DTC Troubleshooting
DTC Troubleshooting: P1446 (74)
DTC P1446 (74):
Battery Module Individual Voltage Input Deviation
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 P0A7F (78) indicated?
YES -
Do the troubleshooting for DTC P0A7F (78) P0A7F.
NO -
Go to step 3.
3. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
4. Start the engine, and wait for 1 minute.
5. Monitor the OBD STATUS for DTC P1446 (74) in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES -
Go to step 6.
NO -
If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the battery module and the BCM module. If the screen indicates NOT COMPLETED, go to step 1.
6. Record the value of the IMA BATTERY MODULE 1 VOLTAGE through the IMA BATTERY MODULE 11 VOLTAGE in the DATA LIST with the HDS.
7. Turn the ignition switch to LOCK (0).
8. Turn the battery module switch OFF High Voltage Safety.
9. Remove the IPU lid IPU Lid Removal/Installation.
10. Disconnect BCM module connector B (14P).
11. Using the IMA BATTERY MODULE VOLTAGES you noted in step 6, compare the voltages between the following BCM module connector terminals and the listed IMA BATTERY MODULE VOLTAGES in the DATA LIST with the HDS.
- B6 and B14, compared to IMA BATTERY MODULE 1 VOLTAGE
- B14 and B5, compared to IMA BATTERY MODULE 2 VOLTAGE
- B5 and B13, compared to IMA BATTERY MODULE 3 VOLTAGE
- B13 and B4, compared to IMA BATTERY MODULE 4 VOLTAGE
- B4 and B12, compared to IMA BATTERY MODULE 5 VOLTAGE
- B12 and B11, compared to IMA BATTERY MODULE 6 VOLTAGE
- B7 and B1, compared to IMA BATTERY MODULE 7 VOLTAGE
- B1 and B8, compared to IMA BATTERY MODULE 8 VOLTAGE
- B8 and B2, compared to IMA BATTERY MODULE 9 VOLTAGE
- B2 and B9, compared to IMA BATTERY MODULE 10 VOLTAGE
- B9 and B3, compared to IMA BATTERY MODULE 11 VOLTAGE
Is there more than 1 V difference between the BCM module measurements and the DATA LIST measurements?
YES -
Go to step 20.
NO -
Replace the battery module Service and Repair, then go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Reconnect all connectors.
14. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
15. Turn the ignition switch to ON (II).
16. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
17. Start the engine, and wait for 1 minute.
18. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1446 (74) indicated?
YES -
Check for poor connections or loose terminals at the battery module and the BCM module, then go to step 1.
NO -
Go to step 19.
19. Monitor the OBD STATUS for DTC P1446 (74) 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 18, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the battery module and the BCM module, then go to step 1. If the screen indicates NOT COMPLETED, go to step 17.
20. Turn the ignition switch to LOCK (0).
21. Reconnect all connectors.
22. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
23. 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.
24. Start the engine, and wait for 1 minute.
25. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1446 (74) indicated?
YES -
Check for poor connections or loose terminals at the battery module and the BCM module. If the BCM module was updated, substitute a known-good BCM module Initial Inspection and Diagnostic Overview, then go to step 24. If the BCM module was substituted, go to step 1.
NO -
Go to step 26.
26. Monitor the OBD STATUS for DTC P1446 (74) 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 25, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the battery module and the BCM module. If the BCM module was updated, substitute a known-good BCM module Initial Inspection and Diagnostic Overview, then go to step 24. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 24.