TCM INSPECTION [FS5A-EL]

id051721800300

Caution
•  The TCM terminal voltages vary with changes in measuring and vehicle conditions. Always carry out a total inspection of the input and output systems, and the TCM to determine the cause of trouble. Otherwise, a mis-diagnosis could occur.

1.  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 Action column in the terminal voltage table.


Terminal Voltage Table (Reference)

Note
•  Use the ground of terminal L and M of the TCM when measuring terminal voltage, as an error may occur when connecting the negative circuit tester to ground.
am3zzw00003083

Terminal

Signal

Connected to

Test condition

Voltage (V)

Action
A
—
—
—
—
—
B
CAN_H
Instrument cluster, ABS HU/CM, ABS/TCS HU/CM, DSC HU/CM
Because this terminal is for CAN, adequate determination by terminal voltage is not possible.
—
C
—
—
—
—
—
D
—
—
—
—
—
E
CAN_L
Instrument cluster, ABS HU/CM, ABS/TCS HU/CM, DSC HU/CM
Because this terminal is for CAN, adequate determination by terminal voltage is not possible.
—
F
Manual down
Down switch
Ignition switch ON
Detects down-shift operation of selector lever in M range
Below 1.0
•  Inspect down switch
•  Inspect related harness
Other
B+
G
Manual up
Up switch
Ignition switch ON
Detects up-shift operation of selector lever in M range
Below 1.0
•  Inspect up switch
•  Inspect related harness
Other
B+
H
—
—
—
—
—
I
B+
Main relay
Ignition switch OFF
Below 1.0
•  Inspect battery
•  Inspect related harness
Ignition switch ON
B+
J
Back-up power supply
Battery (positive terminal)
Under any condition
B+
•  Inspect battery
•  Inspect related harness
K
M range
M range switch
Ignition switch ON
Manual mode
Below 1.0
•  Inspect M range switch
•  Inspect related harness
Other
B+
L
GND
GND
Under any condition
Below 1.0
•  Inspect related harness
M
GND
GND
Under any condition
Below 1.0
•  Inspect related harness
N
—
—
—
—
—
O
B+
Main relay
Ignition switch OFF
Below 1.0
•  Inspect battery
•  Inspect related harness
Ignition switch ON
B+
P
Main relay control
Main relay
Ignition switch OFF
B+
•  Inspect main relay
•  Inspect related harness
Ignition switch ON
Below 1.0
Q
—
—
—
—
—
R
—
—
—
—
—
S
Oil pressure
Oil pressure switch
Ignition switch ON
Detects forward clutch pressure
Below 1.0
•  Inspect oil pressure switch
•  Inspect related harness
T
Shift up/Shift down signal
(Steering shift switch)
Steering shift switch
Up switch and down switch operated
(Steering shift switch)
Approx. 1.8
•  Inspect steering shift switch
•  Inspect related harness
Up switch operated
(Steering shift switch)
Approx. 2.3
Down switch operated
(Steering shift switch)
Approx. 3.0
Others
Approx. 5.0
U
Selector lever position
TR switch
(terminal C)
Ignition switch ON
P position
Approx. 4.6
•  Inspect TR switch
•  Inspect related harness
R position
Approx. 3.9
N position
Approx. 3.2
D range
M range
Approx. 2.5
V
Sensor GND
MAF/IAT sensor, A/F sensor, HO2S, Variable resistor, ECT sensor, TP sensor, MAP sensor, TFT sensor, TR switch
Under any condition
Below 1.0
•  Inspect related harness
W
Cruise control switch
Cruise control switch
Ignition switch to the ON position
ON/OFF switch pressed in
Approx. 0
•  Cruise control switch
•  Inspect related harness
CANCEL switch pressed in
Approx. 1.1
SET/COAST switch pressed in
Approx. 3.1
RES/ACCEL switch pressed in
Approx. 4.2
Except above
Approx. 5.0
X
Steering shift switch GND
Steering shift switch
Under any condition
Below 1.0
•  Inspect related harness
Y
Input/turbine speed sensor (–)
Input/turbine speed sensor
•  Inspect using the wave profile.
•  Inspect input/turbine speed sensor
•  Inspect related harness
Z
Vehicle speed
VSS
•  Inspect using the wave profile.
•  Inspect VSS
•  Inspect related harness
AA
ATF temperature
TFT sensor
Ignition switch ON
TFT 20 °C
{68 °F}
Approx. 3.3
•  Inspect TFT sensor
•  Inspect related harness
TFT 40 °C
{104 °F}
Approx. 2.4
TFT 60 °C
{140 °F}
Approx. 1.5
AB
Input/turbine speed sensor (+)
Input/turbine speed sensor
•  Inspect using the wave profile.
•  Inspect input/turbine speed sensor
•  Inspect related harness
AC
Secondary gear rotating speed
Intermediate sensor
•  Inspect using the wave profile.
•  Inspect intermediate sensor
•  Inspect related harness
AD
Pressure control solenoid A (+)
Pressure control solenoid A
•  Inspect using the wave profile.
•  Inspect pressure control solenoid A
•  Inspect related harness
AE
Pressure control solenoid A (–)
Pressure control solenoid A
•  Inspect using the wave profile.
•  Inspect pressure control solenoid A
•  Inspect related harness
AF
—
—
—
—
—
AG
Shift solenoid A control
Shift solenoid A
•  Inspect using the wave profile.
•  Inspect shift solenoid A
•  Inspect related harness
AH
Shift solenoid D control
Shift solenoid D
Selector lever is at P, N, D (2GR, 4GR, 5GR), M (1GR) position
B+
•  Inspect shift solenoid D
•  Inspect related harness
Other
Below 1.0
AI
Shift solenoid F control
Shift solenoid F
1GR, 2GR, 3GR, 4GR
B+
•  Inspect shift solenoid F
•  Inspect related harness
5GR
Below 1.0
AJ
Shift solenoid B control
Shift solenoid B
•  Inspect using the wave profile.
•  Inspect shift solenoid B
•  Inspect related harness
AK
Shift solenoid E control
Shift solenoid E
Detects TCC operation
B+
•  Inspect shift solenoid E
•  Inspect related harness
Other
Below 1.0
AL
Shift solenoid C control
Shift solenoid C
•  Inspect using the wave profile.
•  Inspect shift solenoid C
•  Inspect related harness
AM
Pressure control solenoid B
Pressure control solenoid B
•  Inspect using the wave profile.
•  Inspect pressure control solenoid B
•  Inspect related harness


Inspection Using an Oscilloscope (Reference)


Secondary gear rotating speed signal

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TCM terminals
•  AC (+)—M (–)
Oscilloscope setting
•  1 V/DIV (Y), 2.5 ms/DIV (X), DC range
Vehicle condition
•  Drive the vehicle at approx. 32 km/h {19.9 mph}


VSS signal

am3zzw00003084
TCM terminals
•  Z (+)—M (–)
Oscilloscope setting
•  1 V/DIV (Y), 2.5 ms/DIV (X), DC range
Vehicle condition
•  Drive the vehicle at approx. 32 km/h {19.9 mph}


Input/turbine speed sensor signal

am3zzw00003085
TCM terminals
•  AB (+)—M (–)
Oscilloscope setting
•  500 mV/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)


Pressure control solenoid A signal

(–)

am3zzw00003086
TCM terminals
•  AE (+)—M (–)
Oscilloscope setting
•  200 mV/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)

(+)

am3zzw00003087
TCM terminals
•  AD (+)—M (–)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off)


Pressure control solenoid B signal

am3zzw00003088
TCM terminals
•  AM (+)—M (–)
Oscilloscope setting
•  5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•  4GR→5GR, 5GR→4GR


Shift solenoid A control

am3zzw00003089
TCM terminals
•  AG (+)—M (–)
Oscilloscope setting
•  5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•  4GR (D range)


Shift solenoid B control

am3zzw00003090
TCM terminals
•  AJ (+)—M (–)
Oscilloscope setting
•  5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•  1GR (D range)


Shift solenoid C control

am3zzw00003091
TCM terminals
•  AL (+)—M (–)
Oscilloscope setting
•  5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•  1GR or 2GR