o2 sensor NISSAN ALMERA 2001 Service Manual

AUTOMATIC TRANSAXLE
SECTION
AT
CONTENTS
EURO-OBD
TROUBLE DIAGNOSIS - INDEX....................................5
Alphabetical & P No. Index for DTC ...........................5
PRECAUTIONS...............................................................7
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²...............7
Precautions for On Board Diagnostic (EURO-
OBD) System of A/T and Engine - Euro-OBD - ..........7
Precautions ..................................................................7
Service Notice or Precautions .....................................9
Wiring Diagrams and Trouble Diagnosis ...................10
PREPARATION............................................................. 11
Special Service Tools ................................................ 11
Commercial Service Tools .........................................13
A/T FLUID......................................................................15
Checking A/T Fluid ....................................................15
Changing A/T Fluid ....................................................15
OVERALL SYSTEM......................................................16
A/T Electrical Parts Location .....................................16
Circuit Diagram ..........................................................17
Cross-sectional View - 3AX00, 3AX01, 3AX19,
3AX63 and 3AX64 models ........................................19
Cross-sectional View - 3AX10 and 3AX18
models .......................................................................20
Hydraulic Control Circuit ............................................21
Shift Mechanism ........................................................22
Control System ..........................................................31
Control Mechanism ....................................................32
Control Valve .............................................................37
EXCEPT FOR EURO-OBD
ON BOARD DIAGNOSTIC............................................39
CONSULT-II ...............................................................39
Diagnostic Procedure Without CONSULT-II ..............44EURO-OBD
ON BOARD DIAGNOSTIC SYSTEM............................50
Introduction ................................................................50
EURO-OBD Function for A/T System .......................50
One or Two Trip Detection Logic of EURO-OBD ......50
EURO-OBD Diagnostic Trouble Code (DTC)............50
Malfunction Indicator (MI) ..........................................54
CONSULT-II ...............................................................54
Diagnostic Procedure Without CONSULT-II ..............63
EXCEPT FOR EURO-OBD
TROUBLE DIAGNOSIS -...............................................69
Introduction ................................................................69
Work Flow ..................................................................73
EURO-OBD
TROUBLE DIAGNOSIS - INTRODUCTION..................74
Introduction ................................................................74
Work Flow ..................................................................78
TROUBLE DIAGNOSIS - BASIC INSPECTION...........80
A/T Fluid Check .........................................................80
Stall Test ....................................................................80
Line Pressure Test .....................................................84
Road Test...................................................................85
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION.............................................................105
Symptom Chart ........................................................105
TCM Terminals and Reference Value...................... 118
TROUBLE DIAGNOSIS FOR POWER SUPPLY........123
Wiring Diagram - AT - MAIN ....................................123
Diagnostic Procedure ..............................................124
EXCEPT FOR EURO-OBD
VEHICLE SPEED SENSOR.A/T..................................126

Description ...............................................................126
Wiring Diagram - AT - VSSA/T ................................128
Diagnostic Procedure ..............................................129
VHCL SPEED SEN.MTR VEHICLE............................131
Description ...............................................................131
Wiring Diagram - AT - VSSMTR ..............................132
Diagnostic Procedure ..............................................133
THROTTLE POSITION................................................134
Description ...............................................................134
Wiring Diagram - AT - TPS ......................................136
Diagnostic Procedure ..............................................137
Component Inspection .............................................141
SHIFT SOLENOID VALVE A......................................142
Description ...............................................................142
Wiring Diagram - AT - SSV/A ..................................144
Diagnostic Procedure ..............................................145
Component Inspection .............................................147
SHIFT SOLENOID VALVE B......................................148
Description ...............................................................148
Wiring Diagram - AT - SSV/B ..................................150
Diagnostic Procedure ..............................................151
Component Inspection .............................................153
OVERRUN CLUTCH SOLENOID................................154
Description ...............................................................154
Wiring Diagram - AT - OVRCSV..............................155
Diagnostic Procedure ..............................................156
Component Inspection .............................................158
TORQUE CONVERTER CLUTCH...............................159
Description ...............................................................159
Wiring Diagram - AT - TCV......................................161
Diagnostic Procedure ..............................................162
Component Inspection .............................................164
BATT/FLUID TEMP SEN (A/T FLUID TEMP
SENSOR CIRCUIT AND TCM POWER SOURCE)....165
Description ...............................................................165
Wiring Diagram - AT - BA/FTS ................................167
Diagnostic Procedure ..............................................168
Component Inspection .............................................171
ENGINE SPEED SIGNAL............................................172
Description ...............................................................172
Wiring Diagram - AT - ENGSS ................................173
Diagnostic Procedure ..............................................174
LINE PRESSURE SOLENOID....................................176
Description ...............................................................176
Wiring Diagram - AT - LPSV....................................178
Diagnostic Procedure ..............................................179
Component Inspection .............................................182
EURO-OBD
DTC P0705 PARK/NEUTRAL POSITION (PNP)
SWITCH.......................................................................183
Description ...............................................................183Wiring Diagram - AT - PNP/SW...............................185
Diagnostic Procedure ..............................................186
Component Inspection .............................................188
DTC P0710 A/T FLUID TEMPERATURE SENSOR
CIRCUIT.......................................................................189
Description ...............................................................189
Wiring Diagram - AT - FTS ......................................191
Diagnostic Procedure ..............................................192
Component Inspection .............................................194
DTC P0720 VEHICLE SPEED SENSOR.A/T..............195
Description ...............................................................195
Wiring Diagram - AT - VSSA/T ................................197
Diagnostic Procedure ..............................................198
DTC P0725 ENGINE SPEED SIGNAL.......................200
Description ...............................................................200
Wiring Diagram - AT - ENGSS ................................201
Diagnostic Procedure ..............................................202
DTC P0731 A/T 1ST GEAR FUNCTION....................204
Description ...............................................................204
Wiring Diagram - AT - 1ST ......................................207
Diagnostic Procedure ..............................................208
Component Inspection .............................................209
DTC P0732 A/T 2ND GEAR FUNCTION.................... 211
Description ............................................................... 211
Wiring Diagram - AT - 2ND......................................214
Diagnostic Procedure ..............................................215
Component Inspection .............................................216
DTC P0733 A/T 3RD GEAR FUNCTION....................217
Description ...............................................................217
Wiring Diagram - AT - 3RD......................................220
Diagnostic Procedure ..............................................221
Component Inspection .............................................222
DTC P0734 A/T 4TH GEAR FUNCTION....................223
Description ...............................................................223
Wiring Diagram - AT - 4TH ......................................227
Diagnostic Procedure ..............................................228
Component Inspection .............................................232
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE......................................................233
Description ...............................................................233
Wiring Diagram - AT - TCV......................................235
Diagnostic Procedure ..............................................236
Component Inspection .............................................238
DTC P0745 LINE PRESSURE SOLENOID VALVE...239
Description ...............................................................239
Wiring Diagram - AT - LPSV....................................241
Diagnostic Procedure ..............................................242
Component Inspection .............................................245
DTC P0750 SHIFT SOLENOID VALVE A..................246
Description ...............................................................246
Wiring Diagram - AT - SSV/A ..................................248
Diagnostic Procedure ..............................................249
CONTENTS(Cont'd)
AT-2

Component Inspection .............................................251
DTC P0755 SHIFT SOLENOID VALVE B..................252
Description ...............................................................252
Wiring Diagram - AT - SSV/B ..................................254
Diagnostic Procedure ..............................................255
Component Inspection .............................................257
DTC P1705 THROTTLE POSITION SENSOR...........258
Description ...............................................................258
Wiring Diagram - AT - TPS ......................................261
Diagnostic Procedure ..............................................263
Component Inspection .............................................267
DTC P1760 OVERRUN CLUTCH SOLENOID
VALVE..........................................................................268
Description ...............................................................268
Wiring Diagram - AT - OVRCSV..............................270
Diagnostic Procedure ..............................................271
Component Inspection .............................................273
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP
SENSOR CIRCUIT AND TCM POWER SOURCE)....274
Description ...............................................................274
Wiring Diagram - AT - BA/FTS ................................276
Diagnostic Procedure ..............................................277
Component Inspection .............................................280
DTC VHCL SPEED SEN.MTR VEHICLE SPEED
SENSOR.MTR..............................................................281
Description ...............................................................281
Wiring Diagram - AT - VSSMTR ..............................283
Diagnostic Procedure ..............................................285
DTC CONTROL UNIT (RAM), CONTROL UNIT
(ROM)...........................................................................286
Description ...............................................................286
Diagnostic Procedure ..............................................286
DTC CONTROL UNIT (EEP ROM).............................288
Description ...............................................................288
Diagnostic Procedure ..............................................289
TROUBLE DIAGNOSES FOR SYMPTOMS...............290
Wiring Diagram - AT - NONDTC/General and
Except for Euro-OBD ...............................................290
Wiring Diagram - AT - NONDTC/EURO-OBD .........292
1. O/D OFF Indicator Lamp Does Not Come On....296
2. Engine Cannot Be Started In²P²and²N²
Position ....................................................................299
3. In²P²Position, Vehicle Moves Forward Or
Backward When Pushed .........................................300
4. In²N²Position, Vehicle Moves ...........................301
5. Large Shock.²N²->²R²Position .......................303
6. Vehicle Does Not Creep Backward In²R²
Position ....................................................................305
7. Vehicle Does Not Creep Forward In²D²,²2²
Or²1²Position .........................................................3088. Vehicle Cannot Be Started From D
1................... 311
9. A/T Does Not Shift: D
1-> D2Or Does Not
Kickdown: D
4-> D2..................................................314
10. A/T Does Not Shift: D
2-> D3.............................317
11. A/T Does Not Shift: D
3-> D4.............................320
12. A/T Does Not Perform Lock-up .........................323
13. A/T Does Not Hold Lock-up Condition ..............325
14. Lock-up Is Not Released ...................................327
15. Engine Speed Does Not Return To Idle (Light
Braking D
4-> D3).....................................................328
16. Vehicle Does Not Start From D
1.......................330
17. A/T Does Not Shift: D
4-> D3, When
Overdrive Control Switch²ON²->²OFF²...............331
18. A/T Does Not Shift: D
3-> 22, When Selector
Lever²D²->²2²Position.........................................332
19. A/T Does Not Shift: 2
2-> 11, When Selector
Lever²2²->²1²Position .........................................333
20. Vehicle Does Not Decelerate By Engine
Brake........................................................................334
21. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control and Throttle Position Switches
Circuit Checks) ........................................................334
A/T SHIFT LOCK SYSTEM.........................................343
Description ...............................................................343
Shift Lock System Electrical Parts Location............343
Wiring Diagram - SHIFT -........................................344
Diagnostic Procedure ..............................................345
KEY INTERLOCK CABLE..........................................349
Components.............................................................349
Removal ...................................................................349
Installation ................................................................350
ON-VEHICLE SERVICE..............................................351
Control Valve Assembly and Accumulators .............351
Control Cable Adjustment ........................................352
Park/Neutral Position (PNP) Switch Adjustment .....352
Differential Side Oil Seal Replacement ...................353
Revolution Sensor Replacement .............................353
REMOVAL AND INSTALLATION...............................354
Removal ...................................................................354
Installation ................................................................355
OVERHAUL.................................................................357
Components-1 3AX00, 3AX01, 3AX19, 3AX63
and 3AX64 models ..................................................357
Components-1 3AX10 and 3AX18 models .............358
Components-2 3AX00, 3AX01, 3AX19, 3AX63
and 3AX64 models ..................................................359
Components-2 3AX10 and 3AX18 models .............360
Components-3 3AX00, 3AX01, 3AX19, 3AX63
and 3AX64 models ..................................................361
Components-3 3AX10 and 3AX18 models .............362
Oil Channel ..............................................................363
CONTENTS(Cont'd)
AT-3

Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings - 3AX00, 01,
19, 63 and 64 models..............................................364
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings - 3AX10 and
3AX18 models .........................................................365
DISASSEMBLY............................................................366
REPAIR FOR COMPONENT PARTS.........................381
Manual Shaft............................................................381
Oil Pump ..................................................................384
Control Valve Assembly ...........................................388
Control Valve Upper Body .......................................397
Control Valve Lower Body .......................................401
Reverse Clutch ........................................................403
High Clutch ..............................................................407
Forward Clutch and Overrun Clutch........................412
Low & Reverse Brake..............................................419
Rear Internal Gear, Forward Clutch Hub and
Overrun Clutch Hub .................................................423
O/Shaft, O/Gear, I/Gear, R/Pinion Gear and B/
Retainer - 3AX00, 01, 19, 63 and 64 models .........427
Output Shaft, Idler Gear, Reduction Pinion Gear
and Bearing Retainer - 3AX10 and 3AX18
models .....................................................................432
Band Servo Piston Assembly ..................................437
Final Drive................................................................442
ASSEMBLY..................................................................446
Assembly (1) ............................................................446
Adjustment (1) .........................................................447
Assembly (2) ............................................................455Adjustment (2) .........................................................459
Assembly (3) ............................................................462
Assembly (4) ............................................................465
SERVICE DATA AND SPECIFICATIONS (SDS).......470
General Specifications .............................................470
Shift Schedule..........................................................470
Stall Revolution ........................................................473
Line Pressure...........................................................473
Control Valves..........................................................474
Clutch and Brakes ...................................................474
Clutch and Brake Return Springs............................477
Oil Pump ..................................................................477
Input Shaft ...............................................................478
Planetary Carrier......................................................478
Final Drive................................................................478
Reduction Pinion Gear ............................................480
Output Shaft - 3AX00, 3AX01, 3AX19, 3AX63
and 3AX64 models ..................................................481
Output Shaft - 3AX10 and 3AX18 models ..............483
Bearing Retainer ......................................................484
Total End Play..........................................................484
Reverse Clutch End Play ........................................484
Accumulator .............................................................484
Band Servo ..............................................................485
Removal and Installation .........................................485
Shift Solenoid Valves ...............................................485
Resistance ...............................................................485
ATF Temp. Sensor ...................................................485
Revolution Sensor ...................................................485
Dropping Resistor ....................................................485
CONTENTS(Cont'd)
AT-4

Alphabetical & P No. Index for DTCNJAT0243ALPHABETICAL INDEX FOR DTCNJAT0243S01Check if the vehicle is a model with Euro-OBD system or not by the
ªType approval numberº on the identification plate. Refer to GI-40,
ªIDENTIFICATION PLATEº.
Type approval number Model
Available With Euro-OBD system
Not available (blank) Without Euro-OBD system
Items
(CONSULT-II screen terms)DTC
Reference page
CONSULT-II
GST*1
A/T 1ST GR FNCTN P0731 AT-204
A/T 2ND GR FNCTN P0732 AT-211
A/T 3RD GR FNCTN P0733 AT-217
A/T 4TH GR FNCTN P0734 AT-223
ATF TEMP SEN/CIRC P0710 AT-189
ENGINE SPEED SIG P0725 AT-200
L/PRESS SOL/CIRC P0745 AT-239
O/R CLTCH SOL/CIRC P1760 AT-268
PNP SW/CIRC P0705 AT-183
SFT SOL A/CIRC*2 P0750 AT-246
SFT SOL B/CIRC*2 P0755 AT-252
TCC SOLENOID/CIRC P0740 AT-233
TP SEN/CIRC A/T*2 P1705 AT-258
VEH SPD SEN/CIR AT*3 P0720 AT-195
*1: These numbers are prescribed by SAE J2012.
*2: When the fail-safe operation occurs, the MIL illuminates.
*3: The MIL illuminates when both the ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at
the same time.
TROUBLE DIAGNOSIS Ð INDEXEURO-OBD
Alphabetical & P No. Index for DTC
AT-5

P NO. INDEX FOR DTC=NJAT0243S02Check if the vehicle is a model with Euro-OBD system or not by the
ªType approval numberº on the identification plate. Refer to GI-40,
ªIDENTIFICATION PLATEº.
Type approval number Model
Available With Euro-OBD system
Not available (blank) Without Euro-OBD system
DTC
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*1
P0705 PNP SW/CIRC AT-183
P0710 ATF TEMP SEN/CIRC AT-189
P0720 VEH SPD SEN/CIR AT*3 AT-195
P0725 ENGINE SPEED SIG AT-200
P0731 A/T 1ST GR FNCTN AT-204
P0732 A/T 2ND GR FNCTN AT-211
P0733 A/T 3RD GR FNCTN AT-217
P0734 A/T 4TH GR FNCTN AT-223
P0740 TCC SOLENOID/CIRC AT-233
P0745 L/PRESS SOL/CIRC AT-239
P0750 SFT SOL A/CIRC*2 AT-246
P0755 SFT SOL B/CIRC*2 AT-252
P1705 TP SEN/CIRC A/T*2 AT-258
P1760 O/R CLTCH SOL/CIRC AT-268
*1: These numbers are prescribed by SAE J2012.
*2: When the fail-safe operation occurs, the MIL illuminates.
*3: The MIL illuminates when both the ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at
the same time.
TROUBLE DIAGNOSIS Ð INDEXEURO-OBD
Alphabetical & P No. Index for DTC (Cont'd)
AT-6

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NJAT0249The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL N16 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnosis sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
Precautions for On Board Diagnostic (EURO-
OBD) System of A/T and Engine Ð Euro-OBD
Ð
NJAT0245The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
+Be sure to turn the ignition switch ªOFFº and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MIL to light up.
+Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to an open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
+Be sure to route and secure the harnesses properly after work. Interference of the harness with a
bracket, etc. may cause the MIL to light up due to a short circuit.
+Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to a malfunction of the EGR system or fuel injection system,
etc.
+Be sure to erase the unnecessary malfunction information (repairs completed) from the TCM and
ECM before returning the vehicle to the customer.
SEF289H
PrecautionsNJAT0246+Before connecting or disconnecting the TCM harness
connector, turn ignition switch OFF and disconnect nega-
tive battery terminal. Failure to do so may damage the
TCM. Because battery voltage is applied to TCM even if
ignition switch is turned off.
PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
AT-7

parts. Apply petroleum jelly to protect O-rings and seals, or
hold bearings and washers in place during assembly. Do not
use grease.
+Extreme care should be taken to avoid damage to O-rings,
seals and gaskets when assembling.
+After overhaul, refill the transaxle 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
AT section when changing A/T fluid. Refer to ªChanging A/T
Fluidº, AT-15.
Service Notice or PrecautionsNJAT0247FAIL-SAFENJAT0247S01The TCM has an electronic Fail-Safe (limp home mode). This allows the vehicle to be driven even if a major
electrical input/output device circuit is damaged.
Under Fail-Safe, the vehicle always runs in third gear, even with a shift lever position of ª1º, ª2º or ªDº. The
customer may complain of sluggish or poor acceleration.
When the ignition key is turned ªONº following Fail-Safe operation, O/D OFF indicator lamp blinks for about
8 seconds. (For GENERAL AND EXCEPT FOR EURO-OBD; ªSELF-DIAGNOSTIC PROCEDURE (WITHOUT
CONSULT-II)º, refer to AT-44 and for EURO-OBD; ªTCM SELF-DIAGNOSTIC PROCEDURE (No Tools)º, refer
to AT-63.)
Fail-Safe may occur without electrical circuit damage if the vehicle is driven under extreme conditions (such
as excessive wheel spin followed by sudden braking). To recover normal shift pattern, turn the ignition key
ªOFFº for 5 seconds, then ªONº.
The blinking of the O/D OFF indicator lamp for about 8 seconds will appear only once and be cleared. The
customer may resume normal driving conditions.
Always follow the ªWORK FLOWº [Refer to AT-73 (General and except for Euro-OBD), AT-78 (EURO-OBD).]
The SELF-DIAGNOSIS results will be as follows:
The first SELF-DIAGNOSIS will indicate damage to the vehicle speed sensor or the revolution sensor.
During the next SELF-DIAGNOSIS, performed after checking the sensor, no damages will be indicated.
TORQUE CONVERTER SERVICENJAT0247S02The torque converter should be replaced under any of the following conditions:
+External leaks in the hub weld area.
+Converter hub is scored or damaged.
+Converter pilot is broken, damaged or fits poorly into crankshaft.
+Steel particles are found after flushing the cooler and cooler lines.
+Pump is damaged or steel particles are found in the converter.
+Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses
have been made. (Converter clutch material may be glazed.)
+Converter is contaminated with engine coolant containing antifreeze.
+Internal failure of stator roller clutch.
+Heavy clutch debris due to overheating (blue converter).
+Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged Ð indicates that lining material came from converter.
PRECAUTIONS
Precautions (Cont'd)
AT-9

Control System=NJAT0014OUTLINENJAT0014S01The automatic transaxle senses vehicle operating conditions through various switches and sensors. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
SWITCHES & SENSORS
cTCM
cACTUATORS
PNP switch
Throttle position sensor
Closed throttle position switch
Wide open throttle position
switch
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed sensor
Overdrive control switch
Stop lamp switchShift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
control
Duet-EA controlShift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
O/D OFF indicator lamp
CONTROL SYSTEMNJAT0014S02
SAT995J
OVERALL SYSTEM
Control System
AT-31

TCM FUNCTION=NJAT0014S03The 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 TCMNJAT0014S04
Sensors, switches and solenoid
valvesFunction
InputPNP switch Detects select lever position and sends a signal to TCM.
Throttle position sensor Detects throttle valve position and sends a signal to TCM.
Closed throttle position switch Detects throttle valve's fully-closed position and sends a signal to TCM.
Wide open throttle position switchDetects 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
sensor (installed on transmission) malfunctions.
Overdrive control switchSends a signal, which prohibits a shift to ªD
4º (overdrive) position, to the
TCM.
Stop lamp switch Releases lock-up system when depressing pedal in lock-up condition.
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 rela-
tion 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
signal sent from TCM.
O/D OFF indicator lamp Shows TCM faults, when A/T control components malfunction.
Control MechanismNJAT0015LINE PRESSURE CONTROLNJAT0015S01TCM has various line pressure control characteristics to match the
driving conditions.
An ON-OFF duty signal is sent to the line pressure solenoid valve
based on TCM characteristics.
Hydraulic pressure on the clutch and brake is electronically con-
trolled through the line pressure solenoid valve to accommodate
engine torque. This results in smooth shift operation.
OVERALL SYSTEM
Control System (Cont'd)
AT-32