Allroad Quattro V6-2.7L Turbo (APB) (2002)
If specified value is not obtained, check wire connections.
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Connect multimeter to terminal 3 and terminal 1 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 (Hitachi 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: Computers and Control Systems/Testing and Inspection
The following wire connections must be checked for short circuit to B+, Ground (GND) and for open circuit
Connector for Mass
VAG1598/31 test box
Air Flow (MAF)
terminal
sensor -G70-
1
53
3
27
4
29
Voltage supply for Mass Air Flow (MAF) sensor, checking (Bosch MAF sensor)
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Disconnect connector from Mass Air Flow (MAF) sensor.
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Connect multimeter to terminal 2 of connector and engine Ground (GND) for voltage measurement.
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Operate starter briefly.
Specification: approx. battery voltage
NOTE: Voltage is supplied to Mass Air Flow (MAF) sensor from Fuel Pump (FP) relay.