U0073
DTC U0073: FCAN Malfunction (Bus-off)NOTE: If DTC U0114 and/or U0122 are stored at the same time as DTC U0073, troubleshoot DTC U0073 first, then recheck for DTC U0114 and/or U0122.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0073 indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTM-4 control unit, the VSA control unit, the navigation unit, and the PCM.
4. Turn the ignition switch OFF.
5. Jump the SCS line with the HDS.
6. Disconnect PCM connector B (56P).
7. Measure resistance between PCM connector terminals B15 and B16.
Is there about 54 - 66 Ohms ?
YES - Go to step 21.
NO - Go to step 8.
8. Check the resistance again.
Is there 54 - 66 Ohms or less?
YES - Repair OPEN in the wire between PCM terminals B15 and B16, then go to step 47.
NO - Go to step 9.
9. Disconnect the navigation unit 20P connector.
10. Disconnect the VTM-4 control unit 22P connector.
11. Measure resistance between VSA control unit 47P connector terminals No.14 and No.30.
Is there about 108 - 132 Ohms ?
YES - Go to step 12.
NO - Substitute a known-good VSA control unit, then go to step 47 and recheck. If no DTC is indicated, replace the original VSA control unit, then go to step 47.
12. Disconnect the VSA control unit 47P connector.
13. Reconnect the VTM-4 control unit 22P connector.
14. Measure resistance between VTM-4 control unit 22P connector terminals No.11 and No.22.
Is there about 108 - 132 Ohms ?
YES - Go to step 15.
NO - Substitute a known-good VTM-4 control unit, then go to step 47, and recheck If no DTC is indicated, replace the original VTM-4 control unit, then go to step 47.
15. Disconnect the VTM-4 control unit 22P connector.
16. Reconnect the navigation unit 20P connector.
17. Measure resistance between navigation unit 20P connector terminals No.8 and No.18.
Is there about 2.6 kOhms ?
YES - Go to step 18.
NO - Substitute a known-good navigation unit, then go to step 47, and recheck. If no DTC is indicated, replace the original navigation unit, then go to step 47.
18. Disconnect the navigation unit 20P connector.
19. Reconnect PCM connector B (56P).
20. Measure resistance between PCM connector terminals B15 and B16
Is there about 2.6 kOhms ?
YES -
- Repair open in the wire between the VTM-4 control unit 22P connector (No.11 (No.22)*) and the PCM (B16 (B15)*), then go to step 47.
- Repair open in the wire between the navigation unit 20P connector (No.8 (No.18)*) and the PCM (B16 (B15)*), then go to step 47.
- Repair open in the wire between the VSA control unit (No.14 (No.30)*) and the PCM (B16 (B15)*), then go to step 47.
*: CANL line
NO - Go to step 52.
21. Disconnect the VSA control unit 47P connector.
22. Check for continuity between VSA control unit 47P connector terminal No.32 and body ground.
Is there continuity?
YES - Go to step 23.
NO - Repair open in the wire between the VSA control unit and G302, then go to step 47.
23. Disconnect the VTM-4 control unit 22P connector.
24. Check for continuity between VTM-4 control unit 22P connector terminal No.10 and body ground.
Is there continuity?
YES - Go to step 25.
NO - Repair open in the wire between the VTM-4 control unit and G652, then go to step 47.
25. Disconnect the navigation unit 8P connector.
26. Check for continuity between navigation unit 8P connector terminal No.4 and body ground.
Is there continuity?
YES - Go to step 27.
NO - Repair open in the wire between the navigation unit and G502, then go to step 47.
27. Disconnect the navigation unit 20P connector.
28. Check for continuity between PCM connector terminals B15 and B16 and body ground individually.
Is there continuity?
YES - Repair short in the wire between the VSA control unit, the VTM-4 control unit, the navigation unit, and the PCM (B16 (B15)*), then go to step 47.
*:CANL line
NO - Go to step 29.
29. Reconnect PCM connector B (56P).
30. Reconnect the VTM-4 control unit 22P connector.
31. Reconnect the navigation unit 20P connector and 8P connector.
32. Turn the ignition switch ON (II).
33. Clear the DTC with the HDS.
34. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0073 indicated?
YES - Go to step 35.
NO - Substitute a known-good VSA control unit, then go to step 47, and recheck. If no DTC is indicated, replace the original VSA control unit, then go to step 4.
35. Turn the ignition switch OFF.
36. Reconnect the VSA control unit 47P connector.
37. Disconnect the VTM-4 control unit 22P connector.
38. Turn the ignition switch ON (II).
39. Clear the DTC with the HDS.
40. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0073 indicated?
YES - Go to step 41.
NO - Substitute a known-good VTM-4 control unit, then go to step 47, and recheck. If no DTC is indicated, replace the original VTM-4 control unit, then go to step 47.
41. Turn the ignition switch OFF.
42. Reconnect the VTM-4 control unit 22P connector.
43. Disconnect the navigation unit 20P connector.
44. Turn the ignition switch ON (II).
45. Clear the DTC with the HDS.
46. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0073 indicated?
YES - Go to step 52.
NO - Substitute a known-good navigation unit, then go to step 47, and recheck. If no DTC is indicated, replace the original navigation unit, then go to step 47.
47. Reconnect all the connectors.
48. Turn the ignition switch ON (II).
49. Reset the PCM with the HDS.
50. Do the PCM idle learn procedure.
51. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC U0073 is indicated, check for poor connections or loose terminals at the VTM-4 control unit, the navigation unit and the PCM, then go to step 1. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.
52. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
53. Do the PCM idle learn procedure.
54. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC U0073 is indicated, check for poor connections or loose terminals at the VTM-4 control unit, the navigation unit, and the PCM, then go to step 1. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.