Lack / Loss Of Power
The following conditions apply to this symptom:
• The engine has poor performance.
• The engine has poor acceleration.
1.
PRELIMINARY CHECKS
• Verify symptom is reported under normal driving conditions without excessive engine/vehicle load conditions.
• Carry out the following preliminary checks:
− Fuel quality
− Vacuum lines (check for damage and correct routing)
− Intake air system (check for damaged tubes and dirty air filter)
− Vehicle wiring (disconnected, corroded/damaged)
− Throttle linkage
− Radiator (obstructed)
− Transaxle
NOTE :
Be aware of the over RPM limiting functions of the ECM.
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 ignition switch on.
• With the X-431 scan tool, read the DTC.
Are there any DTCs present?
Yes
>> Check for causes. See Diagnostic Trouble Code (DTC) index — Engine Control Module (ECM).
No
>> Go to the next step.
3.
CHECK FUEL SYSTEM PRESSURE
• Release the fuel system pressure (See Fuel Pressure Relief Procedure in Section 04 Fuel Delivery).
• Check fuel system pressure (See Fuel Pressure Test in Section 04 Fuel Delivery).
Is fuel pressure correct?
Yes
>> Go to the next step.
No
>>
If the fuel pressure is greater than 400 kPa (4 bar):
− Replace the fuel pressure regulator.
If the fuel pressure is less than 400 kPa (4 bar):
− Check fuel supply system for restriction or leak.
− If no problems are found, repair or replace fuel filter, pressure regulator or fuel pump assembly.
ELECTRONIC ENGINE CONTROLS - ENGINE SYMPTOM DIAGNOSIS
03–188
Chery Automobile Co., Ltd.
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