Electrical parking system

Safety prevention

Cautions for electrical technicians using medical electrics

Keypoint checking before maintenance

Cautions for "safety airbag"and"safety belt preloaded"of auxiliary constraint system

Cautions for removing 12V battery

Cautions for Electrical parking(EPB) maintenance

Preparation work

Special tools

Commonly used tools

System description

Component part

Position of component parts

Description of related parts

System

System description

System principle

Input and output signal

EPB operation

Condition s for indicator light and fault light

Schematic diagram

Safety and invalid

Stitch definition of connectors

Stitch definition of connectors of parking ECU assembly

Stitch definition of connectors of executive mechanical

Basic check

Diagnosis and maintenance process

Fault diagnosis process details

Diagnosis working list

Description

Working process

Fault code, circuit fault diagnosis

Remove and installation

Explosion diagram

Remove and installation

Remove

Safety prevention

Cautions for electrical technicians using medical electrics

Forbidden operation

Warning：

●     There is strong magnetic components on this vehicle

●     If technician use medical electrics,e.g electronic pacemakers, which couldn’t be operated in the vehicle ,otherwise,the function of electrics may be effected by strong magnetic components.

Cautions for normal charge

Warning:

●     If technician use the medical electrics like pacemakers, cardiovascular, in addition to the top, the machine only could be used after the function of machine checked and confirmed before normally operation.

●     In the normal charging operation, Medical electrics may be affected by electromagnetic wave. When Technicians use the medical electrics like pacemakers, cardiovascular, in addition to the top etc, it is not allowed to enter into crew capsule (including luggage).

Cautions for communication equipment

●     If technicians use the medical electrics like pacemakers, cardiovascular, in addition to the top etc, please keep enough distance with the communication equipment.

●     Remote intelligent terminal of electromagnetic waves may affect the function of the medical electrics like pacemakers, cardiovascular, in addition to the top etc.

●     If technicians use the medical electrics like pacemakers, cardiovascular, in addition to the top etc, remote intelligent terminal of electromagnetic waves may affect the function of the medical electrics. It is needed to let the manufacturer of the medial electrics confirm that the possible affection to medical electric equipment when using remote intelligent terminal.

Keypoint checking before maintenance

High pressure system can be run automatically, it is need to confirm that remote air conditioning and recharged regularly are not set before maintenance.

Cautions：

●     If set remote air-conditioner or charged regularly, even though the switch is closed, high pressure system can be run automatically.

Cautions for "safety airbag"and"safety belt preloaded"of auxiliary constraint system

The combination use of "safety airbag"and"safety belt preloaded"of auxiliary constraint system and front seat belt could decrease the damage to driver and passengers when collision. The auxiliary constraint system include seat belt, airbag for driver, airbag for co-driver. The detailed information for auxiliary constraint system could refers to the sections of “airbag system” and “seat belt”

Warning:

To avoid unexpected accident, we need to obey the following:

●     To avoid the auxiliary constraint system invalid, all the maintenance only could be operated by JAC authorized distributors because the risk of injury to people will be increased after invalid.

●     Non-standard auxiliary constraint system of maintenance including non-standard disassembly and installation, may result in auxiliary constraint system accident triggered, causing personal injury accidents. About remove the airbag module method, please see "airbag system" section.

●     In addition to the maintenance instructions in the manual operation, do not use electrical test equipment to test any circuit of auxiliary constraint system. Auxiliary constraint system of connectors and wiring harness use yellow or orange color.

Cautions when use electrical tools (pneumatic or electric)and hammer

●     when electric switch in the "ON" block, near the airbag diagnostic sensors or other sensor,  do not use power tools or hammer to operate sensor parts  area. Severe vibration may activate the sensor, some airbags, causing serious damage.

●     When using power tools or hammer, put the keys in the "LOCK" block, unplug the 12 v lead-acid battery cathode, waiting at least 1 minute, then for checking and maintenance.

Cautions for removing 12V battery

Turn the key to “on”,then to “lock” before remove 12v battery

Tip:

●     Even if the key in the "LOCK" and the 12 v battery charging function may start automatically.

●     After turn the key to "ON" --> "LOCK",  12 v battery automatic charging will not start.

Cautions for Electrical parking(EPB) maintenance

●     As a result of the dust in rear brake has an effect to human body, please use clear dust collector to clean before maintenance ,it is prohibited to use air gun blow out.

●     When electronic parking work, state of electronic parking lights lit on combination instrument.

●     When the electric parking in the event of a failure, the warning lights lit on the instrument (yellow).

Caution：

●     When the electronic parking is in fault state, if pull or press the EPB switch, failure indicator will light (yellow).

●     When the electronic parking happens fault and unable to release or could not connected to the 12 v battery, and must release the electronic parking at this time, please use external release way to release the parking brake, see "external release"

●     After change parking ECU assembly or parking ECU bracket, the parking ECU assembly is needed to be calibrated as zero, see "zero in parking ECU assembly learning".

Preparation work

Special tools

The actual tool shape may be different from illustration shown.

Commonly used tools

System description

This car is equipped with electronic parking brake (EPB) system. EPB recognition is from EPB switch signal, controlled by the ECU's assembly, which controls the brake caliper assembly clamping and release the parking brake. EPB switch layout is in the intermediate position of the assistant instrument board, which is convenient for the pilot operation.

Component part

Position of component parts

 

A Instrument panel

B Downside of instrument panel

C Rear suspension

Description of related parts

 

 

 

1Brake	2 outer releasing connection	3 executive mechanical
4 fixing bolt	5 Rear brake plier assembly

System

System description

When electronic parking brake works, lights on combination instrument and EPB switch will be on.

When parking brake is released, lights on combination instrument and EPB switch will be off

When the driver operate EPB switch, EPB switch will transfer the signal to the parking ECU assembly, which drives the executive mechanical of rear caliper assembly in parking  ECU assembly, executive mechanical push rear caliper brake to realize parking and release.

System principle

Input and output signal

 

EPB operation

EPB

Manual clamping

When vehicle stops, pull out the EPB switch, brake caliper assembly began to apply the parking brake force.

When the parking brake force reached set value, the parking status light is lit.

When the vehicle under the electricity, the parking status light is extinguished, the state in the EPB switch will be off 2 minutes later.

Tips：

    Parking brake force will maintain.

Pull out two times

When vehicle stops, pull out the EPB switch, brake caliper assembly began to apply the parking brake force.

When the parking brake force reached set value, the parking status light is lit.

Pull out the EPB switch again; EPB system will increase clamping force.

Tips：

    When you feel there is not enough parking power in the car, you can do this, such as when the vehicle in the larger ramp.

    When the vehicle is off power, parking status light is off and the status light on EPB switch will be off 2 minutes later.

Tips：

    Parking brake force will maintain.

Manual releasing

When the power switch is placed in the "ON" block, press down the brake pedal; and press the EPB switch at the same time, then the rear brake caliper assembly release parking.

Tips：

    It couldn’t release parking if only pressing down EPB switch.

    When electrical parking brake release fully, EPB status indicator light will be off.

Caution：

    When the power switch is placed in the "LOCK” or “ACC” block, it couldn’t release parking through above operation.

Automatic release

When start driving and comply with the following conditions, vehicle will automatically release the parking brake.

1)   Vehicle at “READY” status

2)   Driver’s safty belt fasten

3)   Door closed in driver’s side.

4)   Shift is in “D” or “R”

5)   Driver pedal down the accelerating pedal.

6)   Vehicle with enough power to assure no slip slope.

When Electrical parking brake releases fully, EPB status indicator light will be off.

Electrical off parking

If the driver don’t do the parking operation before leaving vehicle, if the power switch is on “LOCK” block, EPB system will automatically parking.

Automatic parking

Place the key on the block of “ON”, press down “AUTOHOLD” switch, automatically parking function will be open. When the vehicle meets the following condition, automatically parking will happen.

1)   Brake from the speed ＞4km/h to zero.

2)   Vehicle completely stops.

3)   The shift is on “N” shift.

When the road slope≤5%, EPB system will automatically parking after vehicle completely stopped for 2s.

When the road slope＞5%, EPB system will automatically parking once vehicle completely stopped.

Tips：

    This function is often used for urban traffic jam or ramp traffic condition, which has an impact on energy consumption and travel distance. it is not recommended to use in the general situation.

Braking in driving

In the process of driving, continuously pull the EPB switch, EPB system will provide brake force to make the vehicle deceleration, while brake lights up at the same time. When the vehicle is perfectly stopped, EPB system will exert maximum braking force and complete the parking.

In the EPB braking process, the EPB system will not lock the rear wheels and cause vehicle tail out.

If loosen the EPB switch before vehicle stopping, EPB system will be released in full, the brake lights at the same time, and vehicle driving back to normal.

Tips：

    With the method of pulled EPB switch to stop the vehicle, when the vehicle stops, the EPB system will exert maximum braking force, the vehicle impact will happen, which is not a fault.

 

Caution：

    When driving, pull out EPB switch, the brake force of EPB system producing is less than the braking force of hydraulic system providing, and the braking distance will be longer.

    This function should be used under the case of vehicle braking system invalid, frequent use can reduce life of rear brake.

Caution：

    When ABS fault light lit up, EPB system will no longer be anti-lock function, if pulled EPB switch at this time, EPB will impose a fixed braking force.

    When ABS fault light lit up, if pulled EPB switch on wet road, it will happen tail out. Please use the operation pull up and down, pull up and down again to let the vehicle stop. ABS故障灯点亮时，如

    When ABS fault light lit up, EPS system will not complete parking after vehicle stopped, it need release EPB switch and lull up again to complete parking.

    When ABS fault light lit up,  please don’t stop the vehicle on the slope road, otherwise, it may not parking .

Service release

When need to replace the rear brake caliper assembly, friction slices or brake disc, release parking could be through EPB switch.

①    When vehicle in flat road with slope ≤10％;

②    Put EPB in the releasing status and step down brake pedal.

③    Press EPB switch for 10s and loose the EPB switch and press again immediately, the operational mechnical will bring the piton to the maximum position, when you could take out the rear brake caliper friction slices or brake disc easily.

Tips：

    After finishing parts replacement or repair, pulled EPB switch for the first time, parking time will be long, which is a normal phenomenon.

External release

When power supply system of low voltage for vehicle is unusual, or parking ECU assembly and actuator are damaged, which might not release the parking brake through EPB switch, at this time, releasing the parking brake could use a special tool.

①    Remove the fixing bolts of executive mechanical and brake, take out the executive mechanical slightly.

②    Rotate screw in clockwise with special tool, release parking brake.

 

Caution：

    External release will damage seal ring between the actuator and brake, so unless confirming the brake caliper assembly damage, do not use external release.

    After external release, suggest replace rear brake caliper assembly.

Condition s for indicator light and fault light

When the electric switch turn from “ON” to “LOCK”or from the “LOCK” switch to “ON”, indicator light and fault light will light up to complete self-inspection.

Schematic diagram

Safety and invalid

When EPB system has fault, fault warning light will be on in the instrument.

When EPB system has fault, part of EPB function will be limited. When the system couldn’t parking, pull out or press down EPB switch, the indicator in the switch will flash and the yellow fault indicator light in the instrument will be on.

Tips：

    When electrical parking couldn’t be released through switch, please do “outer releasing” manually.

When multiple fault codes appear at the same time, rule out according to the fault grade step by step.

Tip：

Fault grade data is less, the grade is higher.

Stitch definition of connectors

Stitch definition of connectors of parking ECU assembly

Stitch definition of connectors of executive mechanical

Connectors of left and right actuator are the same, stitch definition is the same.

Basic check

Diagnosis and maintenance process

Fault diagnosis process details

1     Collect customer information

Before check, carefully ask customer concerns or driving vehicles together with the customer which is very important for solving the problem.

2          Check symptoms

According to the information collected through interviewing with the customer ,reappear information of customer specified symptoms. Check whether the symptoms caused by the failure mode.

Caution:

When symptoms are caused by normal operation, please fully inspect each related parts and let customers understand the symptoms are normal.

3          Diagnose whether there is fault code with diagnostic instrument

Yes>>record and delete fault code, turn to next step

No>> turn to “Normal symptom and analysis”

4          Fault confirmed again

Appears fault again and diagnose whether there is fault code with diagnostic instrument.

Yes>> turn to “fault code, electrical line fault diagnosis”

No>> check harness and connector based on discussion face to face, please see “ground and loop”

5          Maintenance or replace fault parts

Maintenance or replace fault parts, connect the connectors and harnesses again and delete fault code with diagnostic instrument.

6          Do the fault operation again to check whether there is a still fault symptom.

Yes>> back to step 3

No >> Finish maintenance

Diagnosis working list

In general, customers have their own judgment standard to a problem. Therefore, careful enough to ask to understand customer's concern is very important. Preparing interview list makes diagnostic information systematic. Sometimes, many conditions occur at the same time resulting in failure.

Interview list sample

 

 

Zero position learning of Parking ECU assembly

Description

Caution：

    When remove、change parking ECU assembly or bracket, zero position learning of  parking ECU assembly is needed to be done.

Working process

Caution：

    Diagnostic instrument must be used to carry out the offline learning.

1.   Vehicle preparation

①    Put the vehicle in the flat road.

②    Put the power-on switch in “OFF”shift.

2.   Check whether the installation state of parts of EPB system is normal, if it is normal, please enter into the next step. If not, please repair or replace defective parts.

3.   Put the power-on switch in “ON” block, check whether there is fault with echocardiography, if yes, check and repair. Please see "Fault code, circuit fault diagnosis”. If not, enter into the next step.

4.   Select "EPB," "off line zero calibration", "start". Complete zero learning based on diagnostic instrument.

Caution：

    Forbidden to operate EPB switch in the process of zero positioning learning.

5.   System fault diagnostic

①    Pull up EPB switch, do parking brake.

②    Step down the brake pedal, press down EPB switch and release parking brake.

6.   Diagnose whether there is fault code with diagnostic instrument, if yes, check and repair. Please see "Fault code, circuit fault diagnosis”. If not, enter into the next step.

7.   Delete previous fault

①   Put the power-on switch in “OFF” block, then put it in”ON”block after 10s.

Caution：

    Take action according to step ①

②   Clear historical fault, if successful, zero learning is over. If not, check the fault codes and carry out maintenance.

Fault code, circuit fault diagnosis

Parking ECU assembly fault C116045、C116040、C116042、C116055、C116086、C116054、C11604C、C116004、C116046、C116044、C11607C、C111329、C111396

 

1     Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of ECU assembly is damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4     Replace parking ECU assembly, please see “Remove and installation”

5     Execute zero position learning of parking ECU assembly; do self-diagnosis to check whether fault code exists.

Yes >> check、maintenance the harness connected with parking ECU assembly. Please see “Electric sub-manual - grounding and loop”

No >> finish diagnosis

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Fault of parking executive mechanical driving circuit

C11A011、C11A311、C11A07E、C11A37E、C11A07D、C11A37D、C11A063、C11A363

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of ECU assembly is damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Replace parking ECU assembly, please see “Remove and installation”

5     Execute zero position learning of parking ECU assembly; do self-diagnosis to check whether fault code exists.

Yes >> check、maintenance the harness connected with parking ECU assembly. Please see “Electric sub-manual - grounding and loop”

No >> finish diagnosis

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Fault of parking actuator C11A418、C11A477、C11A07C、C11A37C、C11A013、C11A313、C11A070、C11A370、C11A015、C11A315、C11A054、C11A354

 

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of parking mechanical is damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Check whether the assembly of friction plate is abnormal or excessive wear.

Yes>> assembly again or replace. Next step.

No>> Next step

4Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

5     check、maintenance the harness connected executive mechanical with parking ECU assembly. Please see “Electric sub-manual - grounding and loop”

Yes>>replace the fault rear brake caliper assembly. Please see “brake system-rear brake caliper assembly-remove and installation”. Next step.

No >> finish diagnosis

6          do self-diagnosis to check whether fault code exists.

Yes>>replace parking ECU assembly. Please see “remove and installation”

No >> finish diagnosis

7          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Switch fault C113800、C113861、C11352A、C11362A、C110860、C110862 EPB

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Change EPB switch ,do self-diagnosis to check whether fault code exists.

Yes>> next step

No >> finish diagnosis

5          Replace parking ECU assembly, please see “ remove and installation”

6     Start zero position  learning of parking ECU assembly,do self-diagnosis to check whether fault code exists.

Yes>> check、maintenance the harness connected EPB switch with parking ECU assembly. Please see “Electric sub-manual - grounding and loop”

No >> finish diagnosis

7          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

System electrical supplying fault U100016、U100017

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of parking ECU assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3     Put power on switch on shift “ON”, check whether the voltage of 12V battery is abnormal.Please see “Electric sub-manual - grounding and loop”.

Yes>>replace 12V battery. Please see “Electric sub-manual - grounding and loop”. Next step.

No>> Next step

4          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

5          Check grounding circuit of parking ECU assembly

①         Put the power on switch in the shift “LOCK”.

②    Pull out he connectors of parking ECU assembly, check whether the corresponding stitch at harness end of stitch28 and stitch30 are unobstructed.

Yes>> next step

No >> circuit fault of parking ECU, maintenance or replacement. Please see“Electric sub-manual - grounding and loop”.

6          Check electrical supplying circuit of parking ECU assembly

check whether the voltage between corresponding stitch at harness end of stitch13 and stitch15 and ground are normal.

Yes>> next step

No >> circuit fault of parking ECU, maintenance or replacement. Please see“Electric sub-manual - grounding and loop”.

Caution：

    perform self-diagnosis and clear fault codes after grounding or power supply circuit breakdown maintenance,and confirm whether the fault has been exempted. If fault unwinding, please continue to conduct diagnosis.

7     Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

8          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Hard line signal fault of power-on switch  C110116

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of parking ECU assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4     Check grounding circuit of parking ECU assembly

①    Put the key in the shift “LOCK”.

②    Pull out he connectors of parking ECU assembly, check whether the corresponding stitch at harness end of stitch28 and stitch30 are unobstructed.

Yes>> next step

No >> grounding fault, maintenance or replacement. Please see“Electric sub-manual - grounding and loop”.

5          Check electrical supplying circuit of parking ECU assembly

①    check whether the voltage between corresponding stitch at harness end of stitch22 and ground is zero.

②    Put the power on switch in shift “ON” to check whether the voltage between corresponding stitch at harness end of stitch22 and ground is normal.

Yes>> next step

No >> power on switch signal fault, maintenance or replacement. Please see“Electric sub-manual - grounding and loop”.

Caution：

    Perform self-diagnosis and clear fault codes after grounding or power supply circuit breakdown maintenance,and confirm whether the fault has been exempted. If fault unwinding, please continue to conduct diagnosis.

6     Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

7          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

 

Communication fault U010187、U040286

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Check whether VCU has fault.Please see“Electric sub-manual - grounding and loop”.

Yes>>check and repair VCU. Please see“Electric sub-manual - grounding and loop”.

No>> next step

5     Check CAN communication sub-line of EPB system is normal.Please see“Electric sub-manual - CAN communication system”.

Yes>>Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

No>> repair or replace fault parts. Please see“Electric sub-manual - CAN communication system”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Communication fault with PCU  U010087、U040186

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Check whether PCU has fault.Please see“Electric sub-manual - driving system of electrical vehicle”.

Yes>>check and repair PCU. Please see“Electric sub-manual - driving system of electrical vehicle”.

No >>next step

5     Check CAN communication sub-line of EPB system is normal.Please see“Electric sub-manual - CAN communication system”.

Yes>>Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

No>> repair or replace fault parts. Please see“Electric sub-manual - CAN communication system”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Communication fault with ABS U012987、U048186

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Check whether ABS has fault.Please see“Electric sub-manual - brake control system”.

Yes>>check and repair ABS.Please see“Electric sub-manual - brake control system”.

No >>next step

5     Check CAN communication sub-line of EPB system is normal.Please see“Electric sub-manual - CAN communication system”.

Yes>>Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

No>> repair or replace fault parts. Please see“Electric sub-manual - CAN communication system”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Communication fault U014087、U042286

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Check whether there is fault in ICM. Please see“Electric sub-manual - combination instrument”.

Yes>> Check and repair ICM. Please see“Electric sub-manual - combination instrument”.

No>> next step

5     Check CAN communication sub-line of EPB system is normal.Please see“Electric sub-manual - CAN communication system”.

Yes>>Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

No>> repair or replace fault parts. Please see“Electric sub-manual - CAN communication system”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Communication fault with AC controller U0112687、U042886

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Check whether AC controller has fault.Please see“Electric sub-manual - AC controller”.

Yes>>check and repair.Please see“Electric sub-manual - AC controller”.

No >>next step

5     Check CAN communication sub-line of EPB system is normal.Please see“Electric sub-manual - CAN communication system”.

Yes>>Replace parking ECU assembly, please see “Remove and installation”. Do the zero position learning of parking ECU assembly.

No>> repair or replace fault parts. Please see“Electric sub-manual - CAN communication system”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

CAN communication fault  U007388、U000188

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4     Check whether CAN communication system has fault.Please see“Electric sub-manual - CAN communication system”.

Yes>>check and repair.Please see“Electric sub-manual - CAN communication system”.

No >>next step

5     check and repair connecting harness of parking ECU assembly. Please see“Electric sub-manual - grounding and loop”.

6          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Zero positioning unlearning of parking ECU assembly

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Do the zero position learning of parking ECU assembly.

Fault of EPB switch status C11D12、C11D14 EPB

1          Preparation work

If carried out the other fault diagnosis before, please put the key in the "LOCK" block, check again after waiting for at least 10 s.

2          Check whether pins and wiring harness connector of EPB controller assembly are damaged or loosen.

Yes>> repair or replace. Next step.

No>> Next step

3          Perform self-diagnosis

①         Delete fault code

②         Put the key on "LOCK" block, waiting for more than 10 s.

③         Put the key on "ON" block.

④         Pull up and press down EPB switch separately once time.

⑤         Check whether fault code exists.

Yes>> next step

No >> finish diagnosis

4          Change EPB switch, do self diagnosis process to check whether there still have fault code.

Yes>> next step

No >> finish diagnosis

5          Replace parking ECU assembly, please see “Remove and installation”.

6     Do the zero position learning of parking ECU assembly.do self diagnosis process to check whether there still have fault code.

Yes>> check、repair the harness connecting EPB switch and parking ECU assembly. Please see “Electric sub-manual - grounding and loop”.

No >> finish diagnosis

7          Take action on self-diagnosis and delete old fault code after finishing diagnosis.

Common symptom and analysis

Press down EPB switch, parking couldn’t be released

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>check and maintenance of fault.Next step.

No>> Turn to 3

2          Check symptoms

Check whether parking could be released when pressing down EPB switch.

Yes>> diagnosis finish

No>> Next step

3     check the brake light switch and connecting harness on the brake pedal. Please see “Chassis sub-manual- brake system” and “Electric sub-manual - grounding and loop”

Yes>> repair or replace fault parts, turn to 2.

No>> Next step

4          Harness check

Check whether the positive and negative of harness of rear brake caliper assembly and parking ECU assembly is opposite. Please see “Electric sub-manual - grounding and loop”

Yes>> repair or replace harness.

NO >>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

Pulling up EPB switch, vehicle couldn’t be parking

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>check and maintenance of fault.Next step.

No>> Turn to 3

2          Check symptoms

Check whether parking could be done when pulling up EPB switch.

Yes>> diagnosis finish

No>> Next step

3          Harness check

Check whether the positive and negative of harness of rear brake caliper assembly and parking ECU assembly is opposite. Please see “Electric sub-manual - grounding and loop”

Yes>> repair or replace harness.

NO >>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

No way to enter into automatic parking model

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>Fault code、circuit fault diagnosis.Next step.

No>> Turn to 3

2          Check symptoms

Check whether it couldenter into automatic parking model.

Yes>> diagnosis finish

No>> Next step

3          check whether the light for safty belt untightening or door unlock is on.

Yes >> check and repair according to signal track. Please see “electrical sub-manual-combination instrument”

No>> Next step

3     Replace AUTOHOLD switch, check whether it could enter and exit the automatic parking model.

Yes>> diagnosis finish

No>>check and repair connecting harness for AUTOHOLD switch and parking ECU assembly.

4          Check symptoms

Check whether it could enter and exit the automatic parking model.

Yes>> diagnosis finish

No>>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

No way to exit automatic parking model

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>Fault code、circuit fault diagnosis.Next step.

No>> Turn to 3

2          Check symptoms

Check whether it could enter into or exit automatic parking model.

Yes>> diagnosis finish

No>> Next step

3     Replace AUTOHOLD switch, check whether it could enter and exit the automatic parking model.

Yes>> diagnosis finish

No>>check and repair connecting harness for AUTOHOLD switch and parking ECU assembly.

4          Check symptoms

Check whether it could enter and exit the automatic parking model.

Yes>> diagnosis finish

No>>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

Without start auxiliary function

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>Fault code、circuit fault diagnosis.Next step.

No>> Turn to 3

2          Check symptoms

Check whether it has start auxiliary function.

Yes>> diagnosis finish

No>> Next step

3          check whether the light for safty belt untightening or door unlock is on.

Yes >> check and repair according to signal track. Please see “electrical sub-manual-combination instrument”

No>> Next step

4          Check symptoms

Check whether it could enter and exit the automatic parking model.

Yes>> diagnosis finish

No>>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

Vehicles slope in the parking ramp

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>Fault code、circuit fault diagnosis.Next step.

No>> Turn to 3

2          Check symptoms

Check whether the function for anti-slope is normal.

Yes>> diagnosis finish

No>> Next step

3     Check whether the friction plate of rear brake caliper is over worn or equippeddnotwell. Please see “Chassis submanual- brake system”

Yes>>replace or equipped friction plate again.

No>> Next step

4          Check symptoms

Check whether the function for anti-slope is normal.

Yes>> diagnosis finish

No>>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

Driving up EPB switch, rear wheel lockup

1          Carry out self-diagnosis, check whether self-diagnosis result has fault code.

Yes >>Fault code、circuit fault diagnosis.Next step.

No>> Turn to 3

2          Check symptoms

Check whether the fault is deleted.

Yes>> diagnosis finish

No>> Next step

3     Pull out the connectors in the left rear brake caliper; pull up EPB switch and checkwhether right rear brake caliper assembly clamp tightenly.

Yes>>replace parking ECU assembly; do zero position learning and delete old fault code after finishing diagnosis.

No>> Next step

4          Adujust connectors of left and right rear brake caliper assembly and fix thenagain.

 

 

Remove and installation

Parking ECU assembly

Explosion diagram

1Parking ECU assembly

2 Parking ECU bracket

 

Remove and installation

Remove

1          Put power-on switches on “OFF”block, start next operation.

2          Remove rear part assembly of vice instrument board.

3          Pull out connectors of parking ECU assembly
4     Remove two fixing nuts of parking ECU assembly and its bracket, take out parking ECU assembly. ●     Tightening torque: 9～11N·m
5     Remove two fixing bolts of parking ECU bracket, take out parking ECU bracket. ●     Tightening torque: 20～25N·m

Installation

Install in the opposite order of remove.