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Home >> Suzuki >> 1990 >> Samurai >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel Pump Relay Location >> Fuel Pump Circuit Test (Swift DOHC)
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Fuel Pump Circuit Test (Swift DOHC)

  1. Turn ignition on. Operating sound of fuel pump should be heard for 3 seconds. If fuel pump operating sound is heard, fuel pump circuit is okay. If fuel pump operating sound is not heard, go to next step.
  2. Remove fuel pump relay with connector from main fuse box, located near battery. See Figure . With fuel pump relay connected, ensure voltage exists at White/Blue wire. If not, check EFI main relay. See EFI MAIN RELAY under RELAYS & SOLENOIDS  in this article. Install a jumper wire between fuel pump relay Pink and White/Blue wires. Turn ignition on, engine off. This will activate fuel pump.
  3. If fuel pump activates, go to next step. If fuel pump does not activate, check fuel pump relay connector for poor connection and fuel pump relay Pink wire for an open. If okay, check for faulty fuel pump. See the BASIC TESTING article in this section.
  4. If fuel pump activates when fuel pump relay is jumped, check ignition fuse. If ignition fuse is okay, check for faulty fuel pump relay. See FUEL PUMP RELAY under RELAYS & SOLENOIDS  in this article. If fuel pump relay is okay, check for open or poor connection between ECM and fuel pump relay Pink/White wire. If wire is okay, substitute a known good ECM and retest.
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