Infiniti F50. Instruction - page 36
A/T CONTROL SYSTEM
AT-29
D
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L
M
A
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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
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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