Idle Speed Slow Return To Normal Idle
The following conditions apply to this symptom:
• Slow return to idle.
1.
PRELIMINARY CHECKS
• Carry out the following preliminary checks:
− Vacuum leaks
− Intake air system
− Throttle body
Are all checks OK?
Yes
>> Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
2.
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.
3.
CHECK PCV VALVE
• Remove Positive Crankcase Ventilation (PCV) valve and shake it.
Does PCV valve rattle?
Yes
>> Install PCV valve, go to the next step.
No
>> Replace the PCV valve.
4.
CHECK PCV SYSTEM
• Start engine and bring to normal operating temperature.
• Disconnect the crankcase ventilation hose from PCV valve.
• Place a stiff piece of paper over the hose.
• Wait 1 minute.
Does vacuum hold paper in place?
Yes
>> Verify test results. If OK, see Symptom Diagnostic Tests list to repair any additional symptoms.
No
>> Check for vacuum leaks, obstructions in the PCV system, oil cap, PCV valve, rocker cover bolt
torque/gasket leak. Repair as necessary.
ELECTRONIC ENGINE CONTROLS - ENGINE SYMPTOM DIAGNOSIS
03
03–199
Chery Automobile Co., Ltd.
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