Infiniti Q45 (FY33). Manual — part 1

AUTOMATIC TRANSMISSION

SECTION

AT

CONTENTS

DIAGNOSTIC TROUBLE CODE INDEX. . . . . . .3

Alphabetical & P No. Index for DTC . . . . . . ...3

PRECAUTIONS AND PREPARATION. . . . . . . 4

Precautions for Supplemental Restraint System
(SRS)

″

AIR BAG

″

and

″

SEAT BELT

PRE-TENSIONER

″

. . . . . . . . . . . . . ..4

Precautions for On Board Diagnostic (OBD)
System of A/T and Engine. . . . . . . . . . ...4
Precautions . . . . . . . . . . . . . . . . ..5
Service Notice or Precautions . . . . . . . . . .6
Special Service Tools . . . . . . . . . . . . ..8

OVERALL SYSTEM . . . . . . . . . . . . . ..10

A/T Electrical Parts Location . . . . . . . . . .10
Circuit Diagram . . . . . . . . . . . . . . .. 11
Wiring Diagram . . . . . . . . . . . . . . ..12
Cross-sectional View . . . . . . . . . . . . .18
Hydraulic Control Circuits . . . . . . . . . . ..19
Shift Mechanism . . . . . . . . . . . . . . 20
Control System . . . . . . . . . . . . . . ..29
Control Mechanism. . . . . . . . . . . . . 31
Control Valve . . . . . . . . . . . . . . . .36

ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION . . . . . . . . . . . . . . . ...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). . . . . . . ..42
CONSULT-II . . . . . . . . . . . . . . . ...42
Diagnostic Procedure without CONSULT-II. . . ...49

TROUBLE DIAGNOSIS - Introduction . . . . . . 54

Introduction . . . . . . . . . . . . . . . . 54
Diagnostic Worksheet. . . . . . . . . . . . 55
Work Flow. . . . . . . . . . . . . . . . ..58

TROUBLE DIAGNOSIS - Basic Inspection . . . . 59

A/T Fluid Check . . . . . . . . . . . . . . .59
Stall Test . . . . . . . . . . . . . . . . . 59
Line Pressure Test. . . . . . . . . . . . . .62
Road Test. . . . . . . . . . . . . . . . ...64

TROUBLE DIAGNOSIS - General Description. . ...74

Symptom Chart. . . . . . . . . . . . . . ..74

TCM Terminals and Reference Value. . . . . . 77

TROUBLE DIAGNOSIS FOR DTC P0705. . . . . 81

Park/Neutral Position (PNP) Switch . . . . . . ..81

TROUBLE DIAGNOSIS FOR DTC P0710. . . . . 85

A/T Fluid Temperature Sensor. . . . . . . . ...85

TROUBLE DIAGNOSIS FOR DTC P0720. . . . . 89

Vehicle Speed Sensor

⋅

A/T (Revolution sensor) . . 89

TROUBLE DIAGNOSIS FOR DTC P0725. . . . . 92

Engine Speed Signal . . . . . . . . . . . . .92

TROUBLE DIAGNOSIS FOR DTC P0731. . . . . 95

A/T 1st Gear Function . . . . . . . . . . . ...95

TROUBLE DIAGNOSIS FOR DTC P0732. . . . ..100

A/T 2nd Gear Function . . . . . . . . . . . 100

TROUBLE DIAGNOSIS FOR DTC P0733. . . . ..104

A/T 3rd Gear Function. . . . . . . . . . . .104

TROUBLE DIAGNOSIS FOR DTC P0734. . . . ..108

A/T 4th Gear Function . . . . . . . . . . . .108

TROUBLE DIAGNOSIS FOR DTC P0740. . . . .. 114

Torque Converter Clutch Solenoid Valve . . . . 114

TROUBLE DIAGNOSIS FOR DTC P0744. . . . .. 118

A/T TCC S/V Function (Lock-up). . . . . . . . 118

TROUBLE DIAGNOSIS FOR DTC P0745. . . . ..125

Line Pressure Solenoid Valve . . . . . . . . .125

TROUBLE DIAGNOSIS FOR DTC P0750. . . . ..129

Shift Solenoid Valve A . . . . . . . . . . . .129

TROUBLE DIAGNOSIS FOR DTC P0755. . . . ..133

Shift Solenoid Valve B . . . . . . . . . . . .133

TROUBLE DIAGNOSIS FOR DTC P1705. . . . ..137

Throttle Position Sensor . . . . . . . . . . ..137

TROUBLE DIAGNOSIS FOR DTC P1760. . . . ..143

Overrun Clutch Solenoid Valve . . . . . . . ...143

TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP
SEN . . . . . . . . . . . . . . . . . . . ..147

A/T Fluid Temperature Sensor Circuit and TCM
Power Source . . . . . . . . . . . . . . ..147

TROUBLE DIAGNOSIS FOR VHCL SPEED
SEN

⋅

MTR . . . . . . . . . . . . . . . . . .151

Vehicle Speed Sensor

⋅

MTR . . . . . . . . . 151

TROUBLE DIAGNOSIS FOR TURBINE REV . . . 154

Turbine Revolution Sensor . . . . . . . . . ..154

TROUBLE DIAGNOSIS FOR A/T COMM LINE . . .157

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

A/T Communication Line . . . . . . . . . . .157

CONTROL UNIT (RAM), CONTROL UNIT (ROM) . .160

TCM (Transmission Control Module). . . . . ...160

TROUBLE DIAGNOSES FOR SYMPTOMS. . . ...162

1. O/D OFF Indicator Lamp Does Not Come On. 162
2. Engine Cannot Be Started In

″

P

″

and

″

N

″

Position . . . . . . . . . . . . . . . . . 163
3. In

″

P

″

Position, Vehicle Moves Forward Or

Backward When Pushed . . . . . . . . . . .163
4. In

″

N

″

Position, Vehicle Moves . . . . . . ...164

5. Large Shock.

″

N

″

->

″

R

″

Position . . . . . ...165

6. Vehicle Does Not Creep Backward In

″

R

″

Position . . . . . . . . . . . . . . . . . 166
7. Vehicle Does Not Creep Forward In

″

D

″

,

″

2

″

Or

″

1

″

Position. . . . . . . . . . . . . . .167

8. Vehicle Cannot Be Started From D

1

. . . . ...168

9. A/T Does Not Shift: D

1

-> D

2

Or Does Not

Kickdown: D

4

-> D

2

. . . . . . . . . . . . ..169

10. A/T Does Not Shift: D

2

-> D

3

. . . . . . . .170

11. A/T Does Not Shift: D

3

-> D

4

. . . . . . . .171

12. A/T Does Not Perform Lock-up . . . . . . .172
13. A/T Does Not Hold Lock-up Condition . . . ..173
14. Lock-up Is Not Released. . . . . . . . ...173
15. Engine Speed Does Not Return To Idle (Light
Braking D

4

-> D

3

). . . . . . . . . . . . . .174

16. Vehicle Does Not Start From D

1

. . . . . ...175

17. A/T Does Not Shift: D

4

-> D

3

, When

Overdrive Control Switch

″

ON

″

->

″

OFF

″

. . . ...175

18. A/T Does Not Shift: D

3

-> 2

2

, When Selector

Lever

″

D

″

->

″

2

″

Position. . . . . . . . . . .176

19. A/T Does Not Shift: 2

2

-> 1

1

, When Selector

Lever

″

2

″

->

″

1

″

Position . . . . . . . . . . .176

20. Vehicle Does Not Decelerate By Engine
Brake. . . . . . . . . . . . . . . . . . 177
21. TCM Self-diagnosis Does Not Activate (Park/
Neutral Position, Overdrive Control and Throttle
Position Switch Circuit Checks). . . . . . . ...177

TROUBLE DIAGNOSES - A/T Shift Lock System ...183

A/T Shift Lock System . . . . . . . . . . . .183
Wiring Diagram . . . . . . . . . . . . . . 184
Diagnostic Procedure 1 . . . . . . . . . . ...185
Diagnostic Procedure 2 . . . . . . . . . . ...189
Shift Lock Control Unit Inspection . . . . . . ...192
Shift Lock Control Unit Inspection Table . . . . .192

Component Check . . . . . . . . . . . . ...193

ON-VEHICLE SERVICE . . . . . . . . . . . ..195

Control Valve Assembly and Accumulators. . . .195
Turbine Revolution Sensor Replacement. . . . 195
Revolution Sensor Replacement . . . . . . . .196
Rear Oil Seal Replacement. . . . . . . . . .196
Parking Pawl Components Inspection. . . . . .196
Park/Neutral Position (PNP) Switch Adjustment . .197
Manual Control Linkage Adjustment. . . . . . 197

REMOVAL AND INSTALLATION . . . . . . . . 198

Removal. . . . . . . . . . . . . . . . ...198
Installation. . . . . . . . . . . . . . . . 199

MAJOR OVERHAUL . . . . . . . . . . . . ...201

Oil Channel . . . . . . . . . . . . . . . ..203
Locations of Needle Bearings, Thrust Washers
and Snap Rings . . . . . . . . . . . . . ...204

DISASSEMBLY. . . . . . . . . . . . . . . 205
REPAIR FOR COMPONENT PARTS. . . . . . ..217

Oil Pump . . . . . . . . . . . . . . . . ..217
Control Valve Assembly. . . . . . . . . . ...221
Control Valve Upper Body . . . . . . . . . ...227
Control Valve Lower Body . . . . . . . . . ...232
Reverse Clutch . . . . . . . . . . . . . . 234
High Clutch . . . . . . . . . . . . . . . ..238
Forward and Overrun Clutches . . . . . . . ...240
Low & Reverse Brake. . . . . . . . . . . ..244
Forward Clutch Drum Assembly. . . . . . . ..248
Rear Internal Gear and Forward Clutch Hub . . ..250
Band Servo Piston Assembly . . . . . . . . ..252
Parking Pawl Components . . . . . . . . . ..256

ASSEMBLY. . . . . . . . . . . . . . . . ..258

Assembly (1). . . . . . . . . . . . . . . 258
Adjustment . . . . . . . . . . . . . . . ...266
Assembly (2). . . . . . . . . . . . . . . 268

SERVICE DATA AND SPECIFICATIONS (SDS) . . 276

General Specifications. . . . . . . . . . . .276
Specifications and Adjustment. . . . . . . . .276
Shift Solenoid Valves. . . . . . . . . . . ...280
Solenoid Valves . . . . . . . . . . . . . ...280
A/T Fluid Temperature Sensor. . . . . . . . .280
Turbine Revolution Sensor . . . . . . . . . ..280
Revolution Sensor . . . . . . . . . . . . ...280
Dropping Resistor . . . . . . . . . . . . . 280

When you read wiring diagrams:

I

Read GI section, “HOW TO READ WIRING DIAGRAMS”.

I

See EL section, “POWER SUPPLY ROUTING” for power distribution circuit.

When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW
CHART IN TROUBLE DIAGNOSES” and “HOW TO PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENT”.

CONTENTS

(Cont’d)

AT-2

Alphabetical & P No. Index for DTC

ALPHABETICAL INDEX FOR DTC

Items

(CONSULT-II screen

terms)

DTC

Reference

page

ECM*1

CONSULT-II

GST*2

A/T 1ST GR FNCTN

1103

P0731

AT-95

A/T 2ND GR FNCTN

1104

P0732

AT-100

A/T 3RD GR FNCTN

1105

P0733

AT-104

A/T 4TH GR FNCTN

1106

P0734

AT-108

A/T TCC S/V FNCTN

1107

P0744

AT-118

ATF TEMP SEN/CIRC

1208

P0710

AT-85

ENGINE SPEED SIG

1207

P0725

AT-92

L/PRESS SOL/CIRC

1205

P0745

AT-125

O/R CLTCH SOL/CIRC

1203

P1760

AT-143

PNP SW/CIRC

1101

P0705

AT-81

SFT SOL A/CIRC*3

1108

P0750

AT-129

SFT SOL B/CIRC*3

1201

P0755

AT-133

TCC SOLENOID/CIRC

1204

P0740

AT-114

TP SEN/CIRC A/T*3

1206

P1705

AT-137

VEH SPD SEN/CIR AT*4

1102

P0720

AT-89

*1: In Diagnostic Test Mode II (Self-diagnostic results),

these numbers are controlled by NISSAN.

*2: These numbers are prescribed by SAE J2012.
*3: When the fail-safe operation occurs, the MIL illuminates.
*4: The MIL illuminates when both the “Revolution sensor sig-

nal” and the “Vehicle speed sensor signal” meet the fail-
safe condition at the same time.

P NO. INDEX FOR DTC

DTC

Items

(CONSULT-II screen

terms)

Reference

page

CONSULT-II

GST*2

ECM*1

P0705

1101

PNP SW/CIRC

AT-81

P0710

1208

ATF TEMP SEN/CIRC

AT-85

P0720

1102

VEH SPD SEN/CIR AT*4

AT-89

P0725

1207

ENGINE SPEED SIG

AT-92

P0731

1103

A/T 1ST GR FNCTN

AT-95

P0732

1104

A/T 2ND GR FNCTN

AT-100

P0733

1105

A/T 3RD GR FNCTN

AT-104

P0734

1106

A/T 4TH GR FNCTN

AT-108

P0740

1204

TCC SOLENOID/CIRC

AT-114

P0744

1107

A/T TCC S/V FNCTN

AT-118

P0745

1205

L/PRESS SOL/CIRC

AT-125

P0750

1108

SFT SOL A/CIRC*3

AT-129

P0755

1201

SFT SOL B/CIRC*3

AT-133

P1705

1206

TP SEN/CIRC A/T*3

AT-137

P1760

1203

O/R CLTCH SOL/CIRC

AT-143

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

DIAGNOSTIC TROUBLE CODE INDEX

AT-3

Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT
PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” 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 INFINITI Q45 is as follows:

I

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), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.

I

For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), 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 the RS section of this Service Manual.

WARNING:

I

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 INFINITI dealer.

I

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.

I

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 (except satellite sensor and side air bag mod-
ule) covered with yellow insulation tape either just before the harness connectors or for the com-
plete harness are related to the SRS.

Precautions for On Board Diagnostic (OBD)
System of A/T and Engine

The 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:

I

Be sure to turn the ignition switch “OFF” 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.

I

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.)

I

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.

I

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.

I

Be sure to erase the unnecessary malfunction information (repairs completed) from the TCM and
ECM before returning the vehicle to the customer.

PRECAUTIONS AND PREPARATION

AT-4