Tacoma PreRunner Reg Cab 2WD L4-2.7L (3RZ-FE) (1999)
Idle Air Control Valve: Diagnostic Trouble Code Tests and Associated Procedures
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the intake air chamber and intake air bypassing the throttle valve is directed to the IAC valve
through a passage.
In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle-up and provide feedback for the target idling speed.
DETECTING CONDITIONS
WIRING DIAGRAM