On-Vehicle Inspection

INSPECT IDLE AIR CONTROL VALVE ASSY
NOTE:
- Since the Idle Air Control Valve (IAC valve) has an internal IC circuit which converts the ECM duty signal into the drive signal, therefore its resistance value and valve operation are impossible to check with the actuator alone.
- Clear the DTC after inspection.
Fig 1: Identifying Idle Air Control Valve Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

DTC P0505 will be set when the valve is stuck.
1. Check the operation.
  1. Connect the IAC valve connector to the IAC valve.
  2. Check the valve movement when the ignition switch is turned to ON.
  Movement:
  
  Half open --> fully close --> fully open --> half open
HINT:

The series of the valve movement mentioned above is done within 0.5 second.