| 1. |
Release the residual pressure in fuel
line.
(Refer to Fuel Delivery System - “Release
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. | |
| 2. |
Install the Special Service Tool
(SST).
| (1) |
Disconnect the fuel feed tube from the
delivery pipe.
|
There may be some residual
pressure even after “Release Residual Pressure in Fuel
Line” work, so cover the hose connection with a shop
towel to prevent residual fuel from spilling out before
disconnecting any fuel
connection. | |
| (2) |
Install the special service tool for
measuring the fuel pressure in between the fuel feed tube and
the fuel delivery pipe (Refer to the figure
below).
| |
| 3. |
Inspect fuel leakage on connections among the
fuel feed tube, the delivery pipe, and the SST components with IG
ON. |
| 4. |
Measure Fuel Pressure.
| (1) |
Start the engine and measure the fuel
pressure at idle.
Fuel Pressure:
480 ~ 500 kPa (4.9 ~ 5.1 kgf/cm²,
69.6 ~ 72.5 psi)
|
|
If the fuel pressure differs from
the standard value, repair or replace the related part
(Refer to the table
below). |
Fuel
Pressure
|
Cause
|
Related
Part
|
Too Low
|
Fuel filter clogged
|
Fuel Filter
|
Fuel leakage
|
Fuel Pressure Regulator
|
Too High
|
Fuel pressure regulator valve
stuck
|
Fuel Pressure
Regulator
|
|
| (2) |
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 should not be
held, repair or replace the related part (Refer to the
table below). |
Fuel
Pressure
(After Engine Stops)
|
Cause
|
Related
Part
|
Fuel Pressure Drops Slowly
|
Leakage on injector
|
Injector
|
Fuel Pressure Drops Immediately
|
Check valve of fuel pump stuck open
|
Fuel
Pump
|
|
| (3) |
Turn the ignition switch
OFF. | |
| 5. |
Release the residual pressure in fuel
line.
(Refer to Fuel Delivery System - “Release
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. | |
| 6. |
Test End
| (1) |
Remove the Special Service Tool (SST)
from the fuel feed tube and the delivery
pipe. |
| (2) |
Connect the fuel feed tube and the
delivery
pipe. | |
| Release Residual Pressure in Fuel
Line |
|
Whenever the high pressure fuel pump, fuel
pipe, delivery pipe, or injector is removed immediately after
shutting off the engine, an injury may be caused by the release of
highly pressurized fuel. Release the residual pressure in the high
pressure fuel line by referring to the "Residual fuel pressure
release procedure" below before removing any high pressure fuel
system components.
|
|
Wear safety glasses and fuel resistant
gloves.
|
| 1. |
Turn the ignition off and disconnect the
battery negative cable. |
| 2. |
Remove the fuel pump fuse (A).
|
| 3. |
Disconnect the electrical connector from the
high pressure fuel pump. |
| 4. |
Reconnect the battery negative
cable. |
| 5. |
Run the engine for about 20 seconds to lower
the pressure in both the high or low pressurelines. The engine may
shut off within the 20 second period. If not, turn the engine
off. |
| 6. |
Proceed with the service or repair. Use rags
to cover opening and catch spills when opening up the high pressure
system. |
| 7. |
Reinstall / re-connect all components in
reverse order of removal. Start engine and confirm proper operation,
and make sure there are no fuel
leaks. |
| 8. |
After completing, clear DTC(s) using GDS scan
tool (the procedure described above will cause DTC to
set). | |
