DTC Troubleshooting
DTC Troubleshooting: P1575 (12)
DTC P1575:
Motor Power Inverter (MPI) Module Voltage Malfunction
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 battery module switch is turned OFF while the ignition switch is ON (II), DTC P1575 may be stored.
- 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 P0AE1 indicated?
YES -
Do the troubleshooting for DTC P0AE1 P0AE1.
NO -
Go to step 4.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the junction board, the MCM, and the MPI module.
5. Turn the ignition switch to LOCK (0).
6. Turn the battery module switch OFF.
7. Remove the IPU cover IPU Cover Removal/Installation.
8. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
9. Disconnect MCM connector B (24P).
10. Measure the resistance between MCM connector terminals B9 and B10.
Is there 23.4-28.6 Ohms?
YES -
Go to step 11.
NO -
- If the resistance is too high, go to step 17.
- If the resistance is too low, go to step 19.
11. Check for continuity between MCM connector terminal B10 and body ground.
Is there continuity?
YES -
Go to step 12.
NO -
Go to step 14.
12. Disconnect the junction board 12P connector (A).
13. Check for continuity between MCM connector terminal B10 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the junction board 12P connector and the MCM (B10), then go to step 28.
NO -
Replace the battery module Service and Repair, then go to step 28.
14. Make sure the battery module switch is turned OFF.
15. Connect MCM connector terminal B10 to 12 V battery power, and connect MCM connector terminal B9 to body ground.
16. Check for continuity between the high voltage contactor terminals (A, B).
Is there continuity?
YES -
Go to step 21.
NO -
Replace the battery module Service and Repair, then go to step 28.
17. Disconnect the junction board 12P connector (A).
18. Check for continuity between MCM connector terminal B10 and junction board 12P connector terminal No. 6.
Is there continuity?
YES -
Replace the battery module Service and Repair, then go to step 28.
NO -
Repair an open in the wire between the junction board 12P connector and the MCM (B10), then go to step 28.
19. Disconnect the junction board 12P connector (A).
20. Check for continuity between MCM connector terminals B9 and B10.
Is there continuity?
YES -
Repair a short in the wire between the junction board 12P connector and the MCM (B9, B10), then go to step 28.
NO -
Replace the battery module Service and Repair, then go to step 28.
21. Reconnect MCM connector B (24P).
22. Turn the ignition switch to ON (II).
23. Record the value of the IMA BATTERY MODULE 1 VOLTAGE through IMA BATTERY MODULE 7 VOLTAGE in the DATA LIST with the HDS.
24. Turn the ignition switch to LOCK (0).
25. Disconnect MCM connector E (31P).
26. Compare the voltages you recorded in step 23 with the voltages you record between the MCM connector terminals listed below.
- E21 and E31, compared to IMA BATTERY MODULE 1 VOLTAGE
- E20 and E21, compared to IMA BATTERY MODULE 2 VOLTAGE
- E9 and E20, compared to IMA BATTERY MODULE 3 VOLTAGE
- E8 and E9, compared to IMA BATTERY MODULE 4 VOLTAGE
- E12 and E13, compared to IMA BATTERY MODULE 5 VOLTAGE
- E2 and E12, compared to IMA BATTERY MODULE 6 VOLTAGE
- E1 and E2, compared to IMA BATTERY MODULE 7 VOLTAGE
Is there more than a 1 V difference between the MCM readings, and the readings from step 23?
YES -
Go to step 34.
NO -
Replace the MPI module Service and Repair, then go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Reconnect all connectors.
29. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
30. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
31. Turn the ignition switch to ON (II).
32. Clear the DTC with the HDS.
33. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 indicated?
YES -
Check for poor connections or loose terminals at the junction board, the MCM, and the MPI module, then go to step 1.
NO -
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
34. Turn the ignition switch to LOCK (0).
35. Reconnect all connectors.
36. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
37. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
38. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
39. Turn the ignition switch to ON (II).
40. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1575 indicated?
YES -
Check for poor connections or loose terminals at the junction board, the MCM, and the MPI module. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1.
NO -
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, go to the indicated DTC's troubleshooting.