2000 Land Rover DiscoveryFACTORY OEM SERVICE PROCEDURE

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 .
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.