## VTEC/VTC System

#### DTC Troubleshooting (cont'd)

11-101

DTC P0340: CMP Sensor No Signal DTC P0344: CMP Sensor Intermittent Interruption

1. Reset the ECM (see page 11-4).

1. 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.

1. Turn the ignition switch OFF.

1. Disconnect the CMP sensor 3P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between the CMP sensor 3P connector terminal No. 3 and body ground.

CMP SENSOR 3P CONNECTOR

Wire side of female terminals

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 OK, repair open in the wire between the CMP sensor and No. 4 ACG (10A) fuse.

1. Measure voltage between the CMP sensor 3P connector terminal No. 1 and body ground.

CMP SENSOR 3P CONNECTOR

Wire side of female terminals

Is there about 5 V?

YES - Go to step 8.

NO - Go to step 10.

1. Measure voltage between the CMP sensor 3P connector terminals No. 2 and No. 3.

CMP SENSOR 3P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire between the CMP sensor and G101.

1. Substitute a known-good CMP sensor and recheck.

   Is DTC P0340 and/or P0344 indicated?

YES - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.

NO - Replace the original CMP sensor.

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