Table 1-71 (Continued)
S/N Operation Test Results Actions
Yes Next step
10
Check if the ignition sequence and timing of the
engine can meet with the standards.
No
Check and repair ignition
timing
Yes Diagnosis help
11
Connect the electronic injection system adapter.
Turn on the ignition switch. Check the power supply
of the pin 12#, 13#, 44#, 45#, 63#. Check the
grounding of the pin 3#, 51#, 53#, 61#, 80#. Are
they OK?
No
Check and repair relevant
line
6. With normal start, unstable idle speed at any time
Common trouble location:
1. Fuel with water; 2. Fuel injector; 3. Spark plug;
4. Throttle body and idle speed by-pass air way; 5. Intake air way;
6. Idle speed regulator; 7. Ignition timing;
8. Spark plug; 9. Mechanical part of engine.
Diagnosis Flow
Table 1-72
S/N Operation Test Results Actions
Yes
Check and repair air
intake system
1
Check the air filter for blockage and the intake air
way for leakage.
No Next step
Yes Wash and replace
2 Check if the idle speed regulator is blocked.
No Next step
Yes Next step
3
Check the spark plug for each cylinder. Check if its
model and gap can meet with starndards.
No Adjust or replace
Yes Wash
4
Check the throttle body and idle speed by-pass air
way for carbon deposition.
No Next step
Yes Remove the trouble
5
Remove the fuel injector. Check the fuel injector for
leakage, blockage or abnormal flow with a special
fuel injector cleaner & analyzer.
No Next step
Yes Replace fuel
6 Check the fuel for normal operation.
No Next step
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