Chery Tiggo. Manual — part 211
5.
CHECK KNOCK SENSOR
• Check knock sensor.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
6.
CHECK TIMING
• Check for the timing misalignment.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Align the engine timing belt (See Engine Timing Belt Removal & Installation in Section 02 Engine).
7.
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.
8.
CHECK FOR BASE ENGINE CONCERNS
• Check for base engine concerns (such as improper cylinder compression, worn camshaft/valve train, gasket
leaks).
Is a fault indicated?
Yes
>>
Repair as necessary.
No
>>
See Diagnostic Help for additional information.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
Engine Poor Driveability
The following conditions apply to this symptom:
• Engine stalls/quits, engine runs rough, misses, buck/jerk, hesitation/stumble acceleration, surges, rolling idle.
• Engine stops unexpectedly at beginning of acceleration or during acceleration.
• Engine stops unexpectedly while cruising.
• Engine speed fluctuates during acceleration.
• Engine misses during acceleration.
• Vehicle bucks/jerks during acceleration, cruising or deceleration.
• Momentary pause during acceleration.
• Momentary minor loss in engine output.
1.
PRELIMINARY CHECKS
NOTE :
Be aware of the over RPM limiting functions of the ECM.
• 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
Are all checks OK?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
2.
CHECK FOR STALL AT IDLE
• Check for engine stall at idle.
NOTE :
Confirm that proper vehicle maintenance has been performed before continuing with engine diagnosis.
• Inspect the following components:
− Clean the injectors
− Fuel filter
− Intake air filter
− Throttle body
− Spark plugs
− Spark plug wires
Does the engine now stall at idle?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
3.
CHECK FOR ROUGH IDLE
• Check for engine rough 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
− Throttle body
− Spark plugs and combustion chamber
Does the engine idle rough?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
4.
CHECK ECM DTC
• Turn the ignition switch on.
• With the scan tool X-431, read the DTC.
Are there any DTCs present?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
5.
CHECK THE ELECTRONIC THROTTLE CONTROL (ETC) ACTUATOR
• Start engine and let idle.
• While checking for RPM drop or engine stall, disconnect ETC actuator connector.
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 - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
6.
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
7.
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.
8.
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.
9.
CHECK PCV SYSTEM
• Check the Positive Crankcase Ventilation (PCV) system.
• Remove PCV valve and shake it.
Is PCV valve normal?
Yes
>>
Go to the next step.
No
>>
Replace the PCV valve.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст