Content .. 209 210 211 212 ..

Chery Tiggo. Manual - part 211

CHECK KNOCK SENSOR

• Check knock sensor.

Is the check result normal?

Yes

Go to the next step.

Repair as necessary.
Verify the symptom no longer exists.

CHECK TIMING

• Check for the timing misalignment.

Is the check result normal?

Yes

Go to the next step.

Align the engine timing belt (See Engine Timing Belt Removal & Installation in Section 02 Engine).

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.

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.

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.

See Diagnostic Help for additional information.

ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS

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.

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.

Repair as necessary.
Verify the symptom no longer exists.

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.

Go to the next step.

ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS

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.

Go to the next step.

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.

Go to the next step.

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.

Repair as necessary.

ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS

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.

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

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.

CHECK EXHAUST SYSTEM

• Check the exhaust system for restrictions.

Is there a restriction in the exhaust system?

Yes

Repair as necessary.

Go to the next step.

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.

Replace the PCV valve.

ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS

Content .. 209 210 211 212 ..