ON-BOARD DIAGNOSTIC [ELECTRIC PARKING BRAKE]

id040257555500


Outline

•  The on-board diagnostic function consists of the following functions:
―  A malfunction detection function, which detects overall malfunctions in the electric parking brake control module-related parts.
―  A memory function, which stores detected DTCs.
―  A display function, which indicates malfunction locations and status via DTC output.
―  A PID/data monitoring function, which reads out specific input/output signals and verifies the input/output condition.
•  Using the Mazda Modular Diagnostic System (M-MDS), DTCs can be read out and deleted, and the PID/data monitoring function can be activated.

Malfunction detection function

•  Detects malfunctions in input/output signals.
•  If a malfunction occurs, the electric parking brake control module records the malfunction as a DTC. A recorded DTC can be read by the Mazda Modular Diagnostic System (M-MDS).

DTC table

×: Applicable
—: Not applicable

DTC No.

Electric parking brake warning light

Description

Fail-safe

Drive cycle

Self test type*1

Memory function
C1020:68
ON
Error signal received from DSC HU/CM
×
—
C
×
C1128:01
ON
Electric parking brake switch circuit malfunction
×
—
C
×
C1128:0A
ON
Electric parking brake switch circuit malfunction
—
—
C
×
C1128:2A
ON
Electric parking brake switch circuit malfunction
×
—
C
×
C112A:77
ON
Incorrect electric parking brake motor gear unit position
—
—
C
×
C1139:12
—
AUTO HOLD switch circuit malfunction
—
—
C
×
C2005:01
ON
Electric parking brake motor gear unit (RH) circuit malfunction
—
—
C
×
C2005:07
ON
Mechanical problem of electric parking brake motor gear unit (RH)
—
—
C
×
C2005:0A
ON
Electric parking brake motor gear unit (RH) circuit malfunction
—
—
C
×
C2005:A2
ON
Electric parking brake control module low power supply voltage input
—
—
C
×
C2006:01
ON
Electric parking brake motor gear unit (LH) circuit malfunction
—
—
C
×
C2006:07
ON
Mechanical problem of electric parking brake motor gear unit (LH)
—
—
C
×
C2006:0A
ON
Electric parking brake motor gear unit (LH) circuit malfunction
—
—
C
×
C2006:A2
ON
Electric parking brake control module low power supply voltage input
—
—
C
×
U0001:87
ON
Unit communication error (HS-CAN)
—
—
C
×
U0001:88
ON
Unit communication error (HS-CAN)
—
—
C
×
U0100:00
ON
Communication error with PCM
—
—
C, D
×
U0101:00*2
ON
Communication error with TCM
—
—
C, D
×
U0121:00
ON
Communication error with DSC HU/CM
—
—
C, D
×
U0151:00
ON
Communication error with SAS control module
—
—
C, D
×
U0155:00
ON
Communication error with instrument cluster
—
—
C
×
U0401:00
ON
Error signal received from PCM
—
—
C, D
×
U0402:00*2
ON
Error signal received from TCM
—
—
C, D
×
U0415:00
ON
Error signal received from DSC HU/CM
—
—
C, D
×
U0423:00
ON
Error signal received from instrument cluster
—
—
C
×
U2300:54
ON
Configuration data not received from instrument cluster
—
—
C
×
U2300:55
ON
Instrument cluster configuration not implemented
—
—
C
×
U2300:56
ON
Configuration data unmatched with instrument cluster
—
—
C
×
U3000:04
ON
Electric parking brake control module internal malfunction
—
—
C
×
U3000:53
ON
Maintenance mode switching
—
—
C
×
U3000:54
ON
Electric parking brake motor gear unit position learning not completed
—
—
C
×
U3003:16
ON
Electric parking brake control module low power supply voltage input
—
—
C
×
U3003:17
ON
Electric parking brake control module high power supply voltage input
—
—
C
×
U3003:68
ON
Abnormal electric parking brake control module power supply
—
—
C
×
U300A:29
ON
Ignition switch status mismatch
—
—
C
×

*1  :C: CMDTC self test, D: ODDTC self test
*2  :ATX


DTC 7-digit code definition

•  When related systems or components have failed, the CM stores the DTC of the malfunctioning part in the CM memory, and allows for the retrieval of the store data using scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.
ac5wzn00001569


Status byte for DTC

•  The two digits (two digits after hyphen (-)) after the 7-digit DTC.
ac5wzn00002011
•  A code which indicates the pending code, current/past malfunction status, or warning illumination status.
•  Can be read by performing a CMDTC self-test using the Mazda Modular Diagnostic System (M-MDS).
•  For details on the status byte, refer to the explanation on the Mazda Modular Diagnostic System (M-MDS) when reading the DTC.


Detection condition for the applicable DTC

DTC No.

Description

Detection condition
C1020:68
Error signal received from DSC HU/CM
•  Electric parking brake control module receives the error signals from the DSC HU/CM after 5 s or more since ignition was switched ON (engine on).
C1128:01
Electric parking brake switch circuit malfunction
•  Electric parking brake control module detects an electric parking brake switch circuit malfunction.
C1128:0A
Electric parking brake switch circuit malfunction
•  Electric parking brake control module detects an electric parking brake switch circuit malfunction.
C1128:2A
Electric parking brake switch circuit malfunction
•  Electric parking brake control module detects that the signal in the electric parking brake switch circuit is stuck.
C112A:77
Incorrect electric parking brake motor gear unit position
•  Electric parking brake control module detects incorrect electric parking brake motor gear unit (LH) and (RH) positions.
C1139:12
AUTO HOLD switch circuit malfunction
•  Electric parking brake control module detects an AUTO HOLD switch circuit malfunction.
C2005:01
Electric parking brake motor gear unit (RH) circuit malfunction
•  Electric parking brake control module detects an electric parking motor gear unit (RH) circuit malfunction.
C2005:07
Mechanical problem of electric parking brake motor gear unit (RH)
•  Electric parking brake control module detects a mechanical problem of the electric parking brake motor gear unit (RH).
C2005:0A
Electric parking brake motor gear unit (RH) circuit malfunction
•  Electric parking brake control module detects that the current flowing to the electric parking brake motor gear unit (RH) circuit is lower than the threshold.
C2005:A2
Electric parking brake control module low power supply voltage input
•  Voltage of 9 V or less is detected in the power supply circuit (E terminal) of the electric parking brake control module.
C2006:01
Electric parking brake motor gear unit (LH) circuit malfunction
•  Electric parking brake control module detects an electric parking motor gear unit (LH) circuit malfunction.
C2006:07
Mechanical problem of electric parking brake motor gear unit (LH)
•  Electric parking brake control module detects a mechanical problem of the electric parking brake motor gear unit (LH).
C2006:0A
Electric parking brake motor gear unit (LH) circuit malfunction
•  Electric parking brake control module detects that the current flowing to the electric parking brake motor gear unit (LH) circuit is lower than the threshold.
C2006:A2
Electric parking brake control module low power supply voltage input
•  Voltage of 9 V or less is detected in the power supply circuit (A terminal) of the electric parking brake control module.
U0001:87
Unit communication error (HS-CAN)
•  Electric parking brake control module detects that a CAN signal is not received with the ignition switched ON (engine off or on).
U0001:88
Unit communication error (HS-CAN)
•  Electric parking brake control module detects the CAN bus communication line (HS-CAN) malfunction with the ignition switched ON (engine off or on).
U0100:00
Communication error with PCM
•  Electric parking brake control module could not receive the CAN signal from the PCM with the ignition switched ON (engine off or on).
U0101:00
Communication error with TCM
•  Electric parking brake control module could not receive the CAN signal from the TCM with the ignition switched ON (engine off or on).
U0121:00
Communication error with DSC HU/CM
•  Electric parking brake control module could not receive the CAN signal from the DSC HU/CM with the ignition switched ON (engine off or on).
U0151:00
Communication error with SAS control module
•  Electric parking brake control module could not receive the CAN signal from the SAS control module with the ignition switched ON (engine off or on).
U0155:00
Communication error with instrument cluster
•  Electric parking brake control module could not receive the CAN signal from the instrument cluster with the ignition switched ON (engine off or on).
U0401:00
Error signal received from PCM
•  Electric parking brake control module receives the error signals from the PCM with the ignition switched ON (engine off or on).
U0402:00
Error signal received from TCM
•  Electric parking brake control module receives the error signals from the TCM with the ignition switched ON (engine off or on).
U0415:00
Error signal received from DSC HU/CM
•  Electric parking brake control module receives the error signals from the DSC HU/CM with the ignition switched ON (engine off or on).
U0423:00
Error signal received from instrument cluster
•  Electric parking brake control module receives the error signals from the instrument cluster with the ignition switched ON (engine off or on).
U2300:54
Configuration data not received from instrument cluster
•  The electric parking brake control module cannot receive the configuration data from the instrument cluster with the ignition switched ON (engine off or on).
U2300:55
Instrument cluster configuration not implemented
•  Electric parking brake control module received a signal which indicates the instrument cluster configuration is not performed with the ignition switched ON (engine off or on).
U2300:56
Configuration data unmatched with instrument cluster
•  Configuration data of the electric parking brake control module and instrument cluster are not matched with the ignition switched ON (engine off or on).
U3000:04
Electric parking brake control module internal malfunction
•  Electric parking brake control module detects the internal malfunction.
U3000:53
Maintenance mode switching
•  Electric parking brake system switches to maintenance mode.
U3000:54
Electric parking brake motor gear unit position learning not completed
•  After replacing the electric brake control module, a condition in which the electric parking brake motor gear unit position learning has not been completed is detected.
U3003:16
Electric parking brake control module low power supply voltage input
•  Voltage of 9 V or less is detected in the power supply circuit of the electric parking brake control module.
U3003:17
Electric parking brake control module high power supply voltage input
•  Power supply voltage of 16 V or more is detected in the power supply circuit of the electric parking brake control module.
U3003:68
Abnormal electric parking brake control module power supply
•  The electric parking brake control module detected that the electric parking brake motor gear unit position is unknown.
U300A:29
Ignition switch status mismatch
•  Electric parking brake control module detects the following mismatches.
―  Condition of IG1 power supply supplied to instrument cluster
―  Condition of IG1 power supply supplied to electric parking brake control module


Snapshot data

Note
•  The electric parking brake control module stores the following two types of information when a DTC is detected and displays snapshot data in the Mazda Modular Diagnostic System (M-MDS).
―  Vehicle information detected by electric parking brake control module
―  Vehicle information detected by instrument cluster and received by electric parking brake control module via CAN communication
•  The data for all DTCs currently detected is stored.

—: Not applicable

Snapshot data item

Unit

Data contents

Data read/use method

Corresponding data monitor items
AAT
°C
°F
Ambient temperature
—
—
ACT_POS_L
-/Applied/Applying/RELEASED/Releasing/Maintenance Mode
Electric parking brake motor gear unit (LH) status
—
•  ACT_L_APPLY
•  ACT_L_REL
•  ACT_MAINTE
ACT_POS_R
-/Applied/Applying/RELEASED/Releasing/Maintenance Mode
Electric parking brake motor gear unit (RH) status
—
•  ACT_R_APPLY
•  ACT_R_REL
•  ACT_MAINTE
APP_STATUS
Accelerator Pedal Off/Under20%/Over20%/FAIL
Accelerator pedal position status
—
—
CFG_STATUS
Config Complete/Not Configured/Config Error
Instrument cluster configuration status
—
—
ECT_STATUS
Under 0 degrees C/0 - Under 80 degrees C/Over 80 degrees C/FAIL
Engine coolant temperature status
—
—
EPB_SW
Neutral/Apply/Release/Error
Electric parking brake switch input status
—
EPB_SW
IC_VPWR
V
Instrument cluster power supply voltage
•  The electric parking brake control module constantly receives the power supply voltage value of the instrument cluster sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the power supply voltage of the instrument cluster when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
VPWR*1
IG-ON_TIMER
hh:mm:ss*2
Elapsed time since ignition was switched ON (engine off or on)
Note
•  The instrument cluster records the elapsed time since the ignition was switched ON (engine off or on).
•  The electric parking brake control module constantly receives the elapsed time since the ignition was switched ON (engine off or on) sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the elapsed time since the ignition was switched ON (engine off or on) when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
—
PWR_MODE_KEY
Key Out/Key Recently Out/Key Approved (Position 0)/Post Accessory (Position 0)/Accessory (Position 1)/Post Ignition (Position 1)/ignition On (Position 2)/Running (Position 2)/Running - Starting In Progr
Ignition switch status
•  The electric parking brake control module constantly receives the ignition switch status sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the ignition switch status when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
—
RPM_STATUS
Engine Stop/Under1500rpm/Over1500rpm/FAIL
Engine speed status
•  The electric parking brake control module constantly receives the engine speed sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the engine speed when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
TACHOMTR*1
SHIFT_STATUS
P/N/D/R/FAIL
Selector lever position (ATX)/shift lever position (MTX) status
•  The electric parking brake control module constantly receives the selector lever position (ATX)/shift lever position (MTX) sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the selector lever position (ATX)/shift lever position (MTX) when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
—
TOTAL_DIST
km
ft, mi
Accumulated total traveled distance from completion of vehicle until electric parking brake control module detects DTC (Odometer value in instrument cluster)
The total traveled distance from which the electric parking brake control module detects DTCs to the present can be calculated by performing the following procedure.
1.  Verify the odometer value in the instrument cluster.
2.  Verify the snapshot data item TOTAL_DIST.
3.  Subtract 2 from 1.
—
TOTAL_TIME
hh:mm:ss*2
Accumulated total elapsed time since vehicle completion until electric parking brake control module detects a DTC
Note
•  When the ROOM fuse is removed, and the ignition is switched off, the time is not included in the elapsed time.
The elapsed time from which the electric parking brake control module detects DTCs to the present can be calculated by performing the following procedure.
1.  Verify the instrument cluster PID item TOTAL_TIME.
2.  Verify the snapshot data item TOTAL_TIME.
3.  Subtract 2 from 1.
TOTAL_TIME*1
VPWR
V
Electric parking brake control module power supply voltage
—
VPWR
VSPD
KPH
MPH
Vehicle speed
—
—
VSPD_STATUS
Stop/0-10km/h/Over10km/h/FAIL
Vehicle speed status
•  The electric parking brake control module constantly receives the vehicle speed sent via CAN communication from the instrument cluster.
•  If a DTC is detected, the electric parking brake control module records the vehicle speed when the DTC was detected, and it is displayed in the Mazda Modular Diagnostic System (M-MDS).
SPEEDOMTR*1

*1  :Instrument cluster PID (See ON-BOARD DIAGNOSTIC [INSTRUMENT CLUSTER].)
*2  :The seconds may be indicated after the decimal point.


Data Monitor Function

•  With the PID/data monitor function, the input/output signal monitor items set in the electric parking brake control module can be selected and read out in real-time.
•  The items which can be selected are as follows.

PID/data monitor table

Monitor item

Unit/Operation

Test condition

Specification (Reference)

Mazda Modular Diagnostic System (M-MDS) display
ACT_L_APPLY
Applied/Applying
Electric parking brake is applied
Applied
Electric parking brake is applying while electric parking brake switch is pulled up
Applying
ACT_L_REL
Released/Releasing
Electric parking brake is released
Released
Electric parking brake is releasing while electric parking brake switch is pushed down
Releasing
ACT_MAINTE
Off/Right_On/Left_On/On
Not maintenance mode
Off
Maintenance mode
On
ACT_R_APPLY
Applied/Applying
Electric parking brake is applied
Applied
Electric parking brake is applying while electric parking brake switch is pulled up
Applying
ACT_R_REL
Released/Releasing
Electric parking brake is released
Released
Electric parking brake is releasing while electric parking brake switch is pushed down
Releasing
BRK_TEMP_LR
°C, °F
Rear caliper (LH) temperature is displayed
BRK_TEMP_RR
°C, °F
Rear caliper (RH) temperature is displayed
EPB_SW
Neutral/Apply/Release/Error
Electric parking brake switch is in neutral position
Neutral
Electric parking brake switch is pulled up
Apply
Electric parking brake switch is pushed down
Release
MOTOR_L
A
Electric parking brake motor gear unit (LH) is operating
1—20 A
MOTOR_R
A
Electric parking brake motor gear unit (RH) is operating
1—20 A
VPWR
V
This PID indicates power supply voltage for electric parking brake control module.
VSPD
KPH, MPH
This PID indicates vehicle speed.