5000CD Quattro Wagon (Canada) L5-2226cc 2.22L SOHC Turbo (MC) (1986)
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Unplug control unit connector
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Using ohmmeter, check for continuity between terminal 2 of cold start valve connector and terminal 1 of control unit connector A
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Specification: approx. 0.2 ohm
If ohmmeter reading NOT OK
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Check for open circuit in wiring according to current flow diagram
If wiring OK
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Replace control unit