Engine control INFINITI QX4 2001 Factory Service Manual

Attachment No.14
TID CID
P0420 01H 01H Max. X -
P0420 02H 81H Min. X -
P0430 03H 02H Max. X -
P0430 04H 82H Min. X -
P0440 05H 03H Max. X -
P1440
★1 05H 03H Max. X -
EVAP control system purge flow monitoring P1447 06H 83H Min. X mV
EVAP control system (Very small leak) P1441
★2 07H 03H Max. X -
P0133 09H 04H Max. X ms
P0131 0AH 84H Min. X mV
P0130 0BH 04H Max. X mV
P0132 0CH 04H Max. X mV
P0134 0DH 04H Max. X s
P0153 11H 05H Max. X ms
P0151 12H 85H Min. X mV
P0150 13H 05H Max. X mV
P0152 14H 05H Max. X mV
P0154 15H 05H Max. X s
P0139 19H 86H Min. X mV/500ms
P0137 1AH 86H Min. X mV
P0140 1BH 06H Max. X mV
P0138 1CH 06H Max. X mV
P0159 21H 87H Min. X mV/500ms
P0157 22H 87H Min. X mV
P0160 23H 07H Max. X mV
P0158 24H 07H Max. X mV
P0135 29H 08H Max. X mV
P0135 2AH 88H Min. X mV
P0155 2BH 09H Max. X mV
P0155 2CH 89H Min. X mV
P0141 2DH 0AH Max. X mV
P0141 2EH 8AH Min. X mV
P0161 2FH 0BH Max. X mV
P0161 30H 8BH Min. X mV
TEST VALUE AND TEST LIMIT (GST ONLY — NOT APPLICABLE TO CONSULT-II)
The following is the information specified in Mode 6 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is “OK” or “NG” while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
Items for which these data (test value and test limit) are displayed are the same as SRT code items.
These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be dis-
played on the GST screen.
: Applicable ･: Not applicable
SRT item Self-diagnostic test item DTCTest value
(GST display)Te s t limit Application Unit
CATALYSTThree way catalyst function (Bank 1)
Three way catalyst function (Bank 2)
EVAP SYSTEMEVAP control system (Small leak)
HO2SHeated oxygen sensor 1(Bank 1)
Heated oxygen sensor 1(Bank 2)
Heated oxygen sensor 2(Bank 1)
Heated oxygen sensor 2(Bank 2)
HO2S HTRHeated oxygen sensor 1 heater(Bank 1)
Heated oxygen sensor 2 heater(Bank 2)
Heated oxygen sensor 2 heater(Bank 1)
Heated oxygen sensor 2 heater(Bank 2)
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AUTOMATIC TRANSMISSION
SECTION
AT
CONTENTS
TROUBLE DIAGNOSIS - INDEX....................................4
Alphabetical & P No. Index for DTC ...........................4
PRECAUTIONS...............................................................6
Precautions for Supplemental Restraint System
(SRS)²AIR BAG²and²SEAT BELT
PRE-TENSIONER²......................................................6
Precautions for On Board Diagnostic (OBD)
System of A/T and Engine...........................................6
Precautions ..................................................................6
Service Notice or Precautions .....................................8
Wiring Diagrams and Trouble Diagnosis .....................9
PREPARATION.............................................................10
Special Service Tools ................................................10
OVERALL SYSTEM......................................................12
A/T Electrical Parts Location .....................................12
Circuit Diagram ..........................................................13
Cross-sectional View .................................................14
Hydraulic Control Circuit ............................................15
Shift Mechanism ........................................................16
Control System ..........................................................25
Control Mechanism ....................................................26
Control Valve .............................................................31
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................33
Introduction ................................................................33
OBD-II Function for A/T System ................................33
One or Two Trip Detection Logic of OBD-II ..............33
OBD-II Diagnostic Trouble Code (DTC) ....................33
Malfunction Indicator Lamp (MIL) ..............................37
CONSULT-II ...............................................................37
Diagnostic Procedure Without CONSULT-II ..............46
TROUBLE DIAGNOSIS - INTRODUCTION..................53
Introduction ................................................................53
Work Flow ..................................................................57
TROUBLE DIAGNOSIS - BASIC INSPECTION...........59
A/T Fluid Check .........................................................59
Stall Test ....................................................................59
Line Pressure Test .....................................................62
Road Test...................................................................63TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION...............................................................81
Symptom Chart ..........................................................81
TCM Terminals and Reference Value........................92
TROUBLE DIAGNOSIS FOR POWER SUPPLY..........96
Wiring Diagram - AT - MAIN ......................................96
Diagnostic Procedure ................................................97
DTC P0705 PARK/NEUTRAL POSITION SWITCH.....99
Description .................................................................99
Wiring Diagram - AT - PNP/SW...............................101
Diagnostic Procedure ..............................................102
Component Inspection .............................................103
DTC P0710 A/T FLUID TEMPERATURE SENSOR
CIRCUIT.......................................................................105
Description ...............................................................105
Wiring Diagram - AT - FTS ......................................107
Diagnostic Procedure ..............................................108
Component Inspection ............................................. 110
DTC P0720 VEHICLE SPEED SENSOR.A/T
(REVOLUTION SENSOR)........................................... 111
Description ............................................................... 111
Wiring Diagram - AT - VSSA/T ................................ 113
Diagnostic Procedure .............................................. 114
Component Inspection ............................................. 115
DTC P0725 ENGINE SPEED SIGNAL....................... 116
Description ............................................................... 116
Wiring Diagram - AT - ENGSS ................................ 117
Diagnostic Procedure .............................................. 118
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR
POSITION....................................................................120
Description ...............................................................120
Wiring Diagram - AT - 1ST ......................................123
Diagnostic Procedure ..............................................124
Component Inspection .............................................125
DTC P0732 IMPROPER SHIFTING TO 2ND GEAR
POSITION....................................................................126
Description ...............................................................126
Wiring Diagram - AT - 2ND......................................129
Diagnostic Procedure ..............................................130
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Component Inspection .............................................131
DTC P0733 IMPROPER SHIFTING TO 3RD GEAR
POSITION....................................................................132
Description ...............................................................132
Wiring Diagram - AT - 3RD......................................135
Diagnostic Procedure ..............................................136
Component Inspection .............................................137
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR
POSITION....................................................................138
Description ...............................................................138
Wiring Diagram - AT - 4TH ......................................142
Diagnostic Procedure ..............................................143
Component Inspection .............................................147
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE......................................................148
Description ...............................................................148
Wiring Diagram - AT - TCV......................................150
Diagnostic Procedure ..............................................151
Component Inspection .............................................152
DTC P0744 IMPROPER LOCK-UP OPERATION......153
Description ...............................................................153
Wiring Diagram - AT - TCCSIG ...............................156
Diagnostic Procedure ..............................................157
Component Inspection .............................................161
DTC P0745 LINE PRESSURE SOLENOID VALVE...162
Description ...............................................................162
Wiring Diagram - AT - LPSV....................................164
Diagnostic Procedure ..............................................165
Component Inspection .............................................167
DTC P0750 SHIFT SOLENOID VALVE A..................168
Description ...............................................................168
Wiring Diagram - AT - SSV/A ..................................169
Diagnostic Procedure ..............................................170
Component Inspection .............................................171
DTC P0755 SHIFT SOLENOID VALVE B..................172
Description ...............................................................172
Wiring Diagram - AT - SSV/B ..................................173
Diagnostic Procedure ..............................................174
Component Inspection .............................................175
DTC P1705 THROTTLE POSITION SENSOR...........176
Description ...............................................................176
Wiring Diagram - AT - TPS ......................................179
Diagnostic Procedure ..............................................180
Component Inspection .............................................184
DTC P1760 OVERRUN CLUTCH SOLENOID
VALVE..........................................................................185
Description ...............................................................185
Wiring Diagram - AT - OVRCSV..............................187
Diagnostic Procedure ..............................................188
Component Inspection .............................................189
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP
SENSOR CIRCUIT AND TCM POWER SOURCE)....190Description ...............................................................190
Wiring Diagram - AT - BA/FTS ................................192
Diagnostic Procedure ..............................................193
Component Inspection .............................................196
DTC VEHICLE SPEED SENSOR.MTR.......................197
Description ...............................................................197
Wiring Diagram - AT - VSSMTR ..............................199
Diagnostic Procedure ..............................................200
DTC TURBINE REVOLUTION SENSOR....................202
Description ...............................................................202
Wiring Diagram - AT - TRSA/T ................................204
Diagnostic Procedure ..............................................205
Component Inspection .............................................206
DTC A/T COMMUNICATION LINE.............................207
Description ...............................................................207
Wiring Diagram - AT - LAN ......................................209
Diagnostic Procedure ..............................................210
DTC CONTROL UNIT (RAM), CONTROL UNIT
(ROM)........................................................................... 211
Description ............................................................... 211
Diagnostic Procedure ..............................................212
DTC CONTROL UNIT (EEP ROM).............................213
Description ...............................................................213
Diagnostic Procedure ..............................................214
TROUBLE DIAGNOSES FOR SYMPTOMS...............215
Wiring Diagram - AT - NONDTC .............................215
1. O/D OFF Indicator Lamp Does Not Come On....218
2. Engine Cannot Be Started In²P²and²N²
Position ....................................................................221
3. In²P²Position, Vehicle Moves Forward Or
Backward When Pushed .........................................222
4. In²N²Position, Vehicle Moves ...........................223
5. Large Shock.²N²->²R²Position .......................225
6. Vehicle Does Not Creep Backward In²R²
Position ....................................................................227
7. Vehicle Does Not Creep Forward In²D²,²2²
Or²1²Position .........................................................230
8. Vehicle Cannot Be Started From D
1...................233
9. A/T Does Not Shift: D
1-> D2Or Does Not
Kickdown: D
4-> D2..................................................236
10. A/T Does Not Shift: D
2-> D3.............................239
11. A/T Does Not Shift: D
3-> D4.............................242
12. A/T Does Not Perform Lock-up .........................245
13. A/T Does Not Hold Lock-up Condition ..............247
14. Lock-up Is Not Released ...................................249
15. Engine Speed Does Not Return To Idle (Light
Braking D
4-> D3).....................................................250
16. Vehicle Does Not Start From D
1.......................252
17. A/T Does Not Shift: D
4-> D3, When
Overdrive Control Switch²ON²->²OFF²...............253
18. A/T Does Not Shift: D
3-> 22, When Selector
Lever²D²->²2²Position.........................................254
CONTENTS(Cont'd)
AT-2

19. A/T Does Not Shift: 22-> 11, When Selector
Lever²2²->²1²Position .........................................255
20. Vehicle Does Not Decelerate By Engine
Brake........................................................................256
21. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control and Throttle Position Switches
Circuit Checks) ........................................................257
A/T SHIFT LOCK SYSTEM.........................................265
Description ...............................................................265
Wiring Diagram - SHIFT -........................................266
Diagnostic Procedure ..............................................267
KEY INTERLOCK CABLE..........................................271
Components.............................................................271
Removal ...................................................................271
Installation ................................................................272
ON-VEHICLE SERVICE..............................................273
Control Valve Assembly and Accumulators .............273
Revolution Sensor Replacement .............................274
Turbine Revolution Sensor Replacement................274
Rear Oil Seal Replacement .....................................274
Rear Oil Seal and Companion Flange Oil Seal
Replacement ............................................................275
Parking Components Inspection..............................275
Park/Neutral Position Switch Adjustment ................276
Manual Control Linkage Adjustment........................276
REMOVAL AND INSTALLATION...............................277
Removal ...................................................................277
Installation ................................................................278
OVERHAUL.................................................................281
Components.............................................................281
Oil Channel ..............................................................284
Locations of Needle Bearings, Thrust Washers
and Snap Rings .......................................................285
DISASSEMBLY............................................................286
REPAIR FOR COMPONENT PARTS.........................297Oil Pump ..................................................................297
Control Valve Assembly ...........................................301
Control Valve Upper Body .......................................307
Control Valve Lower Body .......................................312
Reverse Clutch ........................................................314
High Clutch ..............................................................317
Forward and Overrun Clutches ...............................320
Low & Reverse Brake..............................................324
Forward Clutch Drum Assembly ..............................328
Rear Internal Gear and Forward Clutch Hub ..........330
Band Servo Piston Assembly ..................................333
Parking Pawl Components ......................................337
ASSEMBLY..................................................................339
Assembly (1) ............................................................339
Adjustment ...............................................................347
Assembly (2) ............................................................349
SERVICE DATA AND SPECIFICATIONS (SDS).......356
General Specifications .............................................356
Shift Schedule..........................................................356
Stall Revolution ........................................................356
Line Pressure...........................................................356
Return Springs .........................................................357
Accumulator O-ring ..................................................358
Clutches and Brakes ...............................................358
Oil Pump and Low One-way Clutch ........................360
Total End Play..........................................................360
Reverse Clutch Drum End Play ..............................361
Removal and Installation .........................................361
Shift Solenoid Valves ...............................................361
Solenoid Valves .......................................................361
A/T Fluid Temperature Sensor.................................361
Turbine Revolution Sensor ......................................361
Revolution Sensor ...................................................362
Dropping Resistor ....................................................362GI
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CONTENTS(Cont'd)
AT-3

Shift MechanismNBAT0012The 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.
CONSTRUCTIONNBAT0012S01
SAT509I
1. Torque converter clutch piston
2. Torque converter
3. Oil pump
4. Input shaft
5. Brake band
6. Reverse clutch
7. High clutch
8. Front pinion gear9. Front sun gear
10. Front internal gear
11. Front planetary carrier
12. Rear sun gear
13. Rear pinion gear
14. Rear internal gear
15. Rear planetary carrier
16. Forward clutch17. Forward one-way clutch
18. Overrun clutch
19. Low one-way clutch
20. Low & reverse brake
21. Parking pawl
22. Parking gear
23. Output shaft
FUNCTION OF CLUTCH AND BRAKENBAT0012S02
Clutch and brake components Abbr. Function
Reverse clutch6R/C To transmit input power to front sun gear9.
High clutch7H/C To transmit input power to front planetary carrier11.
Forward clutch16F/C To connect front planetary carrier11with forward one-way
clutch17.
Overrun clutch18O/C To connect front planetary carrier11with rear internal gear14.
Brake band5B/B To lock front sun gear9.
Forward one-way clutch17F/O.C When forward clutch16is engaged, to stop rear internal gear
14from rotating in opposite direction against engine revolution.
Low one-way clutch19L/O.C To stop front planetary carrier11from rotating in opposite direc-
tion against engine revolution.
Low & reverse brake20L & R/B To lock front planetary carrier11.
OVERALL SYSTEM
Shift Mechanism
AT-16

CLUTCH AND BAND CHARTNBAT0012S03
Shift positionReverse
clutchHigh
clutchFor-
ward
clutchOver-
run
clutchBand servoFor-
ward
one
-way
clutchLow
one-
way
clutchLow &
reverse
brakeLock-up Remarks
2nd
apply3rd
release4th
apply
PPARK
POSITION
RqqREVERSE
POSITION
NNEUTRAL
POSITION
D*41stq*1D B B
Automatic
shift
1k2k3
k4 2ndq*1AqB
3rdqq*1A *2C C B *5q
4thqC *3C Cqq
21stqDBBAutomatic
shift
1k2 2ndq*1AqB
11stqqBqLocks (held
stationary) in
1st speed
1g2 2ndqqqB
*1: Operates when overdrive control switch is being set in ªOFFº position.
*2: Oil pressure is applied to both 2nd ªapplyº side and 3rd ªreleaseº side of band servo piston. However, brake band does not contract
because oil pressure area on the ªreleaseº side is greater than that on the ªapplyº side.
*3: Oil pressure is applied to 4th ªapplyº side in condition *2 above, and brake band contracts.
*4: A/T will not shift to 4th when overdrive control switch is set in ªOFFº position.
*5: Operates when overdrive control switch is ªOFFº.
q: Operates.
A: Operates when throttle opening is less than 3/16, activating engine brake.
B: Operates during ªprogressiveº acceleration.
C: Operates but does not affect power transmission.
D: Operates when throttle opening is less than 3/16, but does not affect engine brake.
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OVERALL SYSTEM
Shift Mechanism (Cont'd)
AT-17

ªD1º and ª21º Positions=NBAT0012S0402
Forward one-way clutch
Forward clutch
Low one-way clutchRear internal gear is locked to rotate counterclockwise because of the functioning of
these three clutches. (Start-up at D
1)
Overrun clutch
engagement conditions
(Engine brake)D
1: Overdrive control switch in ªOFFº
Throttle opening less than 3/16
2
1: Throttle opening less than 3/16
At D
1and 21positions, engine brake is not activated due to free turning of low one-way
clutch.
SAT096J
OVERALL SYSTEM
Shift Mechanism (Cont'd)
AT-20

Control System=NBAT0013OUTLINENBAT0013S01The automatic transmission senses vehicle operating conditions through various sensors. It always controls
the optimum shift position and reduces shifting and lock-up shocks.
SENSORS
ETCM
EACTUATORS
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
ASCD control unit
Stop lamp switch
Turbine revolution sensorShift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication
line
Duet-EU controlShift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch sole-
noid valve
Line pressure solenoid valve
O/D OFF indicator lamp
T/F control unit
CONTROL SYSTEMNBAT0013S02
SAT125K
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OVERALL SYSTEM
Control System
AT-25

TCM FUNCTION=NBAT0013S03The function of the TCM is to:
IReceive input signals sent from various switches and sensors.
IDetermine required line pressure, shifting point, lock-up operation, and engine brake operation.
ISend required output signals to the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCMNBAT0013S04
Sensors and solenoid valves Function
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.
ASCD control unitSends the cruise signal and ªD
4º (overdrive) cancellation signal from ASCD
control unit to TCM.
Turbine revolution sensor Sends an input shaft revolution signal.
Stop lamp switch Sends the lock-up release signal to the TCM at time of D
4(lock-up).
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 MechanismNBAT0180LINE PRESSURE CONTROLNBAT0180S01TCM has the various line pressure control characteristics to meet
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-26

SAT003J
Normal ControlNBAT0180S0101The line pressure to throttle opening characteristics is set for suit-
able clutch operation.
SAT004J
Back-up Control (Engine brake)NBAT0180S0102If the selector lever is shifted to ª2º position while driving in D4(OD)
or D
3, great driving force is applied to the clutch inside the trans-
mission. Clutch operating pressure (line pressure) must be
increased to deal with this driving force.
SAT005J
During Shift ChangeNBAT0180S0103The line pressure is temporarily reduced corresponding to a
change in engine torque when shifting gears (that is, when the shift
solenoid valve is switched for clutch operation) to reduce shifting
shock.
At Low Fluid TemperatureNBAT0180S0104IFluid viscosity and frictional characteristics of the clutch facing
change with fluid temperature. Clutch engaging or band-con-
tacting pressure is compensated for, according to fluid
temperature, to stabilize shifting quality.
SAT006J
IThe line pressure is reduced below 60ÉC (140ÉF) to prevent
shifting shock due to low viscosity of automatic transmission
fluid when temperature is low.
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OVERALL SYSTEM
Control Mechanism (Cont'd)
AT-27