Infiniti F50. Manual - part 36

 

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Infiniti F50. Manual - part 36

 

 

A/T CONTROL SYSTEM

AT-29

D

E

F

G

H

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J

K

L

M

A

B

AT

CAN Communication

ECS0082R

SYSTEM DESCRIPTION 

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

FOR VDC MODELS
System diagram

Input/output signal chart

T: Transmit   R: Receive

SKIA3762E

Signals

TCM

Combination 

meter

Steering angle 

sensor

VDC/TCS/ABS 

control unit

ECM

Engine speed signal

R

R

R

T

Engine coolant temperature signal

R

R

T

Accelerator pedal position signal

R

R

T

Engine torque signal

R

R

T

Battery voltage signal

R

T

Closed throttle position signal

R

T

Wide open throttle position signal

R

T

Lock-up prohibition signal

R

T

Torque-down permission signal

R

T

Fuel consumption monitor signal

R

T

Lock-up signal

T

R

Hard deceleration signal

T

R

Torque-down signal

T

R

Power mode indicator signal

T

R

A/T fluid temperature warning lamp signal

T

R

R

Current gear position signal

T

R

R

R

R

T

Next gear position signal

T

R

R

Shift change signal

T

R

R

Shift pattern signal

T

R

VDC system control signal

T

R

VDC operation signal

T

R

Stop lamp switch signal

R

T

Steering wheel angle sensor signal

R

T

R

R

Air conditioner switch signal

T

R

AT-30

A/T CONTROL SYSTEM

FOR ICC MODELS
System diagram

Input/output signal chart

T: Transmit   R: Receive

Headlamp switch signal

T

R

Rear window defogger switch signal

T

R

OD cancel switch signal

R

T

R

Brake switch signal

R

T

Power mode switch signal

R

T

Vehicle speed signal

R

R

T

R

T

R

T

R

Signals

TCM

Combination 

meter

Steering angle 

sensor

VDC/TCS/ABS 

control unit

ECM

SKIA3763E

Signals

TCM

Combina-

tion meter

Steering 

angle 

sensor

ICC unit

ICC sen-

sor

VDC/

TCS/ABS 

control 

unit

ECM

ICC system display signal

R

T

ICC sensor signal

R

T

Engine speed signal

R

R

R

R

T

Engine coolant temperature signal

R

R

T

Accelerator pedal position signal

R

R

T

Engine torque signal

R

R

T

Battery voltage signal

R

T

Closed throttle position signal

R

R

T

Lock-up prohibition signal

R

T

Torque-down permission signal

R

T

Fuel consumption monitor signal

R

T

Lock-up signal

T

R

Hard deceleration signal

T

R

Torque-down signal

T

R

Power mode indicator signal

T

R

A/T fluid temperature warning lamp signal

T

R

R

Current gear position signal

T

R

R

R

R

T

Next gear position signal

T

R

R

Shift change signal

T

R

R

A/T CONTROL SYSTEM

AT-31

D

E

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A

B

AT

Input/Output Signal of TCM

ECS0082S

Shift pattern signal

T

R

R

VDC system control signal

T

R

VDC operation signal

R

T

R

Stop lamp switch signal

R

T

Steering wheel angle sensor signal

R

T

R

R

Air conditioner switch signal

T

R

Headlamp switch signal

T

R

Rear window defogger switch signal

T

R

OD cancel switch signal

R

T

R

Brake switch signal

R

T

Power mode switch signal

R

T

Vehicle speed signal

R

R

R

T

R

T

R

T

R

R

Signals

TCM

Combina-

tion meter

Steering 

angle 

sensor

ICC unit

ICC sen-

sor

VDC/

TCS/ABS 

control 

unit

ECM

Control item

Line

pressure

control

Vehicle 

speed 

control

Shift     

control

Lock-up 

control

Engine 

brake 

control

Fail-safe 

function 

(*3)

Self-diag-

nostics 

function

Input

Accelerator pedal position signal 

(*5)

X

X

X

X

X

X

X

Vehicle speed sensor A/T
(revolution sensor)

X

X

X

X

X

X

Vehicle speed sensor MTR

(*1) (*5)

X

X

X

X

X

Closed throttle position signal

(*5)

(*2) X

(*2) X

X

(*2) X

(*4) X

Wide-open throttle position signal

(*5)

(*2) X

(*2) X

(*4) X

Turbine revolution sensor 1

X

X

X

X

Turbine revolution sensor 2
(for 4th speed only)

X

X

X

X

Engine speed signals

(*5)

X

X

PNP  switch

X

X

X

X

X

X

(*4)  X

Stop lamp switch signal

(*5)

X

X

(*4)  X

A/T  fluid  temperature  sensors  1,  2

X

X

X

X

X

X

ASCD or ICC

Operation signal

(*5)

X

X

X

X

Overdrive cancel 

signal

(*5)

X

X

X

TCM power supply voltage signal

X

X

X

X

X

X

X

AT-32

A/T CONTROL SYSTEM

*1: Spare for vehicle speed sensor·A/T (revolution sensor)
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kind of error.
*5: Input by CAN communications.
*6: Output by CAN communications.

Line Pressure Control

ECS0082T

When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the
TCM controls the line pressure solenoid.

This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the
pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the
driving state.

LINE PRESSURE CONTROL IS BASED ON THE TCM LINE PRESSURE CHARACTERISTIC 
PATTERN 

The TCM has stored in memory a number of patterns for the optimum line pressure characteristic for the
driving state.

In order to obtain the most appropriate line pressure characteristic to meet the current driving state, the
TCM controls the line pressure solenoid current valve and thus controls the line pressure.

Out-
put

Direct clutch solenoid (ATF pressure 
switch 5)

X

X

X

X

Input clutch solenoid (ATF pressure 
switch 3)

X

X

X

X

High and low reverse clutch solenoid 
(ATF pressure switch 6)

X

X

X

X

Front brake solenoid (ATF pressure 
switch 1)

X

X

X

X

Low coast brake solenoid (ATF pres-
sure switch 2)

X

X

X

X

X

Line pressure solenoid

X

X

X

X

X

X

X

TCC solenoid

X

X

X

Self-diagnostics table

(*6)

X

Control item

Line

pressure

control

Vehicle 

speed 

control

Shift     

control

Lock-up 

control

Engine 

brake 

control

Fail-safe 

function 

(*3)

Self-diag-

nostics 

function

PCIA0007E

 

 

 

 

 

 

 

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