Control Circuit Inspection

Check for Short to Ground in Control Circuit

1. Ignition "OFF" & Relay connector: Disconnected
2. Measure resistance between terminal 4 of the relay harness connector and chassis ground.
   1. Specification: Infinite
      Fig 1: Measuring Resistance Between Terminal 4 Of Relay Harness Connector And Chassis Ground

      
3. Is resistance 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 Short to Power in Control Circuit

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

      
4. 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 Harness

1. Measure resistance between terminals 4 of the relay harness connector and 35 of the ECM harness connector.
   1. Specification: Approx 0Ω
      Fig 3: Measuring Resistance Between Terminals 4 Of Relay Harness Connector And 35 Of ECM Harness Connector

      
2. Is resistance within the specification?

   YES

   1. Thoroughly 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.