Engine Electrical System

the ignition switch again to re-operate the
fuel pump in order to verify that the fuel
pressure can be established.
No Proceed to Step 16.
Yes
Replace the fuel pressure
regulator
15
Open the fuel manometer valve and
clamp the fuel return pipe with the fuel
tube clamp to stop the fuel return in order
to verify that the fuel pressure can be
established quickly.
No
Repair or replace the fuel
injector or fuel pipe
Yes
Repair or replace the fuel
air inlet pipe 16
Verify that the fuel inlet pipe has any
leakage or blockage.
No Replace the fuel pump
Yes
Repair or replace the fuel
return pipe
17
Verify that the fuel return pipe has any
leakage or bending.
No
Replace the fuel pressure
regulator
Yes Clean
18
Verify that the sensing holes of the
pressure and temperature sensor of air
intake manifold have any blockages.
No Proceed to next step.
Yes Proceed to next step.
19
Run the engine at idle speed. When the
coolant temperature reaches the
temperature of activating the close- loop
control, verify that oxygen sensor
functions normally. (Fluctuating within
the range of 0-1V)
No
Inspect the oxygen
sensor and the wiring
harness
Yes Fix the leakage
20
Verify that the engine air intake system
has any leakage.
No Proceed to next step.
Yes Proceed to next step.
21
Verify that the pressure of engine
cylinder is normal.
No Fix the malfunction
Yes Replace the ECU.
22
Run the engine at idle speed until the
coolant temperature reaches its normal
range in order to verify that the ignition
advance angle is normal.
No Inspect other items
E-73
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