## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-120

1. Check the APP sensor signal circuit for open.

Wire side of female terminals

Is a problem found?

YES – Repair the signal wire between ECM and the APP sensor.

NO – Replace the APP sensor.

DTC P1331: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Dynamic Implausible

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 CKP sensor and at the ECM.

NO – Go to step 3.

1. Check the engine speed (cranking speed) with the scan tool.

Turn the ignition switch to start (III).

Is about 0 rpm (min-1) indicated?

YES – Go to step 4.

NO – Go to step 8.

1. Turn the ignition switch OFF.

1. Disconnect the CKP sensor 3P connector.

1. Disconnect the ECM connector.

1. Check the CKP sensor signal circuit for open or short to ground.

Wire side of female terminals

CKP sensor 3P connector

JUMPER WIRE

a a a