3.
Remove the fuel pump installation screws, then remove the fuel pump assembly from the fuel tank.
Remove the fuel tank cap to lower the fuel tank's internal pressure.
Raise the vehicle and disconnect the fuel pump connector, then remove the fuel feed and return line from the fuel pump assembly.
Remove the fuel pump installation screws, then remove the fuel pump assembly from the fuel tank.
Remove the fuel sender & fuel filter from the fuel pump assembly.
Inspect and replace, if necessary.
Disconnect the intake air hose from the throttle body, and check the throttle valve surface for dirt. Spray cleaning solventon the face of the valve to remove dirt.
Warm up the engine, then stop it.
Remove the intake air hose from the throttle body.
Make sure the solvent does not enter the by-pass passage.
Spray cleaning solvent into the valve through the throttle body intake port and let it soak for about 5 minutes. After 5 minutes open thevalve and wipe it clean with a soft rag.
Keep the throttle valve closed while spraying to avoid charging the intake path with solvent.
Start the engine, race it several times and allow the engine to run near idle for 1 minute.
Repeat Steps 4 and 5.
Unplug the bypass passage inlet.
Attach the intake air hose.
Disconnect the battery ground cable for more than 10 seconds.
Connect a HI-SCAN to the data link connector.
Before inspecting the TPS, complete the basic idle speed adjustment.
If a HI-SCAN is not used, connect a digital type voltmeter between ground and TPS output terminal.
Standard value : 300 ~ 900 mV (2.4 I4) 250 ~ 800 mV (2.7 V6) |
Standard value : 3.5 ~ 6.5 KΩ (2.4 I4) 1.6 ~ 2.4 KΩ (2.7 V6) |
If it is out of specification, replace TPS with new one.
Tighten the screws securely after replacement.
Turn the ignition switch to the OFF position.
The fuel pump is an in-tank type and its operating sound is hard to hear without removing the fuel tank cap.
Pinch the hose to check that fuel pressure is felt.
Disconnect the vacuum hose from the throttle body EVAP Canister purge hose fitting and connect a vacuum pump.
If there is no vacuum, it is possible that the throttle body port may be restricted and may require cleaning.
Reduce the internal pressure of the fuel lines and hoses:
Disconnect the fuel pump harness connector
Start the engine and after it stalls, turn the ignition switch to the OFF position
Disconnect the battery negative (-) terminal
Connect the fuel pump harness connector
Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.
Using the fuel pressure gauge adapter, install the fuel pressure gauge to the fuel pressure gauge adaptor. Tighten the bolt to the specifiedtorque.
Fuel pressure gauge to fuel delivery pipe 25~35 Nm (250~350 kg·cm, 18~26 lb·ft) |
Connect the battery's negative (-) terminal.
Apply battery voltage to the terminal for the pump drive and activate the fuel pump. With fuel pressure applied, check that there is no fuel leakagefrom the pressure gauge or connection part.
Start and run the engine at curb idle speed.
Disconnect the vacuum hose from the pressure regulator, and plug the hose end. Measure the fuel pressure at idle.
Standard value : 320~340 kPa (3.26~3.47 kg/cm², 46~49 psi) |
Standard value : Approx.255 kPa (2.57 kg/cm², 37 psi) |
If the results of the measurements made in steps (7) and (8) are not within the standard value, use the table below to determine the probablecause, and make the necessary repairs.
Condition | Probable cause | Remedy |
Fuel pressure is too low | ● Clogged fuel filter ● Fuel leakage to the return side, caused by poor seating of the fuel-pressure regulator | ● Replace fuel filter ● Replace fuel pressure regulator |
● Low discharge pressure of the fuel pump | ● Check the in-tank fuel hose for lage or replace the fuel pump | |
Fuel pressure is too high | ● Sticking fuel pressure regulator ● Clogged or bent fuel return hose or pipe | ● Replace fuel pressure regulator ● Repair or replace hose or pipe |
There is no difference in fuel pressure when the vacuum hose is connected and when it is not. | ● Clogged, or damaged vacuum hose or nipple ● Sticking or poor seating of the fuel pressure regulator | ● Repair or replace the vacuum hose or the nipple ● Repair or replace hose or pipe |
Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indication drops, observe the rate at which it drops. Determine and remove the causesaccording to the following table.
Condition | Probable cause | Remedy |
Fuel pressure drops slowly after engine is stopped | ● Injector leakage | ● Replace injector |
Fuel pressure drops immediately after engine is stopped | ● The check valve within the fuel pump is open | ● Replace fuel pump |
Reduce the pressure in the fuel line.
Cover the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure in the fuelline.
Replace the O-ring at the end of the hose.
Connect the fuel hose to the delivery pipe and tighten to the specified torque.
Check for fuel leakage.
