DTC P1003: Injector Performance Malfunction
- 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. 
- Check the DTC.
Are there other DTCs (beside P1003) being output?
YES – Go to relevant DTC chart.
NO – Go to step 3.
- Turn the ignition switch OFF.
- Disconnect the ECM connector.
- Remove the cylinder head cover insulator.
- 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.
- 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.
