DTC Troubleshooting
DTC P1575 (12): MCM Voltage MalfunctionNOTE:
- Before you troubleshoot, record all freeze data, and review the general troubleshooting information.
- 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 ON (II).
2. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0AE1 (62) indicated?
YES - Do the troubleshooting for DTC P0AE1 (62).
NO - Go to step 3.
3. Turn the ignition switch ON (II), then 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 Park or neutral) 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 OFF.
11. Turn the battery module switch OFF.
12. Remove the IPU lid.
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 38.
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, 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, then go to step 29.
NO - Repair open in the wire between the junction board 12P connector and the BCM module (A4, A28), then go to step 29.
21. Turn the ignition switch OFF.
22. Turn the battery module switch OFF.
23. Remove the IPU lid.
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 ON (II).
26. Record the values of IMA BATTERY MODULE 1 VOLTAGE through 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 listed IMA BATTERY MODULE VOLTAGES in the DATA LIST with the HDS.
- B6 and B14, compared to IMA BATTERY MODULE 1 VOLTAGE
- B14 and 85, 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 measurement and the DATA LIST measurement?
YES - Go to step 38.
NO - Go to step 47.
29. Turn the ignition switch OFF.
30. Reconnect all connectors.
31. Reinstall the IPU lid, then turn the battery module switch ON.
32. Turn the ignition switch ON (II).
33. Clear the DTC with the HDS.
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 Park or neutral) until the SOC is 70 %.
36. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1575 (12) indicated?
YES - Check for poor connections or loose terminals at the MCM, the high voltage contactor, 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 Temporary DTCs or 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 OFF.
39. Reconnect all connectors.
40. Reinstall the IPU lid, then turn the battery module switch ON.
41. Update the BCM module if it does not have the latest software, or substitute a known-good BCM module.
42. Clear the DTC with the HDS.
43. Check the SOC in the DATA LIST with the HDS.
44. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in Park or neutral) until the SOC is 70 %.
45. Check for Temporary DTCs or 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, then go to step 43. If the BCM module was substituted, go to step 1.
NO - Go to step 46.
46. 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. If any other Temporary DTCs or DTCs were indicated in step 45, 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, then go to step 43. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 43.
47. Turn the ignition switch OFF.
48. Reconnect all connectors.
49. Reinstall the IPU lid, then turn the battery module switch ON.
50. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
51. Clear the DTC with the HDS.
52. Check the SOC in the DATA LIST with the HDS.
53. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in Park or neutral) until the SOC is 70 %.
54. Check for Temporary DTCs or 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, then go to step 51. If the MCM was substituted, go to step 1.
NO - Go to step 55.
55. 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. If any other Temporary DTCs or DTCs were indicated in step 54, 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, then go to step 52. If the MCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 52.