Fuel Injector Circuit Inspection: Troubleshooting

FUEL INJECTOR - TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Check injector for operating sound Using sound scope, check each injector for operating sound at engine cranking. Do all 6 injectors make operating sound?	Go to Step 2.	Go to Step 3.
2	Wire harness check Remove ECM cover and disconnect connectors from ECM. Check for resistance between the following terminals of ECM connector disconnected. Fuel injector and its circuit resistance (at 20 °C (68 °F)) "C51-2-1"-"C51-3-4": 14.2 - 14.8 Ω "C51-2-2"-"C51-3-4": 14.2 - 14.8 Ω "C51-2-8"-"C51-3-4": 14.2 - 14.8 Ω "C51-2-9"-"C51-3-4": 14.2 - 14.8 Ω "C51-2-21"-"C51-3-4": 14.2 - 14.8 Ω "C51-2-22"-"C51-3-4": 14.2 - 14.8 Ω Is check result as specified?	Fuel injector circuit is in good condition.	"PNK", "PNK/BLK", "PNK/GRN", "PNK/BLU", "GRY/GRN" and "GRY/BLK" shorted each other.
3	Does none of 6 injectors make operating sound at Step 1?	Go to Step 4.	Check coupler connection and wire harness of injector not making operating sound and injector itself. Refer to FUEL INJECTOR ON-VEHICLE INSPECTION .
4	Check power circuit of injectors for open and short. Is it normal?	Check all 6 injectors for resistance respectively. It resistance is OK, substitute a known-good ECM and recheck.	Power circuit open or short.