Downloaded from www.Manualslib.com manuals search engine Back Fires
The following conditions apply to this symptom:
•The engine will back fire when operated.
• The engine back fire occurs at all operating parameters.
1.PRELIMINARY CHECKS
• Carry out the following preliminary checks:
Vacuum lines (check for damage and correct routing).
Spark plug wire routing (correct firing order).
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 the ignition switch on.
• With the scan tool X-431, select view DTC and stream data 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
Spark plug wires
Spark plugs
4.CHECK FUEL QUALITY
• Check fuel quality (concerns such as correct octane, contamination).
Is the fuel quality OK?
Ye s>>Go to the next step.
No
>>Repair as necessary.
Verify the symptom no longer exists.
ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS
03–556Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine GENERAL INFORMATION
Description
The fuel system consists of a fuel tank with a reservoir, fuel pump, fuel filter, fuel delivery line, fuel rail, fuel rail pulse
damper and fuel injectors. The Engine Control Module (ECM) controls the fuel system based on signal inputs. The
immobilizer module signals the ECM to activate the fuel system. If the ECM does not receive the proper signal from
the immobilizer module, the ECM will not allow the fuel system to operate.
•The ACTECO engine utilizes a returnless fuel delivery system.
• The MITSUBISHI engine utilizes a fuel return fuel delivery system.
WARNING!
Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related
component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instruc-
tions may result in serious personal injury.
Fuel Filler Assembly
1 - Fuel Filler Cap Assembly
2 - Fuel Filler Shield
3 - Fuel Filler Tube Assembly
4 - Bolt
5 - Hose Clamp
6 - Fuel Filler Hose
7 - Fuel Filler Air Hose8 - Fuel Tank Assembly
9 - Electric Fuel Pump Assembly
10 - Fuel Delivery Pipe Assembly
11 - Fuel Return Pipe Assembly
12 - Hose Clamp
13 - Bolt
LTSM040008
04–2Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine Operation
The fuel delivery system is enabled when it reaches the following conditions:
•Turn the ignition switch ON (engine off), the fuel delivery system is enabled for 3-6 seconds.
• The Engine Control Module (ECM) receives a Crankshaft Position (CKP) sensor signal.
The fuel injectors are a solenoid-operated valve that meter fuel flow to each cylinder. The fuel injectors are opened
and closed constantly during engine operation. The amount of fuel is controlled by the length of time the fuel injector
is held open. The fuel injectors are powered by a 12 V source and are controlled through the ground side of the
circuit by the ECM.
The fuel pump operation is defined in the fuel system control strategy and is controlled by the ECM.
Specifications
Torque Specifications
DESCRIPTION TORQUE (N·m)
Fuel Rail Bracket Bolts 11
Fuel Filter Mounting Bolts 10
EVAP Emissions Assembly
1 - Fuel Filter Assembly
2 - Fuel Delivery and Return Pipes
3 - EVAP Pipe I
4 - Fuel Delivery Pipe III
5 - Fuel Delivery Pipe IV
6 - Air Duct
7 - Fuel Delivery Pipe V
8 - Pipe Clamps9 - EVAP Hose V
10 - Fuel Delivery Hose
11 - Air Duct
12 - Canister Assembly
13 - Canister Bracket Assembly
14 - Bolt
15 - EVAP Hose I
GENERAL INFORMATION
LTSM040010
04–4Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine ON-VEHICLE SERVICE
Fuel Pressure Relief Procedure
Description
WARNING!
Fuel in the fuel system remains under high pressure, even when the engine is not running. Before servicing or
disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to
prevent accidental spraying of fuel. Failure to follow these instructions may result in serious personal injury or
death.
Perform the following procedure to relieve fuel pressure from the fuel system:1. Remove the cover of the front fuse and relay box.
2. Identify and remove the fuel pump relay from the front fuse and relay box.
3. Start and run engine until it stalls.
4. Attempt to restart engine until it will no longer run.
5. Turn the ignition key to the OFF position.
Fuel Pump
Description
The fuel pump assembly contains the fuel pump motor and fuel level sensor.
Operation
The Engine Control Module (ECM) activates the fuel pump relay for several seconds after the ignition switch is
turned ON. When the relay is activated, it provides voltage to the fuel pump. When the ECM receives an engine
speed signal from the Crankshaft Position (CKP) sensor and a signal from the Immobilizer control module, the ECM
will energize the fuel pump relay.
NOTE :
• The electric fuel pump has different flow ratings based on engine requirements
• For service, the part number of the replacement fuel pump must be the equivalent of the original fuel pump
• Do not operate the fuel pump dry, this will damage the fuel pump
• Keep the fuel tank and pipeline clean, and replace the fuel filter if the fuel pump is replaced
Removal & Installation
WARNING!
Release fuel system pressure before servicing fuel system components. Service vehicles in well-ventilated areas
and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or death.
NOTE :
The following special tool is required to perform the repair procedure:
•CH-20032 - Fuel Pump Remover
1. Release the fuel system pressure (See Fuel Pressure Relief Procedure in Section 04 Fuel Delivery).
2. Disconnect the negative battery cable.
3. Remove the rear seat cushion.
04
04–15Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
Diagnostic Help
1. The X-431 scan tool connects to the Data Link Connector (DLC) and communicates with the vehicle electronicmodules through the data network.
2. Confirm that the malfunction is current and carry-out the diagnostic tests and repair procedures.
3. If the Diagnostic Trouble Code (DTC) cannot be deleted, it is a current fault.
4. Use only a digital multimeter to perform voltage readings on electronic systems.
5. Refer to any Technical Bulletins that may apply to the failure.
6. Visually inspect the related wiring harness.
7. Inspect and clean all Engine Control Module (ECM) grounds that are related to the most current DTC.
8. If numerous trouble codes were set, use a wiring schematic and look for any common ground circuits or voltage supply circuits that may apply to the DTC.
Intermittent DTC Troubleshooting
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.
• Wiggle the related wiring harness and connectors while looking for an interrupted signal on the affected circuit.
• If possible, try to duplicate the conditions under which the DTC set.
• 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 dam-
age, or foreign material.
• A data recorder, and/or oscilloscope should be used to help diagnose intermittent conditions.
• Remove the Engine Control Module (ECM) from the troubled vehicle and install in a new vehicle and test. If
the DTC cannot be deleted, the ECM is malfunctioning. If the DTC can be deleted, return the ECM to the origi-
nal vehicle.
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. Diagnostic Scan Tool X-431
2. Digital Multimeter
3. Jumper Wire
Transaxle Control Module (TCM) Electrical Harness Test Tool
If using a TCM electrical harness test tool, you can diagnose the TCM harness while the TCM is still connected.
•Measure sensor and solenoid resistance (always measure resistance with the power off).
• Measure the signal voltage of the TCM (always measure voltage with the power on).
08
08–19Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine Diagnostic Procedure
1.CHECK A/T SOLENOID SIGNAL
• With the scan tool, select view DTC and data stream for A/T.
• Start the engine.
• Monitor the gear position while driving, and compare to the following table.
TRANSAXLE GEAR POSITION/SOLENOID ACTIVATION
SELECTOR POSITION RANGESHIFT
SOLENOID VA LV E 1 SHIFT
SOLENOID VA LV E 2 SHIFT
SOLENOID VA LV E 3 SHIFT
SOLENOID VA LV E 4
P0- - # -
RR----
N0- - # -
D 1- - # #
2- # - #
3----
4# # -
-
•
#: Operating component
Is the check result normal?
Ye s>>The condition that caused this DTC is intermittent (See Diagnostic Help in Section 08 Transaxle &
Transfer Case).
No
>>Go to the next step.
2.ACTUATE TEST
• Stop the engine.
• Turn ignition switch on.
• With X-431 scan tool, perform the solenoid actuate test.
• The solenoid actuation should be heard.
Is the check result normal?
Ye s>>Go to step 4.
No
>>Go to the next step.
DIAGNOSIS & TESTING
08–30Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine Diagnostic Procedure
1.CHECK A/T SOLENOID SIGNAL
• With the scan tool, select view DTC and data stream for A/T.
• Start the engine.
• Monitor the gear position while driving, and compare to the following table.
TRANSAXLE GEAR POSITION/SOLENOID ACTIVATION
SELECT
POSITION RANGESHIFT
SOLENOID VA LV E 1 SHIFT
SOLENOID VA LV E 2 SHIFT
SOLENOID VA LV E 3 SHIFT
SOLENOID VA LV E 4
P0- - # -
RR----
N0- - # -
D 1- - # #
2- # - #
3----
4# # -
-
•
#: Operating component
Is the check result normal?
Ye s>>The condition that caused this DTC is intermittent (See Diagnostic Help in Section 08 Transaxle &
Transfer Case).
No
>>Go to the next step.
2.ACTUATE TEST
• Stop the engine.
• Turn ignition switch on.
• With X-431 scan tool, perform the solenoid actuate test.
• The solenoid actuation should be heard.
Is the check result normal?
Ye s>>Go to step 5.
No
>>Go to the next step.
DIAGNOSIS & TESTING
08–34Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine Diagnostic Procedure
1.CHECK A/T SOLENOID SIGNAL
• Turn ignition switch on.
• With the scan tool, select view DTC and data stream for A/T.
• Monitor the value of the multi-function switch and compare to the following table.
TRANSAXLE RANGE SWITCH (CMF) CONDITION
SHIFT
LEVER
POSITION P/N S2 S3 S4
P Close Close Open Open
R Open Close Close Close
N Close Open Close Open
D Open Open Open Close
M Close Close Close Open + Close Close Close Open - Close Close Close Open
SEQUENCE SHIFT SWITCH CONDITION
SHIFT LEVER POSITION SEQUENCE SHIFT UPSEQUENCE SHIFT DOWN
R Active Active
P Active Active
N Active Active
D Active Active
M Not Active Not Active
+ Not Active Active
- Active Not Active
Is DTC P0705 present and the status active for this DTC?
Ye s>>Go to the next step.
No
>>The condition that caused this DTC is intermittent (See Diagnostic Help in Section 08 Transaxle &
Transfer Case).
DIAGNOSIS & TESTING
08
08–39Chery Automobile Co., Ltd.