Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

COMPONENT DESCRIPTION
IACV-AAC valve
The IAC valve-AAC valve is moved by open and close signals from the ECM. When the open signal is sent to the valve, the amount of air that will flow through the valve increases. The more air that flows through the valve, the higher the idle speed. When the close signal is sent to the valve, the amount of air decreases.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Procedure for malfunction A
WITH CONSULT
1) Turn ignition switch "ON".
2) Select "DATA MONITOR" mode with CONSULT.
3) Start engine and run it at idle for at least 2 seconds.

OR

WITH GST
1) Start engine and run it at idle for at least 2 seconds.
2) Select "MODE 3" with GST.

OR

WITH NO TOOLS
1) Start engine and run it at idle for at least 2 seconds.
2) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

Procedure for malfunction B
WITH CONSULT
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Turn ignition switch "ON" again and select "DATA MONITOR" mode with CONSULT.
4) Start engine and run it for at least 30 seconds at idle speed.

OR

WITH GST
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Start engine again and run it for at least 30 seconds at idle speed.
4) Select "MODE 3" with GST.

OR

WITH NO TOOLS
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Start engine again and run it for at least 30 seconds at idle speed.
4) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
5) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.




WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Disconnect IACV-AAC valve harness connector.




Check resistance between terminals (2) and (3), (3) and (4).

Resistance: 50 - 100 Ohms at 25°C (77°F)

If NG replace IACV-AAC valve.