ON-BOARD DIAGNOSTIC SYSTEM [ABS HU/CM]


id040260181300


Outline

•  The on-board diagnostic system consists of the following functions:
―  A malfunction detection function that detects abnormalities in input/output signals when the ignition switch is at the ON position.
―  A PID/data monitor function that reads out specified input/output signals.
―  A simulation 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 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) has following functions:
―  PID/data monitor access
―  DTC clear using the display screen of the diagnostic tester

Block diagram

am2zzn00002655

Function


Malfunction detection function

•  The malfunction detection function detects malfunctions in the input/output signal system of the ABS HU/CM when the ignition switched ON or driving the vehicle.
•  The ABS HU/CM performs the following malfunction detections:
―  The ABS warning light and brake system warning light illuminate for approx. 3.0 s when the ignition is switched ON. 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.


Malfunction display function

•  When the malfunction detection function detects a malfunction, the corresponding lights illuminate to alert the driver.
•  Using the external tester communication function, DTCs can be output to the DLC-2 via the CAN line. At the same time, malfunction detection results are sent to the memory function and fail-safe function.


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 switch 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 table

×: Applicable
—: Not applicable

DTC

ABS warning light

Brake system warning light (when parking brake is released)

Description

Fail-safe

Drive cycle

Self test type*1

Memory function

C0010:01
Illuminates
Illuminates
ABS HU/CM internal malfunction (solenoid valve system)
×
C, D
×
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11
Illuminates
Not illuminate
Pump motor, motor relay
×
C, D
×
C0020:12
C0020:13
C0020:71
C0030:07
Illuminates
Not illuminate*2
LF ABS sensor rotor
×
C, D
×
C0031:07
LF ABS wheel-speed sensor/ABS sensor rotor
C0031:11
Illuminates
Not illuminate*2
LF ABS wheel-speed sensor
×
C, D
×
C0031:15
C0031:29
Illuminates
Not illuminate*2
LF ABS wheel-speed sensor/ABS sensor rotor
×
C, D
×
C0031:2F
C0031:64
C0033:07
Illuminates
Not illuminate*2
RF ABS sensor rotor
×
C, D
×
C0034:07
RF ABS wheel-speed sensor/ABS sensor rotor
C0034:11
Illuminates
Not illuminate*2
RF ABS wheel-speed sensor
×
C, D
×
C0034:15
C0034:29
Illuminates
Not illuminate*2
RF ABS wheel-speed sensor/ABS sensor rotor
×
C, D
×
C0034:2F
C0034:64
C0036:07
Illuminates
Not illuminate*2
LR ABS sensor rotor
×
C, D
×
C0037:07
LR ABS wheel-speed sensor/ABS sensor rotor
C0037:11
Illuminates
Not illuminate*2
LR ABS wheel-speed sensor
×
C, D
×
C0037:15
C0037:29
Illuminates
Not illuminate*2
LR ABS wheel-speed sensor/ABS sensor rotor
×
C, D
×
C0037:2F
C0037:64
C0039:07
Illuminates
Not illuminate*2
RR ABS sensor rotor
×
C, D
×
C003A:07
RR ABS wheel-speed sensor/ABS sensor rotor
C003A:11
Illuminates
Not illuminate*2
RR ABS wheel-speed sensor
×
C, D
×
C003A:15
C003A:29
Illuminates
Not illuminate*2
RR ABS wheel-speed sensor/ABS sensor rotor
×
C, D
×
C003A:2F
C003A:64
C0040:64
Not illuminate
Not illuminate
Brake switch
×
C, D
×
C0061:54
Not illuminate
Not illuminate
ABS HU/CM (unperformed initialization procedure)
×
C, D
×
C0062:28
Not illuminate
Not illuminate
SAS control module
×
C, D
×
C0062:54
Not illuminate
Not illuminate
ABS HU/CM (unperformed initialization procedure)
×
C, D
×
C0062:64
Not illuminate
Not illuminate
SAS control module
×
C, D
×
C0062:76
Not illuminate
Not illuminate
SAS control module
×
C, D
×
U0001:88
Illuminates
Not illuminate
CAN line
×
C, D
×
U0100:00
Illuminates*3
Not illuminate
U0101:00
Not illuminate
Not illuminate
U0151:00
Not illuminate
Not illuminate
U0155:00
Illuminates*3
Not illuminate
U0401:00
Not illuminate
Not illuminate
Signal error from PCM
×
C, D
×
U0402:00
Not illuminate
Not illuminate
Signal error from transmission/transaxle
×
C, D
×
U0423:00
Not illuminate
Not illuminate
Signal error from instrument cluster
×
C, D
×
U0452:86
Not illuminate
Not illuminate
Signal error from SAS control module
×
C, D
×
U2101:00
Illuminates
Not illuminate
ABS HU/CM configuration
×
C, D
×
U2300:52
U2300:54
U2300:55
U2300:56
U2300:64
U3000:49
Illuminates
Illuminates*3
ABS HU/CM internal malfunction
×
C, D
×
U3003:16
Illuminates
Not illuminate*4
Battery power supply
×
C, D
×
Illuminates*5*6
U3003:17
Illuminates
Illuminates

*1  :C: CMDTC self test, D: ODDTC self test
*2  :Illuminates when two wheels or more have a malfunction
*3  :Not illuminate depending on malfunction content
*4  :When power supply voltage is 8.4—9.6 V for 0.7 s or more
*5  :When power supply voltage is 6.0—8.4 V for 0.8 s or more
*6  :When power supply voltage is 6 V or less for 0.05 s or more


Status byte for DTC

•  The status byte is the two-digit code (two digits after hyphen (-)) after the seven-digit DTC.
am2zzn00002656
•  The status byte is a code which indicates the pending code, current/past malfunction status, or warning illumination status.
•  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 M-MDS when reading the DTC.


Fail-safe function

•  When the malfunction detection function determines a malfunction, the corresponding lights illuminates to alert the driver. At this time, the fail-safe function controls as indicated in the fail-safe function 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.

Fail-safe function table

×: Control enabled
—: Control disabled

DTC

ABS control

EBD control

C0010:01
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11
×
C0020:12
C0020:13
C0020:71
C0030:07
×*1
C0031:07
C0031:11
C0031:15
C0031:29
C0031:2F
C0031:64
C0033:07
×*1
C0034:07
C0034:11
C0034:15
C0034:29
C0034:2F
C0034:64
C0036:07
×*1
C0037:07
C0037:11
C0037:15
C0037:29
C0037:2F
C0037:64
C0039:07
×*1
C003A:07
C003A:11
C003A:15
C003A:29
C003A:2F
C003A:64
C0040:64
×
×
C0061:54
×
×
C0062:28
×
×
C0062:54
C0062:64
C0062:76
U0001:88
×
U0100:00
*2
×
U0101:00
×
×
U0151:00
×
×
U0155:00
*2
×
U0401:00
×
×
U0402:00
×
×
U0423:00
×
×
U0452:86
×
×
U2101:00
×
U2300:52
U2300:54
U2300:55
U2300:56
U2300:64
U3000:49
*2
U3003:16
×*3
*4*5
U3003:17

*1  :Control disabled when two wheels or more have a malfunction
*2  :Enabled depending on malfunction content
*3  :When power supply voltage is 8.4—9.6 V for 0.7 s or more
*4  :When power supply voltage is 6.0—8.4 V for 0.8 s or more
*5  :When power supply voltage is 6 V or less for 0.05 s or more


Snapshot data

•  The snapshot data stores the currently detected DTC data.

—: Not applicable

Snapshot data item

Unit

Definition

Data read/use method

Corresponding data monitor items

AAT
°C, °F
Ambient air temperature
ABS
Inactive/Active
Antilock braking system
APP_STATUS
Accelerator Pedal Off/
Under 20%/
Over 20%/
FAIL
Accelerator pedal position
AYC
Inactive/Active
Active yaw control
BRK_F_P_R
Pa, psi
Brake fluid line hydraulic pressure (raw value)
BTCS
Inactive/Active
Brake traction control system
CFG_STATUS
Config Complete/
Not Configured/
Config Error
Configuration status
ECT_STATUS
Under 0 degrees C/
0 - Under 80 degrees C/
Over 80 degrees C/
FAIL
Engine coolant temperature status
EDC#1
Inactive/Active
Engine drag control
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*1
IG-ON_TIMER
hh:mm:ss*2
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.
LAT_ACCL_R
G
Lateral acceleration (raw value)
LAT_ACCL_R
LON_ACCL_R
G
Longitudinal acceleration (raw value)
LON_ACCL_R
PMP_MT
Off/On
Pump motor
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.
RPM_STATUS
Engine Stop/
Under 1500 rpm/
Over 1500 rpm/
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*1
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.
STR_ANG_C
°
Steering wheel angle (calculated value)
TCS
Inactive/Active
Traction control system
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.
TOTAL_TIME
hh:mm:ss*2
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.
TOTAL_TIME*1
VPWR
V
Power supply
VPWR_B_SOL
VSPD
KPH, MPH
Vehicle speed
VSPD
VSPD_STATUS
Stop/
0 - 10 km/h/
Over 10 km/h/
FAIL
Vehicle speed status
•  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*1
YAW_RATE_R
°/s
Yaw rate (raw value)
YAW_RATE_R

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


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.

Monitor item

Unit/Operation

Test condition

Specification (Reference)

M-MDS display

BRAKE_SW
Off/On
Brake pedal released
Off
Brake pedal depressed
On
LAT_ACCL_R
(raw value)
G
Vehicle stopped or driving at constant speed
0 G
Cornering to left
Changes to 0 G—positive
Cornering to right
Changes to 0 G—negative
LON_ACCL_C
(calculated value)
G
Vehicle stopped or driving at constant speed
0 G
Cornering to left
Changes to 0 G—positive
Cornering to right
Changes to 0 G—negative
LON_ACCL_R
(raw value)
G
Vehicle stopped or driving at constant speed
0 G
Cornering to left
Changes to 0 G—positive
Cornering to right
Changes to 0 G—negative
P_BRAKE_SW
Off/On
Parking brake lever released
Off
Parking brake lever pulled
On
PMP_MT
Note
•  Displays in the M-MDS but it does not operate.
PMP_MT_SP
V_INLET_LF
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_INLET_LR
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_INLET_RF
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_INLET_RR
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_OUTLET_LF
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_OUTLET_LR
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_OUTLET_RF
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
V_OUTLET_RR
Off/On
Solenoid valve not activated
Off
Solenoid valve activated
On
VPWR_B_SOL
V
This PID indicates power supply voltage for ABS HU/CM.
VSPD
KPH, MPH
This PID indicates vehicle speed.
WSPD_SEN_LF
KPH, MPH
This PID indicates vehicle speed.
WSPD_SEN_LR
KPH, MPH
This PID indicates vehicle speed.
WSPD_SEN_RF
KPH, MPH
This PID indicates vehicle speed.
WSPD_SEN_RR
KPH, MPH
This PID indicates vehicle speed.
YAW_RATE_C
(calculated value)
°/s
Vehicle stopped or driving at constant speed
0 °/s
Cornering to left
Changes to 0 °/s—positive
Cornering to right
Changes to 0 °/s—negative
YAW_RATE_R
(raw value)
°/s
Vehicle stopped or driving at constant speed
0 °/s
Cornering to left
Changes to 0 °/s—positive
Cornering to right
Changes to 0 °/s—negative


Simulation function

•  The simulation 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 simulation function.

Simulation item

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.
•  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 via CAN lines.
•  The ABS HU/CM receives the command signals of the malfunction detection function, PID/data monitor function, and simulation function from the Mazda modular diagnostic system (M-MDS), and sends DTCs and data regarding the operating 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(s)
PID/data monitor function
Command signal to read selected monitor item
Monitored data for requested monitor item
Simulation function
Operation command signal for selected simulation item
Output part drive signal