2005 INFINITI QX4 check transmission fluid

AT-1
AUTOMATIC TRANSMISSION
C TRANSMISSION/TRANSAXLE
CONTENTS
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SECTION AT
A
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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-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

AT-8
PRECAUTIONS
Revision: October 20052005 QX56
Precautions ECS00CDL

Before connecting or disconnecting the A/T assembly har-
ness connector, turn ignition switch “OFF” and disconnect
negative battery cable. Because battery voltage is applied
to TCM even if ignition switch is turned “OFF”.

After performing each TROUBLE DIAGNOSIS, perform
“DTC (Diagnostic Trouble Code) CONFIRMATION PROCE-
DURE”.
If the repair is completed the DTC should not be displayed
in the “DTC CONFIRMATION PROCEDURE”.

Always use the specified brand of ATF. Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

Use paper rags not cloth rags during work.

After replacing the ATF, dispose of the waste oil using the methods prescribed by law, ordinance, etc.

Before proceeding with disassembly, thoroughly clean the outside of the transmission. It is important to
prevent the internal parts from becoming contaminated by dirt or other foreign matter.

Disassembly should be done in a clean work area.

Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transmission.

Place disassembled parts in order for easier and proper assembly.

All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.

Gaskets, seals and O-rings should be replaced any time the transmission is disassembled.

It is very important to perform functional tests whenever they are indicated.

The valve body contains precision parts and requires extreme care when parts are removed and serviced.
Place disassembled valve body parts in order for easier and proper assembly. Care will also prevent
springs and small parts from becoming scattered or lost.

Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.

Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings
and seals, or hold bearings and washers in place during assembly. Do not use grease.

Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.

Clean or replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer. Refer to
AT- 1 3 , "
A/T Fluid Cooler Cleaning" .

After overhaul, refill the transmission with new ATF.

When the A/T drain plug is removed, only some of the fluid is drained. Old A/T fluid will remain in torque
converter and ATF cooling system.
Always follow the procedures under “Changing A/T Fluid” in the AT section when changing A/T fluid. Refer
to AT-13, "
Changing A/T Fluid" , AT-13, "Checking A/T Fluid" .
SEF 2 89 H
SEF 2 17 U

A/T FLUID
AT-13
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A/T FLUIDPFP:KLE40
Changing A/T FluidECS00CDQ
Refer to MA-24, "Changing A/T Fluid" .
Checking A/T FluidECS0 0CD R
Refer to MA-22, "Checking A/T Fluid" .
A/T Fluid Cooler CleaningECS00CDS
Whenever an automatic transmission is repaired, overhauled, or replaced, the A/T fluid cooler mounted in the
radiator must be inspected and cleaned.
Metal debris and friction material, if present, can become trapped in the A/T fluid cooler. This debris can con-
taminate the newly serviced A/T or, in severe cases, can block or restrict the flow of A/T fluid. In either case,
malfunction of the newly serviced A/T may result.
Debris, if present, may build up as A/T fluid enters the cooler inlet. It will be necessary to back flush the cooler
through the cooler outlet in order to flush out any built up debris.
A/T FLUID COOLER CLEANING PROCEDURE
1. Position an oil pan under the automatic transmission's inlet and outlet cooler hoses.
2. Identify the inlet and outlet fluid cooler hoses.
3. Disconnect the fluid cooler inlet and outlet rubber hoses from the
steel cooler tubes or bypass valve.
NOTE:
Replace the cooler hoses if rubber material from the hose
remains on the tube fitting.
4. Allow any A/T fluid that remains in the cooler hoses to drain into
the oil pan.
5. Insert the extension adapter hose of a can of Transmission
Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-
let hose.
CAUTION:

Wear safety glasses and rubber gloves when spraying
the Transmission Cooler Cleaner.

Spray cooler cleaner only with adequate ventilation.

Avoid contact with eyes and skin.

Do not breath vapors or spray mist.
6. Hold the hose and can as high as possible and spray Transmis-
sion Cooler Cleaner in a continuous stream into the cooler outlet
hose until fluid flows out of the cooler inlet hose for 5 seconds.
7. Insert the tip of an air gun into the end of the cooler outlet hose.
8. Wrap a shop rag around the air gun tip and of the cooler outlet
hose.
SCIA3830E
SCIA3831E
SCIA3832E

A/T CONTROL SYSTEM
AT-29
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TCM FunctionECS00CDW
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 sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed signal
Stop lamp switch signal
Turbine revolution sensor
1st position switch signal
4th position switch signal
ATF pressure switch signal
Tow mode switch signalShift 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 systemInput 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
Sta rte r re lay
Back-up lamp relay
SCIA5624E

AT-46
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
4❏ Perform all road tests and enter checks in required inspection items.AT-5 3
4-1.Check before engine is started
AT-5 4
❏ AT-180, "A/T CHECK Indicator Lamp Does Not Come On" .
❏ Perform self-diagnostics Enter checks for detected items. AT- 8 5
❏ AT- 9 5 , "DTC U1000 CAN COMMUNICATION LINE"
❏ AT- 9 9 , "DTC P0615 START SIGNAL CIRCUIT"
❏ AT- 1 0 3 , "DTC P0700 TCM"
❏ AT- 1 0 4 , "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ AT- 1 0 8 , "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏ AT- 11 3 , "DTC P0725 ENGINE SPEED SIGNAL"
❏ AT- 11 5 , "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ AT- 11 7 , "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ AT- 11 9 , "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ AT- 1 2 1 , "DTC P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏ AT- 1 2 2 , "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏ AT- 1 2 3 , "DTC P1705 THROTTLE POSITION SENSOR"
❏ AT- 1 2 6 , "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏ AT- 1 3 1 , "DTC P1716 TURBINE REVOLUTION SENSOR"
❏ AT- 1 3 3 , "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏ AT- 1 3 5 , "DTC P1730 A/T INTERLOCK"
❏ AT- 1 3 8 , "DTC P1731 A/T 1ST ENGINE BRAKING"
❏ AT- 1 4 0 , "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏ AT- 1 4 2 , "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 4 4 , "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏ AT- 1 4 6 , "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 4 8 , "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏ AT- 1 5 0 , "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 5 2 , "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏ AT- 1 5 4 , "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
❏ AT- 1 5 6 , "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏ AT- 1 5 8 , "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 6 0 , "DTC P1841 ATF PRESSURE SWITCH 1"
❏ AT- 1 6 2 , "DTC P1843 ATF PRESSURE SWITCH 3"
❏ AT- 1 6 4 , "DTC P1845 ATF PRESSURE SWITCH 5"
❏ AT- 1 6 6 , "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.Idle inspection
AT-5 4
❏ AT-180, "Engine Cannot Be Started In “P” or “N” Position"
❏ AT-181, "In “P” Position, Vehicle Moves When Pushed"
❏ AT-182, "In “N” Position, Vehicle Moves"
❏ AT-183, "Large Shock (“N” to “D” Position)"
❏ AT-187, "Vehicle Does Not Creep Backward In “R” Position"
❏ AT-190, "Vehicle Does Not Creep Forward In “D” Position"
4-3.Driving tests
AT-5 5
Part 1
❏ AT-192, "
Vehicle Cannot Be Started From D1"
❏ AT-195, "A/T Does Not Shift: D1 → D2"
❏ AT-197, "A/T Does Not Shift: D2 → D3"
❏ AT-199, "A/T Does Not Shift: D3 → D4"
❏ AT-202, "A/T Does Not Shift: D4 → D5"
❏ AT-204, "A/T Does Not Perform Lock-up"
❏ AT-206, "A/T Does Not Hold Lock-up Condition"
❏ AT-208, "Lock-up Is Not Released"
❏ AT-209, "Engine Speed Does Not Return to Idle"

TROUBLE DIAGNOSIS
AT-47
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44-3Part 2
AT- 5 7
❏ AT-192, "Vehicle Cannot Be Started From D1"
❏ AT-195, "A/T Does Not Shift: D1 → D2"
❏ AT-197, "A/T Does Not Shift: D2 → D3"
❏ AT-199, "A/T Does Not Shift: D3 → D4"
Part 3
AT- 5 8
❏ AT-210, "A/T Does Not Shift: 5th gear → 4th gear"
❏ AT-213, "A/T Does Not Shift: 4th gear → 3rd gear"
❏ AT-214, "A/T Does Not Shift: 3rd gear → 2nd gear"
❏ AT-216, "A/T Does Not Shift: 2nd gear → 1st gear"
❏ AT-219, "Vehicle Does Not Decelerate By Engine Brake"
❏ Perform self-diagnostics Enter checks for detected items. AT- 8 5
❏ AT-95, "DTC U1000 CAN COMMUNICATION LINE"
❏ AT-99, "DTC P0615 START SIGNAL CIRCUIT"
❏ AT-103, "DTC P0700 TCM"
❏ AT-104, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ AT-108, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏ AT-113, "DTC P0725 ENGINE SPEED SIGNAL"
❏ AT-115, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ AT-117, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ AT-119, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ AT-121, "DTC P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏ AT-122, "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏ AT-123, "DTC P1705 THROTTLE POSITION SENSOR"
❏ AT-126, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏ AT-131, "DTC P1716 TURBINE REVOLUTION SENSOR"
❏ AT-133, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏ AT-135, "DTC P1730 A/T INTERLOCK"
❏ AT-138, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏ AT-140, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏ AT-142, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT-144, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏ AT-146, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏ AT-148, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏ AT-150, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT-152, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏ AT-154, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
❏ AT-156, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏ AT-158, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏ AT-160, "DTC P1841 ATF PRESSURE SWITCH 1"
❏ AT-162, "DTC P1843 ATF PRESSURE SWITCH 3"
❏ AT-164, "DTC P1845 ATF PRESSURE SWITCH 5"
❏ AT-166, "DTC P1846 ATF PRESSURE SWITCH 6"
5❏ Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunction
parts.
6❏ Perform all road tests and enter the checks again for the required items.AT- 5 3
7❏ For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunction parts.
See the chart for diagnostics by symptoms. (This chart also contains other symptoms and inspection proce-
dures.)AT- 6 0
8❏ Erase the results of the self-diagnostics from the TCM.AT- 3 8

DTC P1702 TRANSMISSION CONTROL MODULE (RAM)
AT-121
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DTC P1702 TRANSMISSION CONTROL MODULE (RAM)PFP:31036
DescriptionECS00CG5
The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The
TCM controls the A/T.
On Board Diagnosis LogicECS00CG6

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1702 TCM·RAM” with CONSULT-II is detected when TCM memory RAM is
malfunctioning.
Possible CauseECS00CG7
TCM.
DTC Confirmation ProcedureECS00CG8
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Run engine for at least 2 consecutive seconds at idle speed.
5. If DTC is detected, go to AT - 1 2 1 , "
Diagnostic Procedure" .
Diagnostic ProcedureECS00CG9
1. CHECK DTC
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
3. Touch “ERASE”.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Perform “DTC Confirmation Procedure”, AT-121, "
DTC Confir-
mation Procedure" .
Is the
“TCM·RAM” displayed again?
YES >> Replace the control valve with TCM. Refer to AT-231,
"Control Valve With TCM and A/T Fluid Temperature
Sensor 2" .
NO >>INSPECTION END
BCIA0030E
BCIA0031E