Nissan Titan A60. Manual - part 909

TM-24

< SYSTEM DESCRIPTION >

A/T CONTROL SYSTEM

Column Shift Models

CAN Communication

INFOID:0000000006159231

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 details, refer to 

LAN-50,

"CAN System Specification Chart"

.

JSDIA1986GB

A/T CONTROL SYSTEM

TM-25

< SYSTEM DESCRIPTION >

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Input/Output Signal of TCM

INFOID:0000000006159232

*1: Spare for output speed 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: CAN communications.
*5: Used as a condition for starting self-diagnostics; If self-diagnostics are not started, it is judged that there is some kind of error.

Line Pressure Control

INFOID:0000000006159233

• 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.

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 

(*4)

X

X

X

X

X

X

X

Output speed sensor

X

X

X

X

X

X

Vehicle speed signal

(*1) (*4)

X

X

X

X

X

Closed throttle position signal

(*4)

(*2) X

(*2) X

X

(*2) X

(*5) X

Wide open throttle position signal

(*4)

(*2) X

(*2) X

(*2) X

(*5) X

Input speed sensor 1

X

X

X

X

X

Input speed sensor 2
(for 4th speed only)

X

X

X

X

X

Engine speed signals

(*4)

X

X

Transmission  range  switch

X

X

X

X

X

X

X

Stop lamp switch signal

(*4)

X

X

X

(*5)  X

A/T fluid temperature sensor

X

X

X

X

X

X

X

ASCD

Operation signal

(*4)

X

X

X

X

Overdrive cancel sig-
nal

(*4)

X

X

X

TCM power supply voltage signal

X

X

X

X

X

X

Out-
put

Direct clutch solenoid

X

X

X

X

Input clutch solenoid

X

X

X

X

High and low reverse clutch sole-
noid

X

X

X

X

Front brake solenoid

X

X

X

X

Low coast brake solenoid (ATF 
pressure switch 2)

X

X

X

X

X

Line pressure solenoid

X

X

X

X

X

X

X

TCC solenoid

X

X

X

Starter relay

X

X

TM-26

< SYSTEM DESCRIPTION >

A/T CONTROL SYSTEM

• This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pres-

sure 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 PAT-
TERN 

• 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 value and thus controls the line pressure.

Normal Control

Each clutch is adjusted to the necessary pressure to match the

engine drive force.

Back-up Control (Engine Brake)

When the select operation is performed during driving and the trans-

mission is shifted down, the line pressure is set according to the

vehicle speed.

During Shift Change

PCIA0007E

PCIA0008E

PCIA0009E

A/T CONTROL SYSTEM

TM-27

< SYSTEM DESCRIPTION >

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The necessary and adequate line pressure for shift change is set.

For this reason, line pressure pattern setting corresponds to input

torque and gearshift selection. Also, line pressure characteristic is

set according to engine speed, during engine brake operation.

At Low Fluid Temperature

When the A/T fluid temperature drops below the prescribed tempera-

ture, in order to speed up the action of each friction element, the line

pressure is set higher than the normal line pressure characteristic.

Shift Control

INFOID:0000000006159234

The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the

clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes

possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-

teristic is attained.

SHIFT CHANGE 

The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-

tion, etc.

Shift Change System Diagram

PCIA0010E

PCIA0011E

PCIA0012E