Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 2
   
   The misfire current counters may not increment if certain DTCs are set. Use a scan tool to clear the DTCs. Monitoring the misfire current counters isolates which fuel injector is not operating. A cylinder that is misfiring can also cause the misfire current counters to increment for another cylinder. Diagnose the cylinder with the highest level of misfire first.
2. 4
   
   This step isolates the condition. If the test lamp blinks, the PCM is providing ground to the fuel injector. On some vehicles the camshaft position (CMP) sensor must provide a signal to the PCM before the PCM will provide a ground to the fuel injector. For this reason, the CMP circuits between the fuel injector harness multi-way connectors must be jumpered.
3. 5
   
   This step tests if a ground is constantly being applied to the fuel injector.
4. 6
   
   This step isolates the circuit between the multi-way connector and the PCM. An open or short to voltage on the fuel injector control circuit will not allow the test lamp to blink.
5. 8
   
   This step inspects for fuel injector harness damage between the multi-way connector and the upper intake manifold. Careful inspection may isolate the condition before removal of the upper intake manifold.
6. 10
   
   Perform the continuity test at the multi-way connector. If the Digital Multimeter (DMM) displays OL, test the circuits for an open or a poor connection.
7. 13
   
   This step isolates the circuit between the multi-way connector and the fuel injector. A short to voltage on the fuel injector control circuit will set this DTC.