4WD INFINITI QX4 2005 Factory Service Manual

AT-1
AUTOMATIC TRANSMISSION
C TRANSMISSION/TRANSAXLE
CONTENTS
D
E
F
G
H
I
J
K
L
M
SECTION AT
A
B
AT
Revision: October 20052005 QX56 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
Wiring Diagrams and Trouble Diagnosis .................. 9
PREPARATION ......................................................... 10
Special Service Tools ............................................. 10
Commercial Service Tools ...................................... 12
A/T FLUID ................................................................. 13
Changing A/T Fluid ................................................ 13
Checking A/T Fluid ................................................. 13
A/T Fluid Cooler Cleaning ...................................... 13
A/T CONTROL SYSTEM .......................................... 16
Cross-Sectional View (2WD models) ..................... 16
Cross-Sectional View (4WD models) ..................... 17
Shift Mechanism ..................................................... 18
TCM Function ......................................................... 29
CAN Communication .............................................. 30
Input/Output Signal of TCM .................................... 30
Line Pressure Control ............................................ 31
Shift Control ........................................................... 32
Lock-up Control ...................................................... 33
Engine Brake Control ............................................. 35
Control Valve .......................................................... 35
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 37
Introduction ............................................................ 37
OBD-II Function for A/T System ............................. 37
One or Two Trip Detection Logic of OBD-II ............ 37
OBD-II Diagnostic Trouble Code (DTC) ................. 37
Malfunction Indicator Lamp (MIL) ........................... 40
TROUBLE DIAGNOSIS ............................................ 41
DTC Inspection Priority Chart ................................ 41
Fail-Safe ................................................................. 41How To Perform Trouble Diagnosis For Quick and
Accurate Repair ...................................................... 43
A/T Electrical Parts Location .................................. 48
Circuit Diagram ....................................................... 49
Inspections Before Trouble Diagnosis .................... 50
Check Before Engine is Started .............................. 54
Check at Idle ........................................................... 54
Cruise Test - Part 1 ................................................. 55
Cruise Test - Part 2 ................................................. 57
Cruise Test - Part 3 ................................................. 58
Vehicle Speed When Shifting Gears ...................... 59
Vehicle Speed When Performing and Releasing
Complete Lock-up .................................................. 59
Vehicle Speed When Performing and Releasing
Slip Lock-up ............................................................ 59
Symptom Chart ....................................................... 60
TCM Input/Output Signal Reference Values ........... 82
CONSULT-II Function (A/T) .................................... 83
DTC U1000 CAN COMMUNICATION LINE .............. 95
Description .............................................................. 95
On Board Diagnosis Logic ...................................... 95
Possible Cause ....................................................... 95
DTC Confirmation Procedure ................................. 95
Wiring Diagram — AT — CAN ................................ 96
Diagnostic Procedure ............................................. 98
DTC P0615 START SIGNAL CIRCUIT ..................... 99
Description .............................................................. 99
CONSULT-II Reference Value ................................ 99
On Board Diagnosis Logic ...................................... 99
Possible Cause ....................................................... 99
DTC Confirmation Procedure ................................. 99
Wiring Diagram — AT — STSIG ..........................100
Diagnostic Procedure ...........................................101
DTC P0700 TCM .....................................................103
Description ............................................................103
On Board Diagnosis Logic ....................................103
Possible Cause .....................................................103
DTC Confirmation Procedure ...............................103
Diagnostic Procedure ...........................................103
DTC P0705 PARK/NEUTRAL POSITION SWITCH .104

AT-12
PREPARATION
Revision: October 20052005 QX56
Commercial Service ToolsECS00CDP
Tool nameDescription
Power toolLoosening bolts and nuts
DriftInstalling manual shaft seals
a: 22 mm (0.87 in) dia.
DriftInstalling rear oil seal (4WD models)
a: 64 mm (2.52 in) dia.
PBIC0190E
NT083
SCIA5338E

A/T CONTROL SYSTEM
AT-17
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
Cross-Sectional View (4WD models)ECS0 0CD U
1. Front planetary gear 2. Mid planetary gear 3. Rear planetary gear
4. Direct clutch 5. High and low reverse clutch 6. Reverse brake
7. Drum support 8. Forward brake 9. Low coast brake
10. Input shaft 11. Torque converter 12. Oil pump
13. Front brake 14. 3rd one-way clutch 15. Input clutch
16. 1st one-way clutch 17. Control valve with TCM 18. Forward one-way clutch
19. Adapter case 20. Output shaft
SCIA5268E

ON-VEHICLE SERVICE
AT-241
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
Rear Oil SealECS00CKY
REMOVAL AND INSTALLATION
Removal
1. Remove rear propeller shaft. Refer to PR-5, "REMOVAL" .
2. Remove transfer from transmission (4WD models). Refer to TF-
143, "REMOVAL" .
3. Remove rear oil seal using a flat-bladed screwdriver or suitable
tool.
CAUTION:
Be careful not to scratch rear extension assembly (2WD
models) or adapter case assembly (4WD models).
Installation
CAUTION:
After completing installation, check for A/T fluid leakage and fluid level. Refer to MA-24, "
Changing A/
T Fluid" , MA-22, "Checking A/T Fluid" .
1. Install new rear oil seal into the extension case (2WD models) or
adapter case (4WD models) until it is flush with component face,
using Tool or suitable drift.
CAUTION:

Apply ATF to rear oil seal.

Do not reuse rear oil seal.
2. Install transfer to transmission (4WD models). Refer to TF-143,
"INSTALLATION" .
3. Install rear propeller shaft. Refer to PR-9, "
INSTALLATION"
SCIA5254E
SCIA5583E

AT-256
OVERHAUL
Revision: October 20052005 QX56
4WD models
SCIA5664E
1. Rear oil seal 2. Bracket 3. Adapter case
4. Parking actuator support 5. Return spring 6. Parking pawl

OVERHAUL
AT-259
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
4WD models
SCIA5189E

OVERHAUL
AT-261
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
4WD models
SCIA5197E

AT-262
DISASSEMBLY
Revision: October 20052005 QX56
DISASSEMBLYPFP:31020
DisassemblyECS00CL5
CAUTION:
Do not disassemble parts behind Drum Support. Refer to AT-1 6, "
Cross-Sectional View (2WD models)"
or AT-17, "Cross-Sectional View (4WD models)" .
1. Drain ATF through drain plug.
2. Remove torque converter by holding it firmly and turing while
pulling straight out.
3. Check torque converter one-way clutch using check tool as
shown.
a. Insert check tool into the groove of bearing support built into
one-way clutch outer race.
b. When fixing bearing support with check tool, rotate one- way
clutch spline using screwdriver.
c. Check that inner race rotates clockwise only. If not, replace
torque converter assembly.
4. Remove converter housing from transmission case.
CAUTION:
Be careful not to scratch converter housing.
SCIA5010E
SCIA3171E
SCIA5171E

AT-270
DISASSEMBLY
Revision: October 20052005 QX56
37. Remove O-ring from A/T assembly harness connector.
38. Disconnect TCM connectors.
CAUTION:
Be careful not to damage connectors.
39. Remove A/T assembly harness connector from control valve
with TCM using flat blade screwdriver.
40. Disconnect TCM connector and park/neutral position switch
connector.
CAUTION:
Be careful not to damage connectors.
41. Remove rear extension assembly (2WD models) or adapter case assembly (4WD models) according to
the following procedures.
SCIA5155E
SCIA5447E
SCIA5448E
SCIA5449E

DISASSEMBLY
AT-271
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
a.2WD models
i. Remove tightening bolts for rear extension assembly and trans-
mission case.
ii. Remove bracket.
iii. Tap rear extension assembly with soft hammer.
iv. Remove rear extension assembly from transmission case. (With
needle bearing)
b.4WD models
i. Remove tightening bolts for adapter case assembly and trans-
mission case.
ii. Remove bracket.
SCIA5349E
SCIA5028E
SCIA5029E
SCIA5203E