GDI -
On-vehicle Service
13I-125
12. Check to see that fuel pressure at idle does not drop even
after the engine has been raced several times.
13. If fuel pressure is out of the standard value, troubleshoot
and repair according to the table below.
Symptom Probable cause Remedy
D
Fuel pressure too low
D
Fuel pressure drops after racing
Fuel leaking to return side due to poor
fuel pressure regulator valve seating
or settled spring in the fuel pump
(high pressure).
Replace fuel pump (high pressure)
Low fuel pump (high pressure)
delivery pressure
Replace the fuel pump
(high pressure)
Fuel pressure too high Clogged fuel pressure regulator valve
in the fuel pump (high pressure)
Replace fuel pump (high pressure)
Clogged fuel return hose or pipe Clean or replace hose or pipe
14. Stop the engine and turn the ignition switch to OFF.
15. Disconnect the MUT-
II
.
FUEL LEAK CHECK
1. Connect the MUT-
II
to the diagnosis connector.
2. Disconnect the injector intermediate harness connector.
3. Turn the ignition switch to ON.
4. Select “Item No. 74” from the MUT-
II
Data list.
5. Crank the engine continuously for two seconds or more,
and visually check that there are no fuel leaks from any
parts.
Caution
If any fuel leaks appear, stop cranking immediately
and repair the source of the leak.
6. Crank the engine, and then measure fuel pressure
immediately after 20 seconds.
Limit: Minimum 1 MPa
Caution
If the fuel pressure is less than 1 MPa, there may
be a partial fuel leak in the high-pressure fuel system.
7. Turn off the ignition switch.
8. Reconnect the injector intermediate connector.
9. Remove the MUT-
II
.
Injector intermediate harness
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