DTC P0340: CMP Sensor A No Signal, DTC P0344: CMP Sensor A Intermittent Interruption
- Reset the ECM (see HOW TO UPDATE THE ECM ).
- Start the engine.
Is DTC P0340 and/or P0344 indicated?
YES: Go to step 3.
NO: Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at CMP sensor A and at 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.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES: Go to step 7.
NO: Check the No. 4 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between CMP sensor A, and No. 4 ACG (10A) fuse.
- Measure 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 8.
NO: Go to step 10.
- Measure 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 9.
NO: Repair open in the wire between CMP sensor A and G101.
- Substitute a known-good CMP sensor A and recheck.
Is DTC P0340 and/or P0344 indicated?
YES: Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck (see ECM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO: Replace the original CMP sensor A (see CMP SENSOR A REPLACEMENT ).
- Measure voltage between ECM connector terminal A25 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 5 V?
YES: Repair open in the wire between the ECM (A25) and CMP sensor A.
NO: Go to step 11.
- Turn the ignition switch OFF.
- Disconnect ECM connector A (31P).
- Check for continuity between ECM connector terminal A25 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES: Repair short in the wire between the ECM (A25) and CMP sensor A.
NO: Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck (see ECM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM, replace the original ECM.