Service manual

Information Summary and Preparation 1
23
(13) Acceleration powerless; performance bad
General trouble location: 1. Water in fuel; 2. Inlet pressure sensor and air throttle sensor; 3. Spark plug; 4.
Ignition coils; 5. Air throttle and idle air bypass; 6. Air intake; 7. Idle governor; 8. Nozzle; 9. Ignition
timing; 10. Exhauster.
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent
Ste
p
s
1
Check any troubles such as clutch slip, low tire pressure, brake drag,
wrong tire size.
Yes Reparation
No Next step
2 Check the air filter for any jam.
Yes
Repair the air
intake system.
No Next step
3
Connect a fuel pressure gauge before the fuel inlet of the nozzle; start the
engine to check the fuel pressure at 300kPa or so during the idle status.
Yes Next step
No
Repair the fuel
supply system.
4
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.
5
Check the spark plug in the cylinder and its model and gap conformable
to specifications.
Yes Next step
No
Adjustment or
replacement
6
Remove the idle governor to check the air throttle, the idle governor and
the idle air bypass for any carbon deposition.
Yes
Clean relevant
parts.
No Next step
7 Check the inlet pressure sensor, the air throttle sensor and circuits.
Yes Next step
No
Correct circuits or
replace any sensor.
8
Disassemble the nozzle and check any leakage or jam in the nozzle with
a nozzle cleaner & analyzer.
Yes
Replace the
defective nozzle.
No Next step
9 Check fuel and observe any trouble attributed to fuel just added.
Yes Change fuel.
No Next step
10 Check if the engine’s ignition timing is conformable to specifications.
Yes Next step
No
Correct ignition
timing.
11 Check the exhauster for exhaust normally discharged.
Yes Next step
No
Repair or replace
the exhauster.
12
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.