ON-BOARD DIAGNOSTIC SYSTEM [ANTILOCK BRAKE SYSTEM (ABS)]

id0402b0181300


OUTLINE

•  The on-board diagnostic system consists of a malfunction detection system that detects malfunctions in input/output signals when the ignition is switched ON, a PID/data monitor function that reads out specified input/output signals, and an active command mode function that allows for override operation of output parts (such as solenoid valves).
•  The data link connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis and detecting/repair into a single location, has been adopted, thereby improving serviceability. Diagnosis is performed by connecting the Mazda modular diagnostic system (M-MDS) to the DLC-2.
•  In addition to DTC read-out, the Mazda modular diagnostic system (M-MDS) is used to clear DTCs using the display screen of the diagnostic tester, and to access the PID/data monitor and active command modes functions, providing enhanced malfunction diagnosis and improved serviceability.

Block diagram

am3zzn00004737

FUNCTION


Malfunction detection function

•  The malfunction detection function detects and displays malfunctions in the input/output signal system of the ABS HU/CM when the ignition is switched ON.
•  When the ABS HU/CM is activated, the following malfunction detection is performed.
―  The ABS warning light and brake system warning light illuminate for approx. 3.0 s when the ignition is switched ON to inspect for open circuits in the lights. At the same time, the input/output signals of each part are monitored for malfunction diagnosis. After starting to drive, the first time the vehicle speed is approx. 10 km/h {6.2 mph} or more the pump motor is operated and malfunction diagnosis is performed again. The input/output signals of each part are then constantly monitored and malfunctions are diagnosed.
Note
•  The sound of the pump motor operation can be heard.
•  If the above malfunctions are detected, the corresponding lights are illuminated to alert the driver. DTCs can be output through the CAN_H and CAN_L of the DLC-2 using the external tester communication function. At the same time, malfunction detection results are sent to the memory and fail-safe functions.


Memory function

•  The memory function stores DTCs of malfunctions in input/output signal systems. With this function, once a DTC is stored it is not cleared after the ignition has been switched off, even if the malfunctioning signal system has returned to normal.
•  Since the ABS HU/CM has a built-in non-volatile memory, DTCs are not cleared even if the battery is removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the Workshop Manual for the DTC clearing procedure.


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 stored data using the scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.
am3zzn00004217


Fail-safe function

•  When the malfunction detection function determines a malfunction, the warning indicator light illuminates to alert the driver. At this time, the fail-safe function controls as indicated in the fail-safe function malfunction contents table.
Warning
•  If EBD control is prohibited, the rear wheels could lock-up before the front wheels. If this occurs, the vehicle could yaw and become unstable. Therefore, always inspect the system immediately if EBD control is prohibited.

DTC Table

×: Applicable
—: Not applicable

DTC No.

ABS warning light

Brake system warning light (when parking brake is released)

Malfunction location

Fail-safe

Drive cycle

Self test type*1

Memory function
C0010:01
Illuminated
Illuminated
ABS HU/CM internal malfunction (solenoid valve system)
×
Not applicable
C, D
×
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11
Illuminated
Not illuminated
Pump motor, motor relay
×
Not applicable
C, D
×
C0020:12
C0020:13
C0020:71
C0030:07
Illuminated
Not illuminated*2
LF ABS sensor rotor
×
Not applicable
C, D
×
C0031:11
Illuminated
Not illuminated*2
LF ABS wheel-speed sensor
×
Not applicable
C, D
×
C0031:15
C0031:29
Illuminated
Not illuminated*2
LF ABS wheel-speed sensor/ABS sensor rotor
×
Not applicable
C, D
×
C0031:2F
C0031:64
C0033:07
Illuminated
Not illuminated*2
RF ABS sensor rotor
×
Not applicable
C, D
×
C0034:11
Illuminated
Not illuminated*2
RF ABS wheel-speed sensor
×
Not applicable
C, D
×
C0034:15
C0034:29
Illuminated
Not illuminated*2
RF ABS wheel-speed sensor/ABS sensor rotor
×
Not applicable
C, D
×
C0034:2F
C0034:64
C0036:07
Illuminated
Not illuminated*2
LR ABS sensor rotor
×
Not applicable
C, D
×
C0037:11
Illuminated
Not illuminated*2
LR ABS wheel-speed sensor
×
Not applicable
C, D
×
C0037:15
C0037:29
Illuminated
Not illuminated*2
LR ABS wheel-speed sensor/ABS sensor rotor
×
Not applicable
C, D
×
C0037:2F
C0037:64
C0039:07
Illuminated
Not illuminated*2
RR ABS sensor rotor
×
Not applicable
C, D
×
C003A:11
Illuminated
Not illuminated*2
RR ABS wheel-speed sensor
×
Not applicable
C, D
×
C003A:15
C003A:29
Illuminated
Not illuminated*2
RR ABS wheel-speed sensor/ABS sensor rotor
×
Not applicable
C, D
×
C003A:2F
C003A:64
C0040:64
Not illuminated
Not illuminated
Brake switch
—
Not applicable
C, D
×
C0061:54
Not illuminated
Not illuminated
ABS HU/CM system (unperformed initialization procedure)
—
Not applicable
C, D
×
C0062:28
Not illuminated
Not illuminated
SAS control module system
—
Not applicable
C, D
×
C0062:54
Not illuminated
Not illuminated
ABS HU/CM system (unperformed initialization procedure)
—
Not applicable
C, D
×
C0062:64
Not illuminated
Not illuminated
SAS control module system
—
Not applicable
C, D
×
C0062:76
Not illuminated
Not illuminated
—
Not applicable
C, D
×
U0001:88
Not illuminated
Not illuminated
CAN line
—
Not applicable
C, D
×
U0100:00
Not illuminated
Not illuminated
U0151:00
Not illuminated
Not illuminated
U0155:00
Not illuminated
Not illuminated
U0452:86
Not illuminated
Not illuminated
Abnormal message from SAS control module
—
Not applicable
C, D
×
U3000:49
Not illuminated
Not illuminated
ABS HU/CM (internal malfunction)
—
Not applicable
C, D
×
U3003:16
Illuminated
Not illuminated*3
Power supply system
×
Not applicable
C, D
×
Illuminated*4*5
U3003:17
Illuminated
Illuminated

*1  :C: CMDTC self-test, D: ODDTC self-test
*2  :Illuminates when two wheels or more have a malfunction.
*3  :When power supply voltage is 7.9—9.6 V for 700 ms or more.
*4  :When power supply voltage is 6.0—7.9 V for 780 ms or more.
*5  :When power supply voltage is less than 6 V for 50 ms or more.

Fail-safe Function Malfunction Contents

DTC No.

Fail-safe function

Control status

ABS control

EBD control
C0010:01
Control disabled
Control disabled
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11
Control disabled
Control enabled
C0020:12
C0020:13
C0020:71
C0030:07
Control disabled
Control enabled*1
C0031:11
Control disabled
Control enabled*1
C0031:15
C0031:29
Control disabled
Control enabled*1
C0031:2F
C0031:64
C0033:07
Control disabled
Control enabled*1
C0034:11
Control disabled
Control enabled*1
C0034:15
C0034:29
Control disabled
Control enabled*1
C0034:2F
C0034:64
C0036:07
Control disabled
Control enabled*1
C0037:11
Control disabled
Control enabled*1
C0037:15
C0037:29
Control disabled
Control enabled*1
C0037:2F
C0037:64
C0039:07
Control disabled
Control enabled*1
C003A:11
Control disabled
Control enabled*1
C003A:15
C003A:29
Control disabled
Control enabled*1
C003A:2F
C003A:64
C0040:64
Control enabled
Control enabled
C0061:54
Control enabled
Control enabled
C0062:28
Control enabled
Control enabled
C0062:54
Control enabled
Control enabled
C0062:64
Control enabled
Control enabled
C0062:76
U0001:88
Control enabled
Control enabled
U0100:00
U0151:00
U0155:00
U0452:86
Control enabled
Control enabled
U3000:49
Control enabled
Control enabled
U3003:16
Control disabled
Control enabled*2
Control disabled*3*4
U3003:17
Control disabled
Control disabled

*1  :Control disabled when two wheels or more have a malfunction.
*2  :When power supply voltage is 7.9—9.6 V for 700 ms or more.
*3  :When power supply voltage is 6.0—7.9 V for 780 ms or more.
*4  :When power supply voltage is less than 6 V for 50 ms or more.


Status byte for DTC

•  The status byte is the two-digit code (two digits after hyphen (-)) after the DTC.
am5ezn00002077
•  The status byte is a code which indicates the pending code, current/past malfunction status, or warning illumination status.
•  The status byte 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.


Snapshot data

Note
•  The ABS CM stores the following two types of information when a DTC is detected and displays snap shot data in the M-MDS.
―  Vehicle information detected by ABS CM
―  Vehicle information detected by instrument cluster and received by start stop unit via CAN signal
•  The snapshot data stores the currently detected DTC data

Snapshot data item

Unit

Data contents

Data read/use method

Corresponding data monitor items
AAT
°C, °F
Ambient air temperature
Not applicable.
Not applicable.
ABS
Inactive/
Active
Antilock braking system
Not applicable.
Not applicable.
APP_STATUS
Accelerator Pedal Off/
Under 20%/
Over 20%/
FAIL
Accelerator pedal position
Not applicable.
Not applicable.
AYC
Inactive/
Active
Active yaw control
Not applicable.
Not applicable.
BRK_F_P_R
Pa, psi
Brake fluid line hydraulic pressure (Raw Value)
BRK_F_P_R
BRK_F_P_R
BTCS
Inactive/
Active
Brake traction control system
Not applicable.
Not applicable.
CFG_STATUS
Config Complete/
Not Configured/
Config Error
Instrument cluster configuration status
Not applicable.
Not applicable.
ECT_STATUS
Under 0 degrees C/
0 - Under 80 degrees C/
Over 80 degrees C/
FAIL
Engine coolant temperature status
Not applicable.
Not applicable.
EDC
Inactive/
Active
Engine drag control
Not applicable.
Not applicable.
IC_VPWR
V
Instrument cluster power supply
•  The ABS HU/CM constantly receives the power supply voltage value of the instrument cluster sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the power supply voltage of the instrument cluster when the DTC was detected, and it is displayed in the M-MDS.
VPWR*2
IG-ON_TIMER
hh:mm:ss*1
Elapsed time since ignition was switched ON
Note
•  The instrument cluster records the elapsed time since the ignition was switched ON.
•  The ABS HU/CM constantly receives the elapsed time since the ignition was switched ON sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the elapsed time since the ignition was switched ON when the DTC was detected, and it is displayed in the M-MDS.
Not applicable.
LAT_ACCL_R
G
Lateral acceleration (Raw Value)
LAT_ACCL_R
LAT_ACCL_R
LON_ACCL_R
G
Longitudinal acceleration (Raw Value)
LON_ACCL_R
LON_ACCL_R
PMP_MT
Off/On
Pump motor
PMP_MT
PMP_MT
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 Progress (Position 2)/
Crank (Position 3)
•  Key Out: Ignition switched off
•  Key Recently Out (Position 0): Elapsed time within 3 s since ignition was switched off
•  Accessory (Position 1): Ignition is switched to ACC
•  Post Ignition (Position 2): Elapsed time within 3 s since ignition was switched ON
•  Ignition On (Position 2): Ignition switched ON (engine off)
•  Running (Position 2): Ignition switched ON (engine on)
•  Running - Starting: Cranking condition
•  The ABS HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.
Not applicable.
RPM_STATUS
Engine Stop/
Under 1500rpm/
Over 1500rpm/
FAIL
Engine RPM status
•  The ABS HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.
TACHOMTR*2
SHIFT_STATUS
P/N
D/
R/
FAIL
Shift position status
•  The ABS HU/CM constantly receives the selector lever position sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the selector lever position when the DTC was detected, and it is displayed in the M-MDS.
Not applicable.
STR_ANG_C
°
Steering wheel angle (Calculated Value)
STR_ANG_C
STR_ANG_C
TCS
Inactive/
Active
Traction control system
Not applicable.
Not applicable.
TOTAL_DIST
km, ft, mi
Accumulated total traveled distance from completion of vehicle until ABS HU/CM detects DTC (Odometer value in instrument cluster)
The distance traveled when the ABS HU/CM detected a DTC can be calculated by performing the following procedure.
1.  Verify the odometer value in the instrument cluster.
2.  Verify the snap shot data item TOTAL_DIST.
3.  Subtract 2 from 1.
Not applicable.
TOTAL_TIME
hh:mm:ss*1
Accumulated total elapsed time since vehicle completion until ABS HU/CM 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 when the ABS HU/CM detected a DTC can be calculated by performing the following procedure.
1.  Verify the PID item TOTAL_TIME of the instrument cluster.
2.  Verify the snap shot data item TOTAL_TIME.
3.  Subtract 2 from 1.
Not applicable.
VPWR
V
Power supply
VPWR_B_SOL
VPWR_B_SOL
VSPD
KPH, MPH
Vehicle speed
VSPD
VSPD
VSPD_STATUS
Stop/
0 - 10km/h/
Over 10km/h/
FAIL
When a DTC is detected, the ABS HU/CM receives the vehicle speed being detected by the instrument cluster via CAN signals and displays it in the M-MDS.
•  The ABS HU/CM constantly receives the vehicle speed sent via CAN signal from the instrument cluster.
•  If a DTC is detected, the ABS HU/CM records the vehicle speed when the DTC was detected, and it is displayed in the M-MDS.
SPEEDOMTR*2
YAW_RATE_R
°/S
Yaw Rate (Raw Value)
YAW_RATE_R
YAW_RATE_R

*1  :Fractions of seconds may be indicated after the decimal point.
*2  :Instrument cluster PID.


PID/data monitor function

•  The PID/data monitor function is used for optionally selecting input/output signal monitor items preset in the ABS HU/CM and reading them out in real-time.

PID/data monitor table

Mazda Modular Diagnostic System (M-MDS) display

Data contents

Unit/Operation (Mazda Modular Diagnostic System (M-MDS) display)
BRAKE_SW
Brake switch signal
Off/On
LAT_ACCL_C
lateral-G value (calculated Value)
G
LAT_ACCL_R
lateral-G value (raw Value)
LON_ACCL_C
longitudinal-G value (calculated Value)
G
LON_ACCL_R
longitudinal-G value (raw Value)
PMP_MT
Note
•  Displays in the M-MDS but it does not operate.
PMP_MT_SP
V_INLET_LF
LF inlet solenoid valve condition
Off/On
V_INLET_LR
LR inlet solenoid valve condition
V_INLET_RF
RF inlet solenoid valve condition
V_INLET_RR
RR inlet solenoid valve condition
V_OUTLET_LF
LF outlet solenoid valve condition
V_OUTLET_LR
LR outlet solenoid valve condition
V_OUTLET_RF
RF outlet solenoid valve condition
V_OUTLET_RR
RR outlet solenoid valve condition
VPWR_B_SOL
Module supply voltage
V
VSPD
Vehicle speed
KPH, MPH
WSPD_SEN_LF
LF ABS wheel-speed sensor signal
KPH, MPH
WSPD_SEN_LR
LR ABS wheel-speed sensor signal
WSPD_SEN_RF
RF ABS wheel-speed sensor signal
WSPD_SEN_RR
RR ABS wheel-speed sensor signal
YAW_RATE_C
Yaw rate value (calculated Value)
°/s
YAW_RATE_R
Yaw rate value (raw Value)


Active command modes function

•  The active command modes function is used for optionally selecting simulation items of input/output parts preset in the ABS HU/CM, and to operate them regardless of CM control.
•  To protect the hydraulic unit interior, operate output related parts for only 2 s or less when using the active command modes function.

Active command mode table

Command name

Output part

Operation

Operating condition
PMP_MT_SP
Pump motor
Off/On
Switch the ignition ON
V_INLET_LF
LF inlet solenoid valve
V_INLET_LR
LR inlet solenoid valve
V_INLET_RF
RF inlet solenoid valve
V_INLET_RR
RR inlet solenoid valve
V_OUTLET_LF
LF outlet solenoid valve
V_OUTLET_LR
LR outlet solenoid valve
V_OUTLET_RF
RF outlet solenoid valve
V_OUTLET_RR
RR outlet solenoid valve


External tester communication function

•  The external tester communication function enables communication of diagnostic data (DTC read-outs, input/output signal read-outs, operation of input/output parts) between the ABS HU/CM and an external tester.

Connections/communication contents

External tester

Mazda Modular Diagnostic System (M-MDS)

Connection

Communication method
On-board diagnostic (malfunction detection) function
Input/output: CAN_H (HS), CAN_L (HS) terminals
Serial communication
PID/data monitor function
Input/output: CAN_H (HS), CAN_L (HS) terminals
Serial communication
Active command modes function
Input/output: CAN_H (HS), CAN_L (HS) terminals
Serial communication

Serial communication
•  Serial communication (two-way communication) allows for multiple data to be sent and received instantly along the same line.
•  By connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2, diagnostic data can be sent and received between the Mazda Modular Diagnostic System (M-MDS) and the ABS HU/CM using the CAN_H and CAN_L terminals (within the DLC-2).
•  The ABS HU/CM receives the command signals of the malfunction detection function, PID/data monitor function, and the active command modes function based on the Mazda Modular Diagnostic System (M-MDS), and sends DTCs and data regarding the operating condition and status of each input/output part to the Mazda Modular Diagnostic System (M-MDS).

Diagnostic function name

Signal received

Signal sent
Malfunction detection function
DTC verification signal
DTC
PID/data monitor function
Command signal to read selected monitor item
Monitored data for requested monitor item
Active command modes function
Operation command signal for selected active command modes item
Output part drive signal