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Fuel System Pressure Test: 1.3L

  1. Perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF . Install Fuel Pressure Gauge (J-34730-1A). Reconnect negative battery cable. Turn ignition on. Fuel pump should run for about 2 seconds. If fuel pressure is present, go to next step. If fuel pressure is not present, go to step  13.
  3. Turn ignition off. Turn ignition on. Fuel pump should run for about 2 seconds. Observe fuel pressure with fuel pump running. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. Fuel pressure reading should be 39-44 psi (2.7-3.1 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step  11.
  4. Turn ignition off. Observe fuel pressure for one minute after fuel pump stops. If fuel pressure remains stable at 29 psi (2.0 kg/cm2 ) or greater, go to next step. If fuel pressure does not remain stable at 29 psi (2.0 kg/cm2 ) or greater, go to step  7.
  5. Start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
  6. Allow engine to reach normal operating temperature. Observe fuel pressure gauge. Fuel pressure reading should be 29-35 psi (2.0-2.5 kg/cm2 ). If fuel pressure is within specification, system is okay. If fuel pressure is not within specification, go to step  9.
  7. Check for leaking fuel injectors, fuel feed pipes and hoses. Repair as necessary. After repairs, go to step  19. If injectors, fuel feed pipes and hoses are okay, go to next step.
  8. Turn ignition on. Fuel pump should run for about 2 seconds. Pinch fuel feed hose before fuel pressure gauge and check fuel pressure. If fuel pressure remains stable at 39 psi (2.7 kg/cm2 ), go to step  18. If fuel pressure does not remain stable at 39 psi (2.7 kg/cm2 ), go to next step.
  9. Turn ignition on. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. If fuel pressure remains stable at 39 psi (2.7 kg/cm2 ) or greater, go to step  17. If fuel pressure does not remain stable at 39 psi (2.7 kg/cm2 ) or greater, go to next step.
  10. Check for leaking fuel injectors, fuel pressure regulator or fuel pump check valve. Repair or replace as necessary. After repairs, go to step  19.
  11. If fuel pressure is less than 39 psi (2.7 kg/cm2 ), go to next step. If fuel pressure is not less than 39 psi (2.7 kg/cm2 ), go to step  15.
  12. Turn ignition on. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. Cycle ignition on and off several times to establish an accurate reading. Record maximum fuel pressure. If fuel pressure remains stable at 64 psi (4.5 kg/cm2 ) or greater, go to step  17. If fuel pressure does not remain stable at 64 psi (4.5 kg/cm2 ) or greater, go to next step.
  13. If fuel pump relay circuit has been diagnosed, go to next step. If fuel pump relay circuit has not been diagnosed, see appropriate diagnostic procedure under NO START DIAGNOSIS .
  14. Check for leaks or restrictions in fuel pump hoses, fuel filter and connections in fuel tank. Ensure fuel pump battery feed and ground circuits are okay. Repair as necessary. After repairs, go to step  19. If fuel feed pipe and hose are okay, go to step  18.
  15. Turn ignition off. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF . Disconnect fuel return hose from fuel pressure regulator. Connect flexible hose to fuel pressure regulator and place other end in container. Turn ignition on. Fuel pressure reading should be 39-44 psi (2.7-3.1 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step  17.
  16. Repair or replace restricted fuel return pipe or hose. After repairs, go to step  19.
  17. Replace fuel pressure regulator. After repairs, go to step  19.
  18. Replace fuel pump. After repairs, go to next step.
  19. Operate system to verify repair. If system operation is okay, testing is complete. If system operation is not okay, diagnose fuel pump electrical circuit. See appropriate diagnostic procedure under NO START DIAGNOSIS .
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