DTC 18
DTC 18 (P1561): Motor Commutation Sensor B Circuit Low Input1. Reset the MCM.
2. Turn the ignition switch OFF.
3. Start the engine.
Is DTC 18 indicated?
YES-Go to step 4.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at 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. Start the engine, and let it idle.
8. Measure voltage between MCM connector terminals D8 and D10.
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-Go to step 9.
9. Turn the ignition switch OFF.
10. Turn the ignition switch ON (II).
11. Measure voltage between MCM connector terminals D6 and D10.
Is there more than 4 V?
YES-Go to step 12.
NO-Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
12. Turn the ignition switch OFF.
13. Disconnect MCM connector D (16P).
14. Disconnect the motor commutation sensor 10P connector.
15. Check for continuity between body ground and MCM connector terminal D8.
Is there continuity?
YES-Repair short in the wire between the motor commutation sensor and the MCM (D8).
NO-Go to step 16.
16. M/T: Remove the transmission and the clutch.
17. CVT: Remove the transmission.
18. Inspect the sensor plate for bending, and the motor commutation sensor connection.
Is the sensor plate and the connection OK?
YES-Replace the motor commutation sensor.
NO-Replace the sensor plate or repair the motor commutation sensor connection.