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Home >> Jaguar >> 1992 >> XJS 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pump Circuit (XJS)
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Fuel Pump Circuit (XJS)

  1. Turn ignition on. Fuel pump should run for 1-2 seconds and then stop. If fuel pump operates as specified, fuel pump circuit is okay. If fuel pump is inoperative, go to next step.
  2. Ensure inertia switch cut-out button is in down position. Inertia switch is located on passenger-side footwell on front door pillar. If inertia switch cut-out button is in down position, go to next step. If inertia switch cut-out button is in up position, push button down to reset. Repeat step 1).
  3. Remove connectors from inertia switch. Using ohmmeter, check for continuity across switch terminals. Continuity should exist. With cut-out button in up position, continuity should not exist. If inertia switch operation is as specified, push cut-out button in down position and go to next step. Replace inertia switch if operation is not as specified.
  4. Using a jumper wire, ground fuel pump relay terminal No. 85. Relay is located inside trunk behind right trim panel next to ECU. Fuel pump relay is Silver with a Yellow/Black connector.
    NOTE: Fuel pump relay and main relay terminal identification is stamped on each relay case.
  5. Measure voltage at fuel pump relay terminal No. 30 (Brown wire) and main relay terminal No. 30 (Brown wire). Battery voltage should be present at each terminal. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Brown wire between relay(s) and battery junction block. Junction block is located below battery.
  6. Turn ignition on. Measure voltage at main relay terminal No. 86. Main relay (Silver with Red stripe) is located next to fuel pump relay. If battery voltage is present, go to next step. If battery voltage is not present, check for open in White wire between ignition switch and inertia switch or White/Orange wire between inertia switch and terminal No. 86. Repair wire as necessary.
  7. Measure voltage at main relay terminal No. 87. If battery voltage is present, go to next step. If battery voltage is not present, replace main relay.
  8. Measure voltage at fuel pump relay No. 86. If battery voltage is present, go to next step. If battery voltage is not present, repair open in wire between main relay terminal No.87 and fuel pump relay terminal No. 86.
  9. Measure voltage at fuel pump relay terminal No. 87. If battery voltage is present, go to next step. If battery voltage is not present, replace fuel pump relay.
  10. Measure voltage at fuel pump Brown/Gray wire. If battery voltage is not present, repair open in Brown/Grey wire between fuel pump and fuel pump relay. If battery voltage is present and fuel pump ground connections are good, replace fuel pump.
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