YES - Repair short to power in the wire between the A11 terminal of the VTM-4 control unit and the B16 terminal of the PCM, the 14 terminal of the VSA control unit, the A8 terminal of the navigation unit.
NO - Go to step 7.
7. Turn the ignition switch OFF.





8. Check for continuity between the A11 terminal of the VTM-4 control unit and body ground.
Is there continuity ?
YES - Repair short to ground in the wire between the A11 terminal of the VTM-4 control unit and the B16 terminal of the PCM, the 14 terminal of the VSA control unit, the A8 terminal of the navigation unit.
NO - Go to step 9.














9. Connect the A11 terminal of the VTM-4 control unit connector A (22P) to body ground with a jumper wire, then check for continuity between the B16 terminal of the PCM, the 14 terminal of the VSA control unit, the A8 terminal of the navigation unit and body ground.
Is there continuity ?
YES - Go to step 10.
NO - Repair open in the wire between the A11 terminal of the VTM-4 control unit and B16 terminal of the PCM, the 14 terminal of the VSA control unit, the A8 terminal of the navigation unit.
10. Disconnect the A (22P) connector from the VTM-4 control unit, the B (56P) connector from the PCM, the 47P connector from the VSA control unit, and the A (20P) connector from the navigation unit.
11. Turn the ignition switch ON (II).





12. Measure the voltage between the A22 terminal of the VTM-4 control unit and body ground.
Is there voltage?
YES - Repair short to power in the wire between the A22 terminal of the VTM-4 control unit and the B15 terminal of the PCM, the 30 terminal of the VSA control unit, the A18 terminal of the navigation unit.
NO - Go to step 13.
13. Turn the ignition switch OFF.





14. Check for continuity between the A22 terminal of the VTM-4 control unit and body ground.
Is there continuity ?
YES - Repair short to ground in the wire between the A22 terminal of the VTM-4 control unit and the B15 terminal of the PCM, the 30 terminal of the VSA control unit, the A18 terminal of the navigation unit.
NO - Go to step 15.














15. Connect the A22 terminal of the VTM-4 control unit connector A (22P) to body ground with a jumper wire, then check for continuity between the B15 terminal of the PCM, the 30 terminal of the VSA control unit, the A18 terminal of the navigation unit and body ground.
Is there continuity ?
YES - Go to step 16.
NO - Repair open in the wire between the A22 terminal of the VTM-4 control unit and B15 terminal of the PCM, the 30 terminal of the VSA control unit, the A18 terminal of the navigation unit.
16. Check for loose terminal fit in the VTM-4 control unit, PCM, VSA, navigation connectors. If it is normal, replace the VTM-4 control unit. Test-drive the vehicle, and watch the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES - Go to step 17.
NO - The system is OK at this time.
17. Watch the ABS indicator.
Does the ABS indicator come on?
YES - Check the VSA system.
NO - Go to step 18.
18. Connect the HDS to the 16P Data Link Connector (DLC), and check for the PCM system DTC.
Is there the DTC?
YES - Check the PCM system.
NO - Check the navigation system..