Control Circuit Inspection

Check for Short to Ground in Control Circuit

1. Ignition "OFF".
2. Disconnect injector and ECM connectors.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal 2 of the injector harness connector and chassis ground.
   1. Specification: Approx. 0V
      Fig 1: Measuring Voltage Between Terminal 2 Of Injector Harness Connector And Chassis Ground

      
5. Is voltage within the specification?

   YES

   1. Go to next step as below.

   NO

   1. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check for Open in Control Circuit

1. Ignition "OFF".
2. Measure resistance between terminals 2 of the injector harness connector and 50 of the ECM harness connector.
   1. Specification: Approx. 0Ω
      Fig 2: Measuring Resistance Between Terminals 2 Of Injector Harness Connector And 50 Of ECM Harness Connector

      
3. Is resistance within the specification?

   YES

   1. Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure

   NO

   1. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.