2005 INFINITI QX4 engine

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Revision: October 20052005 QX56 DTC Confirmation Procedure ............................... 142
Diagnostic Procedure ........................................... 143
DTC P1757 FRONT BRAKE SOLENOID VALVE .. 144
Description ........................................................... 144
CONSULT-II Reference Value .............................. 144
On Board Diagnosis Logic ................................... 144
Possible Cause .................................................... 144
DTC Confirmation Procedure ............................... 144
Diagnostic Procedure ........................................... 145
DTC P1759 FRONT BRAKE SOLENOID VALVE
FUNCTION .............................................................. 146
Description ........................................................... 146
CONSULT-II Reference Value .............................. 146
On Board Diagnosis Logic ................................... 146
Possible Cause .................................................... 146
DTC Confirmation Procedure ............................... 146
Diagnostic Procedure ........................................... 147
DTC P1762 DIRECT CLUTCH SOLENOID VALVE . 148
Description ........................................................... 148
CONSULT-II Reference Value .............................. 148
On Board Diagnosis Logic ................................... 148
Possible Cause .................................................... 148
DTC Confirmation Procedure ............................... 148
Diagnostic Procedure ........................................... 149
DTC P1764 DIRECT CLUTCH SOLENOID VALVE
FUNCTION .............................................................. 150
Description ........................................................... 150
CONSULT-II Reference Value .............................. 150
On Board Diagnosis Logic ................................... 150
Possible Cause .................................................... 150
DTC Confirmation Procedure ............................... 150
Diagnostic Procedure ........................................... 151
DTC P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE ................................................. 152
Description ........................................................... 152
CONSULT-II Reference Value .............................. 152
On Board Diagnosis Logic ................................... 152
Possible Cause .................................................... 152
DTC Confirmation Procedure ............................... 152
Diagnostic Procedure ........................................... 153
DTC P1769 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE FUNCTION ............................. 154
Description ........................................................... 154
CONSULT-II Reference Value .............................. 154
On Board Diagnosis Logic ................................... 154
Possible Cause .................................................... 154
DTC Confirmation Procedure ............................... 154
Diagnostic Procedure ........................................... 155
DTC P1772 LOW COAST BRAKE SOLENOID
VALVE ..................................................................... 156
Description ........................................................... 156
CONSULT-II Reference Value .............................. 156
On Board Diagnosis Logic ................................... 156
Possible Cause .................................................... 156
DTC Confirmation Procedure ............................... 156
Diagnostic Procedure ........................................... 157
DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION ................................................. 158
Description ........................................................... 158CONSULT-II Reference Value ..............................158
On Board Diagnosis Logic ....................................158
Possible Cause .....................................................158
DTC Confirmation Procedure ...............................158
Diagnostic Procedure ...........................................159
DTC P1841 ATF PRESSURE SWITCH 1 ...............160
Description ............................................................160
CONSULT-II Reference Value ..............................160
On Board Diagnosis Logic ....................................160
Possible Cause .....................................................160
DTC Confirmation Procedure ...............................160
Diagnostic Procedure ...........................................161
DTC P1843 ATF PRESSURE SWITCH 3 ...............162
Description ............................................................162
CONSULT-II Reference Value ..............................162
On Board Diagnosis Logic ....................................162
Possible Cause .....................................................162
DTC Confirmation Procedure ...............................162
Diagnostic Procedure ...........................................163
DTC P1845 ATF PRESSURE SWITCH 5 ...............164
Description ............................................................164
CONSULT-II Reference Value ..............................164
On Board Diagnosis Logic ....................................164
Possible Cause .....................................................164
DTC Confirmation Procedure ...............................164
Diagnostic Procedure ...........................................165
DTC P1846 ATF PRESSURE SWITCH 6 ...............166
Description ............................................................166
CONSULT-II Reference Value ..............................166
On Board Diagnosis Logic ....................................166
Possible Cause .....................................................166
DTC Confirmation Procedure ...............................166
Diagnostic Procedure ...........................................167
MAIN POWER SUPPLY AND GROUND CIRCUIT .168
Wiring Diagram — AT — MAIN ............................168
Diagnostic Procedure ...........................................169
CLOSED THROTTLE POSITION AND WIDE OPEN
THROTTLE POSITION CIRCUIT ............................172
CONSULT-II Reference Value ..............................172
Diagnostic Procedure ...........................................172
BRAKE SIGNAL CIRCUIT ......................................173
CONSULT-II Reference Value ..............................173
Diagnostic Procedure ...........................................173
TOW MODE SWITCH .............................................174
Description ............................................................174
Wiring Diagram — AT — TMSW ..........................175
Diagnostic Procedure ...........................................176
TROUBLE DIAGNOSIS FOR SYMPTOMS ............177
Wiring Diagram — AT — NONDTC ......................177
A/T CHECK Indicator Lamp Does Not Come On . 180
Engine Cannot Be Started In “P” or “N” Position ..180
In “P” Position, Vehicle Moves When Pushed ......181
In “N” Position, Vehicle Moves ..............................182
Large Shock (“N” to “D” Position) .........................183
Vehicle Does Not Creep Backward In “R” Position .187
Vehicle Does Not Creep Forward In “D” Position . 190
Vehicle Cannot Be Started From D
1 .....................192
A/T Does Not Shift: D
1 → D2 ................................195
A/T Does Not Shift: D
2 → D3 ................................197

AT-4Revision: October 20052005 QX56 A/T Does Not Shift: D
3 → D4 ................................199
A/T Does Not Shift: D
4 → D5 ................................202
A/T Does Not Perform Lock-up ............................204
A/T Does Not Hold Lock-up Condition ..................206
Lock-up Is Not Released ......................................208
Engine Speed Does Not Return to Idle ................209
A/T Does Not Shift: 5th gear → 4th gear ..............210
A/T Does Not Shift: 4th gear → 3rd gear ..............213
A/T Does Not Shift: 3rd gear → 2nd gear .............214
A/T Does Not Shift: 2nd gear → 1st gear .............216
Vehicle Does Not Decelerate By Engine Brake ....219
A/T SHIFT LOCK SYSTEM .....................................222
Description ............................................................222
Shift Lock System Electrical Parts Location .........222
Wiring Diagram — A/T — SHIFT ..........................223
Shift Lock Control Unit Reference Values .............224
Component Inspection ..........................................225
SHIFT CONTROL SYSTEM ....................................227
Control Device Removal and Installation ..............227
Adjustment of A/T Position ...................................228
Checking of A/T Position ......................................228
ON-VEHICLE SERVICE ..........................................229
Oil Pan ..................................................................229
Control Valve With TCM and A/T Fluid Temperature
Sensor 2 ...............................................................231
Rear Oil Seal ........................................................241
AIR BREATHER HOSE ...........................................242
Removal and Installation ......................................242
TRANSMISSION ASSEMBLY ................................244
Removal and Installation (4x2) .............................244
Removal and Installation (4x4) .............................247
OVERHAUL .............................................................250Components .......................................................... 250
Oil Channel ........................................................... 258
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings .......................... 260
DISASSEMBLY ....................................................... 262
Disassembly .......................................................... 262
REPAIR FOR COMPONENT PARTS ...................... 280
Oil Pump ............................................................... 280
Front Sun Gear, 3rd One-Way Clutch ................... 282
Front Carrier, Input Clutch, Rear Internal Gear ..... 284
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub .............................................. 289
High and Low Reverse Clutch .............................. 294
Direct Clutch ......................................................... 296
ASSEMBLY ............................................................. 298
Assembly (1) ......................................................... 298
Adjustment ............................................................311
Assembly (2) ......................................................... 314
SERVICE DATA AND SPECIFICATIONS (SDS) .... 321
General Specifications .......................................... 321
Vehicle Speed When Shifting Gears ..................... 321
Vehicle Speed When Performing and Releasing
Complete Lock-up ................................................. 322
Vehicle Speed When Performing and Releasing
Slip Lock-up .......................................................... 322
Stall Speed ............................................................ 322
Line Pressure ........................................................ 322
A/T Fluid Temperature Sensor .............................. 322
Turbine Revolution Sensor .................................... 322
Vehicle Speed Sensor A/T (Revolution Sensor) ... 322
Reverse brake ....................................................... 323
Total End Play ....................................................... 323

INDEX FOR DTC
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Revision: October 20052005 QX56
INDEX FOR DTCPFP:00024
Alphabetical Index ECS0 0CD H
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
AT-9 5, "
DTC U1000 CAN COMMUNICATION LINE" .
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.Items
(CONSULT- II screen terms) DTC
Reference page OBD- II Except OBD- II
CONSULT- II GST (*1) CONSULT- II only “A/T”
A/T 1ST E/BRAKING — P1731AT- 1 3 8
ATF PRES SW 1/CIRC — P1841AT- 1 6 0
ATF PRES SW 3/CIRC — P1843AT- 1 6 2
ATF PRES SW 5/CIRC — P1845AT- 1 6 4
ATF PRES SW 6/CIRC — P1846AT- 1 6 6
A/T INTERLOCK P1730 P1730AT- 1 3 5
A/T TCC S/V FNCTN P0744 P0744 AT- 11 7
ATF TEMP SEN/CIRC P0710 P1710AT- 1 2 6
CAN COMM CIRCUIT U1000 U1000AT- 9 5
D/C SOLENOID/CIRC P1762 P1762AT- 1 4 8
D/C SOLENOID FNCTN P1764 (*2 ) P1764 AT- 1 5 0
ENGINE SPEED SIG — P0725AT- 11 3
FR/B SOLENOID/CIRC P1757 P1757AT- 1 4 4
FR/B SOLENOID FNCT P1759 P1759 AT- 1 4 6
HLR/C SOL/CIRC P1767 P1767AT- 1 5 2
HLR/C SOL FNCTN P1769 (*2 ) P1769 AT- 1 5 4
I/C SOLENOID/CIRC P1752 P1752AT- 1 4 0
I/C SOLENOID FNCTN P1754 (*2 ) P1754 AT- 1 4 2
L/PRESS SOL/CIRC P0745 P0745AT- 11 9
LC/B SOLENOID/CIRC P1772 P1772AT- 1 5 6
LC/B SOLENOID FNCT P1774 P1774 AT- 1 5 8
PNP SW/CIRC P0705 P0705AT- 1 0 4
STARTER RELAY/CIRC — P0615AT- 9 9
TCC SOLENOID/CIRC P0740 P0740AT- 11 5
TCM P0700 P0700AT- 1 0 3
TCM·RAM — P1702AT- 1 2 1
TCM·ROM — P1703AT- 1 2 2
TP SEN/CIRC A/T — P1705AT- 1 2 3
TURBINE REV S/CIRC P1716 P1716AT- 1 3 1
VEH SPD SE/CIR·MTR — P1721AT- 1 3 3
VEH SPD SEN/CIR AT P0720 P0720AT- 1 0 8

AT-6
INDEX FOR DTC
Revision: October 20052005 QX56
DTC No. Index ECS00CDI
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 9 5 , "
DTC U1000 CAN COMMUNICATION LINE" .
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.DTC
Items
(CONSULT- II screen terms)Reference page OBD- II Except OBD- II
CONSULT- II
GST (*1)C O N S U LT- I I
only “A/T”
— P0615 STARTER RELAY/CIRCAT- 9 9
P0700 P0700 TCMAT- 1 0 3
P0705 P0705 PNP SW/CIRCAT- 1 0 4
P0710 P1710 ATF TEMP SEN/CIRCAT- 1 2 6
P0720 P0720 VEH SPD SEN/CIR ATAT- 1 0 8
— P0725 ENGINE SPEED SIGAT-11 3
P0740 P0740 TCC SOLENOID/CIRCAT-11 5
P0744 P0744 A/T TCC S/V FNCTNAT-11 7
P0745 P0745 L/PRESS SOL/CIRCAT-11 9
— P1702 TCM·RAMAT- 1 2 1
— P1703 TCM·ROMAT- 1 2 2
— P1705 TP SEN/CIRC A/TAT- 1 2 3
P1716 P1716 TURBINE REV S/CIRCAT- 1 3 1
— P1721 VEH SPD SE/CIR·MTRAT- 1 3 3
P1730 P1730 A/T INTERLOCKAT- 1 3 5
— P1731 A/T 1ST E/BRAKINGAT- 1 3 8
P1752 P1752 I/C SOLENOID/CIRCAT- 1 4 0
P1754 (*2 ) P1754 I/C SOLENOID FNCTNAT- 1 4 2
P1757 P1757 FR/B SOLENOID/CIRCAT- 1 4 4
P1759 (*2 ) P1759 FR/B SOLENOID FNCTAT- 1 4 6
P1762 P1762 D/C SOLENOID/CIRCAT- 1 4 8
P1764 (*2 ) P1764 D/C SOLENOID FNCTNAT- 1 5 0
P1767 P1767 HLR/C SOL/CIRCAT- 1 5 2
P1769 P1769 HLR/C SOL FNCTNAT- 1 5 4
P1772 P1772 LC/B SOLENOID/CIRCAT- 1 5 6
P1774 P1774 LC/B SOLENOID FNCTAT- 1 5 8
— P1841 ATF PRES SW 1/CIRCAT- 1 6 0
— P1843 ATF PRES SW 3/CIRCAT- 1 6 2
— P1845 ATF PRES SW 5/CIRCAT- 1 6 4
— P1846 ATF PRES SW 6/CIRCAT- 1 6 6
U1000 U1000 CAN COMM CIRCUITAT- 9 5

PRECAUTIONS
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Revision: October 20052005 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
ECS00CDJ
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WA RN ING:

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 must be per-
formed by an authorized NISSAN/INFINITI dealer.

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 SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for On Board Diagnostic (OBD) System of A/T and EngineECS00CDK
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:

Be sure to turn the ignition switch “OFF” and disconnect the negative battery cable before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves,
etc. Will cause the MIL to light up.

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.)

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.

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.

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

A/T CONTROL SYSTEM
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Revision: October 20052005 QX56
“D”, “4”, “3”, “2” Positions 1st Gear

The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.

The 1st one-way clutch regulates reverse rotation of the rear sun gear.

The 3rd one-way clutch regulates reverse rotation of the front sun gear.

During deceleration, the mid sun gear turns forward, so the forward one-way clutch idles and the engine
brake is not activated.
1. Front brake 2. Input clutch 3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear 12. Input shaft
13. Mid internal gear 14. Front internal gear 15. Rear carrier
16. Rear sun gear 17. Mid sun gear 18. Front carrier
19. Mid carrier 20. Rear internal gear 21. Output shaft
22. Parking gear 23. Parking pawl
SCIA1512E

AT-22
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
“1 ” Position 1st Gear

The front brake fastens the front sun gear.

The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.

High and low reverse clutch connects the rear sun gear and the mid sun gear.

The low coast brake fastens the mid sun gear.

During deceleration, the low coast brake regulates forward rotation of the mid sun gear and the engine
brake functions.
1. Front brake 2. Input clutch 3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear 12. Input shaft
13. Mid internal gear 14. Front internal gear 15. Rear carrier
16. Rear sun gear 17. Mid sun gear 18. Front carrier
19. Mid carrier 20. Rear internal gear 21. Output shaft
22. Parking gear 23. Parking pawl
SCIA1513E

A/T CONTROL SYSTEM
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Revision: October 20052005 QX56
“D”, “4”, “3” Positions 2nd Gear

The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.

The 3rd one-way clutch regulates reverse rotation of the front sun gear.

The direct clutch is coupled and the rear carrier and rear sun gear are connected.

During deceleration, the mid sun gear turns forward, so the forward one-way clutch idles and engine
brake is not activated.
1. Front brake 2. Input clutch 3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear 12. Input shaft
13. Mid internal gear 14. Front internal gear 15. Rear carrier
16. Rear sun gear 17. Mid sun gear 18. Front carrier
19. Mid carrier 20. Rear internal gear 21. Output shaft
22. Parking gear 23. Parking pawl
SCIA1514E