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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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TCM INSPECTION [SJ6A-EL]

NOTE:

  • The TCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the TCM is necessary to determine where the malfunction occurs.

1. Measure the terminal voltage of the TCM using a tester.

Terminal Voltage Table (Reference)

Terminal

Connected to

Test Condition

Specification

Inspection item(s)

1A

Turbine sensor

1B

Turbine sensor

Ignition switch ON

Approx. 2.5 V

1C

VSS

Ignition switch ON

Approx. 2.5 V

1D

VSS

1E

Sensor shield

Under any condition

Below 1.0 V

  • Inspect the related wiring harness

1F

???

???

???

???

1G

???

???

???

???

1H

Sensor shield

Under any condition

Below 1.0 V

  • Inspect the related wiring harness

1I

???

???

???

???

1J

???

???

???

???

1K

TR switch

P position

B+

R position

B+

N position

B+

D position

Below 1.0 V

M position

Below 1.0 V

1L

???

???

???

???

1M

TR switch

P position

B+

R position

Below 1.0 V

N position

B+

D position

B+

M position

B+

1N

TR switch

P position

B+

R position

B+

N position

Below 1.0 V

D position

B+

M position

B+

1O

TR switch

P position

Below 1.0 V

R position

B+

N position

B+

D position

B+

M position

B+

1P

???

???

???

???

1Q

TFT check connector

Under any condition

B+

  • Inspect the related wiring harness

1R

IG1 relay

Ignition switch OFF

Below 1.0 V

  • Inspect the IG1 relay

    (See RELAY INSPECTION)

  • Inspect the related wiring harness

Ignition switch ON

B+

1S

???

???

???

???

1T

???

???

???

???

1U

???

???

???

???

1V

???

???

???

???

1W

???

???

???

???

1X

???

???

???

???

1Y

???

???

???

???

1Z

???

???

???

???

1AA

???

???

???

???

1AB

???

???

???

???

1AC

???

???

???

???

1AD

???

???

???

???

1AE

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

1AF

???

???

???

???

1AG

???

???

???

???

1AH

???

???

???

???

1AI

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

2A

???

???

???

???

2B

???

???

???

???

2C

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

2D

TCC control solenoid

2E

Line pressure control solenoid

Idle and selector lever is at P position or N position

Below 1.0 V

2F

???

???

???

???

2G

CAN related module

Because this terminal is for communication, determination using terminal voltage inspection is not possible. Perform the inspection using the DTC inspection.

2H

???

???

???

???

2I

???

???

???

???

2J

TFT sensor

ATF temperature 20°C {68°F}

Approx. 3.0 V

ATF temperature 40°C {104°F}

Approx. 2.1 V

ATF temperature 60°C {140°F}

Approx. 1.4 V

2K

???

???

???

???

2L

Shift solenoid G

2M

TFT sensor

Under any condition

Below 1.0 V

2N

???

???

???

???

2O

Shift solenoid F

2P

GND

Under any condition

Below 1.0 V

  • Inspect the related wiring harness

2Q

TCC control solenoid

2R

Line pressure control solenoid

2S

Shift solenoid D

1GR

Below 1.0 V

2GR

Below 1.0 V

3GR

Below 1.0 V

4GR

Below 1.0 V

5GR

B+

6GR

B+

2T

???

???

???

???

2U

???

???

???

???

2V

Shift solenoid E

1GR

B+

2GR

B+

3GR

B+

4GR

B+

5GR

Below 1.0 V

6GR

Below 1.0 V

2W

???

???

???

???

2X

GND

Under any condition

Below 1.0 V

  • Inspect the related wiring harness

2Y

Shift solenoid G

2Z

Shift solenoid F

2AA

Shift solenoid C

1GR

B+

2GR

B+

3GR

B+

4GR

Below 1.0 V

5GR

Below 1.0 V

6GR

Below 1.0 V

2AB

Shift solenoid B

1GR

B+

2GR

B+

3GR

Below 1.0 V

4GR

Below 1.0 V

5GR

Below 1.0 V

6GR

B+

2AC

???

???

???

???

2AD

ACC relay

Ignition switch OFF

Below 1.0 V

  • Inspect the ACC relay

    (See RELAY INSPECTION)

  • Inspect the related wiring harness

Ignition switch ACC

B+

2AE

Battery

Under any condition

B+

2AF

Shift solenoid A

1GR

Below 1.0 V

2GR

B+

3GR

B+

4GR

B+

5GR

B+

6GR

B+

2AG

???

???

???

???

2AH

???

???

???

???

2AI

Battery

Under any condition

B+

Inspection Using An Oscilloscope (Reference)

Turbine sensor (+)

  • TCM terminal: 1A

  • Oscilloscope setting: 2 V/DIV (Y) 2 ms/DIV (X)

  • Measuring condition: Vehicle speed at 30 km/h {19 mph} (D position 1GR)

Vehicle speed (+)

  • TCM terminal: 1D

  • Oscilloscope setting: 2.5 V/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: Vehicle speed at 30 km/h {19 mph} (D position 1GR)

TCC control solenoid control (-)

  • TCM terminal: 2D

  • Oscilloscope setting: 50 mV/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: P, N position, Idle

Shift solenoid G control (-)

  • TCM terminal: 2L

  • Oscilloscope setting: 50 mV/DIV (Y) 1ms/DIV (X)

  • Measuring condition: M position 1GR

Shift solenoid F control (-)

  • TCM terminal: 2O

  • Oscilloscope setting: 100 mV/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: M position 5GR

TCC control solenoid control (+)

  • TCM terminal: 2Q

  • Oscilloscope setting: 2.5 V/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: P, N position, Idle

Line pressure control solenoid control (+)

  • TCM terminal: 2R

  • Oscilloscope setting: 2.5 V/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: P, N position, Idle

Shift solenoid G control (+)

  • TCM terminal: 2Y

  • Oscilloscope setting: 2.5 V/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: M position 1GR

Shift solenoid F control (+)

  • TCM terminal: 2Z

  • Oscilloscope setting: 2.5 V/DIV (Y) 1 ms/DIV (X)

  • Measuring condition: M position 5GR

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

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