S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Engine Speed Sensor: Description and Operation
NOTE:
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The engine speed signal is taken from terminal 37 on the Engine Control Module (ECM).
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The signal is used for various functions including the RPM display in the instrument cluster.
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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.
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Check wiring from test box socket 37 to instrument cluster according to wiring diagram for an open circuit.
