System Check - Fuel Injection

Always begin diagnosis of the electronic fuel injection system with the On-Board Diagnostic (OBD) System Check before proceeding to any other diagnostics. This will reduce diagnosis time and prevent unnecessary replacement of parts. The On-Board Diagnostic (OBD) System Check will give direction to further diagnostics, such as Engine Cranks But Will Not Run or a DTC Table. Diagnosis of electronic fuel injection pump, including the fuel injection solenoid, fuel solenoid driver, injection timing stepper motor and engine shutoff solenoid also starts with the On-Board Diagnostic (OBD) System Check. Testing and Inspection

If a driveability symptom exists, refer to the particular symptom in the Driveability Symptoms. Testing and Inspection

Damage to the injection lines including chinking that causes restrictions or leakage could effect driveability or cause a DTC to set.