DTC Troubleshooting
DTC Troubleshooting: P1448 (63)
DTC P1448 (63):
Intelligent Power Unit (IPU) Module Fan Problem
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. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1448 (63) indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time.�
5. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1634 (47) indicated?
YES -
Do the troubleshooting for DTC P1634 (47) P1634.
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Remove the right cargo area side trim panel Interior Trim Removal/Installation - Cargo Areas.
8. Disconnect the IPU module fan 4P connector.
9. Turn the ignition switch to ON (II).
10. Measure the voltage between IPU module fan 4P connector terminals No. 1 and No. 4.
Is there battery voltage?
YES -
Go to step 11.
NO -
Go to step 22.
11. Measure the voltage between IPU module fan 4P connector terminals No. 2 and No. 4.
Is there about 5 V?
YES -
Go to step 12.
NO -
Go to step 23.
12. Reconnect the IPU module fan 4P connector.
13. Measure the voltage between IPU module fan 4P connector terminals No. 3 and No. 4.
Is there battery voltage?
YES -
Go to step 14.
NO -
Replace the IPU module fan Service and Repair, then go to step 30.
14. Turn the ignition switch to LOCK (0).
15. Disconnect the IPU module fan 4P connector.
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 A (31P).
20. Check for continuity between MCM connector terminal A28 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the IPU module fan and the MCM (A28), then go to step 30.
NO -
Go to step 21.
21. Check for continuity between IPU module fan 4P connector terminal No. 3 and MCM connector terminal A28.
Is there continuity?
YES -
Go to step 40.
NO -
Repair an open in the wire between the IPU module fan and the MCM (A28), then go to step 30.
22. Measure the voltage between IPU module fan 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Repair an open in the wire between the IPU module fan and G701, then go to step 30.
NO -
Repair an open in the wire between the IPU module fan and MCM relay 2, then go to step 30.
23. Turn the ignition switch to LOCK (0).
24. Turn the battery module switch OFF.
25. Remove the IPU cover IPU Cover Removal/Installation.
26. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
27. Disconnect MCM connector B (24P).
28. Check for continuity between MCM connector terminal B7 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the IPU module fan and the MCM (B7), then go to step 30.
NO -
Go to step 29.
29. Check for continuity between MCM connector terminal B7 and IPU module fan 4P connector terminal No. 2.
Is there continuity?
YES -
Go to step 40.
NO -
Repair an open in the wire between the IPU module fan and the MCM (B7), then go to step 30.
30. Turn the ignition switch to LOCK (0).
31. Reconnect all connectors.
32. If removed, reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
33. If removed, reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
34. Reinstall the right cargo area side trim panel Interior Trim Removal/Installation - Cargo Areas.
35. Turn the ignition switch to ON (II).
36. Clear the DTC with the HDS.
37. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
38. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1448 (63) indicated?
YES -
Check for poor connections or loose terminals at the IPU module fan and the MCM, then go to step 1.
NO -
Go to step 39.
39. Monitor the OBD STATUS for DTC P1448 (63) 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 38, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the IPU module fan and the MCM, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
40. Turn the ignition switch to LOCK (0).
41. Reconnect all connectors.
42. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
43. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
44. Reinstall the right cargo area side trim panel Interior Trim Removal/Installation - Cargo Areas.
45. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
46. Turn the ignition switch to ON (II).
47. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
48. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1448 (63) indicated?
YES -
Check for poor connections or loose terminals at the IPU module fan and the MCM. 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 49.
49. Monitor the OBD STATUS for DTC P1448 (63) 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 48, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the IPU module fan and the MCM. 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.