DTC P0340: CMP Sensor No Signal

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0340 indicated?
1. YES - Go to step 5.
2. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
Turn the ignition switch OFF.
Disconnect the CMP sensor 3P connector.
Turn the ignition switch ON (II).
Measure voltage between CMP sensor 3P connector terminal No. 3 and body ground.

Fig 1: Measuring Voltage Between CMP Sensor 3P Connector Terminal 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 9.
2. NO - Repair open in the wire between the CMP sensor and PGM-FI main relay 1 (FI MAIN), then go to step 18.
Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground.

Fig 2: Measuring Voltage Between CMP Sensor 3P Connector Terminal 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?
1. YES - Go to step 10.
2. NO - Go to step 11.
Measure voltage between CMP sensor 3P connector terminals No. 2 and No. 3.

Fig 3: Measuring Voltage Between CMP Sensor 3P Connector Terminals 2 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 16.
2. NO - Repair open in the wire between the CMP sensor and G101, then go to step 18.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect PCM connector A (76P).
Check for continuity between PCM connector terminal A45 and CMP sensor 3P connector terminal No. 1.

Fig 4: Checking Continuity Between PCM Connector Terminal A45 And CMP Sensor 3P Connector Terminal 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 15.
2. NO - Repair open in the wire between the PCM (A45) and the CMP sensor, then go to step 18.
Check for continuity between CMP sensor 3P connector terminal No. 1 and body ground.

Fig 5: Checking Continuity Between CMP Sensor 3P Connector Terminal 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short in the wire between the PCM (A45) and the CMP sensor, then go to step 18.
2. NO - Go to step 24.
Turn the ignition switch OFF.
Replace the CMP sensor (see CMP SENSOR REPLACEMENT ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Start the engine.
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
1. YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
2. NO - Troubleshooting is complete.
Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
1. YES - If DTC P0340 is indicated, check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
2. NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).