W/Harness Inspection

P0507 Idle Air Control System

RPM higher than expected - Inspection/Repair:_:W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness 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 "Power circuit inspection" procedure.

Power Supply Circuit Inspection

1. Key "OFF".
2. Disconnect ISCA connector.
3. Key "ON".
4. Measure the voltage between terminal 2 of ISCA harness connector and chassis ground.
A. Specification : B+




5. Is the measured voltage within specification?
YES
1) Go to "Control circuit inspection" procedure.
NO
1) Repair Open or Short in power circuit and then, go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

1. Key "OFF".
2. Disconnect ISCA connector and Key "ON".
3. Measure the voltage between terminal 1 of ISCA harness connector and chassis ground.
4. Measure the voltage between terminal 3 of ISCA harness connector and chassis ground.
A. Specification : Approx 1.3 V (at terminal 1), Approx 2 V (at terminal 3)




5. Is the measured voltage within specification?
YES
1) Go to "System inspection" procedure.
NO
1) Repair Open or Short in control circuit and then, go to "Verification of Vehicle Repair" procedure.