S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
Specified value: 730 to 1000 ohms (at approx. 20° C)
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Check Engine Speed (RPM) Sensor (G28) terminals 1 to 2 and 1 to 3 for short circuits.
Specified value: infinite (infinity)
If any of the specified values are not obtained:
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Replace the Engine Speed (RPM) Sensor (G28) Refer to Fuel Injection and Ignition Repair Information.
If the specified values are obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623). Refer to => [ Engine Control Module, Replacing ] See: Engine Control
Module/Service and Repair.
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Using a Multimeter, check the Engine Speed (RPM) Sensor (G28) electrical harness connector terminals to the Motronic Engine Control Module
(ECM) (J623) electrical harness connector T121 terminals for an open circuit.