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Fuel Injector Circuit Check: Troubleshooting

DIAGNOSIS PROCEDURE

Step Action YES NO
1  Check each injector for operating sound at engine cranking using sound scope 
Do all 4 injector make operating sound? 		 Intermittent trouble.
Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
If OK, substitute a known-good ECM and recheck.		 Go to Step 2.
2  Check fuel injector resistance 
  1. Disconnect connectors from fuel injectors with ignition switch turn OFF.
  2. Check for proper connection to fuel injector at each terminals.
  3. If it is OK, check all 4 fuel injectors for resistance, referring to FUEL INJECTOR INSPECTION .

Are all injectors in good condition? 		 Go to Step 3. Faulty fuel injector.
3  Check fuel injector insulation resistance 
  1. Check that there is insulating between each fuel injector terminals and engine ground.

Is there insulating? 		 Go to Step 4. Faulty fuel injector.
4  Check fuel injector power supply 
  1. Measure voltage between each "BLU/BLK" wire terminal of fuel injector connector and engine ground with ignition switch turned ON.

Is voltage 10 - 14 V? 		 Go to Step 5. Open wire in "BLK/RED", "BLU/BLK" circuit or "BLK/RED", "BLU/BLK" circuit shorted to ground circuit. If it is in good condition, go to ECM POWER AND GROUND CIRCUIT CHECK .
5  Check wire circuit 
  1. Turn OFF ignition switch.
  2. Disconnect connectors from ECM.
  3. Measure resistance between each "C46-1", "C46-2", "C46-3", "C46-4" terminal and vehicle body ground.

Is resistance infinity? 		 Go to Step 6. "BLU/YEL", "BLU/WHT", "BLU/RED", "BLU/GRN", "PNK", "PNK/BLK", "PNK/GRN" or "PNK/BLU" wire shorted to ground.
6  Check wire circuit 
  1. Measure voltage between each "C46-1", "C46-2", "C46-3", "C46-4" terminal and vehicle body ground with ignition switch turned ON.

Is voltage 0 V? 		 Go to Step 7. "BLU/YEL", "BLU/WHT", "BLU/RED", "BLU/GRN", "PNK", "PNK/BLK", "PNK/GRN" or "PNK/BLU" wire shorted to power supply circuit.
7  Check fuel injector drive signal 
  1. Connect connectors to each fuel injectors with ignition switch turn OFF.
  2. Remove ECM from vehicle body referring to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION and connect connectors to ECM.
  3. Turn ON ignition switch.
  4. Measure voltage between each "C46-1", "C46-2", "C46-3", "C46-4" terminal and vehicle body ground.

Is voltage 10 - 14 V? 		 Check fuel injector, referring to FUEL INJECTOR INSPECTION . If result in good condition, substitute a known-good ECM and recheck. Open or high resistance wire in "BLU/YEL", "BLU/WHT", "BLU/RED", "BLU/GRN", "PNK", "PNK/BLK", "PNK/GRN" or "PNK/BLU" circuit.
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