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Home >> Land Rover >> 2000 >> Discovery >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Computerized Engine Controls (BOSCH) >> Engine Control Module (ECM) >> Ground Circuits (Discovery Series II & Range Rover)
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Ground Circuits (Discovery Series II & Range Rover)

  1. Using a backprobe set, check for continuity in Black wires between ground and ECM Black 9-pin connector C0634 terminals No. 4, 5, and 6, Black 52-pin connector C0636 terminal No. 17 and Gray 9-pin connector C0638 terminal No. 5, individually. See Figure and Figure . See WIRING DIAGRAMS . On Discovery Series II, ground connection is located at right rear side of engine compartment. On Range Rover, ground connection is located at right side of engine compartment, near the horn. If continuity exists, go to next step. If continuity does not exist, repair open in suspect Black wire.
  2. Start engine and allow to idle. Using a backprobe set, measure voltage between ground and ECM Black 9-pin connector C0634 terminals No. 4, 5, and 6, Black 52-pin connector C0636 terminal No. 17 and Gray 9-pin connector C0638 terminal No. 5, individually. Voltage should be less than one volt. If voltage is greater than one volt, check for an open, corrosion or loose ground connection. See WIRING DIAGRAMS .
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