2009 CHERY TIGGO ignition

Downloaded from www.Manualslib.com manuals search engine Engine Control Module (ECM)
Description
The Engine Control Module (ECM) for this model is serviced only as a complete unit.
Operation
The ECM is a pre-programmed, microprocessor-based digital computer. It regulates ignition timing, air-fuel ratio,
emission control devices, charging system, certain transmission features, speed control, air conditioning compressor
clutch engagement and idle speed. The ECM can adapt its programming to meet changing operating conditions.
Removal & Installation
1. Disconnect the negative battery cable.
2. Remove the glove box (See Instrument Panel Removal & Installation in Section 15 Body & Accessories).
3. Disconnect the ECM connector.
4. Remove the ECM retaining bolts (1).(Tighten: ECM retaining bolts to 10 N·m)
5. Remove the ECM.
6. Installation is in the reverse order of removal.
ON-VEHICLE SERVICE
LTSM030025
03
03–539Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Symptom Diagnostic Tests
General Troubleshooting Checks
•Confirm the engine trouble light is working properly.
• Confirm that there are no DTCs recorded with the X-431 Scan Tool.
• Confirm that the customer’s complaint is current, and the conditions that are causing the failure are present.
Visual Inspection
•Check the fuel system for any fuel leakage.
• Check the vacuum system for any broken, kinked or incorrectly linked vacuum pipes or hoses.
• Check the intake air pipe for being jammed, leaking, or damaged.
• Check the ignition system for any broken or aging spark plug wires and verify the engine firing order is correct.
• Check the engine ground cable and verify a clean and tight connection.
• Check the sensors and actuators electrical connectors and verify good contact and tight connection.
NOTE :
Repair any of the above conditions first before continuing with symptom diagnostics.
Diagnostic Help
• Confirm there are no current engine DTCs.
• Confirm that the failure exists and the customer complaint can be verified.
• Inspect the engine following the above steps and verify all engine features are operating properly.
• While servicing the vehicle, verify the service record, vehicle maintenance, engine compression pressures,
mechanical ignition timing and fuel conditions.
• If replacing the Engine Control Module (ECM), carry out the validation test. If the failure no longer exists, the
failure is in the ECM; if the failure still exists, reinstall the original ECM and repeat the diagnostic test.
Symptom Diagnostic Test List
SYMPTOM DEFINITION
Engine Cranks Normal But Will Not Start
Engine Will Not Crank
Hard Start / Long Crank Time
Fast Idle
Lack / Loss Of Power
Back Fires
Engine Poor Driveability
Low Idle / Stalls During Deceleration
Idle Speed Slow Return To Normal Idle
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03–544Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Engine Cranks Normal But Will Not Start
The following conditions apply to this symptom:
•The engine cranks at normal speed.
• The engine will not start.
• The battery is fully charged.
1.PRELIMINARY CHECKS
CAUTION:
Extended cranking because of a No Start can load the exhaust system with raw fuel, damaging the
catalytic converter after the engine starts.
•Carry out the following preliminary checks:
Fuel quality
Electrical connections
Intake air tube integrity
Fuses and relays
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair as necessary.
Verify the symptom no longer exists.
2.CHECK DTC
• Turn the ignition switch on.
• With the scan tool X-431, select view DTC.
Are there any DTCs present?
Ye s>>See the Diagnostic Trouble Code (DTC) List.
Go to the specific diagnostic test to troubleshoot the DTC.
No
>>Go to the next step.
3.TRY TO START THE ENGINE WITH THE THROTTLE CLOSED
• Attempt to start the engine.
Does the engine start now with the throttle closed?
Ye s>>Verify the symptom no longer exists.
No
>>Go to the next step.
4.CHECK EXHAUST SYSTEM
• Inspect the vehicles exhaust system for restriction.
Is there a restriction in the exhaust system?
Ye s>>Repair as necessary.
No
>>Go to the next step.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
03–545Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Engine Will Not Crank
The following conditions apply to this symptom:
•The engine will not crank.
1.PRELIMINARY CHECKS
• Carry out the following preliminary vehicle inspection:
Fuel quality
Battery connections
Starter relay connections
Manual transmission clutch fully depressed
Engine immobilizer activated
Fuses/Fuse links
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair as necessary.
Verify the symptom no longer exists.
•
2.LISTEN FOR STARTER RELAY CLICKING
• Attempt to start the engine.
Is a clicking sound heard from the starter relay when the ignition key is turned to START?
Ye s>>Go to the next step.
No
>>Go to step 5.
3.CHECK STARTING SYSTEM
• Check the starter, starter ground, starter relay cable to starter and battery.
Is a fault indicated?
Ye s>>Repair as necessary.
No
>>Go to the next step.
4.CHECK OPERATION OF OTHER ELECTRICAL ACCESSORIES
• Check all accessories.
Do any other electrical accessories work?
Ye s>>Go to the next step.
No
>>Check the charging system.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
03–547Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 5.CHECK DTC
• Turn the ignition switch on.
• With the scan tool X-431, read the DTC.
Are there any DTCs present?
Ye s>>Check for cause.
No
>>Go to the next step.
6.CHECK STARTING SYSTEM PRIMARY CIRCUITS
• Check the starting system primary circuits as follows:
Starter relay
Ignition switch
Are components/systems OK?
Ye s>>Ensure customer’s concern has been resolved.
No
>>Repair as necessary.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03–548Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Hard Start / Long Crank / Erratic Start / Erratic Crank
The following conditions apply to this symptom:
•The engine cranks for an extended period of time.
• The engine starts hard during a long cranking time.
1.PRELIMINARY CHECKS
• Confirm that the correct starting procedure was used by the customer before proceeding with diagnosis.
• Carry out the following preliminary checks:
Vacuum leaks
Fuel quality (concerns such as correct octane, contamination, winter/summer blend)
Intake air system (tubes)
Air cleaner (restrictions)
Battery condition and starter current draw.
Are all checks OK?
Ye s>>Go to the next step.
No
>>Repair as necessary.
Verify the symptom no longer exists.
2.CHECK ECM DTC
• With scan tool X-431, select view DTC and data stream in ECM.
Are there any DTCs present?
Ye s>>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?
Ye s>>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
Faulty spark plug wires
Faulty spark plugs
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03
03–549Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Fast Idle
The following conditions apply to this symptom:
•The engine idles at a higher than recommended speed.
1.VERIFY ENGINE OPERATES AT NORMAL OPERATING TEMPERATURE
• Check the engine operating temperature.
Does the engine appear to be either overheating or not reaching normal operating temperature?
Ye s>>Repair the engine cooling system.
No
>>Go to the next step.
2.PRELIMINARY CHECKS
• Carry out the following preliminary checks:
Vacuum leaks
Throttle plate and linkage
Intake air tube (leaks)
Correct sealing of intake manifold and components attached to intake air tube
Are all checks OK?
Ye s>>Go to the next step.
No
>>Repair as necessary.
Verify the symptom no longer exists.
3.CHECK ECM DTC
• Turn the ignition switch on.
• With the scan tool X-431, select view DTC and data stream in ECM.
Are there any DTCs present?
Ye s>>See the Diagnostic Trouble Code (DTC) List.
Go to the specific diagnostic test to troubleshoot the DTC.
No
>>See Diagnostic Help for additional information.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03–552Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 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?
Ye s>>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?
Ye s>>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?
Ye s>>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
03–553Chery Automobile Co., Ltd.