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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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DTC INSPECTION [BCM]

CMDTC Self Test

1. Connect the M-MDS to the DLC-2.
2. Verify the following vehicle conditions:

  • All the switches are turned off (except the ignition switch).

  • All the doors, hood, and trunk are closed.

  • All the doors, and trunk are unlocked.

  • All the seat belts are unbuckled.

  • Parking brake lever is pulled.

3. 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”.
4. Verify the DTC according to the directions on the screen.

  • If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection after recording the snapshot data. (See DTC TABLE [BCM].)

5. After completion of repairs, clear all DTCs stored in the BCM. (See CLEARING DTC [BCM].)

ODDTC Self Test

1. Connect the M-MDS to the DLC-2.
2. Verify the following vehicle conditions:

  • All the switches are turned off (except the ignition switch).

  • All the doors, hood, and trunk are closed.

  • All the doors, and trunk are unlocked.

  • All the seat belts are unbuckled.

  • Parking brake lever is pulled.

3. 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 “BCM”.
4. Verify the DTC according to the directions on the screen.

  • If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection after recording the snapshot data. (See DTC TABLE [BCM].)

5. After completion of repairs, clear all DTCs stored in the BCM. (See CLEARING DTC [BCM].)

Snapshot Data

NOTE:

  • The BCM stores the following two types of snapshot data (vehicle information) when a DTC is detected and displays them in the M-MDS.

    • Vehicle information detected by BCM

    • Vehicle information detected by instrument cluster and received by BCM 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

—

—

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

—

—

IC_VPWR

V

Instrument cluster power supply voltage

  • The BCM receives the power supply voltage value of the instrument cluster sent via CAN communication from the instrument cluster.

  • If a DTC is detected, the BCM 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 (engine off or on)

NOTE:

  • The instrument cluster records the elapsed time since the ignition was switched ON (engine off or on).

  • The BCM 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 BCM 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 M-MDS.

—

PWR_MODE_KEY

Key Out/Key Recently Out (Position 0)/Accessory (Position 1)/Post Ignition (Position 2)/Ignition On (Position 2)/Running (Position 2)/Running - Starting

  • 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 (engine off or on)

  • Ignition On (Position 2): Ignition switched ON (engine off)

  • Running (Position 2): Ignition switched ON (engine on)

  • Running - Starting: Cranking condition

  • The BCM constantly receives the ignition switch status sent via CAN communication from the instrument cluster.

  • If a DTC is detected, the BCM records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.

—

RPM_STATUS

Engine Stop/Under1500rpm/Over1500rpm/FAIL

Engine speed status

  • The BCM constantly receives the engine speed sent via CAN communication from the instrument cluster.

  • If a DTC is detected, the BCM records the engine speed when the DTC was detected, and it is displayed in the M-MDS.

TACHOMTR*1

SHIFT_STATUS

P/N/D/R/FAIL

Selector lever position status

  • The BCM constantly receives the selector lever position sent via CAN communication from the instrument cluster.

  • If a DTC is detected, the BCM records the selector lever position when the DTC was detected, and it is displayed in the M-MDS.

—

TOTAL_DIST

km

Miles

Accumulated total traveled distance from completion of vehicle until BCM detects DTC (Odometer value in instrument cluster)

The total traveled distance from which the BCM detects DTCs to the present can be calculated by performing the following procedure.

  • Verify the odometer value in the instrument cluster.

  • Verify the snapshot data item TOTAL_DIST.

  • Subtract 2 from 1.

—

TOTAL_TIME

hh:mm:ss*2

Accumulated total elapsed time since vehicle completion until BCM 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 BCM detects DTCs to the present can be calculated by performing the following procedure.

  • Verify the instrument cluster PID item TOTAL_TIME.

  • Verify the snapshot data item TOTAL_TIME.

  • Subtract 2 from 1.

TOTAL_TIME*1

VPWR

V

BCM power supply voltage

—

VPWR

VSPD_STATUS

Stop/0-10km/h/Over10km/h/FAIL

Vehicle speed status

  • The BCM constantly receives the vehicle speed sent via CAN communication from the instrument cluster.

  • If a DTC is detected, the BCM records the vehicle speed when the DTC was detected, and it is displayed in the M-MDS.

SPEEDOMTR*1
*1
Instrument cluster PID (See PID/DATA MONITOR TABLE [INSTRUMENT CLUSTER].)
*2
The 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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