NOTE: This� test� only� applies� to� vehicles� equipped� with� a� VCM.
1. Perform� On Board� Diagnostic� (OBD)� System� Check.� See� ON BOARD� DIAGNOSTIC� (OBD)� SYSTEM� CHECK� in� TESTS� W/CODES � 5.7L� article.� After� performing� OBD� system� check, � go� to� next� step.
2. Disconnect� injector� connector� at� intake� manifold.� Turn� ignition� on� with� engine� off.� Using� test� light� connected� to� ground, � probe� injector� ignition� feed� circuits.� See� WIRING� DIAGRAMS � 5.7L� article.� If� test� light
illuminates, � go� to� next� step.� If� test� light� does� not� illuminate, � go� to� step� 7).
3. Install� injector� test� light� to� each� injector� circuit, � one� at� a� time.� Crank� engine.� If� injector� test� light� flashes� on� each� injector, � check� fuel� injector(s).� See� FUEL� SYSTEM� in� SYSTEM/COMPONENT� TESTS � 5.7L
article.� If� injector� test� light� did� not� flash� on� an� injector� circuit, � go� to� next� step.
4. If� injector� test� light� was� on� steady� on� any� injector� circuit, � go� to� next� step.� If� injector� test� light� did� not� illuminate� on� any� injector� circuit, � go� to� step� 6).
5. Install� injector� test� light� to� affected� injector.� Turn� ignition� off.� Disconnect� Blue� and� Red� VCM� connectors.� Turn� ignition� on� with� engine� off.� If� injector� test� light� turns� off, � go� to� step� 11).� If� injector� test� light� stays� on,
go� to� step� 8).
6. Check� for� open� or� short� to� battery� in� injector� control� circuit� to� affected� injector.� If� circuit� is� open� or� shorted, � go� to� next� step.� If� circuit� is� okay, � go� to� step� 9).
7. Repair� circuit� as� necessary.� After� repairs, � go� to� step� 12).
8. Repair� short� to� ground� in� injector� control� circuit.� After� repairs, � go� to� step� 12).
9. Check� terminal� contact� at� VCM� connector.� If� terminal� contact� is� faulty, � go� to� next� step.� If� terminal� contact� is� okay, � go� to� step� 11).
10. Repair� terminal� contact.� After� repairs, � go� to� step� 12).
11. Replace� VCM.� Reprogram� replacement� VCM.� After� replacing� VCM, � go� to� next� step.
12. Using� scan� tool, � select� DTC, � CLEAR� INFO� function.� Attempt� to� start� engine.� If� engine� starts� and� continues� to� run, � go� to� next� step.� If� engine� does� not� start, � or� starts� and� stalls/dies, � go� to� step� 2).
13. Warm� engine� to� normal� operating� temperature.� Using� scan� tool, � select� DTC, � FAILED� THIS� IGN� function.� If� any� other� DTC(s)� is� present, � diagnose� DTC(s).� If� no� other� DTC(s)� is� present, � go� to� next� step.
14. Using� scan� tool, � select� CAPTURE� INFO, � REVIEW� INFO� function.� If� additional� undiagnosed� DTC(s)� are� present, � diagnose� DTC(s).� If� additional� DTC(s)� are� not� present, � system� is� okay.
Monday, April 2nd, 2012 AT 8:12 PM