P1561
DTC P1561 (3): Motor Commutation Sensor B Circuit Low Input1. Reset the MCM.
2. Turn the ignition switch OFF.
3. Start the engine.
Is DTC P1561 indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the motor commutation sensor B and the MCM.
4. Turn the ignition switch OFF.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Turn the ignition switch ON (II).
8. Use a wrench to slowly rotate the crankshaft as you measure voltage between MCM connector terminals B4 and B12.
Does the measured voltage alternate between about 5 V and 0.6 V?
YES - 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 9.
9. Measure voltage between MCM connector terminals B4 and B22.
Is there about 5 V?
YES - Go to step 10.
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.
10. Turn the ignition switch OFF.
11. Disconnect the MCM connector B (24P).
12. Check for continuity between body ground and MCM connector terminal B12.
Is there continuity?
YES - Go to step 13.
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.
13. Disconnect the motor commutation sensor 10P connector.
14. Check for continuity between body ground and MCM connector terminal B12.
Is there continuity?
YES - Repair short in the wire between the motor commutation sensor and the MCM (B12).
NO - Replace the motor commutation sensor.