## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-72

DTC P0343: Camshaft Position (CMP) Sensor Too High Frequency

1. Check the ''On Board Diagnostic (OBD) System Check''.

Was the ''OBD System Check'' performed?

YES – Go to step 2.

NO – Go to OBD System Check.

1. Attempt to start the engine.

Did the engine start and continue to run?

YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the CMP sensor and at the ECM.

NO – Go to step 3.

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 terminals No. 3 and body ground.

Wire side of female terminals

CMP sensor 3P connector

Is there battery voltage?

YES – Go to step 7.

NO – Repair open in the wire between the main relay and the CMP sensor.

1. Check the CMP sensor signal and ground circuit for short.

Is a problem found?

YES – Repair open in the signal or ground wire between the ECM and the CMP sensor.

NO – Go to step 8.

1. Check the CMP sensor signal and ground circuit for open.

Wire side of female terminals

CMP sensor 3P connector

JUMPER WIRE

Is a problem found?

YES – Repair open in the signal or ground wire between the ECM and the CMP sensor.

NO – Go to step 9.

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