2006 INFINITI FX35 SHIFT LOCK

AT-1
AUTOMATIC TRANSMISSION
C TRANSMISSION/TRANSAXLE
CONTENTS
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SECTION AT
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Revision: 2006 December 2006 FX35/FX45
AUTOMATIC TRANSMISSION
INDEX FOR DTC ................................................... ..... 5
Alphabetical Index ............................................... ..... 5
DTC No. Index .................................................... ..... 6
PRECAUTIONS ..................................................... ..... 7
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 7
Precautions for On Board Diagnostic (OBD) System
of A/T and Engine ............................................... ..... 7
Precautions ......................................................... ..... 8
Service Notice or Precautions ............................. ..... 9
PREPARATION ...................................................... ... 10
Special Service Tools .......................................... ... 10
Commercial Service Tools ................................... .... 11
A/T FLUID .............................................................. ... 12
Changing A/T Fluid ............................................. ... 12
Checking A/T Fluid .............................................. ... 13
A/T Fluid Cooler Cleaning ................................... ... 15
A/T CONTROL SYSTEM ....................................... ... 18
Cross-sectional View (2WD Models) ................... ... 18
Cross-sectional View (VQ35DE Models for AWD) ... 19
Cross-sectional View (VK45DE Models for AWD) ... 20
Shift Mechanism .................................................. ... 21
TCM Function ...................................................... ... 32
CAN Communication ........................................... ... 33
Input/Output Signal of TCM ................................. ... 33
Line Pressure Control ......................................... ... 34
Shift Control ........................................................ ... 35
Lock-up Control ................................................... ... 37
Engine Brake Control .......................................... ... 38
Control Valve ....................................................... ... 38
ON BOARD DIAGNOSTIC (OBD) SYSTEM ......... ... 40
Introduction ......................................................... ... 40
OBD-II Function for A/T System .......................... ... 40
One or Two Trip Detection Logic of OBD-II ......... ... 40
OBD-II Diagnostic Trouble Code (DTC) .............. ... 40
Malfunction Indicator Lamp (MIL) ........................ ... 43
TROUBLE DIAGNOSIS ......................................... ... 44
DTC Inspection Priority Chart ............................. ... 44
Fail-safe .............................................................. ... 44 How to Perform Trouble Diagnosis for Quick and
Accurate Repair ................................................... ... 46
A/T Electrical Parts Location ............................... ... 51
Circuit Diagram .................................................... ... 52
Inspections Before Trouble Diagnosis ................. ... 53
Check Before Engine Is Started .......................... ... 57
Check at Idle ........................................................ ... 57
Cruise Test - Part 1 .............................................. ... 58
Cruise Test - Part 2 .............................................. ... 60
Cruise Test - Part 3 .............................................. ... 61
Vehicle Speed at Which Gear Shifting Occurs .... ... 62
Vehicle Speed at Which Lock-up Occurs/Releases ... 63
Symptom Chart .................................................... ... 64
TCM Input/Output Signal Reference Values ........ ... 89
CONSULT-II Function (A/T) ................................. ... 90
Diagnostic Procedure without CONSULT-II ......... .102
DTC U1000 CAN COMMUNICATION LINE ........... .104
Description ........................................................... .104
On Board Diagnosis Logic ................................... .104
Possible Cause .................................................... .104
DTC Confirmation Procedure .............................. .104
Wiring Diagram — AT — CAN ............................. .105
Diagnostic Procedure .......................................... .106
DTC P0615 START SIGNAL CIRCUIT .................. .107
Description ........................................................... .107
CONSULT-II Reference Value ............................. .107
On Board Diagnosis Logic ................................... .107
Possible Cause .................................................... .107
DTC Confirmation Procedure .............................. .107
Wiring Diagram — AT — STSIG ......................... .108
Diagnostic Procedure .......................................... .109
DTC P0700 TCM .................................................... .. 111
Description ........................................................... ..111
On Board Diagnosis Logic ................................... ..111
Possible Cause .................................................... ..111
DTC Confirmation Procedure .............................. ..111
Diagnostic Procedure .......................................... ..111
DTC P0705 PARK/NEUTRAL POSITION SWITCH .112
Description ........................................................... .112
CONSULT-II Reference Value ............................. .112

AT-3
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Revision: 2006 December 2006 FX35/FX45 DTC P1762 DIRECT CLUTCH SOLENOID VALVE
. 154
Description .......................................................... . 154
CONSULT-II Reference Value ............................. . 154
On Board Diagnosis Logic .................................. . 154
Possible Cause ................................................... . 154
DTC Confirmation Procedure .............................. . 154
Diagnostic Procedure .......................................... . 155
DTC P1764 DIRECT CLUTCH SOLENOID VALVE
FUNCTION ............................................................. . 156
Description .......................................................... . 156
CONSULT-II Reference Value ............................. . 156
On Board Diagnosis Logic .................................. . 156
Possible Cause ................................................... . 156
DTC Confirmation Procedure .............................. . 156
Diagnostic Procedure .......................................... . 157
DTC P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE ................................................ . 158
Description .......................................................... . 158
CONSULT-II Reference Value ............................. . 158
On Board Diagnosis Logic .................................. . 158
Possible Cause ................................................... . 158
DTC Confirmation Procedure .............................. . 158
Diagnostic Procedure .......................................... . 159
DTC P1769 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE FUNCTION ............................ . 160
Description .......................................................... . 160
CONSULT-II Reference Value ............................. . 160
On Board Diagnosis Logic .................................. . 160
Possible Cause ................................................... . 160
DTC Confirmation Procedure .............................. . 160
Diagnostic Procedure .......................................... . 161
DTC P1772 LOW COAST BRAKE SOLENOID
VALVE .................................................................... . 162
Description .......................................................... . 162
CONSULT-II Reference Value ............................. . 162
On Board Diagnosis Logic .................................. . 162
Possible Cause ................................................... . 162
DTC Confirmation Procedure .............................. . 162
Diagnostic Procedure .......................................... . 163
DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION ................................................ . 164
Description .......................................................... . 164
CONSULT-II Reference Value ............................. . 164
On Board Diagnosis Logic .................................. . 164
Possible Cause ................................................... . 164
DTC Confirmation Procedure .............................. . 164
Diagnostic Procedure .......................................... . 165
DTC P1815 MANUAL MODE SWITCH ................. . 166
Description .......................................................... . 166
CONSULT-II Reference Value in Data Monitor Mode . 166
On Board Diagnosis Logic .................................. . 166
Possible Cause ................................................... . 166
DTC Confirmation Procedure .............................. . 166
Wiring Diagram — AT — MMSW ........................ . 167
Diagnostic Procedure .......................................... . 169
Component Inspection ........................................ . 170
DTC P1841 ATF PRESSURE SWITCH 1 .............. . 171
Description .......................................................... . 171 CONSULT-II Reference Value .............................
.171
On Board Diagnosis Logic ................................... .171
Possible Cause .................................................... .171
DTC Confirmation Procedure .............................. .171
Diagnostic Procedure .......................................... .172
DTC P1843 ATF PRESSURE SWITCH 3 .............. .173
Description ........................................................... .173
CONSULT-II Reference Value ............................. .173
On Board Diagnosis Logic ................................... .173
Possible Cause .................................................... .173
DTC Confirmation Procedure .............................. .173
Diagnostic Procedure .......................................... .174
DTC P1845 ATF PRESSURE SWITCH 5 .............. .175
Description ........................................................... .175
CONSULT-II Reference Value ............................. .175
On Board Diagnosis Logic ................................... .175
Possible Cause .................................................... .175
DTC Confirmation Procedure .............................. .175
Diagnostic Procedure .......................................... .176
DTC P1846 ATF PRESSURE SWITCH 6 .............. .177
Description ........................................................... .177
CONSULT-II Reference Value ............................. .177
On Board Diagnosis Logic ................................... .177
Possible Cause .................................................... .177
DTC Confirmation Procedure .............................. .177
Diagnostic Procedure .......................................... .178
MAIN POWER SUPPLY AND GROUND CIRCUIT .179
Wiring Diagram — AT — MAIN ........................... .179
Diagnostic Procedure .......................................... .180
CLOSED THROTTLE POSITION AND WIDE OPEN
THROTTLE POSITION CIRCUIT ........................... .183
CONSULT-II Reference Value ............................. .183
Diagnostic Procedure .......................................... .183
BRAKE SIGNAL CIRCUIT ..................................... .184
CONSULT-II Reference Value ............................. .184
Diagnostic Procedure .......................................... .184
A/T INDICATOR CIRCUIT ...................................... .185
Description ........................................................... .185
CONSULT-II Reference Value ............................. .185
Diagnostic Procedure .......................................... .185
TROUBLE DIAGNOSIS FOR SYMPTOMS ........... .186
Wiring Diagram — AT — NONDTC ..................... .186
A/T CHECK Indicator Lamp Does Not Come On . 189
Engine Cannot Be Started in “P” or “N” Position . .190
In “P” Position, Vehicle Moves When Pushed ..... .191
In “N” Position, Vehicle Moves ............................. .192
Large Shock (“N” to “D” Position) ........................ .193
Vehicle Does Not Creep Backward in “R” Position .196
Vehicle Does Not Creep Forward in “D” Position . 199
Vehicle Cannot Be Started From D
1 .................... .201
A/T Does Not Shift: D
1 → D2 ............................... .204
A/T Does Not Shift: D
2 → D3 ............................... .206
A/T Does Not Shift: D
3 → D4 ............................... .208
A/T Does Not Shift: D
4 → D5 ............................... .211
A/T Does Not Lock-up ......................................... .213
A/T Does Not Hold Lock-up Condition ................. .215
Lock-up Is Not Released ..................................... .217
Engine Speed Does Not Return to Idle ............... .217
Cannot Be Changed to Manual Mode ................. .219

AT-4Revision: 2006 December 2006 FX35/FX45 A/T Does Not Shift: 5th Gear
→ 4th Gear ........... .219
A/T Does Not Shift: 4th Gear → 3rd Gear ........... .221
A/T Does Not Shift: 3rd Gear → 2nd Gear .......... .223
A/T Does Not Shift: 2nd Gear → 1st Gear ........... .225
Vehicle Does Not Decelerate by Engine Brake ... .227
SHIFT CONTROL SYSTEM ................................... .229
Control Device Removal and Installation ............. .229
Control Rod Removal and Installation ................. .230
Adjustment of A/T Position .................................. .231
Checking of A/T Position ..................................... .231
A/T SHIFT LOCK SYSTEM .................................... .232
Description ........................................................... .232
Shift Lock System Electrical Parts Location ........ .232
Wiring Diagram — AT — SHIFT .......................... .233
Diagnostic Procedure .......................................... .234
KEY INTERLOCK CABLE ..................................... .236
Components ........................................................ .236
Removal and Installation ..................................... .237
ON-VEHICLE SERVICE ......................................... .239
Control Valve with TCM and A/T Fluid Temperature
Sensor 2 .............................................................. .239
Parking Components (2WD Models Only) ........... .251
Rear Oil Seal ....................................................... .258
Revolution Sensor Components (2WD Models
Only) .................................................................... .259
AIR BREATHER HOSE .......................................... .264
Removal and Installation ..................................... .264
TRANSMISSION ASSEMBLY ............................... .266
Removal and Installation (2WD Models) ............. .266
Removal and Installation (AWD Models) ............. .269 OVERHAUL ............................................................
.274
Components ......................................................... .274
Oil Channel .......................................................... .288
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ......................... .291
DISASSEMBLY ...................................................... .294
Disassembly ......................................................... .294
REPAIR FOR COMPONENT PARTS ..................... .312
Oil Pump .............................................................. .312
Front Sun Gear, 3rd One-way Clutch ................... .315
Front Carrier, Input Clutch, Rear Internal Gear .... .317
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub ............................................. .323
High and Low Reverse Clutch ............................. .329
Direct Clutch ........................................................ .332
ASSEMBLY ............................................................ .335
Assembly (1) ........................................................ .335
Adjustment ........................................................... .349
Assembly (2) ........................................................ .352
SERVICE DATA AND SPECIFICATIONS (SDS) ... .359
General Specifications ......................................... .359
Vehicle Speed at Which Gear Shifting Occurs ..... .359
Vehicle Speed at Which Lock-up Occurs/Releases .360
Stall Speed ........................................................... .360
Line Pressure ....................................................... .360
A/T Fluid Temperature Sensor ............................. .360
Turbine Revolution Sensor ................................... .361
Vehicle Speed Sensor A/T (Revolution Sensor) .. .361
Reverse Brake ..................................................... .361
Total End Play ...................................................... .361

AT-32
A/T CONTROL SYSTEM
Revision: 2006 December 2006 FX35/FX45
TCM FunctionNCS001AZ
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.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
CONTROL SYSTEM DIAGRAM
SENSORS (or SIGNALS)

TCM

ACTUATORS
PNP switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed signal
Manual mode switch signal
Stop lamp switch signal
Turbine revolution sensor
ATF pressure switch Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
Duet-EA control
CAN system Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch
solenoid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
SCIA5325E

A/T CONTROL SYSTEM AT-33
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Revision: 2006 December 2006 FX35/FX45
CAN CommunicationNCS001B0
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-32,
"CAN Communication Unit" .
Input/Output Signal of TCMNCS001B1
*1: Spare for vehicle speed sensor·A/T (revolution 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: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kin d of error.
*5: Input by CAN communications
*6: Output by CAN communications 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
(*5)XXXXXXX
Vehicle speed sensor A/T
(revolution sensor) XXXXXXX
Vehicle speed sensor MTR
(*1) (*5)X
Closed throttle position signal
(*5)X (*2) X X X X (*4)
Wide open throttle position signal
(*5)XX (*4)
Turbine revolution sensor 1 X X X X X
Turbine revolution sensor 2
(for 4th speed only) X XXXX
Engine speed signals
(*5)XXXXXXX
Stop lamp switch signal
(*5)XXX X (*4)
A/T fluid temperature sensors 1, 2XXXX XX
ASCD or
ICC Operation signal
(*5)XXX
Overdrive cancel
signal
(*5)X
Out-
put Direct clutch solenoid (ATF pres-
sure switch 5) XX XX
Input clutch solenoid (ATF pressure
switch 3) XX XX
High and low reverse clutch sole-
noid (ATF pressure switch 6) XX XX
Front brake solenoid (ATF pressure
switch 1) XX XX
Low coast brake solenoid (ATF
pressure switch 2) XX XXX
Line pressure solenoid XXXXXXX
TCC solenoid X X X
Self-diagnostics table
(*6)X
Sta rter rela y XX

A/T CONTROL SYSTEM AT-37
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Revision: 2006 December 2006 FX35/FX45
Lock-up ControlNCS001B4
The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve,
which is controlled by a signal from TCM, and the torque converter clutch control valve engages or releases
the torque converter clutch piston.
Lock-up Operation Condition Table
TORQUE CONVERTER CLUTCH CONTROL VALVE CONTROL
Lock-up Control System Diagram
Lock-up Released
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque
converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
SMOOTH LOCK-UP CONTROL
When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con-
verter clutch solenoid is controlled with the TCM. In this way, when shifting to the lock-up applied state, the
torque converter clutch is temporarily set to the half-clutched state to reduce the shock.
Half-clutched State
The current output from the TCM to the torque converter clutch solenoid is varied to gradually increase the
torque converter clutch solenoid pressure.
In this way, the lock-up apply pressure gradually rises and while the torque converter clutch piston is put into
half-clutched status, the torque converter clutch piston operating pressure is increased and the coupling is
completed smoothly.
Slip Lock-up Control
In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the half-
clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed.
selector lever D position M5 position M4 position M3 position
Gear position 54543
Lock-up ×–×××
Slip lock-up ××–––
PCIA0014E

AT-38
A/T CONTROL SYSTEM
Revision: 2006 December 2006 FX35/FX45
Engine Brake ControlNCS001B5

The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.

The operation of the low coast brake solenoid switches the low coast brake switching valve and controls
the coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.
Control ValveNCS001B6
FUNCTION OF CONTROL VALVE
SCIA1520E
Name Function
Torque converter regulator valve In order to prevent the pressure supplied to the torque converter from being excessive,
the line pressure is adjusted to the optimum pressure (torque converter operating pres-
sure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeve Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valve When the front brake is coupled, adjusts the line pressure to the optimum pressure
(front brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears,
adjusts the clutch pressure.)
Accumulator control valve Adjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve A Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve B Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valve When the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valve When the high and low reverse clutch is coupled, adjusts the line pressure to the opti-
mum pressure (high and low reverse clutch pressure) and supplies it to the high and low
reverse clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)

AT-46
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
How to Perform Trouble Diagnosis for Quick and Accurate RepairNCS001BE
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelerator pedal position sensor (throttle position
sensor) or PNP switch and provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a error that occurs intermittently
rather than continuously. Most intermittent errors are caused by poor
electric connections or improper wiring. In this case, careful check-
ing of suspected circuits may help prevent the replacement of good
parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the AT- 4 7 , "
WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “DIAGNOSTIC WORKSHEET” as
shown on the example (Refer to AT- 4 8
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT631IB
SAT632I
SEF234G