A8 Sedan V8-3.7L (AEW) (1997)
If wiring is OK:
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Check Motronic ECM power supply relay. Refer to "Engine Control Module (ECM) Input Signals, Checking"
Checking actuation
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Connect VAG1527B LED voltage tester between harness connector terminals 1 (B+) and 2 (harness connector for air control valve remains
connected).
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Start engine.
LED must light up.
NOTE:
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When engine is cold, the LED will light up at idle.
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When engine is at normal operating temperature, LED lights up only above approx. 1500 RPM.
If LED does not light up:
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Connect VAG1598/19 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19
Test Box, Connecting" See: Testing and Inspection
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Check wiring between air control valve connector terminal 2 and ECM/test box socket D4.
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Check air hoses and lines (for air-shrouded fuel injectors) for leaks and blockage.
If air control valve, wiring, air hoses and lines are OK:
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Replace ECM and generate new readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code"
See: Testing and Inspection