2009 CHERY TIGGO engine

Downloaded from www.Manualslib.com manuals search engine Idle Air Control (IAC) Motor
Description
The Idle Air Control (IAC) motor is mounted to the throttle body, and regulates the amount of air bypassing the con-
trol of the throttle valve. As engine loads and ambient temperatures change, engine RPM changes. A pintle on the
IAC motor protrudes into a passage in the throttle body, controlling air flow through the passage. The IAC motor is
control by the ECM to maintain the target engine idle speed.
Operation
At idle, engine speed can be increased by retracting the IAC motor pintle and allowing more air to pass through the
port, or it can be decreased by restricting the passage with the pintle and diminishing the amount of air bypassing the
throttle valve.
The IAC is called a stepper motor because it is moved in steps, or increments. Opening the IAC opens an air pas-
sage around the throttle valve with increases RPM.
Removal & Installation
1. Disconnect the negative battery cable.
2. Disconnect idle air control motor electrical connec-tor from the wiring harness connector.
3. Remove the idle air control motor retaining bolts (1).
(Tighten: Air control motor retaining bolt to 10 N·m)
4. Remove the idle air control motor.
5. Installation is in the reverse order of removal.
ON-VEHICLE SERVICE
LTSM030013
03
03–541Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Crankshaft Position (CKP) Sensor
Description
The Crankshaft Position (CKP) sensor is located on the flywheel shell facing the gear teeth of the signal plate. It
detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet and Induction coil.
Operation
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The
changing gap cause the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage
from the sensor changes. The Engine Control Module (ECM) receives the voltage signal and detects the fluctuation
of the engine revolution.
Removal & Installation
1. Disconnect the negative battery cable.
2. Disconnect the crankshaft position sensor electricalconnector from the crankshaft position sensor.
3. Remove the accessory drive belt (See Accessory Drive Belt Removal & Installation in Section 02
Engine).
4. Remove the crankshaft pulley (See Crankshaft Pul- ley Removal & Installation in Section 02 Engine).
5. Remove the timing belt lower cover (See Timing Belt Lower Cover Removal & Installation in Section
02 Engine).
6. Remove the crankshaft position sensor retaining bolts (1).
(Tighten: Crankshaft position sensor retaining bolt
to 20 N·m)
7. Installation is in the order of removal.
ON-VEHICLE SERVICE
LTSM030012
03–542Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 2.4L ENGINE SYMPTOM DIAGNOSIS
Symptom Diagnostic Tests03-544
General Troubleshooting Checks 03-544
Visual Inspection 03-544
Diagnostic Help 03-544
Symptom Diagnostic Test List 03-544
Engine Cranks Normal But Will Not
Start 03-545
Engine Will Not Crank 03-547Hard Start / Long Crank / Erratic Start /
Erratic Crank
03-549
Fast Idle 03-552
Lack / Loss Of Power 03-553
Back Fires 03-556
Engine Poor Driveability 03-558
Low Idle / Stalls During Deceleration 03-562
Idle Speed Slow Return To Normal Idle 03-564
03
03–543Chery 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 5.CHECK ENGINE CYLINDER COMPRESSION
• Perform a compression test on the engine.
Is engine compression correct?
Ye s>>Verify test results. If OK, see Diagnostic Test List to repair any additional symptoms.
No
>>Check for cause.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03–546Chery 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.