Chery Tiggo. Manual — part 210
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 scan tool X-431, read the DTC.
Do any DTC displayed on the scan tool?
Yes
>>
See the Diagnostic Trouble Code (DTC) List.
Go to the specific diagnostic test to troubleshoot the DTC.
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 (4.0 bar):
− Replace the fuel pressure regulator.
If the fuel pressure is less than 400 kPa (4.0 bar):
− Check the fuel supply system for restrictions or leaks.
− If no problems, repair or replace fuel filter, pressure regulator or fuel pump assembly.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
4.
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
− Spark plug wires
− Spark plugs
5.
CHECK INTAKE AIR SYSTEM
• Check for MAP/MAF sensor.
Is there any contamination?
Yes
>>
Clean or replace the sensor.
No
>>
Go to the next step.
6.
CHECK EXHAUST SYSTEM
• Check the exhaust system for restrictions.
Is there a restriction in the exhaust system?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
7.
CHECK BASE ENGINE CONCERNS
• Check for base engine concerns (such as improper compression, worn camshaft/valve train, gasket leaks).
Is a fault indicated?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
8.
CHECK AUTOMATIC/MANUAL TRANSAXLE OPERATION
• Check the operation of the transaxle.
Is the transaxle operation normal?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
9.
CHECK FOR BRAKE SYSTEM CONCERNS
• Check the operation of the brakes.
Is a fault indicated?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
10.
ADDITIONAL CHECKS
• Check the following for possible additional causes:
− Customer driving habits (such as excessive loads or over RPM limiting functions enabled).
− Clutch.
− Charging system.
− Ignition base timing (if not previously checked).
• If the base timing is not correct, align the engine timing belt (See Engine Timing Belt Removal & Installation in
02 Engine).
Are all checks OK?
Yes
>>
See Diagnostic Help for additional information.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
Back Fires
The following conditions apply to this symptom:
• The engine will back fire when operated.
• The engine back fire occurs at all operating parameters.
1.
PRELIMINARY CHECKS
• Carry out the following preliminary checks:
− Vacuum lines (check for damage and correct routing).
− Spark plug wire routing (correct firing order).
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 scan tool X-431, select view DTC and stream data in ECM.
Are there any DTCs present?
Yes
>>
See the Diagnostic Trouble Code (DTC) List.
Go to the specific diagnostic test to troubleshoot the DTC.
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
− Spark plug wires
− Spark plugs
4.
CHECK FUEL QUALITY
• Check fuel quality (concerns such as correct octane, contamination).
Is the fuel quality OK?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
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