Service manual

Information Summary and Preparation 1
15
(5) Trouble of start-up anytime despite RPM normal
General trouble location: 1. Water in fuel; 2. Fuel pump; 3. Engine temperature sensor; 4. Nozzle; 5.
Ignition coils; 6. Air throttle and & idle air bypass; 7. Air intake; 8. Ignition timing; 9. Spark plug; 10.
Engine mechanism.
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent Steps
1 Check any jam of the air filter and leakage of the air intake.
Yes
Repair the air intake
system.
No Next step
2
Connect a fuel pressure gauge before the fuel inlet of the
nozzle; start the engine to check the fuel pressure at 300kPa or
so.
Yes Next step
No
Repair the fuel supply
system.
3
Disconnect the ignition cable and connect a spark tester; start
the engine and check any high-voltage flash (blue/white).
Yes Next step
No
Repair the ignition
system.
4
Check the spark plug in the cylinder and its model and gap
conformable to specifications.
Yes Next step
No
Adjust or change the
spark plug.
5
Press the engine temperature sensor connector and start the
engine; check if the engine is successfully started.
Yes
Correct circuits or
replace the sensor.
No Next step
6 Slightly pull the throttle to check if the engine is easily started.
Yes
Clean the air throttle
and the air intake for
idle speed.
No Next step
7
Disassemble the nozzle and check any leakage or jam in the
nozzle with a nozzle cleaner & analyzer.
Yes
Change the defective
nozzle.
No Next step
8
Check fuel and observe any trouble attributed to fuel just
added.
Yes Change fuel.
No Next step
9
Check pressure of the engine cylinder and find any possibility
of pressure insufficient.
Yes
Eliminate any
mechanical trouble of
the engine.
No Next step
10
Check if mechanical ignition timing of the engine is
conformable to specifications.
Yes Next step
No
Correct ignition
timing.
11
Connect an EMS adapter and press the power switch to check
voltages at Pins 5#, 10#, and 23#; check grounding at Pins 2#
and 21#.
Yes Diagnosis assist
No
Repair the relevant
circuits.