2009 CHERY TIGGO ECU

Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
Parking Brake Warning Light
The parking brake switch is incorporated in the circuit for the red warning lamp in the dash. The switch will cause the
lamp to illuminate only when the parking brakes are applied. If the lamp remains on after parking brake release, the
switch or circuit is faulty.
Parking Brake Operation
The leading cause of improper parking brake operation, is excessive clearance between the parking brake shoes and
the shoe braking surface. Excessive clearance is a result of lining and/or drum wear, drum surface machined over-
size.
In most cases, the actual cause of an improperly functioning parking brake (too loose/too tight/won’t hold), can be
traced to a parking brake component.
Inspect the following when diagnosing a parking brake problem:
•Brake shoe wear
• Drum surface (in rear rotor) machined oversize
• Front cable not secured to lever
• Rear cable not attached to actuator
• Rear cable seized
• Parking brake lever not seated
• Parking brake lever bind
Parking Brake Adjustment
Adjust the parking brake only if the parking brake lever can be pulled up more than 3 notches without having an
adequate solid braking effect.
NOTE :
Excessive parking brake lever travel (sometimes described as a loose lever or too loose condition), could be the
result of worn brake shoes, improper brake shoe adjustment, or improperly assembled brake parts. A too loose con-
dition can also be caused by inoperative or improperly assembled parking brake components. Always confirm that the
parking brake components are assembled properly. Perform the following procedure to adjust the parking brake:
1. Verify the parking brake lever is in the released (down) position.
2. Raise and support the vehicle.
3. Remove the wheel mounting nuts and the rear tire and wheel assemblies.
4. Utilizing the access hole in the rotors, adjust the parking brake shoes.
5. Reach inside the vehicle and fully apply and release the parking brake.
6. With the parking brake lever in the fully applied (up) position, attempt to rotate the rear rotors by hand (to ensure that the parking brake shoes are working properly).
7. With the parking brake lever in the released (down) position, attempt to rotate the rear rotors by hand (to ensure that the parking brake shoes are not dragging).
8. Install both rear tire and wheel assemblies and the wheel mounting nuts. (Tighten: Wheel mounting nuts to 110 N·m)
12–82Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 5. Remove the evaporator assembly lower retainingbolts (1).
6. Disconnect the electrical connectors. Remove the evaporator assembly.
7. Installation is in the reverse order of removal.
Installation Notes:
• Lubricate new rubber O-ring seals with clean refrigerant oil and install them and new gaskets onto the refriger-
ant line fittings.
• Use only the specified O-rings as they are made of a special material for the R-134a system.
• Use only refrigerant oil recommended for the A/C compressor in the vehicle.
• Recharge the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Condition-
ing).
Blower Motor
Description
The blower motor is mounted in the HVAC housing. The following are blower motor functions:
•The blower motor will operate whenever the ignition switch is in the ON position and the blower motor control
is in any position except Off.
• The blower motor can be accessed for service from underneath the instrument panel.
• The blower motor and blower motor wheel are factory balanced as an assembly and cannot be adjusted or
repaired and must be replaced if found inoperative or damaged.
Operation
The blower motor is used to control the velocity of air moving through the HVAC housing by spinning the blower
wheel within the HVAC air inlet housing at the selected speed. The blower motor is a 12-volt, direct current (DC)
motor mounted within a plastic housing with an integral wire harness connector. The blower wheel is secured to the
blower motor shaft and is positioned within the air inlet housing on the passenger side of the HVAC housing.
ON-VEHICLE SERVICE
LTSM130014
13–30Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
Mechanical Problems
Possible locations or causes of insufficient heat:
•An obstructed cowl air intake.
• Obstructed heater system outlets.
• A blend door not functioning properly.
• Trapped air in system.
Temperature Control
If the heater outlet air temperature cannot be adjusted with the temperature control knob(s) on the A/C heater control
panel, the following could require service:
•The A/C heater control.
• The blend door actuator(s).
• The wire harness circuits for the A/C heater control or the blend door actuator(s).
• The blend door(s).
• Improper engine coolant temperature.
A/C Compressor Noise Testing
When investigating an A/C system related noise, you must first know the conditions under which the noise occurs.
These conditions include: weather, vehicle speed, transaxle in gear or neutral, engine speed, engine temperature,
and any other special conditions. Noises that develop during A/C operation can often be misleading. For example:
what sounds like a failed bearing, may be caused by loose bolts, nuts, mounting brackets or a loose compressor
assembly.
NOTE :
The A/C compressor must be replaced if any unusual noise is heard from the compressor itself.
NOTE :
Drive belts are speed sensitive. At different engine speeds and depending upon drive belt tension, drive belts can
develop noises that are mistaken for an A/C compressor noise. Improper drive belt tension can cause a misleading
noise when the compressor is operating at maximum displacement, which may not occur when the compressor is at
minimum displacement.
1. Select a quiet area for testing.
2. Duplicate the complaint conditions as much as possible.
3. Turn the A/C system On and Off several times to clearly identify any compressor noise.
4. Listen to the A/C compressor while it is operating at maximum and minimum displacement.
5. Probe the A/C compressor with an engine stethoscope or a long screwdriver with the handle held to your ear to better localize the source of the noise.
6. To duplicate high-ambient temperature conditions (high head pressure), restrict the air flow through the A/C con- denser. Install a manifold gauge set or a scan tool to ensure that the discharge pressure does not exceed 2600
kPa.
7. Check the condition of the accessory drive belt. NOTE: The A/C compressor must be replaced if the drive hub is broken or if the compressor shaft does not
rotate smoothly.
8. Check the compressor hub and pulley and bearing assembly. Ensure that the hub and pulley are properly aligned and that the pulley bearing is mounted securely to the A/C compressor.
9. Check the refrigerant system plumbing for incorrect routing, rubbing or interference, which can cause unusual noises. Also check the refrigerant lines and hoses for kinks or sharp bends that will restrict refrigerant flow, which
can cause noises.
10. Loosen all of the compressor mounting hardware and retighten. CAUTION: Do not run the engine with a vacuum pump in operation or with a vacuum present within the
A/C system. Failure to follow this caution will result in serious A/C compressor damage.
11. If the noise is from opening and closing the high pressure relief valve, recover, evacuate and recharge the refrig- erant system. If the high pressure relief valve still does not seat properly, replace the A/C compressor.
13
13–35Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Removal & Installation
1. Disconnect the negative battery cable.
2. Evacuate the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Conditioning).
3. Remove the front bumper (See Front Bumper Removal & Installation in Section 15 Body & Accessories).
4. Remove the nut (3) that secures the A/C high-pres-sure liquid line to the A/C condenser. Remove and
discard the O-ring seal and gasket.
NOTE: After removing the A/C lines, plug the A/C
lines to prevent any debris from entering the A/C
system.
5. Remove the nut (2) that secures the A/C high-pres- sure gas line to the A/C condenser. Remove and
discard the O-ring seal and gasket.
6. Remove the condenser mounting bolts (1).
7. Remove the condenser from the engine compartment.
8. Installation is in the reverse order of removal.
Installation Notes:
• Lubricate new rubber O-ring seals with clean refrigerant oil and install them and new gaskets onto the refriger-
ant line fittings.
• Use only the specified O-rings as they are made of a special material for the R-134a system.
• Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
• Recharge the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Condition-
ing).
Accumulator
Description
The accumulator is connected directly between the condenser and the expansion valve. Accumulator is used on sys-
tems that use an orifice tube to meter refrigerants into the evaporator.
Operation
The primary function of the accumulator is to isolate the compressor from any damaging liquid refrigerant. The accu-
mulator removes debris and moisture from the air conditioning system.
Removal & Installation
1. Disconnect the negative battery cable.
2. Evacuate the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Conditioning).
ON-VEHICLE SERVICE
LTSM130005
13
13–43Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 3. Remove the bolt (2) that secures the A/C liquid and suction line assembly to the A/C expansion valve.
4. Remove the lines retaining bolts (1).
5. Remove the A/C liquid line assembly from the A/C evaporator to compressor and remove and discard the seals.
6. Install plugs in, or tape over the opened refrigerant line fittings and the evaporator ports.
7. Remove the A/C liquid line assembly from accumulator to condenser and from accumulator to evaporator.
8. Installation is in the reverse order of removal.
Installation Notes:
• Lubricate new rubber O-ring seals with clean refrigerant oil and install them and new gaskets onto the refriger-
ant line fittings.
• Use only the specified O-rings as they are made of a special material for the R-134a system.
• Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
• Recharge the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Condition-
ing).
Suction Line
Description
The A/C suction line connects the A/C compressor to the A/C accumulator.
Operation
The low pressure A/C suction line is the refrigerant line that carries refrigerant from the A/C accumulator to the A/C
compressor. Air conditioning hoses are designed to control liquid and gas at high pressures and temperatures. The
hoses are usually flexible and equipped with special metal fittings at the ends to prevent leaks and provide a sure
seal and connection between components.
Removal & Installation
1. Disconnect the negative battery cable.
2. Evacuate the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Conditioning).
ON-VEHICLE SERVICE
LTSM130007
13
13–45Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 3. Remove the bolt (2) that secures the A/C liquid and suction line assembly to the A/C expansion valve.
4. Remove the nuts (1) that connect the suction lines to the A/C accumulator.
5. Remove the lines retaining bolts (3).
6. Remove the nut (1) that connect the suction line tothe A/C compressor.
7. Install plugs in, or tape over the opened refrigerant line fittings and the evaporator ports.
8. Remove the A/C suction line assembly from evaporator to compressor.
9. Installation is in the reverse order of removal.
Installation Notes:
• Lubricate new rubber O-ring seals with clean refrigerant oil and install them and new gaskets onto the refriger-
ant line fittings.
• Use only the specified O-rings as they are made of a special material for the R-134a system.
• Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
• Recharge the A/C system (See A/C System Evacuation and Recharge in Section 13 Heating & Air Condition-
ing).
ON-VEHICLE SERVICE
LTSM130016
LTSM130015
13–46Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine RESTRAINTS
14
CONTENTSpage
Airbag System ....................................................................... 14-1
Seat Belt System .................................................................... 14-50
AIRBAG SYSTEM
GENERAL INFORMATION14-2
Description 14-2
Operation 14-2
Specifications 14-2
Special Tools 14-3
Electrical Schematics 14-4
Airbag Control Module Connector Pin-Out
Table 14-7
DIAGNOSIS & TESTING14-8
Diagnostic Help 14-8
Intermittent DTC Troubleshooting 14-8
Ground Inspection 14-8
Diagnostic Tools 14-8
Diagnostic Trouble Code (DTC) List 14-9
Restraints Control Module DTC List 14-9
Diagnostic Trouble Code (DTC) Tests 14-11
B1102 - Battery Voltage Low 14-11
B1346 - Driver Airbag Resistance Too
High Or Open (1st Stage) 14-16B1352 - Passenger Airbag Resistance
Too High Or Open (1st Stage)
14-23
B2501 - Warning Lamp Fault-Open 14-29
B2503 - Warning Lamp Fault-Short To
Ground 14-33
B2504 - Warning Lamp Fault-Short To
Battery 14-37
B1620 - Internal Fault - Replace ECU 14-41ON-VEHICLE SERVICE14-46
Airbag System Disarming Procedure 14-46
Description 14-46
Driver Side Airbag 14-46
Removal & Installation 14-46
Front Passenger Side Airbag 14-47
Removal & Installation 14-47
Restraints Control Module (RCM) 14-49
Removal & Installation 14-49
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14–1Chery 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 DTC cannot be deleted, it is a current fault.
4. Use 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 Restraints Control Module (RCM) grounds that are related to 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, foreign material.
• A data recorder, and/or oscilloscope should be used to help diagnose intermittent conditions.
• Remove the Restraints Control Module (RCM) from the troubled vehicle and install in a new vehicle and test. If
the DTC cannot be deleted, the RCM is malfunctioning. If the DTC can be deleted, return the RCM 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 affect 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
Diagnostic Scan Tool X-431
Read the following when connecting the X-431 scan tool:
•Connect the scan tool to the Data Link Connector (DLC) for communication with the vehicle.
• The DLC is located on the driver side compartment under the steering column (it is attached to the instrument
panel and accessible from the driver seat).
• The DLC is rectangular in design and capable of accommodating up to 16 terminals.
• The electrical connector has keying features to allow easy connection.
14–8Chery Automobile Co., Ltd.