5. Fuel Injection System
5-14
Throttle Body & By-pass Valve Clean Procedure
● It’s suggested that clean the air by-pass valve before cleaning the throttle body.
● Recommended cleaning frequency: every 6000 km.
Clean procedure:
1. Air by-pass valve：
1. Switch off; disconnect the air tube between the air by-pass valve and connecting pipe.
2. Turn on the engine and keep the idle speed.
3. Spray a little carburetor cleaner into the air by-pass vale for 3~5 minutes. Do not shut
down the engine during cleaning.
4. Connect the air tube.
2. Throttle body:
1. Switch off; remove the throttle body.
2. Spray a little carburetor cleaner into the throttle body.
3. Wipe off the dirty oil with clean cloth or tissue.
4. Dry the throttle body with compressed air and install the throttle body. Connect the
diagnostic tool and switch on.
Idle speed learning:
After performing air by-pass valve or throttle body cleaning, idle speed learning should be carried
out to let ECU know the engine condition well.
When performing the idle speed learning, run the engine at idle speed over 10 minutes after the
engine temperature reaches the working temperature (around 70℃~95℃), and then ECU will get
the parameters from sensors.
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