Golf GTI L4-1781cc 1.8L SOHC (HT) (1985)
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unplug OXS thermoswitch connectors (arrow)
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check reading displayed on VW 1367
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must be steady 50% +/- 2% (45 +/- 2~ dwell)
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bridge terminals of OXS thermoswitch connectors (arrows)
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check reading displayed on VW 1367
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must be steady 80% +/- 2% (72 +/- 2~ dwell)
If either reading NOT OK
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check for open circuit in wiring between connector and OXS control unit
If wiring OK
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replace OXS control unit
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remove bridge at connectors
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check continuity of OXS thermoswitch with ohmmeter
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above 30~C (86~F) = infinite Ohms
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below 20~C (68~F) = 0 Ohms
If readings NOT OK
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replace thermoswitch