100S Quattro Wagon (Canada) V6-2.8L (AAH) (1992)
Tachometer: Testing and Inspection
Engine Speed (RPM) Signal, Checking
RPM signal
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Connect VAG 1598/4 adapter harness to 26-point instrument cluster connector (green).
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Connect adapter harness to VAG 1598A test box
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Connect engine tester VW 1367 to measure RPM
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Connect signal wire (green terminal) of tester VW 1367 to socket 12 of VAG 1598A test box using connector test kit VW 1594.
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Start engine and let idle.
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Engine RPM must be displayed on VW 1367
If NOT
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Check wiring for open circuit according to wiring diagram, repair as necessary.