2.
Has any problems been found?
 | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "Fuel System Inspection" procedure. |
Refer to "Shop Manual" and viasullay and/or physically inspect following conditions;
- Proper installation of O2 Sensors.
- Check for corrosion on terminals.
- Check for damaged wiring.
- Fuel, Engine coolant or oil contamination.
- Check for good ground for O2 sensor.
Has any problems been found?
| ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "Fuel System Inspection" procedure. |
Refer to "Shop Manual" and release the residual pressure in fuel line.
When removing the fuel pump relay, A Diagnostic Trouble Code(DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.
Install the Special Service Tool(SST).
Disconnect the fuel feed tube from the high pressure fuel pump.
There may be some residual pressure even after "Release Residual Pressure in Fuel Line" work. Therefore, cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.
Install the Special service tool for measuring the fuel pressure in btween the fuel feed tube and the high pressure fuel pump(Refer to figure below).
Inspect fuel leakage on connections among the fuel feed tube, the high pressure fuel pump, and the SST components with Ignition "ON".
Measure Fuel Pressure.
Start the engine and measure the fuel pressure at idle.
Specification : Fuel Pressure - 445 ~ 455 kPa(4.5 ~4.6kgf/cm2 / 64.5~ 66.0 psi)
If the fuel pressure differs from the standard value, repair or replace the related parts(refer to the table below).
Fuel Pressure | Casue | Related Parts |
Too Low | Fuel Filter Clogged | Fuel Filter |
Fuel Leakage | Fuel Pressure Regulator | |
Too High | Fuel Pressure Regulator Stuck | Fuel Pressure Regulator |
Stop the engine, and then check for the change in the fuel pressure gauge reading.
Standard Value : The gauge reading should hold for about 5 minutes after the engine stops
If the gauge reading is not held, repair or replace the related parts(refer to table below).
Fuel Pressure (After Engine Stops) | Casue | Related Parts |
Fuel Pressure Drops Slowly | Leakage on injectors | Injectors |
Fuel Pressure Drops Immediately | Check valve of fuel pump stuck open | Fuel Pump |
Ignition "OFF"
Is fuel pressure value within specification?
| ▶ Go to "Wiring Inspection" procedure. |
| ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
