DTC Troubleshooting
DTC Troubleshooting: P0AC1 (115)
DTC P0AC1:
Battery Current Sensor 1 Circuit Low Voltage
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.
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 P0AC1 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 battery current sensor.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P06B1 indicated?
YES -
Do the troubleshooting for DTC P06B1 DTC Troubleshooting.
NO -
Go to step 5.
5. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0B10 indicated?
YES -
Go to step 6.
NO -
Go to step 14.
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. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
10. Disconnect MCM connector B (24P).
11. Remove the IPU case.
12. Disconnect the battery current sensor 4P connector (A).
13. Check for continuity between battery current sensor 4P connector terminal No. 4 and MCM connector terminal B24.
Is there continuity?
YES -
Replace the battery module Service and Repair, then go to step 33.
NO -
Repair an open in the wire between the battery current sensor and the MCM (B24), then go to step 33.
14. Turn the ignition switch to LOCK (0).
15. Turn the battery module switch OFF.
16. Remove the IPU cover IPU Cover Removal/Installation.
17. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
18. Disconnect MCM connector B (24P).
19. Check for continuity between body ground and MCM connector terminal B5.
Is there continuity?
YES -
Go to step 20.
NO -
Go to step 23.
20. Remove the IPU case IPU Case Removal/Installation.
21. Disconnect the battery current sensor 4P connector (A).
22. Check for continuity between body ground and battery current sensor 4P connector terminal No. 1.
Is there continuity?
YES -
Repair a short in the wire between the battery current sensor and the MCM (B5), then go to step 33.
NO -
Replace the battery module Service and Repair, then go to step 33.
23. Reconnect MCM connector B (24P).
24. Connect MCM connector terminals B5 and B24 with a jumper wire.
25. Turn the ignition switch to ON (II).
26. Clear the DTC with the HDS.
27. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AC2 indicated?
YES -
Go to step 28.
NO -
Go to step 41.
28. Turn the ignition switch to LOCK (0).
29. Disconnect MCM connector B (24P).
30. Remove the IPU case IPU Case Removal/Installation.
31. Disconnect the battery current sensor 4P connector (A).
32. Check for continuity between battery current sensor 4P connector terminal No. 1 and MCM connector terminal B5.
Is there continuity?
YES -
Replace the battery module Service and Repair, then go to step 33.
NO -
Repair an open in the wire between the battery current sensor and the MCM (B5), then go to step 33.
33. Reconnect all connectors.
34. Reinstall the IPU case IPU Case Removal/Installation.
35. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
36. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
37. Turn the ignition switch to ON (II).
38. Clear the DTC with the HDS.
39. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AC1 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the battery current sensor, then go to step 1.
NO -
Go to step 40.
40. Monitor the OBD STATUS for DTC P0AC1 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 39, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the MCM and the battery current sensor, then go to step 1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
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. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
45. Turn the ignition switch to ON (II).
46. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AC1 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the battery current sensor. 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 47.
47. Monitor the OBD STATUS for DTC P0AC1 in the DTCs MENU with the HDS.
Does the HDS 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 46, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the MCM and the battery current sensor. If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.