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Fuel System Pressure Test: 1.0L

  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 . Connect negative battery cable. Install Fuel Pressure Gauge (J-34730-1A). 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  10.
  3. 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 23-31 psi (1.6-2.2 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step  9.
  4. Turn ignition off. Observe fuel pressure for one minute after fuel pump stops. If fuel pressure remains stable at 13 psi (0.9 kg/cm2 ) or greater, diagnose fuel pump electrical circuit. See appropriate diagnostic procedure under NO START DIAGNOSIS . If fuel pressure does not remain stable as specified, go to next step.
  5. Check for leaking fuel injector, or fuel feed pipes and hoses. Repair as necessary. After repairs, go to step  18. If injector and fuel feed pipes and hoses are okay, go to next step.
  6. Turn ignition on with engine off. 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 23 psi (1.6 kg/cm2 ), go to step  17. If fuel pressure does not remain stable at 23 psi (1.6 kg/cm2 ), go to next step.
  7. 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 23 psi (1.6 kg/cm2 ) or greater, go to step  16. If fuel pressure does not remain stable at 23 psi (1.6 kg/cm2 ) or greater, go to next step.
  8. Check for leaking fuel injector, fuel pressure regulator or throttle body. Repair or replace as necessary. After repairs, go to step  18.
  9. If fuel pressure is less than 23 psi (1.6 kg/cm2 ), go to next step. If fuel pressure is 23 psi (1.6 kg/cm2 ) or greater, go to step  13.
  10. Turn ignition on. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. If fuel pressure remains stable at 45 psi (3.2 kg/cm2 ) or greater, go to step  16. If fuel pressure does not remain stable as specified, go to next step.
  11. Check for a restricted fuel feed pipe or fuel filter. Repair as necessary. After repairs, go to step  18. If fuel feed pipe and fuel filter are okay, go to next step.
  12. Check for leaks or restrictions in fuel pump hoses, and connections in fuel tank. Ensure fuel pump battery feed and ground circuits are okay. Repair as necessary. After repairs, go to step  18. If hoses and connections are okay, go to step  17.
  13. If fuel pressure is greater than 31 psi (2.2 kg/cm2 ), go to next step.
  14. 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 23-31 psi (1.6-2.2 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step  16.
  15. Repair or replace restricted fuel return pipe or hose. After repairs, go to step  18.
  16. Fuel pressure regulator is faulty. Replace throttle body assembly. After repairs, go to step  18.
  17. Replace fuel pump. After repairs, go to next step.
  18. Operate system to verify repairs. 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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