P0344
DTC P0344: CMP Sensor A Intermittent Interruption1. Reset the ECM/PCM.
2. 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 the CMP sensor A and at the ECM/PCM.
3. Turn the ignition switch OFF.
4. Disconnect the CMP sensor A 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between CMP sensor A 3P connector terminal No.3 and body ground.
Is there battery voltage?
YES - Go to step 7.
NO - Check the No.4 ACG (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the CMP sensor A and No.4 ACG (10 A)fuse.
7. Measure voltage between CMP sensor A 3P connector terminal No.1 and body ground.
Is there about 5 V?
YES - Go to step 8.
NO - Go to step 10.
8. Measure voltage between CMP sensor A 3P connector terminals No.2 and No.3.
Is there battery voltage?
YES - Go to step 9.
NO - Repair open in the wire between the CMP sensor A and G101.
9. Substitute a known-good CMP sensor A and recheck.
Is DTC P0340 and/or P0344 indicated?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Replace the original CMP sensor.
10. Measure voltage between ECM/PCM connector terminal A25 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the ECM/PCM (A25) and CMP sensor A.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Disconnect ECM/PCM connector A (31 P).
13. Check for continuity between ECM/PCM connector terminal A25 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A25) and the CMP sensor A.
NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.