S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
NOTE:
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The reason why the value in display field 1 rises and the value in display field 2 falls is because the potentiometers (angle senders) in the throttle
valve control module work in opposite directions.
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The percentage value for the first potentiometer increases as the voltage rises towards 5 V because the voltage at this potentiometer increases as
the throttle valve opens.
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The percentage value for the second potentiometer decreases as the voltage drops away from 5 V and towards 0 V because the voltage at this
potentiometer decreases as the throttle valve opens.
Checking voltage supply to throttle valve control module
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Disconnect harness connector from throttle valve control module.
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Switch ignition on.
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Connect hand-held multimeter (voltage range) between the following sockets on connector:
6-pin connector on
Specification
wiring harness, socket
2 + Ground (GND)
approx. 5V
2 + 6
approx. 5V
If the specifications are not obtained, test wiring connections from engine control module to throttle valve control module.
If the readouts match the specifications, test also the signal wires and activation wires for the throttle valve positioner.
Checking wiring for voltage, signal and activation
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Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan
Tool Testing/Wiring And Component Check With VAG1598/31 Test Box" See: Testing and Inspection