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DTC INSPECTION [DSC HU/CM]

CMDTC self test

1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.
a. Select “Self Test”.
b. Select “All CMDTCs”.
3. Verify the DTC according to the directions on the screen.

  • If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection. (See DTC TABLE [DSC HU/CM].)

NOTE:

  • Snapshot data appears at the top of the help screen when the displayed DTC is selected.

  • Snapshot data stores the currently detected DTC data.

4. After completion of repairs, clear all DTCs stored in the module. (See CLEARING DTC [DSC HU/CM].)

ODDTC self test

1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.
a. Select “Self Test”.
b. Select “Modules”.
c. Select “ABS”.
3. Verify the DTC according to the directions on the screen.

  • If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection. (See DTC TABLE [DSC HU/CM].)

4. After completion of repairs, clear all DTCs stored in the module. (See CLEARING DTC [DSC HU/CM].)

Snapshot Data Table

NOTE:

  • The DSC HU/CM stores the following two types of information when a DTC is detected and displays snapshot data in the M-MDS

    • Vehicle information detected by DSC HU/CM

    • Vehicle information detected by instrument cluster and received via CAN communication

  • Refer to PID monitor table for confirm the DSC system operation status while the DSC HU/CM does not store the DTC. (See PID/DATA MONITOR TABLE [DSC HU/CM].)

  • Snapshot data items are not displayed, according to detected DTC.

—: 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

—

—

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.

—

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 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.

—

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.

—

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.

—

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*1

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.

—

VPWR

V

Power supply

—

VPWR_B_SOL

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.

—
*1
Fractions of seconds may be indicated after the decimal point
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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