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Home >> Land Rover >> 1995 >> Range Rover SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 4.0L & 4.6L >> Modules, Motors, Relays & Solenoids >> Relays >> Fuel Pump Relay

Fuel Pump Relay

  1. Fuel pump relay is in engine compartment fuse box, which is located on right side of engine compartment. Before checking fuel pump relay, check inertia fuel shut-off switch located on engine compartment firewall. Check for continuity between inertia fuel shut-off switch terminals No. 1 (White/Orange wire) and No. 3 (White/Blue wire). If continuity exists, go to next step. If continuity does not exist, depress inertia fuel shut-off switch plunger to reset switch. If continuity still does exist, replace inertia fuel shut-off switch.
  2. Turn ignition on. Measure voltage between ground and fuel pump relay terminal No. 1, located in engine compartment fuse box. See WIRING DIAGRAMS . If battery voltage exists, go to next step. If battery voltage does not exist, repair power supply circuit between fuse box and battery. See appropriate POWER DISTRIBUTION wiring diagram in the SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section.
  3. Turn ignition off. Measure voltage between ground and fuel pump relay terminal No. 3. If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 39 (10-amp). If necessary, replace fuse, and repair power supply circuit between fuse box and battery. See appropriate POWER DISTRIBUTION wiring diagram in SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section.
  4. Turn ignition off. Disconnect all 3 ECM connectors. Check for continuity in Blue/Purple wire between ECM Black 36-pin connector terminal No. 24 and engine compartment fuse box Pink 8-pin connector terminal No. 4. See Figure. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Blue/Purple wire.
  5. Using a fused jumper wire and backprobe set, connect the ECM Black 36-pin connector terminal No. 24 (Blue/Purple wire) to ground. See Figure. See WIRING DIAGRAMS . Turn ignition on. Check fuel pump operation. If fuel pump is not operating, go to next step. If fuel pump is operating, substitute a known-good ECM and recheck for original symptom or indication. If symptom or indication goes away, replace original ECM.
  6. Measure voltage between ground and engine compartment fuse box Gray 8-pin connector terminal No. 1 (White/Orange wire). If battery voltage exists, repair open in circuit between engine compartment fuse box, inertia fuel shut-off switch and fuel pump. If battery voltage does not exist, recheck fuse No. 39 (10-amp). If fuse is okay, replace fuel pump relay. If fuse is not okay, repair short in circuit between engine compartment fuse box, inertia fuel shut-off switch and fuel pump.
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