## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-68

Is a problem found? YES – Repair open in the signal wire between ECM and the CKP sensor. NO – Go to step 8.

1. Connect the CKP sensor 3P connector.

1. Turn the ignition switch ON (II).

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

Is about 0 V indicated?

YES – Go to step 11.

NO – Repair open in the ground wire between ECM and the CKP sensor.

1. Check for the following conditions:

- Damaged the CKP sensor (A)
- CKP sensor fixing condition

Is a problem found?

YES – Repair as necessary.

NO – Go to step 12.

1. Replace the CKP sensor.

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 – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

NO – Repair the CKP signal plate.

NOTICE

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

a a a