Mazda 3 Quiz
Drivetrain

TCM Inspection [FS5 A EL]

In this manual: Drivetrain
Vehicle general — 15Accessories — 111Body — 339Brakes — 71Drivetrain — 143Electrical — 58Engine — 251HVAC — 72Restraints — 15Steering — 32Suspension — 41
~6min read
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. Connect the voltmeter (-) lead to body GND.

2. Measure the voltage at each terminal.

  • If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the “Inspection Item” column in the “TCM Terminal Voltage”.

TCM Terminal Voltage (Reference)


Terminal

Connected to

Test Condition

Voltage (V)

Inspection Item

A

—

—

—

—

B

CAN module

Because this terminal is for CAN, no valid determination of terminal voltage is possible.

C

—

—

—

—

D

—

—

—

—

E

CAN module

Because this terminal is for CAN, no valid determination of terminal voltage is possible.

F

Down switch

Selector lever down-shift position

Below 1.0

  • Down switch

    (See DOWN SWITCH INSPECTION [FS5A-EL].)

  • Related harness

Except selector lever down-shift position

B+

G

Up switch

Selector lever up-shift position

Below 1.0

  • Up switch

    (See UP SWITCH INSPECTION [FS5A-EL].)

  • Related harness

Except selector lever up-shift position

B+

H

—

—

—

—

I

AT main relay

Ignition switch off

Below 1.0

  • AT main relay

    (See RELAY INSPECTION [MZR 2.0, MZR 2.5, MZR 2.3 DISI Turbo].)

  • Related harness

Ignition switch ON

B+

J

Battery

Under any condition

B+

  • Battery

    (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)

  • Related harness

K

M position switch

M position

Below 1.0

  • M position switch

    (See M POSITION SWITCH INSPECTION [FS5A-EL].)

  • Related harness

Except M position

B+

L

GND

Under any condition

Below 1.0

  • Related harness

M

GND

Under any condition

Below 1.0

  • Related harness

N

—

—

—

—

O

AT main relay

Ignition switch off

Below 1.0

  • AT main relay

    (See RELAY INSPECTION [MZR 2.0, MZR 2.5, MZR 2.3 DISI Turbo].)

  • Related harness

Ignition switch ON

B+

P

AT main relay

Ignition switch off

Below 1.0

  • AT main relay

    (See RELAY INSPECTION [MZR 2.0, MZR 2.5, MZR 2.3 DISI Turbo].)

  • Related harness

Ignition switch ON

B+

Q

—

—

—

—

R

—

—

—

—

S

Oil pressure switch

1GR

Below 1.0

  • Oil pressure switch

    (See OIL PRESSURE SWITCH INSPECTION [FS5A-EL].)

  • Related harness

2GR

Below 1.0

3GR

Below 1.0

4GR

B+

5GR

B+

T

—

—

—

—

U

TR switch

Selector lever at P position

4.3—4.8

  • TR switch

    (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL].)

  • Related harness

Selector lever at R position

3.8—4.2

Selector lever at N position

3.0—3.5

Selector lever at D position

2.2—2.7

Selector lever at M position

2.2—2.7

V

TR switch, TFT sensor

Under any condition

Below 1.0

  • Related harness

W

—

—

—

—

X

—

—

—

—

Y

Input/turbine speed sensor (-)

(See Input/turbine speed sensor.)

  • Input/turbine speed sensor

    (See INPUT/TURBINE SPEED SENSOR INSPECTION [FS5A-EL].)

  • Related harness

Z

VSS

(See VSS.)

  • VSS

    (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].)

  • Related harness

AA

TFT sensor

ATF temperature 20 °C {68 °F}

Approx.3.3

  • TFT sensor

    (See TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR INSPECTION [FS5A-EL].)

  • Related harness

ATF temperature 65 °C {149 °F}

Approx.1.3

AB

Input/turbine speed sensor (+)

(See Input/turbine speed sensor.)

  • Input/turbine speed sensor

    (See INPUT/TURBINE SPEED SENSOR INSPECTION [FS5A-EL].)

  • Related harness

AC

Intermediate sensor

(See Intermediate sensor.)

  • Intermediate sensor

    (See INTERMEDIATE SENSOR INSPECTION [FS5A-EL].)

  • Related harness

AD

Pressure control solenoid A (+)

(See Pressure control solenoid A (+).)

  • Pressure control solenoid A

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

AE

Pressure control solenoid A (-)

(See Pressure control solenoid A (-).)

  • Pressure control solenoid A

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

AF

—

—

—

—

AG

Shift solenoid A

(See Shift solenoid A.)

  • Shift solenoid A

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

AH

Shift solenoid D

1GR at D position

Below 1.0

  • Shift solenoid D

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

2GR at D position

Below 1.0

3GR at D position

Below 1.0

4GR at D position

B+

5GR at D position

B+

AI

Shift solenoid F

1GR at D position

B+

  • Shift solenoid F

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

2GR at D position

B+

3GR at D position

B+

4GR at D position

B+

5GR at D position

Below 1.0

AJ

Shift solenoid B

(See Shift solenoid B.)

  • Shift solenoid B

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

AK

Shift solenoid E

TCC released

Below 1.0

  • Shift solenoid E

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

TCC engaged

B+

AL

Shift solenoid C

(See Shift solenoid C.)

  • Shift solenoid C

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

AM

Pressure control solenoid B

(See Pressure control solenoid B.)

  • Pressure control solenoid B

    (See SOLENOID VALVE INSPECTION [FS5A-EL].)

  • Related harness

Input/Output Wave From (Reference) Shift solenoid A

    TCM terminals

  • AG (+)—body GND (-)

    Oscilloscope setting

  • 5 V/DIV (Y), 5 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Selector lever position: D position

    • Gear position: 4GR

Shift solenoid B

    TCM terminals

  • AJ (+)—body GND (-)

    Oscilloscope setting

  • 5 V/DIV (Y), 5 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Selector lever position: D position

    • Gear position: 1GR

Shift solenoid C

    TCM terminals

  • AL (+)—body GND (-)

    Oscilloscope setting

  • 5 V/DIV (Y), 5 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Selector lever position: D position

    • Gear position: 1GR

Pressure control solenoid B

    TCM terminals

  • AM (+)—body GND (-)

    Oscilloscope setting

  • 5 V/DIV (Y), 5 ms/DIV (X), DC range

    Test Condition

  • Shifting from 4GR to 5GR or from 5GR to 4GR

Pressure control solenoid A (+)

    TCM terminals

  • AD (+)—body GND (-)

    Oscilloscope setting

  • 5 V/DIV (Y), 1 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Switch the ignition to ON (engine off)

    • Selector lever position: P position

    • Accelerator pedal fully depressed

Pressure control solenoid A (-)

    TCM terminals

  • AE (+)—body GND (-)

    Oscilloscope setting

  • 200 mV/DIV (Y), 1 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Switch the ignition to ON (engine off)

    • Selector lever position: P position

    • Accelerator pedal fully depressed

Input/turbine speed sensor

    TCM terminals

  • AB (+)—Y (-)

    Oscilloscope setting

  • 1 V/DIV (Y), 2 ms/DIV (X), DC range

    Test Condition

  • Idle at P position after warm-up

Intermediate sensor

    TCM terminals

  • AC (+)—body GND (-)

    Oscilloscope setting

  • 1 V/DIV (Y), 200 µs/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Gear position: 3GR

    • Vehicle speed: 30 km/h {19 mph}

VSS

    TCM terminals

  • Z (+)—body GND (-)

    Oscilloscope setting

  • 1 V/DIV (Y), 2 ms/DIV (X), DC range

    Test Condition

  • The following conditions are met:

    • Gear position: 3GR

    • Vehicle speed: 30 km/h {19 mph}

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