## Diesel Engine Management System

#### OBD System Troubleshooting (cont'd)

11-151

1. Measure the voltage of ECM as below.

- Between B terminal No. 86 and body ground.
- Engine cranking.

Is the voltage about 0 V?

YES – Go to step 14.

NO – Replace the RP sensor.

1. Check for the following conditions:

If the problem is found, repair as necessary.

- Damaged or faulty supply pump.
- Damaged or faulty fuel metering unit

Is a problem found?

YES – Repair the supply pump.

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

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