90S Quattro (Canada) V6-2.8L (AAH) (1993)
Speedometer Head: Testing and Inspection
Speedometer Vehicle Speed Sensor (VSS) Signal, Checking
Speedometer Vehicle Speed Sensor (VSS) signal, checking
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Remove instrument cluster. See: Instrument Cluster/Service and Repair
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Disconnect blue 26-pin harness connector from instrument cluster.
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Connect VAG1598/4 adapter to blue 26-pin connector.
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Connect VAG1598/4 adapter to VAG1598 test box.
Do not connect adapter to instrument cluster; leave the instrument cluster disconnected.
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Set digital multimeter (Fluke 83 or equivalent) to resistance (Ohm) measuring range.
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Connect multimeter between test box sockets 20 and 21.
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Release parking brake, shift transmission into Neutral, and move vehicle forward or backward slightly.
Specification: alternating between 0 Ohms (continuity) and infinite Ohms (no continuity)
If specification is not met:
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Check for open circuit in wiring according to wiring diagram, and repair as necessary.
If resistance is OK and the speedometer is not working:
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Check power supply voltage from speedometer according to wiring diagram.
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Replace speedometer if necessary.