2009 CHERY TIGGO check engine

Downloaded from www.Manualslib.com manuals search engine 8.CHECK ECM ELECTRICAL CONNECTOR
• Inspect the ECM electrical connector pins for proper fit or any chafed, pierced, pinched, or partially broken
wires.
• With the X-431 scan tool, read ECM DTC.
Is the check result normal and DTC U0001 not present?
Ye s>>The system is now operating properly.
Reassemble the vehicle and road test to verify the customers complaint is repaired.
No
>>Replace the ECM.
NOTE : The Immobilizer control module must be matched to the new ECM (See ECM Removal & Instal-
lation in Section 03 Electronic Engine Controls).
The problem caused by ECM internal error.
DIAGNOSIS & TESTING
03–426Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 6. Installation is in the reverse order of removal.
NOTE :
After installing the engine coolant temperature sensor, check the coolant level.
Knock Sensor
Description
The knock sensor is attached to the cylinder block. The knock sensor is designed to detect engine vibration that is
caused by detonation.
Operation
When the knock sensor detects a knock in one of the cylinders, it sends an input signal to the Engine Control Module
(ECM). In response, the ECM retards ignition timing for all cylinders by a specified amount.
The knock sensor contains a piezoelectric material which constantly vibrates and sends an input voltage (signal) to
the ECM while the engine operates. As the intensity of the vibration increases, the knock sensor output voltage also
increases.
The ECM ignores knock sensor input during engine idle conditions. Once the engine speed exceeds a specified
value, knock retard is allowed.
Removal & Installation
1. Disconnect and isolate the negative battery cable.
2. Disconnect the knock sensor electrical connector.
3. Remove the knock sensor retaining bolt (1) and
remove the knock sensor.
(Tighten: Knock sensor retaining bolt to 20 N·m)
4. Installation is in the reverse order of removal.
Oxygen Sensor
Description
This vehicle is equipped with two oxygen sensors (upstream oxygen sensor & downstream oxygen sensor). The oxy-
gen sensors are located before and after the three way catalyst. The oxygen sensors continually monitor the oxygen
level in the exhaust gas. The sensor is made of ceramic zirconia. The zirconia generates voltage from approximately
1 volt in richer conditions to 0 volt in leaner conditions.
Operation
The O2 sensors produce voltages from 0 to 1 volt, depending upon the oxygen content of the exhaust gas. When a
large amount of oxygen is present (caused by a lean air/fuel mixture, can be caused by misfire and exhaust leaks),
the sensors produces a low voltage. When there is a lesser amount of oxygen present (caused by a rich air/fuel
mixture, can be caused by internal engine problems) it produces a higher voltage. By monitoring the oxygen content
and converting it to electrical voltage, the sensors act as a rich-lean switch.
The oxygen sensors are equipped with a heating element that keeps the sensors at proper operating temperature
during all operating modes. Maintaining correct sensor temperature at all times allows the system to enter into closed
loop operation sooner. Also, it allows the system to remain in closed loop operation during periods of extended idle.
ON-VEHICLE SERVICE
BESM030018
03–428Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 2.4L ENGINE CONTROLS
GENERAL INFORMATION03-442
Description 03-442
Operation 03-442
Electronic Engine Control Input & Output
Device Failure Modes 03-443
Specifications 03-444
Special Tools 03-445
Electrical Schematics 03-447
ECM Connector Pin-Out Table 03-457
DIAGNOSIS & TESTING03-458
Diagnostic Help 03-458
Diagnostic Logic 03-458
Ground Inspection 03-459
Diagnostic Tools 03-459
Diagnostic Trouble Code (DTC) List 03-461
ECM Power Supply and Ground Circuit
Test 03-462
Power Supply And Ground Circuit
Diagnostic Check 03-462
Diagnostic Trouble Code (DTC) Tests 03-469
11 - Oxygen Sensor 03-469
12- Air Flow Sensor 03-476
13 - Air Temperature Sensor 03-482
14 - Throttle Position Sensor 03-487
21 - Coolant Temperature Sensor 03-493
22 - Crankshaft Position Sensor 03-498
23 - Camshaft Position Sensor 03-504
25 - Atmosphere Pressure Sensor 03-510
31 - Knock Sensor 03-515
41 - Injector 03-519
44 - Ignition Signal 03-525
ON-VEHICLE SERVICE03-531
Engine Coolant Temperature (ECT)
Sensor 03-531
Description 03-531
Operation 03-531
Removal & Installation 03-531
Coolant Temperature Sensor (For
Instrument Cluster) 03-532
Description 03-532
Operation 03-532
Removal & Installation 03-532Knock Sensor
03-533
Description 03-533
Operation 03-533
Removal & Installation 03-533
Oxygen Sensor 03-533
Description 03-533
Operation 03-533
Upstream Oxygen Sensor 03-534
Downstream Oxygen Sensor 03-534
Removal & Installation - Upstream
Oxygen Sensor 03-534
Removal & Installation - Downstream
Oxygen Sensor 03-535
Camshaft Position (CMP) Sensor 03-536
Description 03-536
Operation 03-536
Removal & Installation 03-536
Air Flow Sensor 03-537
Description 03-537
Operation 03-537
Removal & Installation 03-537
Throttle Control Actuator 03-538
Description 03-538
Operation 03-538
Removal & Installation 03-538
Engine Control Module (ECM) 03-539
Description 03-539
Operation 03-539
Removal & Installation 03-539
Throttle Position Sensor (TPS) 03-540
Description 03-540
Operation 03-540
Removal & Installation 03-540
Idle Air Control (IAC) Motor 03-541
Description 03-541
Operation 03-541
Removal & Installation 03-541
Crankshaft Position (CKP) Sensor 03-542
Description 03-542
Operation 03-542
Removal & Installation 03-542
03
03–441Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine GENERAL INFORMATION
Description
The Engine Control Module (ECM) consists of a microcomputer and connectors for signal input and output and for
power supply. The ECM controls the engine.
The following are the input and output components monitored by the ECM. The monitored functions include compo-
nents from the engine, ignition, transaxle, air conditioning, or any other ECM supported subsystem.
ECM Inputs
•Brake Switch Sensor
• Camshaft Position (CMP) Sensor
• Crankshaft Position (CKP) Sensor
• Engine Coolant Temperature (ECT) Sensor
• Air Flow Sensor
• Coolant Temperature Sensor (For Instrument Cluster)
• Throttle Position Sensor (Integral with Electronic Throttle Control Actuator)
• Power Steering Switch
• Knock Sensor
• Oxygen Sensor (Upstream & Downstream)
• Clutch Pedal Switch (Manual transmission only)
ECM Outputs
• Canister Control Valve
• Fuel Injectors
• Fuel Pump Relay
• Electronic Throttle Control Actuator
• Ignition Coil
• A/C Compressor
• Cooling Fan
• Oxygen Sensor heating coil (Upstream & Downstream)
Operation
The ECM monitors components and circuits and tests them in various ways depending on the hardware, function,
and type of signal. For example, analog inputs such as throttle position or engine coolant temperature are typically
checked for opens, shorts and out-of-range values. This type of monitoring is carried out continuously. Some digital
inputs like vehicle speed or crankshaft position rely on rationality checks - checking to see if the input value makes
sense at the current engine operating conditions. These types of tests may require monitoring several components
and can only be carried out under appropriate test conditions.
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.
03–442Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
Diagnostic Help
1. Confirm that the malfunction is current and carry-out the diagnostic tests and repair procedures.
2. If the Diagnostic Trouble Code (DTC) cannot be deleted, it is a current fault.
3. Use a digital multimeter to perform voltage readings on the Electronic Fuel Injection (EFI) system.
4. The scan tool connects to the Data Link Connector (DLC) and communicates with the ECM.
5. If the failure is intermittent perform the following:•Check for loose connectors.
• Look for any chafed, pierced, pinched, or partially broken wires.
• Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
• Look for the data to change or for the DTC to reset during the wiggle test.
• Look for broken, bent, pushed out or corroded terminals.
• Inspect the sensor and mounting area for any condition that would result in an incorrect signal, such as
damage or foreign material.
6. Remove the ECM from the troubled vehicle and install in a new vehicle and test. If the DTC can not be deleted, the ECM is malfunctioning. If the DTC can be deleted, return the ECM to the original vehicle.
Diagnostic Logic
If the DTC can not be deleted, it is a current failure.
If the DTC can be deleted, it is an intermittent incident. In many cases, the malfunction resolves itself (the part or
circuit function returns to normal without intervention). It is important to realize that the symptoms described in the
customer’s complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent causes of inter-
mittent incidents occurrences is poor electrical connections. Because of this, the conditions under which the incident
occurred may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not
indicate the specific malfunctioning area.
Check if it is because of the loosening of cable joint.
Look for any chafed, pierced, pinched, or partially broken wires.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Look for broken, bent, pushed out or corroded terminals.
Inspect the sensor and mounting area for any condition that would result in an incorrect signal, such as damage,
foreign material.
Refer to any Technical Service Bulletins that may apply.
DIAGNOSTIC REFERENCE
•Check ground terminals for corroding or loose connection. Refer to Ground Inspection.
• Search for electrical incident. Refer to Diagnosis for an Electrical Incident.
• Check connector terminals. Refer to How to Check Terminal.
DURING ENGINE CHECKS AND REPAIRS USE CAUTION NOT TO HARM THE ENGINE MECHANICAL SYSTEM
• Check cylinder pressure.
• Check ignition timing.
• Check fuel system pressure.
• Check the EVAP system.
• Check for vacuum leaks.
• Check output of the TPS.
• Check the injectors for leaks.
Remove and install the doubtful ECM to a new vehicle and test it. If the DTC can not be deleted, the malfunction is
inside of ECM; if the DTC can be deleted, change the original ECM back and check it again according to above
items.
Inspect and clean all ECM, engine, and body grounds that are related to the DTC. If numerous trouble codes were
set, use a wire schematic and look for any common ground or supply circuits for any camshaft pulley DTCs inspect
for dirt/metal debris.
03–458Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Use the scan tool to perform a System Test if one applies to a failing component. A co-pilot, data recorder, and/or
oscilloscope should be used to help diagnose intermittent conditions.
CAUTION:
Before starting repairs which do not require battery power:
•Turn ignition switch off.
• Disconnect the negative battery terminal.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground connec-
tions are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can become an unwanted
resistance. This added resistance can alter the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drastically
affect an electronically controlled circuit. A poor or corroded ground can effect the circuit. Perform the following when
inspecting a ground connection:
1. Remove the ground bolt or screw.
2. Inspect all mating surface for tarnish, dirt, rust, etc.
3. Clean as required to assure good contact.
4. Reinstall bolt or screw securely.
5. Inspect for add-onaccessories which may be interfering with the ground circuit.
6. If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the wires are clean, securely fastened and providing a good ground path. If multiple wires are crimped to one eyelet, make
sure no excess wire insulation has been crimped creating a bad ground.
Diagnostic Tools
1. Scan Tool X-431
2. Engine Analyzer (KES-200)
3. Digital Multimeter
4. Jumper Wire
Hardware Requirements
The hardware configuration of X-431 is as follows:
DIAGNOSIS & TESTING
03
03–459Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine ECM Power Supply and Ground Circuit Test
Power Supply And Ground Circuit Diagnostic Check
DIAGNOSIS & TESTING
LTSMW030003T
03–462Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Check reference values between ECM terminals and ground under the following conditions:
TERMINAL NO.ITEMCONDITIONDATA (DC VOLTAGE)
12 Power supply for ECM Ignition switch: ON Battery Voltage (11 - 14 V)
25
34 ECM relayIgnition switch: OFF
More than a few seconds
after turning ignition switch OFF Battery Voltage (11 - 14 V)
64 Battery All timeBattery Voltage (11 - 14 V)
66 Ignition switch Ignition switch: ON Battery Voltage (11 - 14 V)
Ignition switch: OFF Approximately 0 V
DIAGNOSIS & TESTING
03
03–463Chery Automobile Co., Ltd.