DTC Troubleshooting
DTC Troubleshooting: P1634 (47)
DTC P1634 (47):
Motor Power Inverter (MPI) Module Signal Circuit Malfunction
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If the DTC cannot be cleared, do the troubleshooting for DTC U1204 (55).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1634 (47) indicated?
YES -
Go to step 4.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM and the MPI module.�
4. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
Does the screen indicate OUT OF RANGE?
YES -
Go to step 5.
NO -
If the screen indicates CONDITION IS NORMAL, go to step 15.
5. Check the No. 53 +B IMA 2 (10 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to step 6.
NO -
Repair a short to ground in the wire between the IPU module fan or the MPI module and the No. 53 +B IMA 2 (10 A) fuse. Also replace the No. 53 +B IMA 2 (10 A) fuse, then go to step 40.
6. Turn the ignition switch to LOCK (0).
7. Turn the battery module switch OFF.
8. Remove the IPU cover IPU Cover Removal/Installation.
9. Turn the ignition switch to ON (II), and listen for a clicking sound from MCM relay 2 (A).
Is there a clicking sound?
YES -
Go to step 10.
NO -
Go to step 27.
10. Turn the ignition switch to LOCK (0).
11. Remove MCM relay 2.
12. Test MCM relay 2.
Is the relay OK?
YES -
Go to step 13.
NO -
Replace MCM relay 2, then go to step 40.
13. Turn the ignition switch to ON (II).
14. Measure the voltage between MCM relay 2 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES -
Repair an open in the wire between MCM relay 2 and the MPI module 12P connector terminal No. 12, then go to step 40.
NO -
Repair an open in the wire between the No. 53 +B IMA 2 (10 A) fuse and MCM relay 2, then go to step 40.
15. Turn the ignition switch to LOCK (0).
16. Turn the battery module switch OFF.
17. Remove the IPU cover IPU Cover Removal/Installation.
18. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
19. Disconnect MCM connector C (22P).
20. Measure the resistance between MCM connector terminal C20 and body ground.
Is there 1 MOhms or more?
YES -
Go to step 21.
NO -
Go to step 37.
21. Disconnect the MPI module 12P connector (A).
22. Reconnect MCM connector C (22P).
23. Turn the ignition switch to ON (II).
24. Measure the voltage between MPI module 12P connector terminals No. 7 and No. 12.
Is there battery voltage?
YES -
Go to step 25.
NO -
Go to step 39.
25. Measure the voltage between MPI module 12P connector terminal No. 5 and body ground.
Is there about 5 V?
YES -
Replace the MPI module Service and Repair, then go to step 40.
NO -
Go to step 26.
26. Measure the voltage between MCM connector terminal C20 and body ground.
Is there about 12 V?
YES -
Repair an open in the wire between the MPI module 12P connector and the MCM (C20), then go to step 40.
NO -
Go to step 47.
27. Turn the ignition switch to LOCK (0).
28. Remove MCM relay 2.
29. Test MCM relay 2.
Is the relay OK?
YES -
Go to step 30.
NO -
Replace MCM relay 2, then go to step 40.
30. Turn the ignition switch to ON (II).
31. Measure the voltage between MCM relay 2 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES -
Go to step 32.
NO -
Repair an open in the wire between MCM relay 1 and MCM relay 2, then go to step 40.
32. Turn the ignition switch to LOCK (0).
33. Reinstall MCM relay 2 (A).
34. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
35. Turn the ignition switch to ON (II).
36. Measure the voltage between MCM connector terminal A6 and body ground.
Is there battery voltage?
YES -
Go to step 47.
NO -
Repair an open in the wire between MCM relay 2 and the MCM (A6), then go to step 40.
37. Disconnect the MPI module 12P connector (A).
38. Check for continuity between MCM connector terminal C20 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the MPI module 12P connector and the MCM (C20), then go to step 40.
NO -
Replace the MPI module Service and Repair, then go to step 40.
39. Measure the voltage between MPI module 12P connector terminal No. 12 and body ground.
Is there battery voltage?
YES -
Repair an open in the wire between the MPI module 12P connector terminal No. 7 and G901, then go to step 40.
NO -
Repair an open in the wire between MCM relay 2 and the MPI module 12P connector terminal No. 12, then go to step 40.
40. Reconnect all connectors.
41. If removed, reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
42. If removed, reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
43. Turn the ignition switch to ON (II).
44. Clear the DTC with the HDS.
45. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1634 (47) indicated?
YES -
Check for poor connections or loose terminals at the MCM and the MPI module, then go to step 1.
NO -
Go to step 46.
46. Monitor the OBD STATUS for DTC P1634 (47) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 45, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the MCM and the MPI module, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
47. Reconnect all connectors.
48. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
49. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
50. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
51. Turn the ignition switch to ON (II).
52. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1634 (47) indicated?
YES -
Check for poor connections or loose terminals at the MCM and the MPI module. If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1.
NO -
Go to step 53.
53. Monitor the OBD STATUS for DTC P1634 (47) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 52, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the MCM and the MPI module. If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.