Chery Tiggo. Manual — part 212
10.
CHECK EVAPORATIVE EMISSIONS (EVAP) SYSTEM
• Disconnect the canister control valve (1) hose.
• Place a stiff piece of paper over the hose end,
start engine.
Does vacuum hold the paper?
Yes
>>
Check for a vacuum leak in EVAP system
(refer to EVAP system) and refer to EVAP control cir-
cuit relative DTC.
No
>>
Go to the next step.
11.
CHECK ENGINE CYLINDER COMPRESSION
• Check engine cylinder compression.
• Compression should not be less than 1,000 kPa, and not vary more than 25 percent from cylinder to cylinder.
Is engine compression correct?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
12.
ADDITIONAL CHECKS
• Check the following for possible additional causes:
− Driveline
− Transaxle
− Charging system
− A/C system (for surge with A/C on)
Are the checks OK?
Yes
>>
See Diagnostic Help for additional information.
No
>>
Repair as necessary.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
VISMD030007
03
Low Idle / Stalls During Deceleration
The following conditions apply to this symptom:
• Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
1.
PRELIMINARY CHECKS
• Carry out the following preliminary checks:
− Vacuum lines (routing, leaks)
− Intake air tubes
− Wiring connections
Are all checks OK?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
Verify the symptom no longer exists.
2.
CHECK FOR ROUGH OR STALL AT IDLE
• Check for rough idle or stall at 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 and combustion chamber
Does the engine idle rough?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
3.
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.
4.
CHECK THE ELECTRONIC THROTTLE CONTROL (ETC) ACTUATOR
• Start engine and let idle.
• Disconnect ETC actuator connector and check for RPM drop or engine stall.
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
5.
CHECK CLUTCH OPERATION CONDITION
• Check clutch operation condition.
Is the transaxle clutch operation normal?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
6.
CHECK A/C SYSTEM OPERATION
• Start engine.
• Cycle A/C switch from on to off (verify A/C clutch engages condition).
• Check the A/C system operation.
Does the A/C system operate normally?
Yes
>>
Go to the next step.
No
>>
Repair as necessary.
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 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
Idle Speed Slow Return To Normal Idle
The following conditions apply to this symptom:
• Slow return to idle.
1.
PRELIMINARY CHECKS
• Carry out the following preliminary checks:
− Vacuum leaks
− Intake air system
− Throttle body
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, read the DTC.
Are there any DTCs present?
Yes
>>
Repair as necessary.
No
>>
Go to the next step.
3.
CHECK PCV VALVE
• Remove Positive Crankcase Ventilation (PCV) valve and shake it.
Does PCV valve rattle?
Yes
>>
Install PCV valve, go to the next step.
No
>>
Replace the PCV valve.
4.
CHECK PCV SYSTEM
• Start engine and bring to normal operating temperature. Disconnect crankcase ventilation hose from PCV valve.
Place a stiff piece of paper over the hose. Wait 1 minute.
Does vacuum hold paper in place?
Yes
>>
Verify test results. If OK, see diagnostic index to repair any additional symptom.
No
>>
Check for vacuum leaks, obstructions in the PCV system, oil cap, PCV valve, rocker cover bolt
torque/gasket leak. Repair as necessary.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
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