2003 NISSAN X-TRAIL Electronic Repair Manual

fuel tank capacity battery replacement start stop button child lock night vision buttons

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Page 33 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual OVERALL SYSTEM
AT-27
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Control SystemECS004QE
OUTLINE
The automatic transaxle senses vehicle operating conditions through various switches and sensors. It always
controls the o

Page 34 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-28
OVERALL SYSTEM
CONTROL SYSTEM
TCM FUNCTION
ThefunctionoftheTCMisto:
lReceive input signals sent from various switches and sensors.
lDetermine required line pressure, shifting point, lock-up oper

Page 35 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual OVERALL SYSTEM
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Control MechanismECS004QF
LINE PRESSURE CONTROL
TCM has various line pressure control characteristics to match the driving conditions.
An ON-OFF duty sig

Page 36 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-30
OVERALL SYSTEM
At Low Fluid Temperature
lFluid viscosity and frictional characteristics of the clutch facing change with fluid temperature. Clutch
engaging or band-contacting pressure is compens

Page 37 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual OVERALL SYSTEM
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Control of Shift Valves A and B
Pilot pressure generated by the operation of shift solenoid valves A and B is applied to the end face of shift
valves A a

Page 38 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-32
OVERALL SYSTEM
The torque converter clutch piston is designed to slip to adjust the
ratio of ON-OFF, thereby reducing lock-up shock.
OFF-time INCREASING
¯
Amount of drain DECREASING
¯
Pilot pr

Page 39 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual OVERALL SYSTEM
AT-33
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Overrun Clutch Solenoid Valve Control
TheoverrunclutchsolenoidvalveisoperatedbyanON-OFFsignal
transmitted by the TCM to provide overrun clutch control (e

OVERALL SYSTEM
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Overrun Clutch Solenoid Valve Control
TheoverrunclutchsolenoidvalveisoperatedbyanON-OFFsignal
transmitted by the TCM to provide overrun clutch control (engine
brake control).
When this solenoid valve is “ON”, the pilot pressure drain port
closes. When it is “OFF”, the drain port opens.
During the solenoid valve “ON” pilot pressure is applied to the end
face of the overrun clutch control valve.
Overrun Clutch Control Valve Operation
When the solenoid valve is “ON”, pilot pressure is applied to the
overrun clutch control valve. This pushes up the overrun clutch con-
trol valve. The line pressure is then shut off so that the clutch does
not engage.
When the solenoid valve is “OFF”, pilot pressure is not generated. At
this point, the overrun clutch control valve moves downward by
spring force. As a result, overrun clutch operation pressure is pro-
vided by the overrun clutch reducing valve. This causes the overrun
clutch to engage.
In the 1 position, the overrun clutch control valve remains pushed
down so that the overrun clutch is engaged at all times.
Control ValveECS004QG
FUNCTION OF CONTROL VALVES
SAT015J
SAT016J
Valve name Function
Pressure regulator valve, plug
and sleeveRegulates oil discharged from the oil pump to provide optimum line pressure for all driving condi-
tions.
Pressure modifier valve and
sleeveUsed as a signal supplementary valve to the pressure regulator valve. Regulates pressure-modi-
fier pressure (signal pressure) which controls optimum line pressure for all driving conditions.
Pilot valve Regulates line pressure to maintain a constant pilot pressure level which controls lock-up mecha-
nism, overrun clutch, shift timing.
Accumulator control valve Regulates accumulator back-pressure to pressure suited to driving conditions.
Manual valve Directs line pressure to oil circuits corresponding to select positions.
Hydraulic pressure drains when the shift lever is in Neutral.
Shift valve A Simultaneously switches four oil circuits using output pressure of shift solenoid valve A to meet
driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and up-shifting (1st®2nd®3rd®4th gears/4th®3rd®2nd
®1st gears) in combination with shift valve B.
Shift valve B Simultaneously switches three oil circuits using output pressure of shift solenoid valve B in rela-
tion to driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and up-shifting (1st®2nd®3rd®4th gears/4th®3rd®2nd
®1st gears) in combination with shift valve A.

Page 40 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-34
OVERALL SYSTEM
Overrun clutch control valve Switches hydraulic circuits to prevent engagement of the overrun clutch simultaneously with appli-
cation of the brake band in D
4. (Interlocking occu

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