2007 INFINITI QX56 sensor

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-53
< SERVICE INFORMATION >[ICC]
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• Perform ICC system running test. Refer to ACS-9, "ICC System Running Test" . Then perform
self-diagnosis of ICC system again.
Symptom 8 the System Does Not Detect the Vehicle Ahead at AllINFOID:0000000003533822
1.VISUAL CHECK
1. With ignition switch turned ON (engine not started), check that all indicator lamps in ICC system display
are continuously lit. (Check for a missing segment in preceding vehicle detection display.)
OK or NG
OK >> GO TO 2.
NG >> Check combination meter. Refer to DI-15, "
How to Proceed with Trouble Diagnosis".
2. VISUAL CHECK
• Check ICC sensor body window for contamination and foreign materials.
OK or NG
OK >> If any contamination or foreign materials are found, remove them. Perform ICC system running
test. Refer to ACS-9, "
ICC System Running Test".
NG >> GO TO 3.
3.VISUAL CHECK
• Check ICC sensor body window for cracks and scratches.
OK or NG
OK >> GO TO 4.
NG >> • Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-55, "
ICC Sen-
sor".
• Perform ICC system running test. Refer to ACS-9, "
ICC System Running Test". Then perform
self-diagnosis of ICC system again.
4.ADJUST ICC SENSOR
• After performing laser beam aiming adjustment, perform ICC system running test. Refer to ACS-9, "
ICC Sys-
tem Running Test". Check that preceding vehicle detection performance has been improved.
OK or NG
OK >> Inspection End.
NG >> • Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-55, "
ICC Sen-
sor".
• Perform ICC system running test. Refer to ACS-9, "
ICC System Running Test". Then perform
self-diagnosis of ICC system again.

REMOVAL AND INSTALLATION
ACS-55
< SERVICE INFORMATION >[ICC]
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REMOVAL AND INSTALLATION
ICC UnitINFOID:0000000003533826
ICC SensorINFOID:0000000003533827
CAUTION:
Perform the laser beam aiming procedure every time the ICC sensor is removed or installed. Refer to
ACS-12
.
ICC Steering SwitchINFOID:0000000003533828
Replace ICC steering switch as switch kit assembly. Refer to AV-46, "Removal and Installation" .
1. Rear inner side panel LH (shown
with finisher removed)2. ICC unit harness connector 3. ICC unit
⇐Vehicle front
WKIA4607E
1. ICC sensor bracket 2. ICC frame bracket 3. ICC sensor
4. Frame side rail⇐Vehicle front
WKIA4608E

AT-2
DTC P0700 TCM ................................................98
Description ..............................................................98
On Board Diagnosis Logic ......................................98
Possible Cause .......................................................98
DTC Confirmation Procedure .................................98
Diagnosis Procedure ..............................................98
DTC P0705 PARK/NEUTRAL POSITION
SWITCH .............................................................
99
Description ..............................................................99
CONSULT-II Reference Value in Data Monitor
Mode .......................................................................
99
On Board Diagnosis Logic ......................................99
Possible Cause .......................................................99
DTC Confirmation Procedure .................................99
Wiring Diagram - AT - PNP/SW .............................100
Diagnosis Procedure .............................................100
DTC P0717 TURBINE REVOLUTION SEN-
SOR ..................................................................
103
Description .............................................................103
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
103
On Board Diagnosis Logic .....................................103
Possible Cause ......................................................103
DTC Confirmation Procedure ................................103
Diagnosis Procedure .............................................103
DTC P0720 VEHICLE SPEED SENSOR A/T
(REVOLUTION SENSOR) ...............................
105
Description .............................................................105
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
105
On Board Diagnosis Logic .....................................105
Possible Cause ......................................................105
DTC Confirmation Procedure ................................105
Wiring Diagram - AT - VSSA/T ..............................106
Diagnosis Procedure .............................................107
DTC P0725 ENGINE SPEED SIGNAL ............109
Description .............................................................109
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
109
On Board Diagnosis Logic .....................................109
Possible Cause ......................................................109
DTC Confirmation Procedure ................................109
Diagnosis Procedure .............................................109
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE ..........................................
111
Description .............................................................111
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
111
On Board Diagnosis Logic .....................................111
Possible Cause ......................................................111
DTC Confirmation Procedure ................................111
Diagnosis Procedure .............................................111
DTC P0744 A/T TCC S/V FUNCTION (LOCK-
UP) ...................................................................
113
Description ............................................................113
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
113
On Board Diagnosis Logic ....................................113
Possible Cause .....................................................113
DTC Confirmation Procedure ................................113
Diagnosis Procedure .............................................114
DTC P0745 LINE PRESSURE SOLENOID
VALVE ..............................................................
115
Description ............................................................115
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
115
On Board Diagnosis Logic ....................................115
Possible Cause .....................................................115
DTC Confirmation Procedure ................................115
Diagnosis Procedure .............................................115
DTC P1705 THROTTLE POSITION SENSOR ..117
Description ............................................................117
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
117
On Board Diagnosis Logic ....................................117
Possible Cause .....................................................117
DTC Confirmation Procedure ................................117
Diagnosis Procedure .............................................117
DTC P1710 A/T FLUID TEMPERATURE SEN-
SOR CIRCUIT ...................................................
119
Description ............................................................119
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
119
On Board Diagnosis Logic ....................................119
Possible Cause .....................................................119
DTC Confirmation Procedure ................................119
Wiring Diagram - AT - FTS ...................................120
Diagnosis Procedure .............................................120
Component Inspection ..........................................122
DTC P1721 VEHICLE SPEED SENSOR MTR ..124
Description ............................................................124
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
124
On Board Diagnosis Logic ....................................124
Possible Cause .....................................................124
DTC Confirmation Procedure ................................124
Diagnosis Procedure .............................................124
DTC P1730 A/T INTERLOCK ...........................126
Description ............................................................126
On Board Diagnosis Logic ....................................126
Possible Cause .....................................................126
DTC Confirmation Procedure ................................126
Judgement of A/T Interlock ...................................126
Diagnosis Procedure .............................................127
DTC P1731 A/T 1ST ENGINE BRAKING ........128
Description ............................................................128
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
128

AT-4
DTC Confirmation Procedure ................................152
Diagnosis Procedure .............................................152
DTC P1845 ATF PRESSURE SWITCH 5 ........154
Description .............................................................154
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
154
On Board Diagnosis Logic .....................................154
Possible Cause ......................................................154
DTC Confirmation Procedure ................................154
Diagnosis Procedure .............................................154
DTC P1846 ATF PRESSURE SWITCH 6 ........156
Description .............................................................156
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
156
On Board Diagnosis Logic .....................................156
Possible Cause ......................................................156
DTC Confirmation Procedure ................................156
Diagnosis Procedure .............................................156
MAIN POWER SUPPLY AND GROUND CIR-
CUIT .................................................................
158
Wiring Diagram - AT - MAIN ..................................158
Diagnosis Procedure .............................................159
CLOSED THROTTLE POSITION AND WIDE
OPEN THROTTLE POSITION CIRCUIT .........
161
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
161
Diagnosis Procedure .............................................161
BRAKE SIGNAL CIRCUIT ..............................162
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
162
Diagnosis Procedure .............................................162
TOW MODE SWITCH ......................................163
Description .............................................................163
Wiring Diagram - AT - TMSW ................................163
Diagnosis Procedure .............................................164
TROUBLE DIAGNOSIS FOR SYMPTOMS .....165
Wiring Diagram - AT - NONDTC ............................165
A/T Check Indicator Lamp Does Not Come On .....167
Engine Cannot Be Started in "P" or "N" Position ...168
In "P" Position, Vehicle Moves When Pushed .......168
In "N" Position, Vehicle Moves ..............................169
Large Shock ("N" to "D" Position) ..........................170
Vehicle Does Not Creep Backward in "R" Position ..172
Vehicle Does Not Creep Forward in "D" Position ..175
Vehicle Cannot Be Started from D1 .......................177
A/T Does Not Shift: D1→ D2 ..................................179
A/T Does Not Shift: D2→ D3 ..................................181
A/T Does Not Shift: D3→ D4 ..................................183
A/T Does Not Shift: D4→ D5 ..................................185
A/T Does Not Perform Lock-up .............................187
A/T Does Not Hold Lock-up Condition ...................189
Lock-up Is Not Released .......................................190
Engine Speed Does Not Return to Idle .................191
A/T Does Not Shift: 5th gear → 4th gear ..............192
A/T Does Not Shift: 4th gear → 3rd gear ..............194
A/T Does Not Shift: 3rd gear → 2nd gear .............196
A/T Does Not Shift: 2nd gear → 1st gear .............197
Vehicle Does Not Decelerate By Engine Brake ....199
A/T SHIFT LOCK SYSTEM ..............................202
Description ............................................................202
Shift Lock System Electrical Parts Location ..........202
Wiring Diagram - AT - SHIFT ................................203
Shift Lock Control Unit Reference Value ..............204
Component Inspection ..........................................204
SHIFT CONTROL SYSTEM .............................207
Control Device Removal and Installation ..............207
Adjustment of A/T Position ....................................208
Checking of A/T Position .......................................208
ON-VEHICLE SERVICE ...................................209
Oil Pan ..................................................................209
Control Valve with TCM and A/T Fluid Tempera-
ture Sensor 2 ........................................................
210
Rear Oil Seal .........................................................219
AIR BREATHER HOSE ....................................221
Removal and Installation .......................................221
TRANSMISSION ASSEMBLY ..........................223
Removal and Installation (2WD) ...........................223
Removal and Installation (4WD) ...........................225
OVERHAUL ......................................................228
Component ...........................................................228
Oil Channel ...........................................................235
Location of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ..........................
237
DISASSEMBLY ................................................240
Disassembly ..........................................................240
REPAIR FOR COMPONENT PARTS ..............258
Oil Pump ...............................................................258
Front Sun Gear, 3rd One-Way Clutch ...................260
Front Carrier, Input Clutch, Rear Internal Gear .....262
Mid Sun Gear, Rear Sun Gear, High and Low Re-
verse Clutch Hub ..................................................
267
High and Low Reverse Clutch ..............................272
Direct Clutch .........................................................274
ASSEMBLY ......................................................277
Assembly (1) .........................................................277
Adjustment ............................................................290
Assembly (2) .........................................................292
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
298
General Specification ............................................298
Vehicle Speed When Shifting Gears .....................298
Vehicle Speed When Performing and Releasing
Complete Lock-up .................................................
299
Stall Speed ............................................................299

AT-5
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P N Line Pressure ........................................................
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A/T Fluid Temperature Sensor ..............................299
Turbine Revolution Sensor ....................................299
Vehicle Speed Sensor A/T (Revolution Sensor) ....299
Reverse brake .......................................................300
Total End Play .......................................................300

AT-8
< SERVICE INFORMATION >
PRECAUTIONS
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003532218
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.
WARNING:
• 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 performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
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 har-
ness connectors.
Precaution for On Board Diagnosis (OBD) System of A/T and EngineINFOID:0000000003532219
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.
PrecautionINFOID:0000000003532220
•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”.
SEF289H

A/T CONTROL SYSTEM
AT-31
< SERVICE INFORMATION >
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TCM FunctionINFOID:0000000003532230
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.
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
SCIA1519E

AT-32
< SERVICE INFORMATION >
A/T CONTROL SYSTEM
CONTROL SYSTEM DIAGRAM
CAN CommunicationINFOID:0000000003532231
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-4,
"CAN Communication System".
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 sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
SCIA5624E