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ON-BOARD DIAGNOSTIC SYSTEM MALFUNCTION DETECTION FUNCTION [TCM (SJ6A-EL)]

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2016 – MX-5 – Transmission/Transaxle

ON-BOARD DIAGNOSTIC SYSTEM MALFUNCTION DETECTION FUNCTION [TCM (SJ6A-EL)]

Purpose/Function

  • The malfunction diagnostic function detects transmission malfunctions.

  • Accurate and quick repair/service can be performed to facilitate malfunction cause determination using the malfunction detection function.

Construction/Operation

  • If a malfunction occurs in the transmission, it is recorded as a DTC. A DTC can be read by the Mazda Modular Diagnostic System (M-MDS).

DTC table

×: Applicable—: Not applicable

DTC No.

Check engine light

Automatic transmission warning light

Description

Fail-safe function

Drive cycle

Self test type*1

Memory function

P0601:00

Illuminated

Illuminated

TCM: ROM check sum error

×

1

C

×

P0603:00

Illuminated

Illuminated

TCM: EEPRPM check sum error

—

1

C

×

P0604:00

Illuminated

Illuminated

TCM: RAM access error

×

1

C

×

P0707:00

Illuminated

Illuminated

TR switch: Short circuit

×

1

C

×

P0708:00

Illuminated

Illuminated

TR switch: Open circuit

×

2

C

×

P0711:00

Illuminated

Illuminated

TFT sensor: Sensor malfunction

×

2

C

×

P0712:00

Illuminated

Illuminated

TFT sensor: Short to ground

×

1

C

×

P0713:00

Illuminated

Illuminated

TFT sensor: Open circuit

×

1

C

×

P0717:00

Illuminated

Illuminated

Turbine sensor: No signal input

×

1

C

×

P0722:00

Illuminated

Illuminated

VSS: No signal input

×

1

C

×

P0751:00

Illuminated

Illuminated

Shift solenoid A: Stuck off

×

2

C

×

P0752:00

Illuminated

Illuminated

Shift solenoid A/shift solenoid D: Stuck on

×

2

C

×

P0756:00

Illuminated

Illuminated

Shift solenoid B: Stuck off

×

2

C

×

P0757:00

Illuminated

Illuminated

Shift solenoid B: Stuck on

×

2

C

×

P0761:00

Illuminated

Illuminated

Shift solenoid C: Stuck off

×

2

C

×

P0762:00

Illuminated

Illuminated

Shift solenoid C: Stuck on

×

2

C

×

P0766:00

Illuminated

Illuminated

Shift solenoid D: Stuck off

×

2

C

×

Illuminated

Illuminated

Shift solenoid G: Stuck on

×

2

C

×

P0781:00

Illuminated

Illuminated

1-2 shift valve

×

2

C

×

P0813:00

Illuminated

Illuminated

Reverse sequence valve

×

2

C

×

P0819:00

—

Illuminated

M position switch up or down switch signal: Signal error

×

1

C

×

P0882:00

Illuminated

Illuminated

Power supply voltage: Low input

×

1

C

×

P0961:00

Illuminated

Illuminated

Line pressure control solenoid signal: Solenoid stuck

×

1

C

×

P0962:00

Illuminated

Illuminated

Line pressure control solenoid signal: Open/short circuit

×

1

C

×

P0963:00

Illuminated

Illuminated

Line pressure control solenoid signal: Short circuit

×

1

C

×

P0969:00

Illuminated

Illuminated

Shift solenoid F: Solenoid stuck

×

1

C

×

P0970:00

Illuminated

Illuminated

Shift solenoid F signal: Open/short circuit

×

1

C

×

P0971:00

Illuminated

Illuminated

Shift solenoid F signal: Short circuit

×

1

C

×

P0973:00

Illuminated

Illuminated

Shift solenoid A signal: Short circuit

×

1

C

×

P0974:00

Illuminated

Illuminated

Shift solenoid A signal: Open/short circuit

×

1

C

×

P0976:00

Illuminated

Illuminated

Shift solenoid B signal: Short circuit

×

1

C

×

P0977:00

Illuminated

Illuminated

Shift solenoid B signal: Open/short circuit

×

1

C

×

P0979:00

Illuminated

Illuminated

Shift solenoid C signal: Short circuit

×

1

C

×

P0980:00

Illuminated

Illuminated

Shift solenoid C signal: Open/short circuit

×

1

C

×

P0982:00

Illuminated

Illuminated

Shift solenoid D signal: Short circuit

×

1

C

×

P0983:00

Illuminated

Illuminated

Shift solenoid D signal: Open/short circuit

×

1

C

×

P0985:00

Illuminated

Illuminated

Shift solenoid E signal: Short circuit

×

1

C

×

P0986:00

Illuminated

Illuminated

Shift solenoid E signal: Open/short circuit

×

1

C

×

P2719:00

Illuminated

Illuminated

Shift solenoid G: Solenoid stuck

×

1

C

×

P2720:00

Illuminated

Illuminated

Shift solenoid G signal: Open/short circuit

×

1

C

×

P2721:00

Illuminated

Illuminated

Shift solenoid G signal: Short circuit

×

1

C

×

P2757:00

Illuminated

Illuminated

TCC: Stuck off

×

2

C

×

P2758:00

Illuminated

Illuminated

TCC: Stuck on

×

2

C

×

P2762:00

Illuminated

Illuminated

TCC control solenoid signal: Solenoid stuck

×

1

C

×

P2763:00

Illuminated

Illuminated

TCC control solenoid signal: Short circuit

×

1

C

×

P2764:00

Illuminated

Illuminated

TCC control solenoid signal: Open/short circuit

×

1

C

×

U0073:00

Illuminated

Illuminated

CAN communication: Module communication error

×

1

C

×

U0074:00

Illuminated

Illuminated

CAN communication: Module communication error (local CAN between TCM and PCM)

×

1

C

×

U0100:00

Illuminated

Illuminated

CAN communication: Communication error between PCM

—

1

C

×

U0115:00

Illuminated

Illuminated

CAN communication: Communication error between PCM (local CAN between TCM and PCM)

×

1

C

×

U0121:00

Illuminated

Illuminated

CAN communication: Communication error between DSC HU/CM

×

1

C

×

U0131:00

—

—

CAN communication: Communication error between EPS control module

—

1

C

×

U0155:00

—

—

CAN communication: Communication error between instrument cluster

×

1

C

×

U0214:00

—

—

CAN communication: Communication error between start stop unit

×

1

C

×

U0442:00

—

—

CAN communication: Error signal received from PCM

×

1

C

×

*1
C: CMDTC self test

DTC separate detection condition

DTC No.

Description

Detection condition

P0601:00

TCM: ROM check sum error

  • Vehicle condition: Under any condition

  • Status: Detects internal flash ROM malfunction

  • Period: Confirmed 1 time

P0603:00

TCM: EEPRPM check sum error

  • Vehicle condition: Under any condition

  • Status: TCM detects different numeric values for EEPROM and RAM

  • Period: Confirmed 1 time

P0604:00

TCM: RAM access error

  • Vehicle condition: Under any condition

  • Status: Detects RAM read/write malfunction

  • Period: Confirmed 1 time

P0707:00

TR switch: Short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects TR switch multiple input

  • Period: Confirmed 5 times in 2 s or more

P0708:00

TR switch: Open circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects no output of TR switch at vehicle speed of 30 km/h {19 mph} or higher

  • Period: Confirmed 1 time in 30 s or more

P0711:00

TFT sensor: Sensor malfunction

  • Vehicle condition: While driving in D or R position with engine rotating

  • Status: Detects no change in ATF temperature

  • Period: Confirmed 1 time continuously for 10 min or more

P0712:00

TFT sensor: Short to ground

  • Vehicle condition: TCM communication normal while engine rotates in warm-up condition

  • Status: Detects ATF temperature of 200 °C {392 °F} or more

  • Period: Confirmed 6 times in 10 s or more

P0713:00

TFT sensor: Open circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects ATF temperature of less than –43 °C {–45.4 °F}

  • Period: Confirmed 12 times in 1 s or more

P0717:00

Turbine sensor: No signal input

  • Vehicle condition: TCM normal during engine rotation

  • Status: Turbine sensor signal not input during VSS 12-pulse detection

  • Period: Confirmed 500 times

P0722:00

VSS: No signal input

  • Vehicle condition: TCM normal during engine rotation

  • Status: VSS signal not input during turbine sensor 12-pulse detection

  • Period: Confirmed 500 times

P0751:00

Shift solenoid A: Stuck off

  • Vehicle condition: Shift solenoid A signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid A does not change from off

  • Period: Confirmed 1 time

P0752:00

Shift solenoid A/shift solenoid D: Stuck on

  • Vehicle condition: Shift solenoid A or D signal is output while the TCM is normal with engine running.

  • Status: Detects that shift solenoid A or D does not change from on.

  • Period: Confirmed 2 times

P0756:00

Shift solenoid B: Stuck off

  • Vehicle condition: Shift solenoid B signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid B does not change from off

  • Period: Confirmed 1 time

P0757:00

Shift solenoid B: Stuck on

  • Vehicle condition: Shift solenoid B signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid B does not change from on

  • Period: Confirmed 1 time

P0761:00

Shift solenoid C: Stuck off

  • Vehicle condition: Shift solenoid C signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid C does not change from off

  • Period: Confirmed 1 time

P0762:00

Shift solenoid C: Stuck on

  • Vehicle condition: Shift solenoid C signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid C does not change from on

  • Period: Confirmed 1 time

P0766:00

Shift solenoid D: Stuck off

  • Vehicle condition: Shift solenoid D signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid D does not change from off

  • Period: Confirmed 1 time

Shift solenoid G: Stuck on

  • Vehicle condition: Shift solenoid G signal is output while the TCM is normal with engine running

  • Status: Detects that shift solenoid G does not change from on

  • Period: Confirmed 1 time

P0781:00

1-2 shift valve

  • Vehicle condition: During shifting from 3GR to 4GR

  • Status: Detects that 1-2 shift valve does not move

  • Period: Confirmed 1 time

P0813:00

Reverse sequence valve

  • Vehicle condition: During shifting from 4GR to 5GR

  • Status: Detects that reverse sequence valve does not move

  • Period: Confirmed 1 time

P0819:00

M position switch up or down switch signal: Signal error
    M position switch signal error

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that M position switch is on in P, R or N position

  • Period: Confirmed continuously for 2 s

    Up switch malfunction or down switch signal error

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that up or down switch is on while M position switch is off

  • Period: Confirmed continuously for 10 s

P0882:00

Power supply voltage: Low input

  • Vehicle condition: TCM communication normal while engine is idling

  • Status: Detects terminal B+ current of 9.05 V or less

  • Period: Confirmed 20 times continuously for 1 s or more

P0961:00

Line pressure control solenoid signal: Solenoid stuck

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that feedback current value is incorrect relative to electrical current command value of line pressure control solenoid

  • Period: Confirmed 2 times continuously

P0962:00

Line pressure control solenoid signal: Open/short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects open circuit or short to ground in line pressure control solenoid signal system

  • Period: Confirmed 5 times in 0.1 s or more

P0963:00

Line pressure control solenoid signal: Short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects open circuit or short to ground in line pressure control solenoid signal system

  • Period: Confirmed 5 times in 0.1 s or more

P0969:00

Shift solenoid F: Solenoid stuck

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that feedback current value is incorrect relative to electrical current command value of shift solenoid F

  • Period: Confirmed 2 times continuously

P0970:00

Shift solenoid F signal: Open/short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects open circuit or short to ground in shift solenoid F signal system

  • Period: Confirmed 5 times in 0.1 s or more

P0971:00

Shift solenoid F signal: Short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects short to power supply in shift solenoid F signal system

  • Period: Confirmed 5 times in 0.1 s or more

P0973:00

Shift solenoid A signal: Short circuit

  • Vehicle condition: Shift solenoid A ON signal is output while TCM is normal with engine running

  • Status: Detects short to ground in shift solenoid A signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0974:00

Shift solenoid A signal: Open/short circuit

  • Vehicle condition: Shift solenoid A OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid A signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0976:00

Shift solenoid B signal: Short circuit

  • Vehicle condition: Shift solenoid B ON signal is output while TCM is normal with engine running

  • Status: Detects short to ground in shift solenoid B signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0977:00

Shift solenoid B signal: Open/short circuit

  • Vehicle condition: Shift solenoid B OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid B signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0979:00

Shift solenoid C signal: Short circuit

  • Vehicle condition: Shift solenoid C ON signal is output while TCM is normal with engine running

  • Status: Detects short to ground in shift solenoid C signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0980:00

Shift solenoid C signal: Open/short circuit

  • Vehicle condition: Shift solenoid C OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid C signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0982:00

Shift solenoid D signal: Short circuit

  • Vehicle condition: Shift solenoid D ON signal is output while TCM is normal with engine running

  • Status: Detects short to ground in shift solenoid D signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0983:00

Shift solenoid D signal: Open/short circuit

  • Vehicle condition: Shift solenoid D OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid D signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0985:00

Shift solenoid E signal: Short circuit

  • Vehicle condition: Shift solenoid E ON signal is output while TCM is normal with engine running

  • Status: Detects short to ground in shift solenoid E signal system

  • Period: Confirmed 1 time in 0.5 s or more

P0986:00

Shift solenoid E signal: Open/short circuit

  • Vehicle condition: Shift solenoid E OFF signal is output while TCM is normal with engine running

  • Status: Detects open circuit or short to power supply in shift solenoid E signal system

  • Period: Confirmed 1 time in 0.5 s or more

P2719:00

Shift solenoid G: Solenoid stuck

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that feedback current value is incorrect relative to electrical current command value of shift solenoid G

  • Period: Confirmed 2 times continuously

P2720:00

Shift solenoid G signal: Open/short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects open circuit or short to ground in shift solenoid G signal system

  • Period: Confirmed 5 times in 0.1 s or more

P2721:00

Shift solenoid G signal: Short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects short to power supply in shift solenoid G signal system

  • Period: Confirmed 5 times in 0.1 s or more

P2757:00

TCC: Stuck off

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects that TCC control solenoid does not change from off

  • Period: Confirmed 1 time in 2 s or more

P2758:00

TCC: Stuck on

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects that TCC control solenoid does not change from on

  • Period: Confirmed 2 times in 1.8 s or more

P2762:00

TCC control solenoid signal: Solenoid stuck

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that feedback current value is incorrect relative to electrical current command value of TCC control solenoid

  • Period: Confirmed 2 times continuously

P2763:00

TCC control solenoid signal: Short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects short to power supply in TCC control solenoid signal system

  • Period: Confirmed 5 times in 0.1 s or more

P2764:00

TCC control solenoid signal: Open/short circuit

  • Vehicle condition: TCM normal during engine rotation

  • Status: Detects open circuit or short to ground in pressure control solenoid signal system

  • Period: Confirmed 5 times in 0.1 s or more

U0073:00

CAN communication: Module communication error

  • Vehicle condition: TCM communication normal

  • Status: Detects CAN BUS OFF malfunction

  • Period: After CAN controller reset, confirmed by re-detection

U0074:00

CAN communication: Module communication error (local CAN between TCM and PCM)

  • Vehicle condition: TCM communication normal

  • Status: Detects CAN BUS OFF malfunction

  • Period: After CAN controller reset, confirmed by re-detection

U0100:00

CAN communication: Communication error between PCM

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with PCM

  • Period: Detects communication time-out

U0115:00

CAN communication: Communication error between PCM (local CAN between TCM and PCM)

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with PCM

  • Period: Detects communication time-out

U0121:00

CAN communication: Communication error between DSC HU/CM

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with DSC HU/CM

  • Period: Confirmed 1 time in 0.5 s or more, or 2 s or more

U0131:00

CAN communication: Communication error between EPS control module

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with EPS control module

  • Period: Confirmed 1 time in 0.5 s or more

U0155:00

CAN communication: Communication error between instrument cluster

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with instrument cluster

  • Period: Confirmed 1 time in 2 s or more

U0214:00

CAN communication: Communication error between start stop unit

  • Vehicle condition: TCM communication normal

  • Status: Detects communication error with start stop unit

  • Period: Confirmed 1 time in 2 s or more

U0442:00

CAN communication: Error signal received from PCM

  • Throttle opening signal error

    • Vehicle condition: TCM communication normal

    • Status: Detects throttle opening angle signal error

    • Period: Confirmed 1 time in 0.5 s or more

  • Accelerator opening angle signal error

    • Vehicle condition: TCM communication normal

    • Status: Detects accelerator opening angle signal error

    • Period: Confirmed 1 time in 0.5 s or more

  • Engine torque signal error

    • Vehicle condition: TCM communication normal

    • Status: Detects engine torque signal error

    • Period: Confirmed 1 time in 0.5 s or more

  • Engine speed signal error

    • Vehicle condition: TCM communication normal

    • Status: Detects engine speed signal error

    • Period: Confirmed 1 time in 0.5 s or more

  • Engine coolant temperature signal error

    • Vehicle condition: TCM communication normal

    • Status: Detects engine coolant signal error

    • Period: Confirmed 1 time in 0.5 s or more

  • Detects engine misfire

    • Vehicle condition: TCM communication normal

    • Status: Detects engine misfire determination signal

    • Period: Confirmed 1 time

Drive cycle

  • The drive cycle is the period of time from when the engine is started to the next time the engine is started.

  • One drive cycle, as shown in the figure, indicates the period from the time engine is started to the next time the engine is started. If this period is repeated twice it then becomes two drive cycles.

  • To detect DTCs, a required number of drive cycles for pre-detection has been set. For the number of drive cycles required for detection, refer to the DTC table.

Pending code

  • The pending code is temporary malfunction code which differs from DTCs which are recorded when the TCM detects a transmission malfunction.

  • DTCs are recorded in the TCM according to the number of drive cycles when the TCM detects a transmission malfunction. At the same time, pending code is recorded in the TCM regardless of the number of drive cycles.

  • Pending code recorded in the TCM is erased from the TCM, from the next drive cycle, when the TCM determines that the transmission is normal.

Status byte for DTC

  • The status byte is the two-digit code (two digits after hyphen (-)) after the 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 Mazda Modular Diagnostic System (M-MDS) when reading the DTC.

Self test function

  • When the self test is implemented, the TCM performs diagnosis of the transmission control system. If a malfunction is detected with the results of the diagnosis, an applicable DTC is recorded. A recorded DTC can be read by the Mazda Modular Diagnostic System (M-MDS).

  • By implementing the self test function, verification of the current malfunction and verification after repair is facilitated.

    CMDTC (Continuous Memory Diagnostic Trouble Code) self test

  • The CMDTC self test is a function which reads all DTCs recorded in the TCM after the previous DTCs are erased no matter whether they are past malfunctions or current malfunctions.

    KOEO (Key On Engine Off) self test

  • The KOEO self test can perform malfunction diagnosis of DTCs corresponding to this self test function when the ignition is switched ON and the engine is stopped. This self test implements based on the test implementation command signal sent to the TCM from the Mazda Modular Diagnostic System (M-MDS).

Freeze frame data/Snapshot data
    Freeze frame data

  • The freeze frame data consists of data for vehicle and transmission control system operation conditions when malfunctions in the transmission control system are detected and stored in the TCM.

  • Freeze frame data is stored at the instant the malfunction indicator lamp illuminates, and only a part of the DTC data is stored.

    Snapshot data

  • The data for all DTCs currently detected is stored.

      • Recorded DTC timing

    • For DTCs with one drive cycle, data is recorded during the malfunction determination period.

    • For DTCs with two drive cycles, data is recorded during non-determination (1st diagnosis) periods.

Freeze frame data item table—: Not applicable

Freeze frame data item

Unit

Description

Corresponding PID/DATA monitor item

TBD

TBD

TBD

TBD

Snapshot data item table—: Not applicable

Snapshot data item

Unit

Description

Corresponding PID/DATA monitor item

TBD

TBD

TBD

TBD

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