## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-67

1. Check the MAP with the scan tool.

Is about 250 kPa (1,877 mm Hg, 73 in. Hg) indicated?

YES – Go to step 10.

NO – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

1. Check the MAP sensor signal circuit for short.

Is a problem found?

YES – Repair open in the signal wire between ECM and the MAP sensor.

NO – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

NOTICE

The battery power supply short circuit to 5 V power supply damages the ECM.

DTC P0335: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Error

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