DTC Troubleshooting
DTC Troubleshooting: P1575 (12)
DTC P1575 (12):
MCM Voltage Malfunction
NOTE:
- Before you troubleshoot, record all freeze data, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If the battery module switch is turned OFF while the ignition switch is ON (II) , DTC P1575 (12) may be detected.
1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0AE1 (62) indicated?
YES -
Do the troubleshooting for DTC P0AE1 (62) P0AE1.
NO -
Go to step 3.
3. Turn the ignition switch to ON (II), and wait 1 minute.
4. Compare the MPI VOLTAGE and the TOTAL VOLTAGE OF ALL IMA BATTERY MODULES in the DATA LIST with the HDS.
Is there more than a 10 V difference between the MPI VOLTAGE and the TOTAL VOLTAGE OF ALL IMA BATTERY MODULES?
YES -
Go to step 8.
NO -
Go to step 5.
5. Check the SOC in the DATA LIST with the HDS.
6. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in P or N) until the SOC changes to 70 %.
7. Monitor the OBD STATUS for DTC P1575 (12) in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES -
Go to step 21.
NO -
If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM, the high voltage connector, and the BCM module. If the screen indicates NOT COMPLETED, go to step 3.
8. Record the value of the MPI VOLTAGE in the DATA LIST with the HDS.
9. Compare the MPI VOLTAGE and the TOTAL VOLTAGE OF ALL IMA BATTERY MODULES in the DATA LIST with the HDS.
Is there more than a 10 V difference between the MPI VOLTAGE and the TOTAL VOLTAGE OF ALL IMA BATTERY MODULES?
YES -
Go to step 10.
NO -
Go to step 21.
10. Turn the ignition switch to LOCK (0).
11. Turn the battery module switch OFF High Voltage Safety.
12. Remove the IPU lid IPU Lid Removal/Installation.
13. Check the high voltage cable (orange cable) connection and busbar connection on the junction board.
Are the connections OK?
YES -
Go to step 14.
NO -
Repair the connections, then go to step 29.
14. Disconnect BCM module connector A (40P).
15. Check for continuity between BCM module connector terminals A14 and A28.
Is there continuity?
YES -
Go to step 16.
NO -
Go to step 19.
16. Check for continuity between BCM module connector terminal A14 and body ground.
Is there continuity?
YES -
Go to step 17.
NO -
Go to step 39.
17. Disconnect the junction board 12P connector.
18. Check for continuity between BCM module connector terminal A14 and body ground.
Is there continuity?
YES -
Repair short to ground in the wire between the junction board 12P connector and the BCM module (A14), then go to step 29.
NO -
Replace the battery module Service and Repair, then go to step 29.
19. Disconnect the junction board 12P connector.
20. Check for continuity between these terminals:
- BCM module connector terminal A14 and junction board 12P connector terminal No. 1.
- BCM module connector terminal A28 and junction board 12P connector terminal No. 2.
Is there continuity?
YES -
Replace the battery module Service and Repair, then go to step 29.
NO -
Repair open in the wire between the junction board 12P connector and the BCM module (A14, A28), then go to step 29.
21. Turn the ignition switch to LOCK (0).
22. Turn the battery module switch OFF High Voltage Safety.
23. Remove the IPU lid IPU Lid Removal/Installation.
24. Check the BCM module connector terminals.
Are the terminals OK?
YES -
Go to step 25.
NO -
Repair the BCM module connector terminals, then go to step 29.
25. Turn the ignition switch to ON (II).
26. Record the values of the IMA BATTERY MODULE 1 VOLTAGE through the IMA BATTERY MODULE 11 VOLTAGE in the DATA LIST with the HDS.
27. Disconnect BCM module connector B (14P).
28. Using the IMA BATTERY MODULE VOLTAGES you noted in step 26, compare the voltage 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 a 1 V difference between the BCM module measurement and the DATA LIST measurement?
YES -
Go to step 38.
NO -
Go to step 46.
29. Turn the ignition switch to LOCK (0).
30. Reconnect all connectors.
31. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
32. Turn the ignition switch to ON (II).
33. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
34. Check the SOC in the DATA LIST with the HDS.
35. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in P or N) until the SOC is 70 %.
36. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 (12) indicated?
YES -
Check for poor connections or loose terminals at the MCM, the high voltage connector, and the BCM module, then go to step 1.
NO -
Go to step 37.
37. Monitor the OBD STATUS for DTC P1575 (12) 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 36, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the MCM, the high voltage connector, and the BCM module, then go to step 1. If the screen indicates NOT COMPLETED, go to step 34.
38. Turn the ignition switch to LOCK (0).
39. Reconnect all connectors.
40. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
41. 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.
42. Check the SOC in the DATA LIST with the HDS.
43. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in P or N) until the SOC is 70 %.
44. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 (12) indicated?
YES -
Check for poor connections or loose terminals at the MCM, the high voltage connector, 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 42. If the BCM module was substituted, go to step 1.
NO -
Go to step 45.
45. Monitor the OBD STATUS for DTC P1575 (12) 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 44, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the MCM, the high voltage connector, 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 42. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 42.
46. Turn the ignition switch to LOCK (0).
47. Reconnect all connectors.
48. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
49. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM Initial Inspection and Diagnostic Overview.
50. Check the SOC in the DATA LIST with the HDS.
51. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in P or N) until the SOC is 70 %.
52. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 (12) indicated?
YES -
Check for poor connections or loose terminals at the MCM, the high voltage connector, and the BCM module. If the MCM was updated, substitute a known-good MCM Initial Inspection and Diagnostic Overview, then go to step 50. If the MCM was substituted, go to step 1.
NO -
Go to step 53.
53. Monitor the OBD STATUS for DTC P1575 (12) 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 MCM Replacement. If any other Pending or Confirmed DTCs were indicated in step 52, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the MCM, the high voltage connector, and the BCM module. If the MCM was updated, substitute a known-good MCM Initial Inspection and Diagnostic Overview, then go to step 50. If the MCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 50.