8 Chassis / 8.16 Parking Brake Control Device | PDF pages 2131-2164

8.16 Parking Brake Control Device

8.16.1 Specifications

8.16.1.1 Fastener Specifications

Range Of Torque

Fastener Specifications

Specifications

Foot Pounds of Torque (ft lbs)

The fixing bolt connecting the parking

solenoid valve assembly and the frame

103 +/- 7.5 (ft lbs)

M14

assembly

The fixing bolt connecting the parking

solenoid valve assembly and the

18.5 +/- 2 (ft lbs)

parking solenoid valve bracket

NG8 nut seat on the interface of the

7.5 - 12 (ft lbs)

M16

parking solenoid valve assembly

NG12 nut seat on the interface of the

7.5 - 12 (ft lbs)

M22

parking solenoid valve assembly

8.16.2 Decomposition Diagram

8.16.2.1 Decomposition Diagram

Parking Solenoid Valve Assy

Nut Seat Ng12

Hexagon Flange Lock Nut_All Metal

Parking Solenoid Valve Bracket

Washer Ng8

10.

Hexagon Flange Bolt

11.

Plug

Snap Ring NG8

12.

Hexagon Flange Bolt

Nut seat NG8

13.

Washer Ng12

Hexagon Flange Lock Nut_All Metal

Snap Ring Ng12

8.16.3 System Schematic Diagram

8.16.3.1 Electrical Schematic Diagram

Tractor EPB

Trailer EPB

8.16.4 Diagnostic Information and Steps

8.16.4.1 Diagnostic Description

Before diagnosing the malfunction of the parking brake control device, it is important to understand and familiarize oneself with

the working principle of the parking brake control device before starting the system diagnosis. This will help determine the correct

fault diagnosis steps in the event of a malfunction, and more importantly, it will help determine the situation described by the

customer belongs to normal operation. Any fault diagnosis of the parking brake control device should start with routine

inspection, guiding maintenance personnel to take the next logical step for fault diagnosis. Understanding and correctly using the

diagnostic process can shorten the diagnosis time and avoid misjudgment of faulty parts.

8.16.4.2 Routine Inspection

• Check for aftermarket devices that may affect the operation of the parking brake control system, ensuring that these devices do

not affect the operation of the parking brake control system.

• Check system components that are easily accessible or visible to ensure that there is no obvious damage or potential

malfunction.

8.16.4.3 List Of Diagnostic Trouble Codes (SPN, FMI)

EPB

Fault Description

SPN,FMI

Exclusion Method

ON power supply voltage is too high

13138,3

(greater than 32V)

ON supply voltage is too low (less than

13138,4

16V)

The EPB module assembly valve is

13138,5

powered off (normally powered)

The main valve voltage is higher than

15186,3

32V

The main valve voltage is lower than

15186,4

Refer to EPB Power Fault

16V

15186,5

The main valve is disconnected

The standby valve is disconnected

13650,5

ON the power supply is too high

14418,3

ON power The power supply is too low

14418,4

The power supply to the standby valve

13650,3

is too high

The power supply to the standby valve

13650,4

is too low

CAN packets are lost or delayed.

193,9

Procedure

4289,5

The CAN cable is disconnected

22465,19

The whole car CAN Busoff

Refer to EPB Communication Fault

The AutoDrive_ADCU message is lost

19393,9

19393,19

The AutoDrive_ADCU check error

19393,8

AutoDrive_ADCU Counter error

The AutoDrive_rADCU message is lost

19649,9

Fault Description

SPN,FMI

Exclusion Method

19649,19

The AutoDrive_rADCU check error

19649,8

AutoDrive_rADCU Counter error

19137,9

EPBC1_ADCU is lost

19137,19

EPBC1_ADCU check error

19137,8

EPBC1_ADCU Counter is incorrect

20161,9

EPBC1_rADCU is lost

20161,19

EPBC1_rADCU check error

20161,8

EPBC1_rADCU Counter is incorrect

Clutch signal is lost

15811,9

The clutch signal is invalid

20417,2

22721,19

Redundant CANbusoff

Packets required by EPB in the

195,9

redundant can are lost Procedure

The EPB module assembly valve body

14674,11

is faulty

The trailer independent brake solenoid

13906,3

valve shorted the power supply

Trailer independent brake solenoid

13906,6

valve short circuit to the ground

Trailer independent brake solenoid

13906,5

valve disconnected

The output of the parking pressure

23122,4

sensor is abnormal

The output of the parking pressure

23122,3

sensor is abnormal

135250,2

Tilt sensor fault

Refer to EPB Internal Fault

The parking solenoid is short circuiting

16722,3

the power supply

Parking solenoid to ground short circuit

16722,6

Parking solenoid valve disconnected

16722,5

Release solenoid valve short circuit to

16978,3

power supply

Release solenoid valve to ground short

16978,6

circuit

16978,5

Release solenoid valve disconnected

The trailer detects the short circuit of the

17234,3

solenoid valve to the power supply

Trailer detects short circuit of solenoid

17234,6

valve to ground

Fault Description

SPN,FMI

Exclusion Method

Trailer detection solenoid valve

17234,5

disconnected

The ECU failed to read the memory

21330,25

The ECU write memory is faulty.

21330,24

Procedure

Main valve electric relay cannot drive

12882,4

output

Backup valve electrical relay cannot

12626,4

drive output

Main valve electric relay cannot cut off

12882,3

output

The backup valve electrical relay cannot

12626,3

cut off the output

The EPB system is seriously faulty

34898,11

The EPB switch is faulty. Procedure

14418,11

The release end of the switch is short

17794,3

circuited

The release end of the switch is short

17794,6

circuited to the ground

17794,5

The switch release end is disconnected

Switch parking terminal electrical short

18050,3

circuit

Switch parking terminal to ground short

18050,6

circuit

The switch parking terminal is

18050,5

disconnected

The switching linearity is not

Refer to Right Central Control Switch -

18050,0

proportional

Electronic Parking Switch Fault

Switch card lag

18050,10

Switch missing

18050,2

Switch power supply exception

18306,5

The closing position of the parking

18562,4

switch is abnormal

Relieve abnormal switch closing

18818,3

position

Parking indicator light to electric short

19074,3

circuit

Parking indicator disconnected

19330,5

Hard line parking light disconnected

9603,5

Hard parking lights are short circuited

9603,3

Fault Description

SPN,FMI

Exclusion Method

The redundant hard cable of the parking

9859,5

switch is abnormal

Alleviates redundant switch hard line

10115,5

anomalies

The gear signal is lost

12995,9

Refer to EPB Reports GSM Related

Fault

The gear signal is invalid

12993,2

Throttle signal loss

13251,9

Torque signal loss

13507,9

The foot brake signal is missing

13763,9

Barometric signal loss

14019,9

HaltBrakeMode signal is lost

15299,9

The XBR signal is lost

15555,9

Invalid throttle signal

13249,2

Refer to EPB Reports VDC Related

Fault

Torque signal invalid

13505,2

The foot brake signal is invalid

13761,2

14017,2

Barometric failure

The HaltBrakeMode signal is invalid

15297,2

The XBR signal is invalid

15553,2

The vehicle ready signal is lost

16323,9

The vehicle ready signal is invalid

16321,2

The EBS system cannot respond to

26450,3

XBR requests

The EBS system cannot respond to

14162,3

temporary parking brake requests

Speed signal loss

14275,9

Speed signal loss

14531,9

Refer to EPB Reports EBS Related

14787,9

ABS wheel speed report lost

Fault

Speed signal invalid

14273,2

Invalid speed signal

14529,2

The ABS wheel speed signal is invalid

14785,2

Abnormal speed jump

8899,10

Excessive speed error

8899,26

Loss of seat belt signal

12739,9

Ready signal loss

15043,9

Refer to EPB Reports BDCU Related

Fault

Invalid seat belt sign

14737,2

Invalid Ready signal

15041,2

Gate signal loss

16067,9

Refer to EPB Reports DCM Related

Fault

Gate signal invalid

16065,2

Fault Description

SPN,FMI

Exclusion Method

The rear axle running pressure signal is

16579,9

lost

Refer to EPB Reports CDC Related

Fault

The rear axle running pressure signal is

16577,2

invalid

When the vehicle is braking, there is no

19026,1

air in the brake line

There is air in the brake line when the

19282,0

vehicle is not braking

Refer to Parking Pipeline Leakage Fault

The brake line is leaking

19538,10

Parking system inflation time out

18770,7

Parking system exhaust time out

22866,7

Parking pipe leakage rate is too large

19539,10

Parking status The parking pressure is

19027,1

too high

Refer to Abnormal Pressure In The

Parking Pipeline

Running status Parking pressure is too

19283,0

low

The left sensor is short-circuited to the

29009,6

ground

29009,3

The sensor on the left is short-circuited

The left sensor is disconnected.

Refer to Left ABS Sensor Fault

29009,5

Procedure

Missing tooth on left sensor

29009,7

The sensor gap on the left is too large

29009,1

The right sensor is short-circuited to the

33105,6

ground

The right sensor is short circuited

33105,3

Procedure

Refer to Right ABS Sensor Fault

The right sensor is disconnected

33105,5

Procedure

Missing tooth on right sensor

33105,7

The sensor gap on the right is too large

33105,1

8.16.4.4 EPB Power Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

ON power supply

1. Main battery

The voltage of pin 25 on the controller is higher than

voltage is too high

13138,3

2. Low voltage

32V for more than 5 seconds

(greater than 32V)

charging system

3. Wiring harness

ON supply voltage is

The voltage of pin 25 at the controller end is lower than

13138,4

4.Tractor EPB

too low (less than 16V)

16V for more than 5 seconds

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The EPB module

assembly valve is

Pin 25 on the controller does not detect the voltage for

13138,5

powered off (normally

more than 1 second

powered)

The main valve voltage

The input voltage of pin 25 at the controller end is

15186,3

is higher than 32V

higher than 32V for more than 5 seconds

The main valve voltage

The input voltage of pin 25 at the controller end is lower

15186,4

is lower than 16V

than 16V for more than 5 seconds

The main valve is

Pin 25 on the controller does not detect voltage for

15186,5

disconnected

more than 1 second

The standby valve is

Pin 9 on the controller does not detect voltage for more

13650,5

disconnected

than 1 second

The input voltage of pin 10 at the controller end is

ON the power supply

14418,3

higher than 32V for more than 5 seconds

is too high

ON power The power

The input voltage of pin 10 at the controller end is less

14418,4

supply is too low

than 16V for more than 5 seconds

The power supply to

The input voltage of pin 9 at the controller end is higher

the standby valve is

13650,3

than 32V for more than 5 seconds

too high

The power supply to

The input voltage of pin 9 at the controller end is lower

13650,4

the standby valve is

than 16V for more than 5 seconds

too low

2.Circuit Diagram

Smart Junction Box - Chassis

Right center control switch

Battery

IP21-1

IP21-10

IP21-8

IP21-7

IP21-21

IP21-24

IP21-6

C1-E

C5-D

Master EPB Hall 2 U011

Main EPB Hall 1 U012

EPB switch - U008

released normally U015

The primary EPB is

Main EPB parking is

EPB switch + U023

always open U014

indicator U003

Primary EPB

I1_IP_B

I1_B_IP

Main EPB Hall 1 U012

Master EPB Hall 2 U011

EPB switch + U023

Main EPB parking is

KL15 G5D

released normally U015

EPB switch - U008

The primary EPB is

Chassis CAN8

always open U014

B+ G2F

indicator U003

Primary EPB

I4_B_C

I4_C_B

Chassis CAN8_H TH08

Chassis CAN8_L TL08

Master EPB Hall 2 U011

Main EPB Hall 1 U012

Main EPB parking is

EPB switch + U023

released normally U015

The primary EPB is

indicator U003

Primary EPB

always open U014

EPB switch - U008

G06

ECU- Z67

C19-9

C19-25

C19-23

C19-3

C19-12

C19-11

C19-15

C19-14

C19-8

C19-19

C19-24

C19-20

Tractor EPB

3. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check if there are any other module power fault codes besides Tractor EPB?

Check the main battery. Refer to Inspection Of The Main Battery

– Yes:

Check the low-voltage charging system. Refer to DCDC1 Low-voltage Charging System Malfunction

Next step

– No:

Step 4:Check the Tractor EPB power supply and grounding harness.

Step 5:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 6:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 7:Clear and confirm SPN and FMI.

8.16.4.5 EPB Communication Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

CAN packets are lost

The CAN message is lost or the delay exceeds 3

193,9

or delayed. Procedure

seconds

The CAN line is disconnected and cannot receive or

The CAN cable is

4289,5

send packets

disconnected

The whole car CAN

EPB system CAN communication detects Bus off

22465,19

Busoff

The AutoDrive_ADCU

AutoDrive_ADCU message is lost, more than 500ms

19393,9

message is lost

The AutoDrive_ADCU

19393,19

AutoDrive_ADCU validation error

check error

AutoDrive_ADCU

19393,8

AutoDrive_ADCU Counter error

Counter error

The AutoDrive_rADCU

AutoDrive_rADCU message is lost, more than 500ms

19649,9

message is lost

1. Wiring harness

The AutoDrive_rADCU

19649,19

2.Tractor EPB

AutoDrive_rADCU validation error

check error

AutoDrive_rADCU

19649,8

AutoDrive_rADCU Counter error

Counter error

The EPBC1_ADCU packet is lost and exceeds 500ms

19137,9

EPBC1_ADCU is lost

EPBC1_ADCU check

19137,19

EPBC1_ADCU verification error

error

EPBC1_ADCU

19137,8

EPBC1_ADCU Counter error

Counter is incorrect

The EPBC1_rADCU packet is lost and exceeds 500ms

20161,9

EPBC1_rADCU is lost

EPBC1_rADCU check

20161,19

EPBC1_rADCU verification error

error

EPBC1_rADCU

20161,8

EPBC1_rADCU Counter error

Counter is incorrect

Clutch signal is lost

Clutch signal loss, more than 500ms

15811,9

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The clutch signal is

The clutch signal sends an invalid value

20417,2

invalid

22721,19

Redundant CANbusoff

EPB redundant CAN communication detects Bus off

Packets required by

Redundant CAN requires packet loss of more than 3s

195,9

EPB in the redundant

can are lost Procedure

2.Circuit Diagram

Smart Junction Box - Chassis

Right center control switch

Battery

IP21-1

IP21-10

IP21-8

IP21-7

IP21-21

IP21-24

IP21-6

C1-E

C5-D

Master EPB Hall 2 U011

Main EPB Hall 1 U012

EPB switch - U008

released normally U015

The primary EPB is

Main EPB parking is

EPB switch + U023

always open U014

indicator U003

Primary EPB

I1_IP_B

I1_B_IP

Main EPB Hall 1 U012

Master EPB Hall 2 U011

EPB switch + U023

Main EPB parking is

KL15 G5D

released normally U015

EPB switch - U008

The primary EPB is

Chassis CAN8

always open U014

B+ G2F

indicator U003

Primary EPB

I4_B_C

I4_C_B

Chassis CAN8_H TH08

Chassis CAN8_L TL08

Master EPB Hall 2 U011

Main EPB Hall 1 U012

Main EPB parking is

EPB switch + U023

released normally U015

The primary EPB is

indicator U003

Primary EPB

always open U014

EPB switch - U008

G06

ECU- Z67

C19-9

C19-25

C19-23

C19-3

C19-12

C19-11

C19-15

C19-14

C19-8

C19-19

C19-24

C19-20

Tractor EPB

3. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check the CAN8 bus communication harness. Refer to Inspection Of CAN8 Bus Network Integrity

Step 4:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 5:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 6:Clear and confirm SPN and FMI.

8.16.4.6 EPB Internal Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The EPB module

There is a failure inside the EPB module assembly for

assembly valve body is

14674,11

more than 1 second

faulty

The trailer

The trailer independent brake spool inside the module

independent brake

13906,3

assembly was shorted with the power supply (24V) for

solenoid valve shorted

more than 1 second

the power supply

Trailer independent

The trailer independent brake valve core inside the

brake solenoid valve

module assembly is short-connected to the ground, and

13906,6

short circuit to the

the trailer independent brake valve has been working

ground

for more than 1 second

Trailer independent

The trailer independent brake spool inside the module

13906,5

brake solenoid valve

assembly is not connected for more than 1 second

disconnected

The output of the

The output voltage of the parking pressure sensor

23122,4

parking pressure

inside the EPB module is less than 0.2V, more than 10s

sensor is abnormal

1.Tractor EPB

The output voltage of the parking pressure sensor

The output of the

23122,3

inside the EPB module is greater than 4.8V, more than

parking pressure

sensor is abnormal

10s

EPB module internal tilt sensor Angle output or output

135250,2

Tilt sensor fault

signal is abnormal

The parking solenoid

The parking solenoid valve spool pair inside the module

is short circuiting the

16722,3

assembly is shorted with the source (24V) for more than

power supply

1 second

the valve core of the parking solenoid valve inside the

Parking solenoid to

module assembly is short connected to the ground, and

16722,6

ground short circuit

the parking solenoid valve has been working for more

than 1 second

The parking solenoid valve spool inside the module

Parking solenoid valve

16722,5

assembly is not connected for more than 1 second

disconnected

Release solenoid

The module assembly internal release solenoid valve

valve short circuit to

16978,3

spool is shorted with the power supply (24V) for more

power supply

than 1 second

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

module assembly internal release solenoid valve spool

Release solenoid

and ground short, more than 1 second, release parking

16978,6

valve to ground short

solenoid valve has been working

circuit

The module assembly internal release solenoid valve

Release solenoid

16978,5

spool is not connected for more than 1 second

valve disconnected

The trailer detects the

The trailer detection spool inside the module assembly

short circuit of the

17234,3

is shorted with the power supply (24V) for more than 1

solenoid valve to the

second

power supply

The trailer detection valve spool inside the module

Trailer detects short

assembly is short connected to the ground, and the

circuit of solenoid

17234,6

trailer detection solenoid valve has been working for

valve to ground

more than 1 second

Trailer detection

The trailer detection spool inside the module assembly

17234,5

solenoid valve

is not connected for more than 1 second

disconnected

The ECU failed to read

The ECU failed to read memory

21330,25

the memory

The ECU write

The ECU failed to write to memory

21330,24

memory is faulty.

Procedure

The EPB system main valve electrical relay cannot

Main valve electric

drive output, the relay cannot pull, the main valve

relay cannot drive

12882,4

electrical disconnect, enable the standby valve power

output

Backup valve electrical

The EPB system standby valve electrical relay cannot

relay cannot drive

12626,4

drive output, the relay cannot pull

output

Main valve electric

Power-on self-test EPB system main valve electrical

relay cannot cut off

12882,3

relay can not cut off the output, the relay can not be

output

disconnected

The backup valve

Power-on self-test EPB system standby valve electric

electrical relay cannot

12626,3

relay can not cut off the output, the relay can not be

cut off the output

disconnected

The EPB system is

The EPB system has multiple failures, and the

34898,11

seriously faulty

electronically controlled parking system cannot be used

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 4:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 5:Clear and confirm SPN and FMI.

8.16.4.7 Right Central Control Switch - Electronic Parking Switch Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The EPB switch is

The EPB switch or connecting harness fails for more

14418,11

faulty. Procedure

than 3 seconds

The release end of the

The internal switch release terminal of the EPB switch

17794,3

switch is short

is short-circuited with the power supply (24V) for more

circuited

than 200ms

The release end of the

The internal switch release end of the EPB switch is

switch is short

17794,6

short-circuited with the ground for more than 200ms

circuited to the ground

The switch release

The internal switch release terminal of the EPB switch

17794,5

end is disconnected

is not connected for more than 200ms

The internal switch parking terminal of the EPB switch

Switch parking

18050,3

is shorted with the power supply (24V), more than

terminal electrical

200ms

short circuit

Switch parking

EPB switch internal switch parking terminal and ground

18050,6

terminal to ground

short, more than 200ms

1. Wiring harness

short circuit

2.Right central

The switch parking

The EPB switch internal switch parking terminal is not

control switch -

18050,5

terminal is

connected, more than 200ms

electronic parking

disconnected

switch

The switching linearity

The two routing voltages inside the EPB switch are

18050,0

3.Tractor EPB

is not proportional

disproportionate, exceeding 200ms

Switch card lag

18050,10

The EPB switch is stuck for more than 3s

Switch missing

The controller does not receive the EPB switch for more

18050,2

than 1s

Switch power supply

The EPB switch supply voltage is less than 16V or more

18306,5

exception

than 32V, more than 1s

The closing position of

Abnormal closing position of the parking switch, more

18562,4

the parking switch is

than 200ms

abnormal

Relieve abnormal

The closure position of the relief switch is abnormal,

18818,3

switch closing position

exceeding 200ms

Parking indicator light

Parking indicator shorted with power supply (24V),

19074,3

to electric short circuit

more than 200ms

Parking indicator

Parking indicator disconnected for more than 200ms

19330,5

disconnected

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Hard line parking light

The hard line of the parking P light is disconnected for

9603,5

disconnected

more than 2s

Hard parking lights are

A short circuit of more than 2s is detected in the hard

9603,3

short circuited

wire pair of the parking P-light

The redundant hard

Switch redundancy Hard line and switch message

9859,5

cable of the parking

status are inconsistent for more than 2 seconds

switch is abnormal

Alleviates redundant

Switch redundancy Hard line and switch message

10115,5

switch hard line

status are inconsistent for more than 2 seconds

anomalies

2.Circuit Diagram

Smart Junction Box - Chassis

Right center control switch

Battery

IP21-1

IP21-10

IP21-8

IP21-7

IP21-21

IP21-24

IP21-6

C1-E

C5-D

Master EPB Hall 2 U011

Main EPB Hall 1 U012

EPB switch - U008

released normally U015

The primary EPB is

Main EPB parking is

EPB switch + U023

always open U014

indicator U003

Primary EPB

I1_IP_B

I1_B_IP

Main EPB Hall 1 U012

Master EPB Hall 2 U011

EPB switch + U023

Main EPB parking is

KL15 G5D

released normally U015

EPB switch - U008

The primary EPB is

Chassis CAN8

always open U014

B+ G2F

indicator U003

Primary EPB

I4_B_C

I4_C_B

Chassis CAN8_H TH08

Chassis CAN8_L TL08

Master EPB Hall 2 U011

Main EPB Hall 1 U012

Main EPB parking is

EPB switch + U023

released normally U015

The primary EPB is

indicator U003

Primary EPB

always open U014

EPB switch - U008

G06

ECU- Z67

C19-9

C19-25

C19-23

C19-3

C19-12

C19-11

C19-15

C19-14

C19-8

C19-19

C19-24

C19-20

Tractor EPB

3. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check the wiring harness between the right central control switch - electronic parking switch and Tractor EPB.

Step 4:Check if the right central control switch group is normal?

Parking Switch Status

Switch Status

Turn off parking brake switch

Turn off the parking brake switch and turn on the parking release switch

The parking brake switch is turned on, and the parking release switch is

Turn on parking brake switch

turned off

Next step

– Yes:

Replace the right central control switch - electronic parking switch. Refer to Replacement Of The Right Central

– No:

Control Switch Group

Step 5:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 6:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 7:Clear and confirm SPN and FMI.

8.16.4.8 EPB Reports GSM Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The gear signal is lost

The gear signal is lost, more than 500ms

12995,9

1. Wiring harness

2. Shift switch

The gear signal is

The gear signal sends an invalid value

12993,2

3.Tractor EPB

invalid

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for GSM related fault codes?

Prioritize troubleshooting GSM related issues.

– Yes:

Next step

– No:

Step 4:Rewrite the configuration code for the gear shift switch, reload the software, and upgrade.

Step 5:Replace the gear shift switch. Refer to Replacement Of Combination Switch

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.9 EPB Reports VDC Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Throttle signal loss

Throttle signal is lost, more than 500ms

13251,9

Torque signal loss

loss of torque signal, over 500ms

13507,9

1. Wiring harness

2.VDC

The foot brake signal

The foot brake signal is lost, more than 500ms

13763,9

3.Tractor EPB

is missing

Barometric signal loss

Air pressure signal is lost for more than 5 seconds

14019,9

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

HaltBrakeMode signal

HaltBrakeMode signal loss, more than 500ms

15299,9

is lost

The XBR signal is lost

XBR signal loss, more than 500ms

15555,9

Invalid throttle signal

The throttle signal sends an invalid value

13249,2

Torque signal invalid

The torque signal sends an invalid value

13505,2

The foot brake signal

The foot brake signal sends an invalid value

13761,2

is invalid

Barometric failure

The air pressure signal sends an invalid value

14017,2

The HaltBrakeMode

The HaltBrakeMode signal sent an invalid value

15297,2

signal is invalid

The XBR signal is

The XBR signal sent an invalid value

15553,2

invalid

The vehicle ready

Vehicle high voltage ready signal loss, more than

16323,9

signal is lost

500ms

The vehicle ready

The high voltage ready signal of the vehicle sends an

16321,2

signal is invalid

invalid value

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for VDC related fault codes?

Prioritize troubleshooting VDC related faults.

– Yes:

Next step

– No:

Step 4:VDC rewrite configuration code, software reload, upgrade.

Step 5:Replace VDC.Refer to Replacement Of Vehicle Domain Controller Assembly

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.10 EPB Reports EBS Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

During emergency braking, the EPB sends a braking

The EBS system

request, and the EBS system does not respond to the

cannot respond to

26450,3

request within 1 second

XBR requests

1. Wiring harness

The EBS system

Configure for EBS to do stoppage situations When

2.EBS

cannot respond to

performing near-stop braking, the EPB sends a braking

14162,3

3.Tractor EPB

temporary parking

request, and the EBS system does not respond to the

brake requests

request within 1 second

Speed signal loss

The speed signal is lost, more than 500ms

14275,9

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Speed signal loss

Loss of speed signal, over 500ms

14531,9

ABS wheel speed

ABS wheel speed signal is lost, more than 500ms

14787,9

report lost

Speed signal invalid

The speed signal sends an invalid value

14273,2

Invalid speed signal

The speed signal sends an invalid value

14529,2

The ABS wheel speed

The ABS wheel speed signal sends an invalid value

14785,2

signal is invalid

Abnormal jump in the speed signal, deviation of more

Abnormal speed jump

8899,10

than 9 mph

Different types of speed signals deviate by more than 9

Excessive speed error

8899,26

mph for more than 20 seconds

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for EBS related fault codes?

Prioritize troubleshooting EBS related issues.

– Yes:

Next step

– No:

Step 4:EBS rewrite configuration code, software reload, upgrade.

Step 5:Replace EBS. Refer to Replacement Of EBS Controller Assembly

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.11 EPB Reports BDCU Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Loss of seat belt signal

Seat belt signal lost, more than 500ms

12739,9

1. Wiring harness

Ready signal loss

The Ready signal is lost, more than 500ms

15043,9

2.BDCU

Invalid seat belt sign

The seat belt signal sent an invalid value

14737,2

3.Tractor EPB

Invalid Ready signal

The Ready signal sends an invalid value

15041,2

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for BDCU related fault codes?

Prioritize troubleshooting BDCU related faults.

– Yes:

Next step

– No:

Step 4:BDCU rewrite configuration code, software reload, upgrade.

Step 5:Replace the BDCU. Refer to Replacement Of Body Domain Control Uint

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.12 EPB Reports DCM Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Gate signal loss

Door signal loss, more than 500ms

1. Wiring harness

16067,9

2.DCM

Gate signal invalid

The gate signal sends an invalid value

16065,2

3.Tractor EPB

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for DCM related fault codes?

Prioritize troubleshooting DCM related issues.

– Yes:

Next step

– No:

Step 4:DCM rewrite configuration code, software reload, upgrade.

Step 5:Replace DCM. Refer to Replacement Of DCM

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.13 EPB Reports CDC Related Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The rear axle running

The vehicle rear axle running pressure signal is lost,

16579,9

pressure signal is lost

more than 500ms

1. Wiring harness

2.CDC

The rear axle running

The vehicle running pressure signal sends an invalid

3.Tractor EPB

16577,2

pressure signal is

value

invalid

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check for CDC related fault codes?

Prioritize troubleshooting CDC related issues.

– Yes:

Next step

– No:

Step 4:CDC rewrites configuration codes, reloads software, and upgrades.

Step 5:Replace CDC.Refer to Replacement Of Cockpit Domain Controller

Step 6:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 7:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 8:Clear and confirm SPN and FMI.

8.16.4.14 Parking Pipeline Leakage Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

When the vehicle is

When the stop relay valve is working The pressure

19026,1

braking, there is no air

sensor detects that the pressure is less than 1bar and

in the brake line

more than 1s

At speeds greater than 3 mph After stepping on the

There is air in the

accelerator, the pressure sensor is monitored to monitor

brake line when the

19282,0

the driving air path, and the air pressure is always

vehicle is not braking

higher than 1bar for more than 10s

Near stop relay valve operation The pressure sensor

monitors the driving air route and detects frequent air

The brake line is

1. Braking

leakage in the pipeline, which fails to establish the

19538,10

leaking

system

pressure set at the stop after continuous working for 3

2.Tractor EPB

cycles

When the parking is released, the parking pressure for

Parking system

5 seconds is not more than 4.5bar, and the final

18770,7

inflation time out

pressure can be charged more than 6bar

Parking system

When parking, exhaust for 5 seconds parking pressure

22866,7

exhaust time out

is not less than 1bar

Release the parking vehicle, the speed is greater than 3

Parking pipe leakage

19539,10

mph, and the continuous air injection is more than 3

rate is too large

times

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check the braking system. Refer to Check The Braking System

Step 4:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 5:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 6:Clear and confirm SPN and FMI.

8.16.4.15 Abnormal Pressure In The Parking Pipeline

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

1. Wiring harness

Parking status The

In the parking state, the parking pressure is greater

2. Braking

parking pressure is too

than 1bar, more than 10 seconds, or the parking

19027,1

system

high

pressure is more than 2bar after 5s.

3.Tractor EPB

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

Running status

The speed is more than 3 mph, the parking pressure is

19283,0

Parking pressure is too

less than 5bar, more than 10 seconds

low

2. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection.Refer to Routine Inspection

Step 3:Check the braking system. Refer to Check The Braking System

Step 4:Check for brake pipeline leakage faults.

Step 5:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 6:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 7:Clear and confirm SPN and FMI.

8.16.4.16 Left ABS Sensor Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The left sensor is

The left wheel speed sensor of the EPB system was

short-circuited to the

29009,6

shorted with the ground wire for more than 1 second

ground

The left wheel speed sensor of the EPB system was

The sensor on the left

29009,3

short-circuited with the power supply (24V) for more

is short-circuited

1. Wiring harness

than 1 second

2.Left ABS

The left sensor is

The left wheel speed sensor of the EPB system was

sensor

29009,5

disconnected.

short-circuited with the power supply (24V) for more

3.Tractor EPB

Procedure

than 1 second

Missing tooth on left

The left wheel speed sensor of the EPB system lacks

29009,7

sensor

teeth

The sensor gap on the

Excessive clearance of the left wheel speed sensor of

29009,1

left is too large

the EPB system

2.Circuit Diagram

EBS X2

B70-2

B70-5

B70-1

B70-3

B70-6

B70-8

B70-4

B70-7

2M modulator CAN-L U201

2M modulator CAN-H U204

2M modulator + U203

2M modulator - U207

ESC Power Supply + U206

ESC Power Supply - U208

ESC-CANH U205

ESC-CANL U202

I5_B_C

I5_C_B

Solenoid power supply U203

2M modulator

CAN-L U201

CAN-H U204

I5_B_C

GND U207

I5_C_B

Axle modulator

C22-4

C22-3

C22-2

C22-1

X1 C21-8

C21-2

C21-7

Rear axle right wheel speed

Rear axle right wheel ABS

Rear axle left wheel speed

Private CAN-L U202

ESC-CAN-H U205

Rear axle left wheel ABS

Power source U206

sensor ground U608

sensor signal U607

sensor signal U601

Ground U208

sensor U602

C24-1

C24-2

C10-1

C10-2

C29-4

C29-3

C29-2

C29-1

Yaw rate sensor

Rear axle right wheel

Rear axle left wheel

ABS sensor

3. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check the left ABS sensor. Refer to Front Axle Left Wheel ABS Sensor Malfunction.Rear Axle Left Wheel ABS Sensor

Malfunction

Step 4:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 5:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 6:Clear and confirm SPN and FMI.

8.16.4.17 Right ABS Sensor Fault

1.SPN, FMI Monitoring Logic

Description

DTC Trigger Conditions

Faulty Part

SPN,FMI

The right sensor is

The right wheel speed sensor of the EPB system is

short-circuited to the

33105,6

short-circuited with the ground wire for more than 1

ground

second

The right sensor is

The right wheel speed sensor of the EPB system was

33105,3

short circuited

short-circuited with the power supply (24V) for more

1. Wiring harness

Procedure

than 1 second

2.Right ABS

The right sensor is

sensor

The right wheel speed sensor of the EPB system was

33105,5

disconnected

3.Tractor EPB

not connected for more than 1 second

Procedure

Missing tooth on right

The right wheel speed sensor of the EPB system lacks

33105,7

sensor

teeth

The sensor gap on the

Excessive clearance of the right wheel speed sensor of

33105,1

right is too large

the EPB system

2.Circuit Diagram

EBS X2

B70-2

B70-5

B70-1

B70-3

B70-6

B70-8

B70-4

B70-7

2M modulator CAN-L U201

2M modulator CAN-H U204

2M modulator + U203

2M modulator - U207

ESC Power Supply + U206

ESC Power Supply - U208

ESC-CANH U205

ESC-CANL U202

I5_B_C

I5_C_B

Solenoid power supply U203

2M modulator

CAN-L U201

CAN-H U204

I5_B_C

GND U207

I5_C_B

Axle modulator

C22-4

C22-3

C22-2

C22-1

X1 C21-8

C21-2

C21-7

Rear axle right wheel speed

Rear axle right wheel ABS

Rear axle left wheel speed

Private CAN-L U202

ESC-CAN-H U205

Rear axle left wheel ABS

Power source U206

sensor ground U608

sensor signal U607

sensor signal U601

Ground U208

sensor U602

C24-1

C24-2

C10-1

C10-2

C29-4

C29-3

C29-2

C29-1

Yaw rate sensor

Rear axle right wheel

Rear axle left wheel

ABS sensor

3. Diagnostic Steps

Step 1:Confirm that SPN and FMI are displayed correctly on the instrument screen.

Step 2:Routine inspection. Refer to Routine Inspection

Step 3:Check the ABS sensor on the right side. Refer to Front Axle Right Wheel ABS Sensor Malfunction.Rear Axle Right

Wheel ABS Sensor Malfunction

Step 4:Tractor EPB rewrite configuration code, software reload, upgrade.

Step 5:Replace the Tractor EPB. Refer to Replacement Of Parking Solenoid Valve Assembly

Step 6:Clear and confirm SPN and FMI.

8.16.5 Dismantling and Installation

8.16.5.1 Replacement of Parking Solenoid Valve Assembly

Valve Assembly

Removal Procedures

Release air pressure from the brake system.

Open the door.

Open the front flip cover plate.

Disconnect the battery negative cable.

caution

power down the high-voltage system before

disconnecting the negative pole of the storage

battery.

Disconnect 1 harness connector of the parking solenoid

valve assembly.

Disconnect 4 air pipes of the parking solenoid valve

assembly.

Remove 2 fixing nuts of the parking solenoid valve

assembly.

Remove the parking solenoid valve assembly.

Installation Procedures

Move the parking solenoid valve assembly to the

mounting position.

Install 2 fixing nuts of the parking solenoid valve assembly.

Torque: 18.5 +/- 2 (ft lbs)

Connect 4 air pipes of the parking solenoid valve

assembly.

Connect 1 harness connector of the parking solenoid

valve assembly.

caution

The harness is firmly connected following the

principal of "insert until a click is heard for

confirmation".

Connect the battery negative cable.

Close the front flip cover plate.

Close the door.

caution

After replacing the parking solenoid valve assembly,

it is necessary to connect a scan tool for flashing

and recalibrate the zero position.

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