Mazda 3 Service Manual: TCM Inspection [FS5 A EL]

Mazda 3 Service Manual / Drivetrain / Transmission/Transaxle / Automatic / TCM Inspection [FS5 A 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. 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
F	Down switch	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
G	Up switch	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
I	AT main relay	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
K	M position switch	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
O	AT main relay	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
P	AT main relay	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
AA	TFT sensor	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
AK	Shift solenoid E	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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