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Home >> Land Rover >> 1999 >> Discovery SD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Idle Control System (Gems) >> Park/Neutral Switch >> Park/Neutral Switch
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Park/Neutral Switch

Turn ignition on. Using a backprobe set, measure voltage at ECM Red 36-pin connector terminal No. 18 (Orange/Black wire). With shift lever in Park or Neutral voltage should be zero. With shift lever in Drive, battery voltage should exist.

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