Infiniti F50. Manual — part 29

AT-1

AUTOMATIC TRANSMISSION

C TRANSMISSION/TRANSAXLE

CONTENTS

D

E

F

G

H

I

J

K

L

M

SECTION

A

B

AT

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 for A/T Assembly Replacement . . . 8
Precautions . . . . . . . . . . . . . . . .. 9
Service Notice or Precautions . . . . . . . . 10
Wiring Diagrams and Trouble Diagnosis . . . . .11

PREPARATION . . . . . . . . . . . . . . . 12

Special Service Tools . . . . . . . . . . . . 12
Commercial Service Tools . . . . . . . . . .. 13

A/T FLUID . . . . . . . . . . . . . . . . . 14

Changing A/T Fluid . . . . . . . . . . . . 14
Checking A/T Fluid . . . . . . . . . . . . . 14

A/T CONTROL SYSTEM . . . . . . . . . . .. 16

Cross-Sectional View . . . . . . . . . . . . 16
Shift Mechanism . . . . . . . . . . . . . . 17
TCM Function . . . . . . . . . . . . . . . 28
CAN Communication . . . . . . . . . . . .. 29
Input/Output Signal of TCM . . . . . . . . . 31
Line Pressure Control . . . . . . . . . . . 32
Shift Control . . . . . . . . . . . . . . ... 34
Lock-Up Control . . . . . . . . . . . . . . 35
Engine Brake Control . . . . . . . . . . . . 36
Control Valve . . . . . . . . . . . . . . .. 36

ON BOARD DIAGNOSTIC (OBD) SYSTEM . . . 38

Introduction . . . . . . . . . . . . . . . 38
OBD-II Function for A/T System . . . . . . . . 38
One or Two Trip Detection Logic of OBD-II . . . 38
OBD-II Diagnostic Trouble Code (DTC) . . . . . 38
Malfunction Indicator Lamp (MIL) . . . . . . ... 41

TROUBLE DIAGNOSIS . . . . . . . . . . . 42

DTC Inspection Priority Chart . . . . . . . . 42
Fail-Safe . . . . . . . . . . . . . . . . . 42
How To Perform Trouble Diagnosis For Quick and

Accurate Repair . . . . . . . . . . . . . .. 44
A/T Electrical Parts Location . . . . . . . . .. 49
Circuit Diagram . . . . . . . . . . . . . ... 50
Inspections Before Trouble Diagnosis . . . . . 51
Check Before Engine is Started . . . . . . . .. 55
Check at Idle . . . . . . . . . . . . . . ... 55
Cruise Test - Part 1 . . . . . . . . . . . . . 56
Cruise Test - Part 2 . . . . . . . . . . . . . 58
Cruise Test - Part 3 . . . . . . . . . . . . . 59
Vehicle Speed When Shifting Gears . . . . . .. 60
Vehicle Speed When Performing and Releasing
Complete Lock-up . . . . . . . . . . . . .. 60
Vehicle Speed When Performing and Releasing
Slip Lock-up . . . . . . . . . . . . . . . 60
Symptom Chart . . . . . . . . . . . . . ... 60
TCM Input/Output Signal Reference Values . . ... 84
CONSULT-II . . . . . . . . . . . . . . . 86
Diagnostic Procedure Without CONSULT-II . . ... 97

DTC U1000 CAN COMMUNICATION LINE . . . .. 99

Description . . . . . . . . . . . . . . . .. 99
On Board Diagnosis Logic . . . . . . . . . .. 99
Possible Cause . . . . . . . . . . . . . ... 99
DTC Confirmation Procedure . . . . . . . . . 99
Wiring Diagram — AT — CAN . . . . . . . .. 100
Diagnostic Procedure . . . . . . . . . . ... 101

DTC P0615 START SIGNAL CIRCUIT . . . . ... 102

Description . . . . . . . . . . . . . . . 102
On Board Diagnosis Logic . . . . . . . . . 102
Possible Cause . . . . . . . . . . . . . . 102
DTC Confirmation Procedure . . . . . . . ... 102
Wiring Diagram — AT — STSIG . . . . . . .. 103
Diagnostic Procedure . . . . . . . . . . ... 104

DTC P0705 PARK/NEUTRAL POSITION SWITCH .105

Description . . . . . . . . . . . . . . . 105
On Board Diagnosis Logic . . . . . . . . . 105
Possible Cause . . . . . . . . . . . . . . 105
DTC Confirmation Procedure . . . . . . . ... 105
Wiring Diagram — AT — PNP/SW . . . . . ... 106
Diagnostic Procedure . . . . . . . . . . ... 107
Component Inspection . . . . . . . . . . .. 109

AT-2

DTC P0720 VEHICLE SPEED SENSOR A/T (REV-
OLUTION SENSOR) . . . . . . . . . . . ... 110

Description . . . . . . . . . . . . . . . 110
On Board Diagnosis Logic . . . . . . . . . 110
Possible Cause . . . . . . . . . . . . . . 110
DTC Confirmation Procedure . . . . . . . ... 110
Wiring Diagram — AT — VSSA/T . . . . . . ..111
Diagnostic Procedure . . . . . . . . . . ... 112

DTC P0725 ENGINE SPEED SIGNAL . . . . ... 115

Description . . . . . . . . . . . . . . . 115
On Board Diagnosis Logic . . . . . . . . . 115
Possible Cause . . . . . . . . . . . . . . 115
DTC Confirmation Procedure . . . . . . . ... 115
Diagnostic Procedure . . . . . . . . . . ... 115

DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE . . . . . . . . . . . . . 117

Description . . . . . . . . . . . . . . . 117
CONSULT-II Reference Value . . . . . . . .. 117
On Board Diagnosis Logic . . . . . . . . . 117
Possible Cause . . . . . . . . . . . . . . 117
DTC Confirmation Procedure . . . . . . . ... 117
Wiring Diagram — AT — TCV . . . . . . . .. 118
Diagnostic Procedure . . . . . . . . . . ... 119
Component Inspection . . . . . . . . . . .. 120

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP) . 122

Description . . . . . . . . . . . . . . . 122
On Board Diagnosis Logic . . . . . . . . . 122
Possible Cause . . . . . . . . . . . . . . 122
DTC Confirmation Procedure . . . . . . . ... 122
Wiring Diagram — AT — TCCSIG . . . . . . 123
Diagnostic Procedure . . . . . . . . . . ... 124
Component Inspection . . . . . . . . . . .. 125

DTC P0745 LINE PRESSURE SOLENOID VALVE .127

Description . . . . . . . . . . . . . . . 127
On Board Diagnosis Logic . . . . . . . . . 127
Possible Cause . . . . . . . . . . . . . . 127
DTC Confirmation Procedure . . . . . . . ... 127
Wiring Diagram — AT — LPSV . . . . . . . 128
Diagnostic Procedure . . . . . . . . . . ... 129
Component Inspection . . . . . . . . . . .. 130

DTC P1701 TRANSMISSION CONTROL MODULE
(POWER SUPPLY) . . . . . . . . . . . . .. 132

Description . . . . . . . . . . . . . . . 132
On Board Diagnosis Logic . . . . . . . . . 132
Possible Cause . . . . . . . . . . . . . . 132
DTC Confirmation Procedure . . . . . . . ... 132
Wiring Diagram — AT — POWER . . . . . . 133
Diagnostic Procedure . . . . . . . . . . ... 136
Component Inspection . . . . . . . . . . .. 137

DTC P1702 TRANSMISSION CONTROL MODULE
(RAM) . . . . . . . . . . . . . . . . . .. 138

Description . . . . . . . . . . . . . . . 138
On Board Diagnosis Logic . . . . . . . . . 138
Possible Cause . . . . . . . . . . . . . . 138
DTC Confirmation Procedure . . . . . . . ... 138
Diagnostic Procedure . . . . . . . . . . ... 139

DTC P1703 TRANSMISSION CONTROL MODULE
(ROM) . . . . . . . . . . . . . . . . . .. 140

Description . . . . . . . . . . . . . . . 140

On Board Diagnosis Logic . . . . . . . . . 140
Possible Cause . . . . . . . . . . . . . .140
DTC Confirmation Procedure . . . . . . . . 140
Diagnostic Procedure . . . . . . . . . . . 141

DTC P1704 TRANSMISSION CONTROL MODULE
(EEPROM) . . . . . . . . . . . . . . . ...142

Description . . . . . . . . . . . . . . . 142
On Board Diagnosis Logic . . . . . . . . . 142
Possible Cause . . . . . . . . . . . . . .142
DTC Confirmation Procedure . . . . . . . . 142
Diagnostic Procedure . . . . . . . . . . . 143

DTC P1705 THROTTLE POSITION SENSOR . . 144

Description . . . . . . . . . . . . . . . 144
On Board Diagnosis Logic . . . . . . . . . 144
Possible Cause . . . . . . . . . . . . . .144
DTC Confirmation Procedure . . . . . . . . 144
Diagnostic Procedure . . . . . . . . . . . 144

DTC P1710 A/T FLUID TEMPERATURE SENSOR
CIRCUIT . . . . . . . . . . . . . . . . ..146

Description . . . . . . . . . . . . . . . 146
CONSULT-II Reference Value . . . . . . . ...146
On Board Diagnosis Logic . . . . . . . . . 146
Possible Cause . . . . . . . . . . . . . .146
DTC Confirmation Procedure . . . . . . . . 146
Wiring Diagram — AT — FTS . . . . . . . ...147
Diagnostic Procedure . . . . . . . . . . . 148
Component Inspection . . . . . . . . . . ..151

DTC P1716 TURBINE REVOLUTION SENSOR . 152

Description . . . . . . . . . . . . . . . 152
On Board Diagnosis Logic . . . . . . . . . 152
Possible Cause . . . . . . . . . . . . . .152
DTC Confirmation Procedure . . . . . . . . 152
Wiring Diagram — AT — TRSA/T . . . . . . .153
Diagnostic Procedure . . . . . . . . . . . 154

DTC P1721 VEHICLE SPEED SENSOR MTR . ...157

Description . . . . . . . . . . . . . . . 157
On Board Diagnosis Logic . . . . . . . . . 157
Possible Cause . . . . . . . . . . . . . .157
DTC Confirmation Procedure . . . . . . . . 157
Diagnostic Procedure . . . . . . . . . . . 157

DTC P1730 A/T INTERLOCK . . . . . . . . .159

Description . . . . . . . . . . . . . . . 159
On Board Diagnosis Logic . . . . . . . . . 159
Possible Cause . . . . . . . . . . . . . .159
DTC Confirmation Procedure . . . . . . . . 159
Wiring Diagram — AT — I/LOCK . . . . . . ..160
Judgement of A/T Interlock . . . . . . . . ...164
Diagnostic Procedure . . . . . . . . . . . 165

DTC P1731 A/T 1ST ENGINE BRAKING . . . ...166

Description . . . . . . . . . . . . . . . 166
On Board Diagnosis Logic . . . . . . . . . 166
Possible Cause . . . . . . . . . . . . . .166
DTC Confirmation Procedure . . . . . . . . 166
Wiring Diagram — AT — E/BRE . . . . . . ...167
Diagnostic Procedure . . . . . . . . . . . 168

DTC P1752 INPUT CLUTCH SOLENOID VALVE ..170

Description . . . . . . . . . . . . . . . 170
On Board Diagnosis Logic . . . . . . . . . 170
Possible Cause . . . . . . . . . . . . . .170

AT-3

D

E

F

G

H

I

J

K

L

M

A

B

AT

DTC Confirmation Procedure . . . . . . . ... 170
Wiring Diagram — AT — I/C . . . . . . . . 171
Diagnostic Procedure . . . . . . . . . . ... 172
Component Inspection . . . . . . . . . . . 174

DTC P1754 INPUT CLUTCH SOLENOID VALVE
FUNCTION . . . . . . . . . . . . . . . .. 175

Description . . . . . . . . . . . . . . ... 175
On Board Diagnosis Logic . . . . . . . . ... 175
Possible Cause . . . . . . . . . . . . . 175
DTC Confirmation Procedure . . . . . . . ... 175
Wiring Diagram — AT — I/CF . . . . . . . .. 176
Diagnostic Procedure . . . . . . . . . . ... 177

DTC P1757 FRONT BRAKE SOLENOID VALVE .. 179

Description . . . . . . . . . . . . . . ... 179
On Board Diagnosis Logic . . . . . . . . ... 179
Possible Cause . . . . . . . . . . . . . 179
DTC Confirmation Procedure . . . . . . . ... 179
Wiring Diagram — AT — FR/B . . . . . . . . 180
Diagnostic Procedure . . . . . . . . . . ... 181
Component Inspection . . . . . . . . . . . 183

DTC P1759 FRONT BRAKE SOLENOID VALVE
FUNCTION . . . . . . . . . . . . . . . .. 184

Description . . . . . . . . . . . . . . ... 184
On Board Diagnosis Logic . . . . . . . . ... 184
Possible Cause . . . . . . . . . . . . . 184
DTC Confirmation Procedure . . . . . . . ... 184
Wiring Diagram — AT — FR/BF . . . . . . ... 185
Diagnostic Procedure . . . . . . . . . . ... 186

DTC P1762 DIRECT CLUTCH SOLENOID VALVE

. 188

Description . . . . . . . . . . . . . . ... 188
On Board Diagnosis Logic . . . . . . . . ... 188
Possible Cause . . . . . . . . . . . . . 188
DTC Confirmation Procedure . . . . . . . ... 188
Wiring Diagram — AT — D/C . . . . . . . ... 189
Diagnostic Procedure . . . . . . . . . . ... 190
Component Inspection . . . . . . . . . . . 192

DTC P1764 DIRECT CLUTCH SOLENOID VALVE
FUNCTION . . . . . . . . . . . . . . . .. 193

Description . . . . . . . . . . . . . . ... 193
On Board Diagnosis Logic . . . . . . . . ... 193
Possible Cause . . . . . . . . . . . . . 193
DTC Confirmation Procedure . . . . . . . ... 193
Wiring Diagram — AT — D/CF . . . . . . . . 194
Diagnostic Procedure . . . . . . . . . . ... 195

DTC P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE . . . . . . . . . . . . . 197

Description . . . . . . . . . . . . . . ... 197
On Board Diagnosis Logic . . . . . . . . ... 197
Possible Cause . . . . . . . . . . . . . 197
DTC Confirmation Procedure . . . . . . . ... 197
Wiring Diagram — AT — HLR/C . . . . . . .. 198
Diagnostic Procedure . . . . . . . . . . ... 199
Component Inspection . . . . . . . . . . . 201

DTC P1769 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE FUNCTION . . . . . . . . 202

Description . . . . . . . . . . . . . . ... 202
On Board Diagnosis Logic . . . . . . . . ... 202
Possible Cause . . . . . . . . . . . . . 202
DTC Confirmation Procedure . . . . . . . ... 202

Wiring Diagram — AT — HLR/CF . . . . . . 203
Diagnostic Procedure . . . . . . . . . . ... 204

DTC P1772 LOW COAST BRAKE SOLENOID
VALVE . . . . . . . . . . . . . . . . . . 206

Description . . . . . . . . . . . . . . . 206
On Board Diagnosis Logic . . . . . . . . . 206
Possible Cause . . . . . . . . . . . . . . 206
DTC Confirmation Procedure . . . . . . . ... 206
Wiring Diagram — AT — LC/B . . . . . . . . 207
Diagnostic Procedure . . . . . . . . . . ... 208
Component Inspection . . . . . . . . . . .. 210

DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION . . . . . . . . . . . . .. 211

Description . . . . . . . . . . . . . . . 211
On Board Diagnosis Logic . . . . . . . . . 211
Possible Cause . . . . . . . . . . . . . . 211
DTC Confirmation Procedure . . . . . . . ... 211
Wiring Diagram — AT — LC/BF . . . . . . ... 212
Diagnostic Procedure . . . . . . . . . . ... 213

DTC P1815 MANUAL MODE SWITCH . . . . .. 215

Description . . . . . . . . . . . . . . . 215
CONSULT-II Reference Value in Data Monitor Mode

. 215

On Board Diagnosis Logic . . . . . . . . . 215
Possible Cause . . . . . . . . . . . . . . 215
DTC Confirmation Procedure . . . . . . . ... 215
Wiring Diagram — AT — MMSW . . . . . . . 216
Diagnostic Procedure . . . . . . . . . . ... 217
Component Inspection . . . . . . . . . . .. 218
Position Indicator Lamp . . . . . . . . . . 218

DTC P1841 ATF PRESSURE SWITCH 1 . . . ... 219

Description . . . . . . . . . . . . . . . 219
On Board Diagnosis Logic . . . . . . . . . 219
Possible Cause . . . . . . . . . . . . . . 219
DTC Confirmation Procedure . . . . . . . ... 219
Wiring Diagram — AT — FPSW1 . . . . . . . 220
Diagnostic Procedure . . . . . . . . . . ... 221

DTC P1843 ATF PRESSURE SWITCH 3 . . . ... 223

Description . . . . . . . . . . . . . . . 223
On Board Diagnosis Logic . . . . . . . . . 223
Possible Cause . . . . . . . . . . . . . . 223
DTC Confirmation Procedure . . . . . . . ... 223
Wiring Diagram — AT — FPSW3 . . . . . . . 224
Diagnostic Procedure . . . . . . . . . . ... 225

DTC P1845 ATF PRESSURE SWITCH 5 . . . ... 227

Description . . . . . . . . . . . . . . . 227
On Board Diagnosis Logic . . . . . . . . . 227
Possible Cause . . . . . . . . . . . . . . 227
DTC Confirmation Procedure . . . . . . . ... 227
Wiring Diagram — AT — FPSW5 . . . . . . . 228
Diagnostic Procedure . . . . . . . . . . ... 229

DTC P1846 ATF PRESSURE SWITCH 6 . . . ... 231

Description . . . . . . . . . . . . . . . 231
On Board Diagnosis Logic . . . . . . . . . 231
Possible Cause . . . . . . . . . . . . . . 231
DTC Confirmation Procedure . . . . . . . ... 231
Wiring Diagram — AT — FPSW6 . . . . . . . 232
Diagnostic Procedure . . . . . . . . . . ... 233

PARK/NEUTRAL POSITION, MANUAL MODE,

AT-4

BRAKE AND THROTTLE POSITION SWITCH CIR-
CUIT . . . . . . . . . . . . . . . . . . 235

Diagnostic Procedure . . . . . . . . . . ... 235

TROUBLE DIAGNOSIS FOR SYMPTOMS . . . 237

Wiring Diagram — AT — NONDTC . . . . . .. 237
A/T CHECK Indicator Lamp does not come on . 238
Engine Cannot Be Started In “P” or “N” Position .. 239
In “P” Position, Vehicle Moves When Pushed . .. 240
In “N” Position, Vehicle Moves . . . . . . . .. 241
Large Shock (“N” to “D” Position) . . . . . . . 242
Vehicle Does Not Creep Backward In “R” Position .245
Vehicle Does Not Creep Forward In “D” Position . 247
Vehicle Cannot Be Started From D

1

. . . . . . 251

A/T Does Not Shift: D

1

→

D

2

. . . . . . . . 253

A/T Does Not Shift: D

2

→

D

3

. . . . . . . . 255

A/T Does Not Shift: D

3

→

D

4

. . . . . . . . 258

A/T Does Not Shift: D

4

→

D

5

. . . . . . . . 260

A/T Does Not Perform Lock-up . . . . . . . 262
A/T Does Not Hold Lock-up Condition . . . . .. 265
Lock-up Is Not Released . . . . . . . . . .. 267
Engine Speed Does Not Return To Idle . . . . 268
Cannot Be Changed to Manual Mode . . . . .. 270
A/T Does Not Shift: 5th gear

→

4th gear . . . .. 271

A/T Does Not Shift: 4th gear

→

3rd gear . . . .. 273

A/T Does Not Shift: 3rd gear

→

2nd gear . . . . 275

A/T Does Not Shift: 2nd gear

→

1st gear . . . . 277

Vehicle Does Not Decelerate By Engine Brake . 279

SHIFT CONTROL SYSTEM . . . . . . . . . 281

Control Device Removal and Installation . . . .. 281
Adjustment of A/T Position . . . . . . . . ... 282
Checking of A/T Position . . . . . . . . . .. 282

A/T SHIFT LOCK SYSTEM . . . . . . . . . . 283

Description . . . . . . . . . . . . . . . 283
Shift Lock System Electrical Parts Location . . . 283
Wiring Diagram — AT — SHIFT . . . . . . ... 284
Shift Lock Control Unit Reference Values . . . . 286
Component Inspection . . . . . . . . . . .. 286

ON-VEHICLE SERVICE . . . . . . . . . . .. 289

Control Valve Assembly . . . . . . . . . . 289

AIR BREATHER HOSE . . . . . . . . . . ...295

Removal and Installation . . . . . . . . . ...295

TRANSMISSION ASSEMBLY . . . . . . . . .296

Removal and Installation . . . . . . . . . ...296

OVERHAUL . . . . . . . . . . . . . . . .299

Components . . . . . . . . . . . . . . ..299
Oil Channel . . . . . . . . . . . . . . ...305
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings . . . . . . ..306

DISASSEMBLY . . . . . . . . . . . . . ...307

Disassembly . . . . . . . . . . . . . . ..307

REPAIR FOR COMPONENT PARTS . . . . . ..321

Oil Pump . . . . . . . . . . . . . . . ...321
Front Sun Gear, 3rd One-Way Clutch . . . . ...323
Front Carrier, Input Clutch, Rear Internal Gear . .326
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub . . . . . . . . . . . ..331
High and Low Reverse Clutch . . . . . . . ..336
Direct Clutch . . . . . . . . . . . . . . .337

ASSEMBLY . . . . . . . . . . . . . . . .339

Assembly (1) . . . . . . . . . . . . . . .339
Adjustment . . . . . . . . . . . . . . . 349
Assembly (2) . . . . . . . . . . . . . . .351

SERVICE DATA AND SPECIFICATIONS (SDS) . 357

General Specifications . . . . . . . . . . ..357
Vehicle Speed When Shifting Gears . . . . . .357
Vehicle Speed When Performing and Releasing
Complete Lock-up . . . . . . . . . . . . .357
Vehicle Speed When Performing and Releasing
Slip Lock-up . . . . . . . . . . . . . . ..357
Stall Speed . . . . . . . . . . . . . . . 357
Line Pressure . . . . . . . . . . . . . . 358
Solenoid Valves . . . . . . . . . . . . . 358
A/T Fluid Temperature Sensor . . . . . . . ..358
Turbine Revolution Sensor . . . . . . . . . 358
Revolution Sensor . . . . . . . . . . . . .358
Reverse brake . . . . . . . . . . . . . ...359
Total End Play . . . . . . . . . . . . . ...359