2005 INFINITI QX4 check engine

AT-3
D
E
F
G
H
I
J
K
L
MA
B
AT
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

A/T CONTROL SYSTEM
AT-29
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
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

ON BOARD DIAGNOSTIC (OBD) SYSTEM
AT-37
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionECS00CE4
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in
the ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the A/T CHECK indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail,
refer to AT- 8 5 , "
SELF-DIAGNOSTIC RESULT MODE" .
OBD-II Function for A/T SystemECS00CE5
The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system. One function
is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to A/T system parts.
One or Two Trip Detection Logic of OBD-IIECS00CE6
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.
TWO TRIP DETECTION LOGIC
When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL will not illuminate. — 1st Trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd Trip
The “Trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
OBD-II Diagnostic Trouble Code (DTC)ECS00CE7
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)

1st trip DTC No. is the same as DTC No.

Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-
ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring
or occurred in the past and returned to normal.
CONSULT-II can identify them as shown below, therefore, CONSULT-II (if available) is recom-
mended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
BCIA0030E

AT-40
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: October 20052005 QX56
Malfunction Indicator Lamp (MIL)ECS00CE8
DESCRIPTION
The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned “ON” with-
out the engine running. This is a bulb check.

If the MIL does not light up, refer to DI-30, "WARNING LAMPS" .
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.
SEF 2 17 U

TROUBLE DIAGNOSIS
AT-43
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
How To Perform Trouble Diagnosis For Quick and Accurate RepairECS00CEB
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelerator pedal position sensor (throttle position
sensor) or PNP switch and provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a error that occurs intermittently
rather than continuously. Most intermittent errors are caused by poor
electric connections or improper wiring. In this case, careful check-
ing of suspected circuits may help prevent the replacement of good
parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the AT-44, "
WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” as shown on
the example (Refer to AT- 4 5
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT6 3 1IB
SAT6 3 2I
SEF 2 34 G

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
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
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