S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Fuel Pump Relay: Testing and Inspection
Checking fuel pump relay
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Remove console in left front footwell.
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Unfasten passenger-side A-pillar lower trim.
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Fold back carpet in right front footwell.
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Remove cover from electronics box.
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Remove Heated Oxygen Sensor (HO2S) circuit breaker -S73-.
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Located in yellow holder in auxiliary relay carrier tube (on A-pillar, right).
Central Electronics Box
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Remove the following:
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Evaporative Emission (EVAP) frequency valve circuit breaker -S75- (position -1-, black holder).
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Injector valve circuit breaker -S72- (position -2-, brown holder).
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Remove fuse 17 from fuse holder.
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Connect LED tester US 1115 or equivalent between Ground (GND) and either terminal of fuse 17, using adapter cables from connector test kit
VW 1594.
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Operate starter briefly.
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Fuel pump must begin running
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LED tester must light up
If fuel pump does NOT activate:
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Check control signal.
If LED tester does NOT light up:
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Repeat test on other terminal of fuse 17.
Central Electric Panel With Detail Of Relay Position 6
If LED tester still does NOT light up
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Check continuity (according to wiring diagram) between fuse 17, and terminal 30 (central electric panel relay position 6).
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Repair or replace wiring, as necessary.