GDI ± On-vehicle Service
13A-98
9. Start the engine and run at idle.
10. Measure fuel pressure while the engine is running at idle.
Standard value: approximately 4 ± 6.9 MPa
11. Check to see that fuel pressure at idle does not drop
even after the engine has been raced several times.
12. 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 (high pres-
sure) valve seating or settled spring
Replace fuel pressure regulator
(high pressure)
Low fuel pump (high pressure)
delivery pressure
Replace the fuel pump
(high pressure)
Fuel pressure too high
Binding valve in fuel pressure regula-
tor (high pressure)
Replace fuel pressure regulator
(high pressure)
Clogged fuel return hose or pipe Clean or replace hose or pipe
13. Stop the engine and turn the ignition switch to OFF.
14. Disconnect the MUT-II.
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