Signal Circuit Inspection

Check for Open in Harness 

1. IG KEY: OFF, Engine: OFF
2. Disconnect IG failure sensor connector B-12 and ECM connector.
3. Measure resistance between terminal 3 of the IG failure sensor harness connector B-12 and B5 of ECM harness connector B-01.
   1. Specification: 0Ω
      Fig 1: Measuring Resistance Between Terminal 3 Of IG Failure Sensor Harness Connector B-12 And B5 Of ECM Harness Connector B-01

      
4. Is the resistance near the specified value?

   YES

   1. Go to "Check for Short to Ground in Harness" procedure.

   NO

   1. Repair open in harness, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check for Short to Ground in Harness 

1. IG KEY: OFF, Engine: OFF
2. Disconnect IG failure sensor connector B-12 and ECM connector.
3. Measure resistance between terminal 3 of the IG failure sensor harness connector B-12 and chassis ground.
   1. Specification: infinite
      Fig 2: Measuring Resistance Between Terminal 3 Of IG Failure Sensor Harness Connector B-12 And Chassis Ground

      
4. Does the resistance indicate open?

   YES

   1. Go to "Check for Short to Battery in Harness" procedure.

   NO

   1. Repair short to chassis ground in harness, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check for Short to Battery in Harness 

1. IG KEY: OFF, Engine: OFF
2. Disconnect IG failure sensor connector B-12 and ECM connector.
3. IG KEY: ON, Engine: OFF
4. Measure voltage between terminal 3 of the IG failure sensor harness connector B-12 and chassis ground.
   1. Specification: Approx. 0V
      Fig 3: Measuring Voltage Between Terminal 3 Of IG Failure Sensor Harness Connector B-12 And Chassis Ground

      
5. Is the voltage near the specified value?

   YES

   1. Go to "COMPONENT INSPECTION " procedure.

   NO

   1. Repair short to battery in harness, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.