DTC P0340: CMP Sensor A 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 Pending or Confirmed 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.
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.

Fig 1: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire between CMP sensor A and the No. 3 ALTERNATOR (10 A) fuse, then go to step 18.
Measure voltage between CMP sensor A 3P connector terminal No. 1 and body ground.

Fig 2: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Go to step 10.

NO - Go to step 11.
Measure voltage between CMP sensor A 3P connector terminals No. 2 and No. 3.

Fig 3: Measuring Voltage Between CMP Sensor A 3P Connector Terminals No. 2 And No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 16.

NO - Repair open in the wire between CMP sensor A and G101 (see ), then go to step 18.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM connector C (44P).
Check for continuity between ECM connector terminal C41 and body ground.

Fig 4: Checking Continuity Between ECM Connector Terminal C41 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the ECM (C41) and CMP sensor A, then go to step 18.

NO - Go to step 15.
Check for continuity between CMP sensor A 3P connector terminal No. 1 and ECM connector terminal C41.

Fig 5: Checking Continuity Between CMP Sensor A 3P Terminal No. 1 And ECM Terminal C41
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 23.

NO - Repair open in the wire between the ECM (C41) and CMP sensor A, then go to step 18.
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 with the HDS.
Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0340 indicated?

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

NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCs troubleshooting.
Reconnect all connectors.
Update the ECM if it does not have the latest software (see ECM UPDATE ), or substitute a known-good ECM (see SUBSTITUTING THE ECM ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0340 indicated?

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

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