W/Harness Inspection

Ground Circuit inspection

1. Ignition "OFF"
2. Disconnect ECM connector
3. Measure resistance between terminals 1 of the sensor harness connector and 9 of the ECM harness connector
A. Specification : Approx. 0 Ohm




4. Is resistance within the specification?
YES
1) Go to "Signal Circuit Inspection" procedure
NO
1) Repair open circuit and go to "Verification of Vehicle Repair" procedure

Signal Circuit Inspection

Check for Open in Signal Circuit
1. Measure resistance between terminals 5 of the sensor harness connector and 18 of the ECM harness connector
A. Specification : Approx. 0 Ohm




2. 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 Battery in Signal Circuit
1. Ignition "ON" & Engine "OFF"
2. With IATS and ECM connector still disconnected, measure voltage between terminals 5 of sensor harness connector and 18 of the ECM harness connector
A. Specification : Approx. 0V




3. Is voltage within the specification?
YES
1) Go to "Terminal and Connector Inspection" procedure.
NO
1) Repair open circuit 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) Go to "Component Inspection" procedure