Hard Start / Long Crank / Erratic Start / Erratic Crank
The following conditions apply to this symptom:
• The engine cranks for an extended period of time.
• The engine starts hard during a long cranking time.
1.
PRELIMINARY CHECKS
• Confirm that the correct starting procedure was used by the customer before proceeding with diagnosis.
• Carry out the following preliminary checks:
− Vacuum leaks
− Fuel quality (concerns such as correct octane, contamination, winter/summer blend)
− Intake air system (tubes)
− Air cleaner (restrictions)
− Battery condition and starter current draw.
Are all checks OK?
Yes
>> Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
2.
CHECK ECM DTC
• With the X-431 scan tool, select view DTC and data stream in ECM.
Are there any DTCs present?
Yes
>> Check for cause of DTC (See Diagnostic Trouble Code (DTC) List in Section 03 Electronic Engine
Controls).
No
>> Go to the next step.
3.
CHECK SECONDARY IGNITION SYSTEM
• Perform the following to test the secondary ignition system:
− Disconnect the injector fuse.
− Remove any of the 4 spark plugs.
− Connect the spark plug to spark plug wire.
− Ground the spark plug on the cylinder block.
− Crank the engine to test the secondary ignition system with the spark plugs removed.
Is a strong blue spark visible at each spark plug while cranking the engine?
Yes
>> Go to the next step.
No
>>
Check Camshaft Position (CMP) sensor signal at ECM.
If CMP sensor is OK, check the following:
− Crankshaft Position (CKP) sensor malfunction
− Faulty spark plug wires
− Faulty spark plugs
ELECTRONIC ENGINE CONTROLS - ENGINE SYMPTOM DIAGNOSIS
03–184
Chery Automobile Co., Ltd.
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