Low Idle / Stalls During Deceleration
The following conditions apply to this symptom:
• Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
1.
PRELIMINARY CHECKS
• Carry out the following preliminary checks:
− Vacuum lines (routing, leaks)
− Intake air tubes
− Wiring connections
Are all checks OK?
Yes
>> Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
2.
CHECK FOR ROUGH OR STALL AT IDLE
• Check for rough idle or stall at 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 and combustion chamber
Does the engine idle rough?
Yes
>> Repair as necessary.
No
>> Go to the next step.
3.
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.
4.
CHECK THE ELECTRONIC THROTTLE CONTROL (ETC) ACTUATOR
• Start engine and let idle.
• Disconnect the ETC actuator connector and check for RPM drop or engine stall.
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
03–197
Chery Automobile Co., Ltd.
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