On-Vehicle Inspection

INSPECT IDLE AIR CONTROL VALVE ASSY
NOTE:
- Since the Idle Speed Control Valve (IAC valve) has an internal 1C circuit which converts the ECM duty signal Into the drive signal, it Is Impossible to check its resister valve and valve operation with the valve alone.
- Clear the DTC after inspection.
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 ON.
Movement:

Half open --> fully close --> fully open --> half open

HINT:

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

Fig 1: Identifying Valve Movement
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