light AUDI A4 1995 B5 / 1.G AFC Engine Idle Air Control Valve Checking Workshop Manual

24-39

Checking Idle Air Control (IAC) valve
triggering

Idle Air Control (IAC) valve electrically OK

- Slide up boot on Idle Air Control (IAC) valve
connector.

- Use scan tool "Output Diagnostic Test Mode"
function 03 to trigger Idle Air Control (IAC) valve
-N71- Repair Group 01.

If specified results are not obtained: - Connect VAG 1527B voltage tester between connector terminal 1 and
engine Ground (GND).
Specified result: voltage tester must flash
- Connect voltage tester between connector terminal 2 and battery
positive voltage (B+).
Specified result: voltage tester must light up
- Connect VAG 1598/19 test box to ECM harness connector (ECM is left
disconnected) Repair Group 01.
Pa
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(IAC
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