A4 Sedan V6-2.8L (AFC) (1996)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
NOTE: To functionally check the idle speed control system, refer to "Read Measuring Valve Block" function 08, display group 004 through 018.
Electrical checks
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Disconnect Idle Air Control (IAC) valve harness connector.
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Measure IAC valve resistance by connecting multimeter (Fluke 83 or equivalent) between connector terminals using jumper wires from connector
test kit VW 1594.
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Specified value: 7 to 11 ohms
If the specified resistance is not obtained:
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Replace Idle Air Control (IAC) valve.
NOTE: At room temperature, the resistance value will be lower. The resistance value will be higher if the Idle Air Control (IAC) valve is measured at
under-hood operating temperatures.
Checking mechanical function
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Remove Idle Air Control (IAC) valve.
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Visually check surface of rotary slide (arrow) for signs of wear.