Information Summary and Preparation
-1
(12) Acceleration slow
General trouble location: 1. Water in fuel; 2. Inlet pressure sensor and air throttle sensor; 3. Spark
plug; 4. Air throttle and idle air bypass; 5. Air intake; 6. ISC ; 7. Nozzle; 8. Ignition timing; 9.
Exhauster.
Procedure for general diagnoses:
No. Operating
Procedure Detection
Results
Subsequent
Steps
1
Check the air filter for any jam.
Yes
Check 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 during the idle status.
Yes Next
step
No
Repair the fuel
supply system.
3
Check the spark plug in the cylinder and its model and gap
conformable to specifications.
Yes Next
step
No
Adjustment or
replacement
4
Remove the ISC and check the air throttle, the ISCand the
idle air bypass for any carbon deposition.
Yes
Clean relevant
parts.
No Next
step
5
Check the inlet pressure sensor, the air throttle sensor and
circuits.
Yes Next
step
No
Correct circuits or
replace any
sensor.
6
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
7
Check fuel and observe any trouble attributed to fuel just
added.
Yes Change
fuel.
No Next
step
8
Check if the engine’s ignition timing is conformable to
specifications.
Yes Next
step
No
Correct ignition
timing.
9
Check the exhauster for exhaust normally discharged.
Yes Next
step
No
Repair or replace
the exhauster.
10
Check the ECU circuit
20
