3.
CHECK FOR ROUGH IDLE
• Check for engine rough idle.
NOTE :
Confirm that proper vehicle maintenance has been performed before continuing with engine diagnosis.
• Inspect the following components:
− Clean the carbon deposit on intake and exhaust valves
− Valve stem
− Spark plugs
− Throttle body
− Spark plugs and combustion chamber
Does the engine idle rough?
Yes
>> Repair as necessary.
No
>> Go to the next step.
4.
CHECK ECM DTC
• Turn the ignition switch on.
• With the X-431 scan tool, read the DTC.
Are there any DTCs present?
Yes
>> Repair as necessary.
No
>> Go to the next step.
5.
CHECK THE ELECTRONIC THROTTLE CONTROL (ETC) ACTUATOR
• Start engine and let idle.
• While checking for RPM drop or engine stall, disconnect ETC actuator connector.
Did RPM drop or engine stall when the ETC connector was disconnected?
Yes
>>
Connect ETC actuator connector.
Go to the next step.
No
>> Repair as necessary.
ELECTRONIC ENGINE CONTROLS - ENGINE SYMPTOM DIAGNOSIS
03–194
Chery Automobile Co., Ltd.
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