Engine Electrical System

4) Difficult start-up under normal engine speed
Item
No.
Operation procedure
Inspection
results
Follow-up procedure
Yes
Fix the indicated
malfunction
1
Turn the ignition switch to “ON”
position. Inspect with the diagnostic
tester to see whether there is any
malfunction information record.
No Proceed to next step.
Yes Proceed to next step.
2
Verify that the air filter is free of any
blockage.
No Replace
Yes Proceed to next step.
3
After start up, verify that the air intake
manifold pressure is maintained between
35-65 kPa at idle speed.
No
Fix the leakage of air
intake system
4
Step on the throttle gently and observe
whether it’s easy to start up.
Yes
Replace and inspect the
throttle valve and idle
speed passage
Yes Proceed to next step.
5
Connect the fuel manometer valve. Short
the 30# and 87# pins of the fuel pump
relay to operate the fuel pump in order to
verify that the fuel pressure is
maintained at about 350kPa.
No Proceed to Step 9
Yes Proceed to Step 8
6
Apply a voltage supply of 12V directly
between the battery and the fuel injector
with special connector, and verify that
the fuel injector functions normally.
No Proceed to next step.
Yes Proceed to next step.
7
After washing and cleaning the fuel
injector, verify that its function is
normal.
No
Replace the fuel
injector
Yes Replace the fuel
8
Replace the fuel and verify that the fuel
is deteriorated or contaminated by water.
No Proceed to Step 14
Yes Proceed to next step.
9
Verify that the fuel pressure is lower
than 350kPa.
No Proceed to Step 13
Yes Proceed to next step.
10
Close the fuel manometer valve.
Connect 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 12.
Yes
Replace fuel pressure
regulator
11
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 the fuel
pipe
12
Verify that the fuel inlet pipe has any
leakage or blockage.
Yes
Repair or replace the
fuel air inlet pipe
E-68
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