Allroad Quattro V6-2.7L Turbo (APB) (2002)
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If diode test lamp still does not light up, test for open circuit in wiring between fuel pump fuse and terminal 23 in relay position 4. If necessary,
rectify open circuit.
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If voltage supply, activation and wiring for fuel pump relay are OK, install new fuel pump relay.
B -
Checking voltage supply and activation of fuel pump relay
NOTE: Activation of the fuel pump relay can also be tested using the final control diagnosis. Refer to "Scan Tool Testing/Output Diagnostic Test
Mode (DTM)" See: Computers and Control Systems/Testing and Inspection
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Remove fuel pump relay -J17 from central electrics, relay position 4.
Checking voltage supply
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Switch ignition on.
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Connect hand-held multimeter VAG1526 between Ground (GND) and relay panel contact 19 (B+; terminal 15 from ignition switch). Disconnect,
then re-connect between Ground (GND) and relay panel contact 17(permanent B+; terminal 30 from battery).
Specification: approx. battery voltage in each case
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If values are not as specified, rectify open circuit.
Checking activation