W/Harness Inspection

Engine Control
P0073 Ambient Air Temperature Circuit High - Inspection/Repair:_:W/Harness Inspection

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?






Signal Circuit Inspection

1. Ignition "OFF".
2. Disconnect AAT Control connector.
3. Measure voltage between signal terminal of the AAT signal harness connector and chassis ground.

Specification:5 V




4. Is voltage within the specification?






Ground Circuit Inspection

1. IG "OFF".
2. Disconnect AAT connector.
3. IG "ON" & ENG "OFF".
4. Measure voltage between signal terminals of AAT harness connector and chassis ground.(Fig.1)
5. Measure voltage between signal terminals and ground terminal of AAT connector.(Fig.2)

Specification :(Fig.1) - (Fig.2) = below 200mV








6. Is the measured voltage within specification ?