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Home >> Land Rover >> 2000 >> Range Rover SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Motors, Relays & Solenoids >> Main Relay Circuit >> Discovery Series II

Discovery Series II

  1. Main relay may also be called the engine main control relay. Main relay is in the engine compartment fuse/relay box which is located at the right side of the engine compartment. Battery voltage is supplied directly to engine compartment fuse/relay box through Red wire from battery.
  2. Before checking main relay, check inertia switch located on engine compartment firewall. Check for continuity between inertia switch terminals No. 1 (Brown/Black wire) and No. 3 (White/Green wire). If continuity exists, go to next step. If continuity does not exist, depress inertia switch plunger to reset switch. If continuity still does not exist, replace inertia switch.
  3. Turn ignition off. Remove main relay from engine compartment fuse/relay box. Measure voltage between ground and main relay connector terminal No. 85. See WIRING DIAGRAMS . If battery voltage is present, go to step  4. If battery voltage is not present, check fuse No. 13 (15-amp) located in engine compartment fuse/relay box. Preform repairs as necessary. If fuse is okay, go to next step.
  4. Measure voltage between ground and main relay connector terminal No. 30. See WIRING DIAGRAMS . If battery voltage is present, go to next step. If battery voltage is not present, repair open in circuit between main relay and battery. If circuit can not be repaired, replace engine compartment fuse/relay box.
  5. Using a backprobe set, check for continuity between main relay connector terminal No. 86 and ECM 24-pin connector terminal No. 23 (Blue/Red wire). See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in circuit between main relay and ECM.
  6. Check for continuity between main relay terminals No. 85 and 86. If continuity exists, go to next step. If continuity does not exist, replace main relay.
  7. Check for continuity between main relay terminals No. 30 and 87. If continuity does not exist, go to next step. If continuity exists, replace main relay.
  8. Using a fused jumper wire, connect battery voltage to main relay terminal No. 85. Using another jumper wire, connect main relay terminal No. 86 to ground. When main relay is energized, check for continuity between main relay terminals No. 30 and 87. If continuity does not exist, replace main relay.
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