DTC P1565 (42): Motor Commutation Signal Problem; DTC P1566 (42): Motor Commutation Signal Problem

NOTE:

Information marked with an asterisk (*) applies to 2005-2006 models.
Information marked with double asterisk (**) applies to 2000-2004 models.

Reset the MCM (see HOW TO RESET THE MCM ).
Turn the ignition switch ON (II).
Is DTC P1565 (42)** (P1566 (42)*) indicated?
1. YES - Go to step 3.
2. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the motor commutation sensor and at the MCM.
Turn the ignition switch OFF.
Disconnect the motor commutation sensor 10P connector.
Turn the ignition switch ON (II).
In the engine compartment, measure voltage between motor commutation sensor 10P connector terminals No. 5 and No. 9, No. 4 and No. 8, and No. 7 and No. 10.

Fig 1: Measuring Voltage Between Motor Commutation Sensor 10P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Go to step 13.
2. NO - Go to step 7.
Measure voltage between body ground and motor commutation sensor 10P connector terminals No. 5, No. 4, and No. 7.

Fig 2: Measuring Voltage Between Body Ground And Motor Commutation Sensor 10P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Repair open in the wire between the motor commutation sensor and the MCM (D4, D10, D16).
2. NO - Go to step 8.
Turn the ignition switch OFF.
Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Turn the ignition switch ON (II).
Measure voltage between MCM connector terminals D1 and D4, D6 and D10, and D13 and D16.

Fig 3: Measuring Voltage Between MCM Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Repair open in the wire between the motor commutation sensor and the MCM (D1, D6, D13).
2. NO - Substitute a known-good MCM and commutation sensor, and recheck. If the symptom/ indication goes away, replace the original MCM and commutation sensor.
Turn the ignition switch OFF.
Check for continuity between body ground and motor commutation sensor 10P connector terminals No. 1, No. 2, and No. 3 individually.

Fig 4: Checking Continuity Between Body Ground And Motor Commutation Sensor 10P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 15.
2. NO - Go to step 17.
Disconnect MCM connector D.
Check for continuity between body ground and motor commutation sensor 10P connector terminals No. 1, No. 2, and No. 3 individually.
Is there continuity?
1. YES - Repair short to ground in the wire between the motor commutation sensor and the MCM (D2, D8, D15).
2. NO - Replace the MCM.
Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Connect MCM connector terminals D2, D8, and D15 to body ground with a jumper wire.

Fig 5: Connecting MCM Connector Terminals D2, D8 And D15 To Body Ground Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and motor commutation sensor 10P connector terminals No. 1, No. 2, and No. 3 individually.

Fig 6: Checking Continuity Between Body Ground And Motor Commutation Sensor 10P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Substitute a known-good MCM and motor commutation sensor, and recheck. If the symptom/ indication goes away, replace the original MCM and motor commutation sensor.
2. NO - Repair open in the wire between the motor commutation sensor and the MCM (D2, D8, D15).