DTC Troubleshooting
DTC Troubleshooting: P0AC8 (52)
DTC P0AC8 (52):
Battery Module Temperature Sensor 2 Circuit High Voltage
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 the IMA BATTERY MODULE TEMPERATURE SENSOR 2 VOLTAGE (IMA BATTERY MODULE TEMPERATURE SENSOR 2) in the DATA LIST with the HDS.
Is about 4.95 V or more (-40 °F (-40 °C) or less) indicated?
YES -
Go to step 3.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the battery module and the BCM module.�
3. Check for Pending or Confirmed DTCs with the HDS.
Are DTC P0A9E (50), P0AC8 (52), and P0ACD (54) indicated at the same time?
YES -
Go to step 14.
NO -
Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Turn the battery module switch OFF High Voltage Safety.
6. Remove the IPU lid IPU Lid Removal/Installation.
7. Disconnect the junction board 12P connector.
8. Connect junction board 12P connector terminal No. 11 to body ground with a jumper wire.
9. Turn the ignition switch to ON (II).
10. Check the IMA BATTERY MODULE TEMPERATURE SENSOR 2 VOLTAGE (IMA BATTERY MODULE TEMPERATURE SENSOR 2) in the DATA LIST with the HDS.
Is about 4.95 V or more (-40 °F (-40 °C) or less) indicated?
YES -
Go to step 11.
NO -
Replace the battery module Service and Repair, then go to step 24.
11. Turn the ignition switch to LOCK (0).
12. Disconnect BCM module connector A (40P).
13. Check for continuity between BCM module connector terminal A34 and junction board 12P connector terminal No. 11.
Is there continuity?
YES -
Go to step 31.
NO -
Repair open in the wire between the battery module and the BCM module (A34), then go to step 24.
14. Turn the ignition switch to LOCK (0).
15. Turn the battery module switch OFF High Voltage Safety.
16. Remove the IPU lid IPU Lid Removal/Installation.
17. Connect junction board 12P connector terminal No. 10 to body ground with a jumper wire.
18. Turn the ignition switch to ON (II).
19. Check the IMA BATTERY MODULE TEMPERATURE SENSOR 1 VOLTAGE (IMA BATTERY MODULE TEMPERATURE SENSOR 1), the IMA BATTERY MODULE TEMPERATURE SENSOR 2 VOLTAGE (IMA BATTERY MODULE TEMPERATURE SENSOR 2), and the IMA BATTERY MODULE TEMPERATURE SENSOR 3 VOLTAGE (IMA BATTERY MODULE TEMPERATURE SENSOR 3) in the DATA LIST with the HDS.
Do all sensors indicate about 4.95 V or more (-40 °F(-40 °C) or less)?
YES -
Replace the battery module Service and Repair, then go to step 24.
NO -
Go to step 20.
20. Turn the ignition switch to LOCK (0).
21. Disconnect the junction board 12P connector.
22. Disconnect BCM module connector A (40P).
23. Check for continuity between BCM module connector terminal A6 and junction board 12P connector terminal No. 10.
Is there continuity?
YES -
Go to step 31.
NO -
Repair open in the wire between the battery module and the BCM module (A6), then go to step 24.
24. Turn the ignition switch to LOCK (0).
25. Reconnect all connectors.
26. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
27. Turn the ignition switch to ON (II).
28. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
29. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AC8 (52) 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 30.
30. Monitor the OBD STATUS for DTC P0AC8 (52) 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 29, 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, keep the ignition switch ON (II) until a result comes on.
31. Reconnect all connectors.
32. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
33. 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.
34. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AC8 (52) 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 recheck. If the BCM module was substituted, go to step 1.
NO -
Go to step 35.
35. Monitor the OBD STATUS for DTC P0AC8 (52) 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 34, 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 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.