DTC P0340: CMP Sensor A No Signal

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review 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?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM.
Turn the ignition switch OFF.
Disconnect the CMP sensor A 3P connector.
Turn the ignition switch ON (II).
Measure voltage between CMP sensor A 3P connector terminal No. 3 and body ground.
Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire between the No. 4 ACG (10 A) fuse in the under-dash fuse/relay box and CMP sensor A, then go to step 18.

Fig 1: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 3 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure voltage between CMP sensor A 3P connector terminal No. 1 and body ground.
Is there about 5 V?

YES - Go to step 1010.

NO - Go to step 11.

Fig 2: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure voltage between CMP sensor A 3P connector terminals No. 2 and No. 3.
Is there battery voltage?

YES - Go to step 16.

NO - Repair open in the wire between CMP sensor A and G101, then go to step 18.

Fig 3: Measuring Voltage Between CMP Sensor A 3P Connector Terminals No. 2 & No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure voltage between ECM/PCM connector terminal A19 and body ground.
Is there about 5 V?

YES - Repair open in the wire between the ECM/PCM (A19) and CMP sensor A, then go to step 18.

NO - Go to step 12.

Fig 4: Measuring Voltage Between ECM/PCM Connector Terminal A19 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (31P).
Check for continuity between ECM/PCM connector terminal A19 and body ground.
Is there continuity?

YES - Repair short in the wire between the ECM/PCM (A19) and CMP sensor A, then go to step 18.

NO - Go to step 24.

Fig 5: Checking Continuity Between ECM/PCM Connector Terminal A19 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch OFF.
Replace CMP sensor A (see CMP SENSOR A REPLACEMENT ).
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do ECM/PCM IDLE LEARN PROCEDURE .
Start the engine.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0340 indicated?

YES - Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
Start the engine, and let it idle.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0340 indicated?

YES - Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM, then go to step 1. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 26. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.