ON-BOARD DIAGNOSTIC SYSTEM [DSC HU/CM]

id040262181300

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

am2zzn00003893

Function

Malfunction detection function

• The malfunction detection function detects malfunctions in the input/output signal system of the DSC HU/CM when the ignition switched ON or driving the vehicle.

• The DSC HU/CM performs the following malfunction detections:

― The ABS warning light, brake system warning light, TCS/DSC indicator light, DSC OFF indicator light, and Tire Pressure Monitoring System (TPMS) 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 DSC 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)	TCS/DSC indicator light	DSC OFF indicator light	Tire Pressure Monitoring System (TPMS) warning light^*1	Smart City Brake Support (SCBS) warning light (amber)^*2	Description	Fail-safe	Drive cycle	Self test type^*3	Memory function
B10DF:46	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Illuminates	DSC HU/CM internal malfunction	×	—	C, D	×
B11D4:08	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Laser sensor	×	—	C, D	×
C0001:01	Illuminates	Illuminates	Illuminates	Not illuminate	Not illuminate	Illuminates	DSC HU/CM internal malfunction (solenoid valve system)	×	—	C, D	×
C0002:01
C0003:01
C0004:01
C0010:01
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11	Illuminates	Not illuminate	Illuminates	Not illuminate	Not illuminate	Illuminates	Pump motor, motor relay	×	—	C, D	×
C0020:12
C0020:13
C0020:71
C0023:62	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Brake switch	×	—	C, D	×
C0030:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LF ABS sensor rotor	×	—	C, D	×
C0031:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LF ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0031:11	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LF ABS wheel-speed sensor	×	—	C, D	×
C0031:15	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LF ABS wheel-speed sensor	×	—	C, D	×
C0031:29	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LF ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0031:2F
C0031:64
C0033:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RF ABS sensor rotor	×	—	C, D	×
C0034:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RF ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0034:11	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RF ABS wheel-speed sensor	×	—	C, D	×
C0034:15	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RF ABS wheel-speed sensor	×	—	C, D	×
C0034:29	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RF ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0034:2F
C0034:64
C0036:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LR ABS sensor rotor	×	—	C, D	×
C0037:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LR ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0037:11	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LR ABS wheel-speed sensor	×	—	C, D	×
C0037:15	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LR ABS wheel-speed sensor	×	—	C, D	×
C0037:29	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	LR ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C0037:2F
C0037:64
C0039:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RR ABS sensor rotor	×	—	C, D	×
C003A:07	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RR ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C003A:11	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RR ABS wheel-speed sensor	×	—	C, D	×
C003A:15	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RR ABS wheel-speed sensor	×	—	C, D	×
C003A:29	Illuminates	Not illuminate^*4	Illuminates	Not illuminate	Illuminates	Illuminates	RR ABS wheel-speed sensor/ABS sensor rotor	×	—	C, D	×
C003A:2F
C003A:64
C0040:64	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	Brake switch	×	—	C, D	×
C0044:28	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates^*5	Illuminates^*5	Brake fluid pressure sensor	×	—	C, D	×
C0044:47
C0044:49
C0044:51
C0044:54	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates
C0044:64	Illuminates	Illuminates	Illuminates	Not illuminate	Illuminates	Illuminates
C0044:8F	Illuminates	Illuminates	Illuminates	Not illuminate	Illuminates	Illuminates
C0051:62	Illuminates	Illuminates	Illuminates	Not illuminate	Illuminates	Illuminates	EPS control module	×	—	C, D	×
C0051:64	Illuminates	Illuminates	Illuminates	Not illuminate	Illuminates	Illuminates
C0051:67	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Illuminates
C0051:85	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates
C0061:28	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	SAS control module	×	—	C, D	×
C0061:54	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM (unperformed initialization procedure)	×	—	C, D	×
C0061:64	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	SAS control module	×	—	C, D	×
C0062:28	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Not illuminate	SAS control module	×	—	C, D	×
C0062:54	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Not illuminate	DSC HU/CM (unperformed initialization procedure)	×	—	C, D	×
C0062:64	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Not illuminate	SAS control module	×	—	C, D	×
C0062:76	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Not illuminate	SAS control module	×	—	C, D	×
C0063:28	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	SAS control module	×	—	C, D	×
C0063:54	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM (unperformed initialization procedure)	×	—	C, D	×
C0063:64	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	SAS control module	×	—	C, D	×
C006B:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	TCS/DSC control	×	—	C, D	×
C0072:68	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	TCS/DSC control	×	—	C, D	×
C1031:35	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Not illuminate	Tire Pressure Monitoring System (TPMS) set switch	×	—	C, D	×
C1031:41	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Not illuminate	Tire Pressure Monitoring System (TPMS)	×	—	C, D	×
C1031:54
C1031:68
C1109:64	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	DSC OFF switch	—	—	C, D	×
C1A08:1C	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM internal malfunction	×	—	C, D	×
P0942:46	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM mismatched installation	×	—	C, D	×
P0942:49	Illuminates^*5	Illuminates^*5	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM mismatched installation	×	—	C, D	×
U0001:88	Illuminates	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	CAN line	×	—	C, D	×
U0100:00	Illuminates^*5	Not illuminate	Illuminates^*5	Not illuminate	Illuminates^*5	Illuminates^*5
U0101:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates
U0131:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates
U0151:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Illuminates^*5
U0155:00	Illuminates^*5	Not illuminate	Illuminates^*5	Not illuminate	Not illuminate	Illuminates^*5
U0235:00	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates
U0336:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Not illuminate	Signal error from SAS control module	×	—	C, D	×
U0401:00	Not illuminate	Not illuminate	Illuminates^*5	Not illuminate	Illuminates^*5	Illuminates^*5	Signal error from PCM	×	—	C, D	×
U0402:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	Signal error from transmission/transaxle	×	—	C, D	×
U0420:00	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	Signal error from EPS control module	×	—	C, D	×
U0423:00	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Illuminates	Signal error from instrument cluster	×	—	C, D	×
U0433:00	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Signal error from laser sensor	×	—	C, D	×
U0443:00	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Illuminates	Signal error from instrument cluster	×	—	C, D	×
U0452:86	Not illuminate	Not illuminate	Illuminates	Not illuminate	Illuminates^*5	Illuminates^*5	Signal error from SAS control module	×	—	C, D	×
U2007:46	Not illuminate	Not illuminate	Illuminates	Not illuminate	Not illuminate	Illuminates	DSC HU/CM internal malfunction	×	—	C, D	×
U2007:62	Illuminates	Illuminates	Illuminates	Not illuminate	Not illuminate	Illuminates	DSC HU/CM internal malfunction	×	—	C, D	×
U2101:00	Illuminates	Not illuminate	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM configuration	×	—	C, D	×
U2300:52
U2300:54
U2300:55
U2300:56
U2300:64
U3000:49	Illuminates	Illuminates^*5	Illuminates	Not illuminate	Illuminates	Illuminates	DSC HU/CM internal malfunction	×	—	C, D	×
U3003:08	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Not illuminate	Battery power supply	—	—	C, D	×
U3003:16	Illuminates	Not illuminate^*6	Illuminates	Not illuminate	Illuminates	Illuminates		×
U3003:16	Illuminates	Illuminates^78	Illuminates	Not illuminate	Illuminates	Illuminates
U3003:17	Illuminates	Illuminates	Illuminates	Not illuminate	Illuminates	Illuminates

*1 :With Tire Pressure Monitoring System (TPMS)

*2 :With Smart City Brake Support (SCBS)

*3 :C: CMDTC self test, D: ODDTC self test

*4 :Illuminates when two wheels or more have a malfunction

*5 :Not illuminate depending on malfunction content

*6 :When power supply voltage is 7.9—9.6 V for 0.7 s or more

*7 :When power supply voltage is 6.0—7.9 V for 0.8 s or more

*8 :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.

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• 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	TCS control		DSC control	Brake assist control	Vehicle roll prevention function control^*1	Hill Launch Assist (HLA) control	Tire pressure monitoring system (TPMS) control^*2	Smart City Brake Support (SCBS) control^*3	Secondary Collision Reduction (SCR) control^*3
DTC	ABS control	EBD control	Brake control	Engine control	DSC control	Brake assist control	Vehicle roll prevention function control^*1	Hill Launch Assist (HLA) control	Tire pressure monitoring system (TPMS) control^*2	Smart City Brake Support (SCBS) control^*3	Secondary Collision Reduction (SCR) control^*3
B10DF:46	×	×	—		—	—	—	—	×	—	—
B11D4:08	×	×	×		×	×	×	×	×	×	×
C0001:01	—	—	—		—	—	—	—	×	—	—
C0002:01
C0003:01
C0004:01
C0010:01
C0011:01
C0014:01
C0015:01
C0018:01
C0019:01
C001C:01
C001D:01
C0020:11	—	×	—		—	—	—	—	×	—	—
C0020:12
C0020:13
C0020:71
C0023:62	×	×	×		×	×	×	×	×	—	×
C0030:07	—	×^*4	—		—	—	—	—	—	—	—
C0031:07
C0031:11
C0031:15
C0031:29
C0031:2F
C0031:64
C0033:07	—	×^*4	—		—	—	—	—	—	—	—
C0034:07
C0034:11
C0034:15
C0034:29
C0034:2F
C0034:64
C0036:07	—	×^*4	—		—	—	—	—	—	—	—
C0037:07
C0037:11
C0037:15
C0037:29
C0037:2F
C0037:64
C0039:07	—	×^*4	—		—	—	—	—	—	—	—
C003A:07
C003A:11
C003A:15
C003A:29
C003A:2F
C003A:64
C0040:64	×	×	×		×	—	—	—	—	—	×
C0044:28	×	×	—^*5		—^*5	—	—^*5	—^*5	—^*5	—^*5	—^*5
C0044:47
C0044:49
C0044:51
C0044:54	×	×	—		—	—	—	—	—	—	—
C0044:64	×	×	—		—	—	—	—	—	—	—
C0044:8F	×	×	—		—	—	—	—	—	—	—
C0051:62	×	×	—		—	×	×	×	—	—	—
C0051:64	×	×	—		—	×	×	×	—	—	—
C0051:67	×	×	—		—	×	×	×	×	—	—
C0051:85	×	×	—		—	×	×	×	—	—	—
C0061:28	×	×	—		—	×	×	×	—	—	—
C0061:54	×	×	—		—	×	×	×	—	—	—
C0061:64	×	×	—		—	×	×	×	—	—	—
C0062:28	×	×	×		×	×	—	—	×	×	×
C0062:54
C0062:64
C0062:76
C0063:28	×	×	—		—	×	×	×	—	—	—
C0063:54	×	×	—		—	×	×	×	—	—	—
C0063:64	×	×	—		—	×	×	×	—	—	—
C006B:00	×	×	—		—	×	×	×	—	—	—
C0072:68	×	×	—	×	×	×	×	×	×	×	×
C1031:35	×	×	×		×	×	×	×	—	×	×
C1031:41
C1031:54
C1031:68
C1109:64	×	×	×		×	×	×	×	×	×	×
C1A08:1C	×	×	—		—	—	—	—	—	—	—
P0942:46	×	×	—		—	—	—	—	—	—	—
P0942:49	—^*5	—^*5	—		—	—	—	—	—	—	—
U0001:88	—	×	—		—	—	—	—	—	—	—
U0100:00	—^*5	×	—^*5		—^*5	—^*5	—^*5	—^*5	—^*5	—^*5	—^*5
U0101:00	×	×	—		—	×	—^*5	—^*5	—	—	—
U0131:00	×	×	—		—	×	×	×	—	—	—
U0151:00	×	×	—^*5		—^*5	—^*5	—^*5	—^*5	×	—^*5	—^*5
U0155:00	—^*5	×	—^*5		—^*5	—^*5	—^*5	—^*5	×	—^*5	—^*5
U0235:00	×	×	×		×	×	×	×	×	—	×
U0336:00	×	×	×		×	×	×	×	×	×	—
U0401:00	×	×	—^*5		—^*5	×	—^*5	—^*5	—^*5	—^*5	—^*5
U0402:00	×	×	—		—	×	—	—	—	—	—
U0420:00	×	×	—		—	×	×	×	—	—	—
U0423:00	×	×	×		×	×	×	×	—	—	×
U0433:00	×	×	×		×	×	×	×	×	—	×
U0443:00	×	×	×		×	×	×	×	×	—	×
U0452:86	×	×	—^*5		—^*5	×	—^*5	—^*5	—^*5	—^*5	—^*5
U2007:46	×	×	—		—	—^*5	—	—	×	—	—
U2007:62	—	—	—		—	—	—	—	×	—	—
U2101:00	—	×	—		—	—	—	—	—	—	—
U2300:52
U2300:54
U2300:55
U2300:56
U2300:64
U3000:49	—	—^*5	—		—	—	—	—	—	—	—
U3003:08	×	×	×		×	×	×	×	×	×	×
U3003:16	—	×^*6	—		—	—	—	—	—	—	—
U3003:16	—	—^78	—		—	—	—	—	—	—	—
U3003:17	—	—	—		—	—	—	—	—	—	—

*1 :ATX

*2 :With Tire Pressure Monitoring System (TPMS)

*3 :With Smart City Brake Support (SCBS)

*4 :Control disabled when two wheels or more have a malfunction

*5 :Enabled depending on malfunction content

*6 :When power supply voltage is 7.9—9.6 V for 0.7 s or more

*7 :When power supply voltage is 6.0—7.9 V for 0.8 s or more

*8 :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)	—	BRK_F_P_R
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	Inactive/Active	Engine drag control	—	—
IC_VPWR	V	Instrument cluster power supply	• The DSC 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 DSC 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 DSC 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 DSC 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 DSC HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster. • If a DTC is detected, the DSC 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 DSC HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster. • If a DTC is detected, the DSC 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 DSC HU/CM constantly receives the selector lever position sent via CAN signal from the instrument cluster. • If a DTC is detected, the DSC 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)	—	STR_ANG_C
TCS	Inactive/Active	Traction control system	—	—
TOTAL_DIST	km, ft, mi	Accumulated total traveled distance from completion of vehicle until DSC HU/CM detects DTC (Odometer value in instrument cluster)	The distance traveled when the DSC 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 DSC 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 DSC 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 DSC HU/CM constantly receives the vehicle speed sent via CAN signal from the instrument cluster. • If a DTC is detected, the DSC 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 DSC HU/CM and reading them out in real-time.

Monitor item (Mazda Modular Diagnostic System (M-MDS) display)

Definition

Unit/operation

BRAKE_SW

Brake switch signal

Off/On

BRK_F_P_C

Brake fluid pressure sensor signal (calculated value)

Pa, psi

BRK_F_P_R

Brake fluid pressure sensor signal (raw value)

DDS_MODE

Deflation detection system mode

Not_Learned/Learning/Learned

DSC_OFF_SW

DSC OFF switch signal

Off/On

DSC_ST

DSC status

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)

P_BRAKE_SW

Parking brake switch signal

Off/On

PMP_MT

Note

•  Displays in the M-MDS but it does not operate.

PMP_MT_SP

R_GEAR_SW

Shift lever signal (R position)

Off/On

STR_ANG_C

Steering wheel angle (calculated value)

°

STR_ANG_R

Steering wheel angle (raw value)

TPMS_TYPE

Tire Pressure Monitoring System (TPMS) type

No_DDS/DDS/DDS+TOM_O/DDS+TOM_EU/DDS+TOM_US

V_INLET_LF

LF inlet solenoid valve status

Off/On

V_INLET_LR

LR inlet solenoid valve status

V_INLET_RF

RF inlet solenoid valve status

V_INLET_RR

RR inlet solenoid valve status

V_OUTLET_LF

LF outlet solenoid valve status

V_OUTLET_LR

LR outlet solenoid valve status

V_OUTLET_RF

RF outlet solenoid valve status

V_OUTLET_RR

RR outlet solenoid valve status

V_STB_LF/RR

Note

•  Displays in the M-MDS but it does not operate.

V_STB_RF/LR

V_TRC_LF/RR

Note

•  Displays in the M-MDS but it does not operate.

V_TRC_RF/LR

VPWR_B_SOL

Power supply

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)

Monitor item (Mazda Modular Diagnostic System (M-MDS) display)	Definition	Unit/operation
BRAKE_SW	Brake switch signal	Off/On
BRK_F_P_C	Brake fluid pressure sensor signal (calculated value)	Pa, psi
BRK_F_P_R	Brake fluid pressure sensor signal (raw value)
DDS_MODE	Deflation detection system mode	Not_Learned/Learning/Learned
DSC_OFF_SW	DSC OFF switch signal	Off/On
DSC_ST	DSC status	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)
P_BRAKE_SW	Parking brake switch signal	Off/On
PMP_MT	Note • Displays in the M-MDS but it does not operate.
PMP_MT_SP
R_GEAR_SW	Shift lever signal (R position)	Off/On
STR_ANG_C	Steering wheel angle (calculated value)	°
STR_ANG_R	Steering wheel angle (raw value)
TPMS_TYPE	Tire Pressure Monitoring System (TPMS) type	No_DDS/DDS/DDS+TOM_O/DDS+TOM_EU/DDS+TOM_US
V_INLET_LF	LF inlet solenoid valve status	Off/On
V_INLET_LR	LR inlet solenoid valve status
V_INLET_RF	RF inlet solenoid valve status
V_INLET_RR	RR inlet solenoid valve status
V_OUTLET_LF	LF outlet solenoid valve status
V_OUTLET_LR	LR outlet solenoid valve status
V_OUTLET_RF	RF outlet solenoid valve status
V_OUTLET_RR	RR outlet solenoid valve status
V_STB_LF/RR	Note • Displays in the M-MDS but it does not operate.
V_STB_RF/LR
V_TRC_LF/RR	Note • Displays in the M-MDS but it does not operate.
V_TRC_RF/LR
VPWR_B_SOL	Power supply	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)

Simulation function

• The simulation function is used for optionally selecting simulation items of input/output parts preset in the DSC 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

V_STB_LF/RR

LF/RR stability control solenoid valve

Off/On

Switch the ignition ON

V_STB_RF/LR

RF/LR stability control solenoid valve

V_TRC_LF/RR

LF/RR linear control solenoid valve

Off/On

Switch the ignition ON

V_TRC_RF/LR

RF/LR linear control solenoid valve

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
V_STB_LF/RR	LF/RR stability control solenoid valve	Off/On	Switch the ignition ON
V_STB_RF/LR	RF/LR stability control solenoid valve
V_TRC_LF/RR	LF/RR linear control solenoid valve	Off/On	Switch the ignition ON
V_TRC_RF/LR	RF/LR linear control 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 DSC 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 DSC HU/CM via CAN lines.

• The DSC 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

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