A6 Quattro Sedan V6-2.7L Turbo (APB) (2000)
If there is no battery voltage.
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Check wire connection from terminal 2 of connector to Fuel Pump (FP) relay via fuse for open circuit and short circuit to Ground (GND), repair if
necessary.
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Connect multimeter to terminal 2 and terminal 3 of connector for voltage measurement.
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Operate starter briefly.
Specification: approx. battery voltage
NOTE: Ground (GND) from the ECM is present at terminal 3 of connector.
If specified value is not obtained, check wire connections.
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Connect multimeter to terminal 3 and terminal 4 of connector for voltage measurement.
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Switch ignition on.
Specification: approx. 5 volts.
If specified value is not obtained, check wire connections.
Wire connections for Mass Air Flow (MAF) sensor, checking (Bosch MAF sensor)
NOTE: Signal wire is also checked during wire test
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial
Checks/Connecting VAG1598/31 Test Box" See: Testing and Inspection