P0340
DTC P0340: CMP Sensor No SignalDTC P0344: CMP Sensor Intermittent Interruption
1. 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 wires at the CMP sensor and at the ECM/PCM.
3. Turn the ignition switch OFF.
4. Disconnect the CMP sensor 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between CMP sensor 3P connector terminal No.3 and body ground.
Is there battery voltage?
YES - Go to step 7.
NO - Check the No. 4ACG (10A) fuse in the under- dash fuse/relay box. If the fuse is OK, repair open in the wire between the CMP sensor and No.4 ACG (10A) fuse.
7. Measure voltage between CMP sensor 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 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 and G101.
9. Substitute a known-good CMP sensor 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.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Disconnect ECM/PCM connector A (31P).
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.
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.