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ON-BOARD DIAGNOSTIC SYSTEM [EVP CONTROL UNIT]

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.

  • 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

Function

Malfunction detection function

  • The malfunction detection function detects malfunctions in the input/output signal system of the EVP control unit when the ignition switched ON or driving the vehicle.

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 EVP control unit 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

Brake system warning light*1

Electric vacuum pump warning light

Description

Fail-safe

Drive cycle

Self test type*2

Memory function

C101A:00

Illuminated

Illuminated

Vacuum sensor

×

—

C, D

×

C101B:16

Not illuminated*3

Illuminated

Vacuum sensor 1

×

—

C, D

×

C101B:17

Not illuminated*3

Illuminated

Vacuum sensor 1

×

—

C, D

×

C101B:1C

Not illuminated*3

Illuminated

Vacuum sensor 1

×

—

C, D

×

C101C:00

Illuminated

Illuminated

Electric vacuum pump

×

—

C, D

×

C101C:18

Illuminated

Illuminated

Electric vacuum pump

×

—

C, D

×

C101C:71

Illuminated

Illuminated

Electric vacuum pump

×

—

C, D

×

C101C:72

Illuminated

Illuminated

Electric vacuum pump

×

—

C, D

×

C101C:73

Illuminated

Illuminated

Electric vacuum pump

×

—

C, D

×

C1035:11

Illuminated

Illuminated

Electric vacuum pump relay 1

×

—

C, D

×

C1035:12

Illuminated

Illuminated

Electric vacuum pump relay 1

×

—

C, D

×

C1035:13

Illuminated

Illuminated

Electric vacuum pump relay 1

×

—

C, D

×

C1036:11

Illuminated

Illuminated

Electric vacuum pump relay 2

×

—

C, D

×

C1036:12

Illuminated

Illuminated

Electric vacuum pump relay 2

×

—

C, D

×

C1036:13

Illuminated

Illuminated

Electric vacuum pump relay 2

×

—

C, D

×

P050F:00

Illuminated

Illuminated

Low power brake unit vacuum

×

—

C, D

×

U0001:88

Not illuminated

Illuminated

CAN communication: module communication error

×

—

C

×

U0100:02

Not illuminated

Illuminated

CAN communication: communication error to PCM

×

—

C

×

U0100:08

Not illuminated

Illuminated

CAN communication: communication error to PCM

×

—

C

×

U0121:00

Not illuminated

Illuminated

CAN communication: communication error to DSC HU/CM

×

—

C

×

U0121:02

Not illuminated

Illuminated

CAN communication: communication error to DSC HU/CM

×

—

C

×

U0121:87

Not illuminated

Illuminated

CAN communication: communication error to DSC HU/CM

×

—

C

×

U0155:00

Not illuminated

Not illuminated

CAN communication: communication error to instrument cluster

×

—

C

×

U0401:29

Not illuminated*3

Illuminated

Signal error from PCM

×

—

C

×

U0401:86

Not illuminated*3

Illuminated

Signal error from PCM

×

—

C

×

U0415:00

Not illuminated

Illuminated

Signal error from DSC HU/CM

×

—

C

×

U0415:29

Not illuminated

Illuminated

Signal error from DSC HU/CM

×

—

C

×

U0415:86

Not illuminated

Illuminated

Signal error from DSC HU/CM

×

—

C

×

U3000:11

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:12

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:46

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:47

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:4B

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:56

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3000:63

Illuminated

Illuminated

EVP control unit

×

—

C

×

U3000:96

Illuminated

Illuminated

EVP control unit

×

—

C, D

×

U3003:16

Illuminated

Illuminated

Power supply

×

—

C

×

U3003:17

Illuminated

Illuminated

Power supply

×

—

C

×
*1
When the parking brake is released
*2
C: CMDTC self test, D: ODDTC self test
*3
Brake system warning light illuminates when vacuum sensor 1 and 2 have a malfunction at the same time
Status byte for DTC

  • The status byte is the two-digit code (two digits after hyphen (-)) after the seven-digit DTC.

  • 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.

Fail-safe function table

DTC

EVP motor control

C101A:00

Permits control to drive the motor regularly

C101B:16

Permits control with vacuum sensor 2 signal only

C101B:17

Permits control with vacuum sensor 2 signal only

C101B:1C

Permits control with vacuum sensor 2 signal only

C101C:00

Inhibits control

C101C:18

Inhibits control

C101C:71

Inhibits control

C101C:72

Inhibits control

C101C:73

Inhibits control

C1035:11

Inhibits control

C1035:12

Inhibits control

C1035:13

Inhibits control

C1036:11

Inhibits control

C1036:12

Inhibits control

C1036:13

Inhibits control

P050F:00

Permits back-up control

U0001:88

Permits back-up control

U0100:02

Permits back-up control

U0100:08

Permits back-up control

U0121:00

Permits back-up control

U0121:02

Permits back-up control

U0121:87

Permits back-up control

U0155:00

Permits control

U0401:29

Permits control with vacuum sensor 1 signal only

U0401:86

Permits control with vacuum sensor 1 signal only

U0415:00

Permits back-up control

U0415:29

Permits back-up control

U0415:86

Permits back-up control

U3000:11

Inhibits control

U3000:12

Inhibits control

U3000:46

Inhibits control

U3000:47

Inhibits control

U3000:4B

Inhibits control

U3000:56

Inhibits control

U3000:63

Inhibits control

U3000:96

Inhibits control

U3003:16

Inhibits control

U3003:17

Inhibits control
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

—

—

APP_STATUS

Accelerator Pedal Off/

Under 20%/

Over 20%/

FAIL

Accelerator pedal position

—

—

BRK_SIG

Off/On

Brake pedal condition

—

—

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

—

—

ECU_TEMP

°C, °F

Module temperature

—

—

IC_VPWR

V

Instrument cluster power supply

  • The EVP control unit 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 EVP control unit 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 EVP control unit 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 EVP control unit records the elapsed time since the ignition was switched ON when the DTC was detected, and it is displayed in the M-MDS.

—

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 EVP control unit constantly receives the ignition switch status sent via CAN signal from the instrument cluster.

  • If a DTC is detected, the EVP control unit 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 EVP control unit constantly receives the ignition switch status sent via CAN signal from the instrument cluster.

  • If a DTC is detected, the EVP control unit 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 EVP control unit constantly receives the selector lever position sent via CAN signal from the instrument cluster.

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

—

TOTAL_DIST

km, ft, mi

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

The distance traveled when the EVP control unit 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 EVP control unit 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 EVP control unit 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.

—

VP_C

A

Electric vacuum pump current

—

—

VP_MV

V

Electric vacuum pump (-) terminal voltage

—

—

VP_PV

V

Electric vacuum pump (+) terminal voltage

—

—

VPD_THR

kPa

Electric vacuum pump deactivate threshold

—

—

VPR1_V

Off/On

Electric vacuum pump relay 1 condition

—

—

VPR2_V

Off/On

Electric vacuum pump relay 2 condition

—

—

VPWR

V

Power supply

—

—

VS1

kPa

Vacuum sensor 1

—

—

VS1_V

V

Vacuum sensor 1 power supply

—

—

VS2

kPa

Vacuum sensor 2

—

—

VSPD_STATUS

Stop/

0 - 10 km/h/

Over 10 km/h/

FAIL

Vehicle speed status

  • The EVP control unit constantly receives the vehicle speed sent via CAN signal from the instrument cluster.

  • If a DTC is detected, the EVP control unit 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
PID/data monitor function

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

Monitor item

Unit/operation

Definition

TBD

TBD

TBD
Simulation function

  • The simulation function is used for optionally selecting simulation items of input/output parts preset in the EVP control unit, and to operate them regardless of control.

Simulation item

Operation

Output part

Operating condition

TBD

TBD

TBD

TBD
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 EVP control unit 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 EVP control unit via CAN lines.

  • The EVP control unit 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

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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