DTC Troubleshooting
DTC Troubleshooting: P1448 (63)
DTC P1448 (63):
IPU Module Fan Problem
NOTE: Before you troubleshoot, record all freeze data, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0A78 (32) indicated?
YES -
Do the troubleshooting for DTC P0A78 (32) P0A78.
NO -
Go to step 3.
3. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
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, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IPU module fan and the BCM module.�
5. Turn the ignition switch to LOCK (0).
6. Turn the battery module switch OFF High Voltage Safety.
7. Remove the IPU lid IPU Lid Removal/Installation.
8. Disconnect the IPU module fan 4P connector.
9. Disconnect BCM module connector A (40P).
10. Connect IPU module fan 4P connector terminal No. 3 to body ground with a jumper wire.
11. Check for continuity between BCM module connector terminal A30 and body ground.
Is there continuity?
YES -
Go to step 12.
NO -
Repair open in the wire between the IPU module fan and the BCM module (A30), then go to step 26.
12. Disconnect the jumper wire from the IPU module fan 4P connector.
13. Check for continuity between BCM module connector terminal A17 and body ground.
Is there continuity?
YES -
Repair short in the wire between the IPU module fan and the BCM module (A17), then go to step 26.
NO -
Go to step 14.
14. Connect IPU module fan 4P connector terminal No. 2 to body ground with a jumper wire.
15. Check for continuity between BCM module connector terminal A17 and body ground.
Is there continuity?
YES -
Go to step 16.
NO -
Repair open in the wire between the IPU module fan and the BCM module (A17), then go to step 26.
16. Disconnect the jumper wire from the IPU module fan 4P connector.
17. Check for continuity between IPU module fan 4P connector terminal No. 4 and body ground.
Is there continuity?
YES -
Go to step 18.
NO -
Repair open in the wire between the IPU module fan and G902, then go to step 26.
18. Reconnect BCM module connector A (40P).
19. Turn the ignition switch to ON (II).
20. Measure the voltage between IPU module fan 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to step 21.
NO -
Repair open in the wire between the IPU module fan and MCM relay 2, then go to step 25.
21. Turn the ignition switch to LOCK (0).
22. Connect IPU module fan 4P connector terminals No. 2 and No. 3 with a jumper wire.
23. Turn the ignition switch to ON (II).
24. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
Does the screen indicate OUT OF RANGE?
YES -
Go to step 32.
NO -
If screen indicates CONDITION IS NORMAL, replace the IPU module fan IPU Module Air Duct Removal/Installation, then go to step 25.
25. Turn the ignition switch to LOCK (0).
26. Reconnect all connectors.
27. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
28. Turn the ignition switch to ON (II).
29. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
30. 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 BCM module, then go to step 1.
NO -
Go to step 31.
31. 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 30, 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 BCM module, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
32. Turn the ignition switch to LOCK (0).
33. Reconnect all connectors.
34. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
35. Update the BCM module if it does not have the latest software Testing and Inspection, or substitute a known-good BCM module Initial Inspection and Diagnostic Overview.
36. 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 BCM module. If the BCM module was updated, substitute a known-good BCM module Initial Inspection and Diagnostic Overview, then recheck. If the BCM module was substituted, go to step 1.
NO -
Go to step 37.
37. Monitor the OBD STATUS for DTC P1448 (63) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the BCM module was updated, troubleshooting is complete. If the BCM module was substituted, replace the original BCM module Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 36, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at IPU module fan and the BCM module. If the BCM module was updated, substitute a known-good BCM module Initial Inspection and Diagnostic Overview, then recheck. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.