A4 Quattro Sedan V6-2.8L (ACK) (1997)
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Initiate output Diagnostic Test Mode (DIM) and advance to test of cylinder 1 fuel injector -N30-.
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LED test light must light up
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Fuel pump relay must be activated
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Fuel pump must run
If the LED test light does not light up:
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Repeat test at other terminal of fuse 34.
If the LED test light still does not light up:
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Check wiring for open circuit between fuse 34 and terminal 31 at relay position 6, using the applicable wiring diagram. Repair wiring as necessary.
Specified value: max. 1.5 ohms
Checking fuel pump relay voltage supply and actuation
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Remove fuel pump relay -J17- from relay panel position 6.
Checking fuel pump relay voltage supply
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Switch ignition on.
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Connect multimeter US1119 (Fluke 83 or similar) and check for voltage at relay socket:
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Terminals 28 (B+) and 34
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Terminals 32 (B+) and 34
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Specified values: approx. Battery Positive Voltage (B+)
If voltage is NOT OK:
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Repair wiring according to applicable wiring diagram.
Checking fuel pump relay actuation