5000CD Quattro Sedan (Canada) L5-2226cc 2.22L SOHC Turbo (MC) (1988)
If tester is OFF:
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Connect multimeter US 1119 between blue/black wire of frequency valve harness connector and ground
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Approximately 12 Volts
If measurement NOT OK
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Check for open circuit in wiring using wiring diagram
If measurement OK
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Remove cover for control unit located in front passenger footwell
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Unplug control unit harness connector
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Using multimeter US 1119, check for continuity between terminal 19 of control unit harness connector and green/yellow wire of frequency valve
harness connector
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approximately 0.2 ohms
If measurement NOT OK
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Check for open circuit in wiring between connectors using wiring diagram
If wiring OK
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Replace control unit