ignition AUDI A4 1997 B5 / 1.G AFC Engine Idle Air Control Valve Checking Workshop Manual

24-38

Checking mechanical function

- Remove Idle Air Control (IAC) valve.

CAUTION!
Do not check for ease of movement by prying on the rotary slide
using a screwdriver or other tools that could potentially cause
scratching.
If there are signs of scoring that impair free movement, or if the rotary
slide does not move freely (sticks, moves slowly or does not move fully in
both directions):
If the valve does not react (not triggered) during the output Diagnostic
Test Mode: - Visually check surface of rotary slide (arrow) for signs of wear.
- Re-connect valve (still removed) to harness connector.
- Switch ignition ON.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger Idle
Air Control (IAC) valve -N71- Repair Group 01. - Check whether rotary slide moves smoothly and freely from stop to
stop.
- Replace Idle Air Control (IAC) valve.
- Check triggering.
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