W/Harness Inspection

Power Supply Circuit Inspection

1. Ignition "ON" & Engine "OFF"
2. Measure voltage between terminal 2 of the valve harness connector and chassis ground
A. Specification : Approx. B+




3. Is voltage within the Specification?
YES
1) Go to next step as below
NO
1) Check for an open or short to ground in the power supply circuit between the ISCA valve and main relay. Repair as necessary and go to "Verification of Vehicle Repair" procedure

Signal Circuit Inspection

1. Measure voltage between terminal 1 of the valve harness connector and chassis ground
A. Specification : Approx. 2-4V




2. 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

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
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