P1575
DTC P1575 (12): MPI Voltage Problem1. Check that the battery module switch is ON.
Is the switch ON?
YES-Go to step 2.
NO-Turn the battery module switch ON.
2. Reset the MCM.
3. Turn the ignition switch ON (II).
Is DTC P1629 indicated?
YES-Do the troubleshooting for DTC P1629.
NO-Go to step 4.
4. Check the DTC.
Is DTC P1570 indicated?
YES-Do the troubleshooting for DTC P1570.
NO-Go to step 5.
5. Check the DTC.
Is DTC P1445 indicated?
YES-Do the troubleshooting for DTC P1445.
NO-Go to step 6.
6. Check the DTC.
Is DTC P1575 indicated?
YES-Go to step 8.
NO-Go to step 7.
7. Start the engine, and hold it at 4,000 rpm for 10 seconds.
Is DTC P1575 indicated?
YES-Go to step 12.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the high voltage contactor, the battery module, and the MCM.
8. Turn the ignition switch OFF.
9. Turn the battery module switch OFF.
10. Remove the IPU lid.
11. Check for poor connections or loose terminals at the junction board, the MPI module, and the busbars.
Are connections OK?
YES-Repair open or short in the high voltage line between the junction board and MPI module. If the high voltage line is OK, replace the battery module.
NO-Repair poor connections or loose terminals at the junction board, the MPI module, and the busbars.
12. Turn the ignition switch OFF.
13. Turn the battery module switch OFF.
14. Remove the IPU lid.
15. Check the connections at MCM connector F (14P).
Are the connections OK?
YES-Go to step 16.
NO-Repair the poor connections at MCM connector F (14P).
16. Turn the battery module switch ON.
17. Measure voltage between MCM connector terminals F10 and F14, then record it.
18. Turn the ignition switch ON (II).
19. Measure voltage between the two terminals of the junction board, then compare it with step 17.
Is there less than about 9 V or less difference between the two voltages?
YES-
^ Replace the MPI module.
^ Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO-Go to step 20.
20. Turn the ignition switch OFF.
21. Disconnect the junction board 4P connector.
22. At the junction board side, check for continuity between junction board 4P connector terminals No. 3 and No. 4.
Is there continuity?
YES-Go to step 23.
NO-Replace the battery module.
23. Check for continuity between junction board 4P connector terminal No. 3 and body ground.
Is there continuity?
YES-Go to step 24.
NO-Repair open in the wire between the high voltage contactor and G551.
24. Measure voltage between MCM connector terminal A6 and body ground.
Is there battery voltage?
YES-Repair open in the wire between the high voltage contactor and the MCM (A6).
NO-Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.