S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Fuel Injector: Testing and Inspection
Electrical Checks
Checking fuel injectors electrically
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Disconnect harness connector from fuel injector to be tested.
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Switch Digital Volt Ohm Multimeter (DVOM) to resistance range.
Fuel Injector Testing
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Measure resistance of injector.
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Must be 15-17 ohms.
If NO:
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Replace any fuel injector that fails to meet specifications.
Checking fuel injector actuation
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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 electronic control box.
Central Electronics Box
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Remove injector valve circuit breaker -S72- (position -2-, brown holder).
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Check circuit breaker -S64- in red holder (position -3-).
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Remove harness connector from fuel injector to be tested.
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Connect LED tester US 1115 or equivalent between connector terminal 2 and engine Ground (GND).
2-Pin Connector
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Switch ignition ON.
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LED tester must light up