A4 Sedan V6-2.8L (AFC) (1996)
Variable Induction Control Valve: Testing and Inspection
Component locations, refer to "Component Overview - II", See: Locations
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Disconnect intake manifold change-over valve harness connector.
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Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and connect between terminals on valve
Specified value: 25 to 35 ohms (ohms)
If the specified value is not obtained:
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Replace intake manifold change-over valve.
Checking voltage supply
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Disconnect intake manifold change-over valve harness connector.
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Connect VAG 1527B voltage tester between harness connector terminal 1 and Ground (GND) using jumper wires from connector test kit VW
1594.
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Use scan tool "Output Diagnostic lest Mode" function 03 to trigger fuel pump relay -J17-.
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Voltage tester must light up
If voltage tester does not light up:
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Check fuse for intake manifold change-over valve.
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Check wiring for continuity between intake manifold change-over valve harness connector terminal 1 and fuse, using wiring diagram.
Specified value: max. 1.0 ohms
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Check fuel pump relay and triggering, See: Fuel Pump/Fuel Pump Relay/Testing and Inspection
Checking triggering
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Connect VAG 1527B voltage tester between intake manifold change-over valve connector terminal 1 (B+) and 2 using jumper wires from
connector test kit VW 1594.
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Use scan tool "Output Diagnostic Test Mode" function 03 to trigger Intake manifold change-over valve.
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Voltage tester must flash
If voltage tester does not flash, or lights up constantly:
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Connect VAG 1598/19 test box to ECM.
If voltage tester lights constantly:
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Check wiring from intake manifold change-over valve connector terminal 2 to test box socket B4 to Ground (GND).
If voltage tester does not flash: