S6 Wagon L5-2226cc 2.22L DOHC Turbo (AAN) (1995)
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Binds.
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Runs slowly.
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Will not travel to both stops.
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Replace IAC valve.
Checking Control Signal
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Disconnect harness connector for IAC valve.
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Connect US 1115 LED tester or equivalent (using adapter cable from connectortest kit VW 1594) between terminal 1 of harness connector and
engine Ground (GND).
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Crank starter for a few seconds.
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LED tester must light up.
If NO:
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Verify that injector valve circuit breaker -S72- and EVAP frequency valve circuit breaker -S75- in electronic control box are OK.
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Check continuity between terminal 1 of IAC valve harness connector and EVAP frequency valve circuit breaker -S75-, using wiring diagram.
^
Must be 0.5 ohm maximum.
Central Electric Panel With Detail Of Relay Position 6
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Check continuity between EVAP frequency valve circuit breaker -S75- and terminal 31 of fuel pump relay -J17- (relay location 6).
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Check control signal to fuel pump relay.
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Reconnect LED tester.
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Activate Output DTM.
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LED tester must light up.
Note: Positive voltage supply must always be present at terminal 1, regardless of which Output DTM is called up.
If LED tester does NOT light up:
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Connect VAG 1598 Test Box (using VAG 1598/5 adapter cable), to Engine Control Module (ECM) harness connector. Refer to VAG 1598 Pin
Out Box Connecting See: Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial
Checks/Connecting and Testing VAG 1598 Pin Out Box
^
ECM remains disconnected.
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Check continuity (according to wiring diagram) between terminal 1 of IAC valve harness connector and terminal 37 of Test Box.
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Must be 0.5 ohm maximum.
If NO continuity:
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Repair open circuit between terminal 37 of ECM harness connector and terminal 1 of IAC valve harness connector.
If NO open circuit:
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Replace ECM.
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Remove Test Box and VAG 1598/5 adapter cable.
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Reconnect ECM.
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Connect LED tester (using adapter cable) to terminals 1 and 2 of IAC valve harness connector.
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Activate Output DTM.
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LED tester must blink when IAC valve is activated (blinking may be weak but must occur).
If LED tester does NOT blink, or if it lights up continuously:
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Connect VAG 1598 Test Box (using VAG 1598/5 adapter cable), to ECM harness connector.
^
ECM remains disconnected
If LED tester is continuously lit:
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Check for continuity between terminal 2 of IAC valve harness connector and terminal 4 of Test Box.
If LED tester does NOT blink:
