Start-Up Normal But Idle Speed Too High - PGO Tigra AF-125BAE Service Manual

(10) Start-up normal but idle speed too high

General trouble location: 1. Air throttle and idle air bypass; 2. Vacuum tube; 3, Idle governor; 4. Engine
temperature sensor; 5. Ignition timing.
Procedure for general diagnoses:
No.
1 Check the throttle cable for jammed or too tight.
Check the air intake system and the connected vacuum tube
2
for any leakage.
Remove the idle governor to check the air throttle, the idle
3
governor and the idle air bypass for any carbon deposition.
Press the engine temperature sensor connector and start the
4
engine; check if the engine's the idle speed is too high.
Check if mechanical ignition timing of the engine is
5
conformable to specifications.
Connect an EMS adapter and press the power switch to check
6 voltages at Pins 5#, 10#, and 23#; check grounding at Pins 2#
and 21#.
Information Summary and Preparation 1
Operating Procedure
20
Detection
Subsequent Steps
Results
Yes Adjustment
No Next step
Repair the air intake
Yes
system.
No Next step
Yes Clean relevant parts.
No Next step
Correct circuits or
Yes
replace any sensor.
No Next step
Yes Next step
Correct ignition
No
timing.
Yes Diagnosis assist
Repair the relevant
No
circuits.