## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

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DTC P1003: Injector Performance Malfunction

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. Check the DTC.

Are there other DTCs (beside P1003) being output?

YES – Go to relevant DTC chart.

NO – Go to step 3.

1. Turn the ignition switch OFF.

1. Disconnect the ECM connector.

1. Remove the cylinder head cover insulator.

1. Check for the following conditions:

- Damaged injection pipe.
- Damaged injector.

Is a problem found?

YES – Replace the injector or injection pipe.

NO – Go to step 7.

1. Perform injector spray condition check.

Is a problem found?

YES – Clean or replace relevant injector.

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

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