P1564
DTC 54 (P1564): Motor Commutation Sensor C Circuit High Input1. Reset the MCM.
2. Start the engine.
Is DTC 54 indicated?
YES-Go to step 3.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at motor commutation sensor C and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Disconnect MCM connector D (16P).
7. Disconnect the motor commutation sensor 1 10P connector.
8. Connect motor commutation sensor 10P connector terminals No. 3, No. 7, and No. 10 to body ground with a jumper wire.
9. Check for continuity between MCM connector terminals D13, D15, D16, and body ground individually.
Is there continuity?
YES-Go to step 10.
NO-Repair open in the wire(s) between the motor commutation sensor and the MCM (D13, D15, D16).
10. Remove the jumper wires.
11. Reconnect the MCM connector D (16P).
12. Turn the ignition switch ON (II).
13. Measure voltage between MCM connector terminals D15 and D16.
Is there ore than 4.0 V?
YES-Go to step 14.
NO-Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
14. Turn the ignition switch OFF.
15. Reconnect the motor commutation sensor 10P connector.
16. Start the engine, and let it idle.
17. Measure voltage between MCM connector terminals D15 and D16.
Is there about 2 - 4 V?
YES-Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
NO-Replace the sensor plate or the motor commutation sensor.