Trouble Of Start-Up Anytime Despite Rpm Normal - PGO Tigra AF-125BAE Service Manual

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