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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) >> Power Circuits (Discovery Series II)
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Power Circuits (Discovery Series II)

  1. Turn ignition off. Using a backprobe set, check for voltage between ground and ECM Black 9-pin connector C0634 terminal No. 7 (Purple/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, check for open or short in Purple/Yellow wire between ECM and fuse No. 12 (20-amp) located in engine compartment fuse/relay box. See Figure and Figure . See WIRING DIAGRAMS . Perform repairs as necessary.
  2. Turn ignition off. Using a backprobe set, measure voltage between ground and ECM Black 24-pin connector C0635 terminal No. 23 (Blue/Red wire). See WIRING DIAGRAMS . If battery voltage does not exist, ensure inertia switch is closed. If necessary, reset inertia switch and recheck for voltage. If inertia switch is closed, check circuit between ECM, main relay, inertia switch and fuse No. 13 (15-amp), located in engine compartment fuse/relay box. Perform repairs as necessary.
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