2000 NISSAN PATROL torque

AUTOMATIC TRANSMISSION
SECTION
AT
CONTENTS
PREPARATION AND PRECAUTIONS............... 1003
Special Service Tools ...................................... 1003
Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº ... 1004
Precautions ...................................................... 1004
Service Notice or Precautions ......................... 1006
OVERALL SYSTEM............................................ 1007
A/T Electrical Parts Location ........................... 1007
Circuit Diagram ................................................ 1008
Wiring Diagram Ð A/T Ð ................................ 1009
Cross-sectional View ....................................... 1022
Hydraulic Control Circuits ................................ 1023
Shift Mechanism .............................................. 1024
Control System ................................................ 1026
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION..................................................... 1028
Self-diagnosis................................................... 1028
Diagnosis by CONSULT-II ............................... 1034
TROUBLE DIAGNOSIS Ð Introduction............ 1036
Introduction ...................................................... 1036
Diagnostic Worksheet ...................................... 1037
Work Flow ........................................................ 1040
TROUBLE DIAGNOSIS Ð Basic Inspection.... 1041
A/T Fluid Check ............................................... 1041
Stall Test .......................................................... 1041
Line Pressure Test........................................... 1044
Road Test ........................................................ 1046
TROUBLE DIAGNOSIS Ð General
Description.......................................................... 1057
Symptom Chart ................................................ 1057
TCM Terminals and Reference Value ............. 1060
TROUBLE DIAGNOSIS FOR VHCL SPEED
SENzA/T................................................................ 1064Vehicle Speed SensorzA/T (Revolution
sensor) ............................................................. 1064
TROUBLE DIAGNOSIS FOR VHCL SPEED
SENzMTR.............................................................. 1066
Vehicle Speed SensorzzMTR ............................ 1066
TROUBLE DIAGNOSIS FOR THROTTLE POSI
SEN...................................................................... 1068
Accelerator Position Sensor ............................ 1068
TROUBLE DIAGNOSIS FOR SHIFT
SOLENOID/V A.................................................... 1070
Shift Solenoid Valve A ..................................... 1070
TROUBLE DIAGNOSIS FOR SHIFT
SOLENOID/V B.................................................... 1072
Shift Solenoid Valve B ..................................... 1072
TROUBLE DIAGNOSIS FOR OVERRUN
CLUTCH S/V........................................................ 1074
Overrun Clutch Solenoid Valve ....................... 1074
TROUBLE DIAGNOSIS FOR T/C CLUTCH
SOL/V................................................................... 1076
Torque Converter Clutch Solenoid Valve ........ 1076
TROUBLE DIAGNOSIS FOR BATT/FLUID
TEMP SEN........................................................... 1079
A/T Fluid Temperature Sensor and TCM
Power Source .................................................. 1079
TROUBLE DIAGNOSIS FOR ENGINE SPEED
SIG....................................................................... 1082
Engine Speed Signal ....................................... 1082
TROUBLE DIAGNOSIS FOR LINE PRESSURE
S/V........................................................................ 1084
Line Pressure Solenoid Valve ......................... 1084
TROUBLE DIAGNOSIS FOR CONTROL UNIT
(RAM), CONTROL UNIT (ROM)......................... 1087
Description ....................................................... 1087

AT

Special Service Tools
Tool number
Tool nameDescription
ST2505S001
Oil pressure gauge set
V1ST25051001
Oil pressure gauge
V2ST25052000
Hose
V3ST25053000
Joint pipe
V4ST25054000
Adapter
V5ST25055000
Adapter
NT097
Measuring line pressure
KV31101201
Oil pressure gauge
adapter
NT093
Measuring line pressure
ST07870000
Transmission case
stand
NT421
Disassembling and assembling
A/T
a: 182 mm (7.17 in)
b: 282 mm (11.10 in)
c: 230 mm (9.06 in)
d: 100 mm (3.94 in)
KV31102100
Torque converter one-
way clutch check tool
NT098
Checking one-way clutch in
torque converter
ST25850000
Sliding hammer
NT422
Removing oil pump assembly
a: 179 mm (7.05 in)
b: 70 mm (2.76 in)
c: 40 mm (1.57 in) dia.
d: M12 x 1.75P
ST33200000
Drift
NT091
Installing oil pump housing
oil seal
a: 60 mm (2.36 in) dia.
b: 44.5 mm (1.752 in) dia.
ST30720000
Drift
NT115
Installing rear oil seal
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.185 in) dia.
PREPARATION AND PRECAUTIONS
AT-1003

+Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
+After overhaul, refill the transmission with new ATF.
+When the A/T drain plug is removed, only some of the fluid is drained. Old A/T fluid will remain in torque
converter and ATF cooling system.
Always follow the procedures under ªChanging A/T Fluidº in the MA section when changing A/T fluid.
PREPARATION AND PRECAUTIONS
Precautions (Cont'd)
AT-1005

Shift Mechanism
The automatic transmission uses compact, dual planetary gear systems to improve power-transmission
efficiency, simplify construction and reduce weight.
It also employs an optimum shift control and superwide gear ratios. They improve starting performance and
acceleration during medium and high-speed operation.
Two one-way clutches are also employed: one is used for the forward clutch and the other for the low clutch.
These one-way clutches, combined with four accumulators, reduce shifting shock to a minimum.
CONSTRUCTION
V1Torque converter clutch piston
V2Torque converter
V3Oil pump
V4Input shaft
V5Brake band
V6Reverse clutch
V7High clutch
V8Front pinion gear
V9Front sun gear
V10Front internal gear
V11Front planetary carrier
V12Rear sun gear
V13Rear pinion gear
V14Rear internal gear
V15Rear planetary carrier
V16Forward clutch
V17Forward one-way clutch
V18Overrun clutch
V19Low one-way clutch
V20Low & reverse brake
V21Parking pawl
V22Parking gear
V23Output shaft
FUNCTION OF CLUTCH AND BRAKE
Control members Abbr. Function
V6Reverse clutch R/C To transmit input power to front sun gearV9.
V7High clutch H/C To transmit input power to front planetary carrierV11.
V16Forward clutch F/C To connect front planetary carrierV11with forward one-way clutchV17.
V18Overrun clutch O/C To connect front planetary carrierV11with rear internal gearV14.
V5Brake band B/B To lock front sun gearV9.
V17Forward one-way clutch F/O.CWhen forward clutch is engaged, to stop rear internal gearV14from rotating in oppo-
site direction.
V19Low one-way clutch L/O.C At D1position, to prevent rear internal gearV14from rotating in opposite direction.
V20Low & reverse brake L & R/BTo lock rear internal gearV14(2, 12and 11), to lock front planetary carrierV11(R
position).
SAT509I
OVERALL SYSTEM
AT-1024

Control System
OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors. It always controls
the optimum shaft position and reduces shifting and lock-up shocks.
SENSORSTCMACTUATORS
PNP switch
Accelerator position sensor
Accelerator position switch
(Full accel, off accel position
switch)
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed sensor
Overdrive control switch
A/T mode switch
c
Shift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
Duet-EU control
CONSULT-II communication line
control
c
Shift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch
solenoid valve
Line pressure solenoid valve
SPORT indicator lamp
CONTROL SYSTEM
SAT207K
OVERALL SYSTEM
AT-1026

TCM FUNCTION
The function of the TCM is to:
+Receive input signals sent from various switches and sensors.
+Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
+Send required output signals to the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
Sensors and solenoid valves Function
InputPNP switch Detects select lever position and sends a signal to TCM.
Accelerator position sensor Detects throttle valve position and sends a signal to TCM.
Accelerator position switch
(Off accel)Detects throttle valve's fully-closed position and sends a signal to TCM.
Accelerator position switch
(Full accel)Detects a throttle valve position of greater than 1/2 of full throttle and sends a
signal to TCM.
Engine speed signal From ECM.
A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM.
Revolution sensor Detects output shaft rpm and sends a signal to TCM.
Vehicle speed sensorUsed as an auxiliary vehicle speed sensor. Sends a signal when revolution sen-
sor (installed on transmission) malfunctions.
Overdrive control switch
A/T mode switchSends a signal, which prohibits a shift to ªD
4º (overdrive) position, to the TCM.
OutputShift solenoid valve A/BSelects shifting point suited to driving conditions in relation to a signal sent from
TCM.
Line pressure solenoid valveRegulates (or decreases) line pressure suited to driving conditions in relation to
a signal sent from TCM.
Torque converter clutch solenoid valveRegulates (or decreases) lock-up pressure suited to driving conditions in relation
to a signal sent from TCM.
Overrun clutch solenoid valveControls an ªengine brakeº effect suited to driving conditions in relation to a sig-
nal sent from TCM.
O/D OFF indicator lamp
SPORT indicator lampShows TCM faults, when A/T control components malfunction.
OVERALL SYSTEM
Control System (Cont'd)
AT-1027

JUDGEMENT OF SELF-DIAGNOSIS CODE
SPORT indicator lamps:*1
All judgement flickers are same.
SAT819H
All circuits that can be confirmed by self-diagnosis are OK.
4th judgement flicker is longer than others.
SAT797HShift solenoid valve A circuit is short-circuited or discon-
nected.
Go to SHIFT SOLENOID VALVE A, AT-1070.
1st judgement flicker is longer than others.
SAT794H
Revolution sensor circuit is short-circuited or disconnected.
Go to VEHICLE SPEED SENSORzA/T (REVOLUTION
SENSOR), AT-1064.
5th judgement flicker is longer than others.
SAT798H
Shift solenoid valve B circuit is short-circuited or discon-
nected.
Go to SHIFT SOLENOID VALVE B, AT-1072.
2nd judgement flicker is longer than others.
SAT795H
Vehicle speed sensor circuit is short-circuited or discon-
nected.
Go to VEHICLE SPEED SENSORzMTR, AT-1066.
6th judgement flicker is longer than others.
SAT799H
Overrun clutch solenoid valve circuit is short-circuited or dis-
connected.
Go to OVERRUN CLUTCH SOLENOID VALVE, AT-1074.
3rd judgement flicker is longer than others.
SAT796H
Throttle (accelerator) position sensor circuit is short-circuited
or disconnected.
Go to ACCELERATOR POSITION SENSOR, AT-1068.
7th judgement flicker is longer than others.
SAT800H
Torque converter clutch solenoid valve circuit is short-cir-
cuited or disconnected.
Go to TORQUE CONVERTER CLUTCH SOLENOID
VALVE, AT-1076.
t1= 2.5 seconds t2= 2.0 seconds t3= 1.0 second
*1: Refer to applicable indicator lamps for specified areas on next page.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-1031

Item DisplayMonitor item
Description Remarks TCM
input
signalsMain
signals
1 position switch 1 POSITION SW
[ON/OFF] X Ð+ON/OFF status, computed from
signal of 1 position SW, is dis-
played.
ASCD-cruise signal ASCD-CRUISE
[ON/OFF]
XÐ+Status of ASCD cruise signal is
displayed.
ON ... Cruising state
OFF ... Normal running state+This is displayed even when no
ASCD is mounted.
ASCD-OD cut signal ASCD-OD CUT
[ON/OFF]
XÐ+Status of ASCDzOD release
signal is displayed.
ON ... OD released
OFF ... OD not released+This is displayed even when no
ASCD is mounted.
Kickdown switch KICKDOWN SW
[ON/OFF] X Ð+ON/OFF status, computed from
signal of kickdown SW, is dis-
played.+This is displayed even when no
kickdown switch is equipped.
A/T mode switch POWER SHIFT SW
[ON/OFF] X Ð+ON/OFF state computed from
signal of POWER shift SW is
displayed.
Closed throttle position switch CLOSED THL/SW
[ON/OFF]
XÐ+ON/OFF status, computed from
signal of closed throttle (accel-
erator) position SW, is dis-
played.
Wide open throttle position switch W/O THRL/P-SW
[ON/OFF]
XÐ+ON/OFF status, computed from
signal of wide open throttle
(accelerator) position SW, is
displayed.
A/T mode switch HOLD SW
[ON/OFF] X Ð+ON/OFF status, computed from
signal of HOLD shift SW, is
displayed.
Gear position GEAR
ÐX+Gear position data used for
computation by TCM, is dis-
played.
Selector lever position SLCT LVR POSI
ÐX+Selector lever position data,
used for computation by TCM,
is displayed.+A specific value used for con-
trol is displayed if fail-safe is
activated due to error.
Vehicle speed VEHICLE SPEED
[km/h] or [mph] Ð X+Vehicle speed data, used for
computation by TCM, is dis-
played.
Accelerator position THROTTLE POSI
[/8] Ð X+Throttle (accelerator) position
data, used for computation by
TCM, is displayed.+A specific value used for con-
trol is displayed if fail-safe is
activated due to error.
Line pressure duty LINE PRES DTY
[%]
ÐX+Control value of line pressure
solenoid valve, computed by
TCM from each input signal, is
displayed.
Torque converter clutch solenoid
valve dutyTCC S/V DUTY
[%]
ÐX+Control value of torque con-
verter clutch solenoid valve,
computed by TCM from each
input signal, is displayed.
Shift solenoid valve A SHIFT S/V A
[ON/OFF]
ÐX+Control value of shift solenoid
valve A, computed by TCM
from each input signal, is dis-
played.Control value of solenoid is dis-
played even if solenoid circuit is
disconnected.
The ªOFFº signal is displayed if
solenoid circuit is shorted.
Shift solenoid valve B SHIFT S/V B
[ON/OFF]
ÐX+Control value of shift solenoid
valve B, computed by TCM
from each input signal, is dis-
played.
Overrun clutch solenoid valve OVERRUN/C S/V
[ON/OFF]
ÐX+Control value of overrun clutch
solenoid valve computed by
TCM from each input signal is
displayed.
Self-diagnosis display lamp
(SPORT indicator lamp)SELF-D DP LMP
[ON/OFF]ÐX+Control status of SPORT indi-
cator lamp is displayed.
X: Applicable
Ð: Not applicable
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Diagnosis by CONSULT-II (Cont'd)
AT-1035