2007 INFINITI QX56 brake sensor

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-27
< SERVICE INFORMATION >[ICC]
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P Operation Procedure
1. Touch “DATA MONITOR” on "SELECT DIAG MODE" screen.
2. Touch “ECU INPUT SIGNALS”, “MAIN SIGNALS“, or “SELEC-
TION FROM MENU” on "SELECT MONITOR ITEM" screen.
Monitored Item
×: Applicable
BCIA0031E
WDIA0084E
Monitored Item [unit] MAIN SIGNALSECU IN-
PUT SIG-
NALSSELECTION
FROM MENUDescription
VHCL SPEED SE
[km/h] or [mph]×××Indicates vehicle speed calculated from
wheel speed sensor signal.
SET VHCL SPD
[km/h] or [mph]××Indicates set vehicle speed stored in ICC
unit.
THRTL OPENING
[%]×××Indicates throttle angle calculated from sig-
nal voltage of throttle position sensor.
ENGINE RPM
[rpm]××Indicates engine speed read by ICC unit via
CAN communication (ECM transmits engine
speed via CAN communication).
DISTANCE ADJ
[SHOR/MID/LONG]×××Indicates set distance stored in ICC unit.
WIPER SW
[OFF/LOW/HIGH]××Indicates wiper [OFF/LOW/HIGH] status.
MAIN SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
SET/COAST SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
CANCEL SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
RESUME/ACC SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
CRUISE OPE
[ON/OFF]××Indicates whether vehicle speed is being
controlled or not (ON means “controlling”).
BRAKE SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
ICC brake switch signal.

ACS-28
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACTIVE TEST
CAUTION:
Do not perform the active test while driving. Active test cannot be started while ICC system warning
indicator is illuminated.
Active Test
STOP LAMP SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
stop lamp switch signal.
RELEASE SW NO
[ON/OFF]
××Indicates [ON/OFF] status as judged from
release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.
RELEASE SW NC
[ON/OFF]
××Indicates [ON/OFF] status as judged from
release switch signal.
OFF when brake is depressed.
ON when brake is not depressed.
IDLE SW
[ON/OFF]
××Indicates [ON/OFF] status of idle switch
read by ICC unit via CAN communication
(ECM transmits ON/OFF status via CAN
communication).
GEAR
[1, 2, 3, 4, 5]××Indicates A/T gear position read by ICC unit
via CAN communication (TCM transmits
gear position via CAN communication).
BUZZER O/P
[ON/OFF] ×Indicates [ON/OFF] status of ICC warning
output.
ICC WARNING×NOTE:
This item is displayed but cannot be moni-
tored.
VHCL SPD AT
[km/h] or [mph]
×Indicates vehicle speed calculated from A/T
vehicle speed sensor by ICC unit via CAN
communication (TCM transmits A/T vehicle
speed sensor signal via CAN communica-
tion).
PRESS SENS
[bar]×××Indicates brake fluid pressure value calculat-
ed from signal voltage of pressure sensor.
PRESS SENS 2
[bar]××NOTE:
This item is displayed but cannot be moni-
tored.
D RANGE SW
[ON/OFF]
××Indicates [ON/OFF] status of “D” position
read by ICC unit via CAN communication
(TCM transmits ON/OFF condition of “D” po-
sition via CAN communication).
A/T OD OFF
[ON/OFF]×Indicates [ON/OFF] status of OD cancel out-
put under control.
NP RANGE SW
[ON/OFF]××Indicates PNP switch signal read by ICC unit
via CAN communication. (TCM transmits
PNP switch signal via CAN communication)
DISTANCE×NOTE:
This item is displayed but cannot be moni-
tored.
RELATIVE SPD×NOTE:
This item is displayed but cannot be moni-
tored.
STP LMP DRIVE
[ON/OFF]××Indicates [ON/OFF] status of brake hold re-
lay drive output. Monitored Item [unit] MAIN SIGNALSECU IN-
PUT SIG-
NALSSELECTION
FROM MENUDescription

ACS-34
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Trouble Code (DTC) ChartINFOID:0000000003533794
×:Applicable
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)
11 CONTROL UNIT×××ו ICC unit internal malfunctionACS-36,
"DTC 11
CON-
TROL
UNIT"
12 VDC CONTROL UNIT×××ו VDC malfunction
• Brake booster signal harness is
open or shortedACS-36,
"DTC 12
VDC
CON-
TROL
UNIT"
20 CAN COMM CIRCUIT×××ו ICC unit detected CAN communi-
cation malfunctionACS-37,
"DTC 20
CAN
COMM
CIR-
CUIT"
31 POWER SUPPLY CIR1×××ו ICC unit power supply voltage is
excessively low (less than 8V)ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
34 POWER SUPPLY CIR2×××ו ICC unit power supply voltage is
excessively high.ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
41 VHCL SPEED SE CIRC×××ו Wheel sensor malfunction
• ABS actuator and electric unit
(control unit) malfunction
• A/T vehicle speed sensor mal-
function
•TCM malfunctionACS-38,
"DTC 41
VHCL
SPEED
SE CIRC"
43 VDC/TCS/ABS CIRC×××ו VDC/TCS/ABS system malfunc-
tionACS-38,
"DTC 43
VDC/
TCS/ABS
CIRC"

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-35
< SERVICE INFORMATION >[ICC]
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45 BRAKE SW/ STOP L SW×××ו ICC brake switch or stop lamp
switch harness is open or shorted
• ICC brake switch or stop lamp
switch is stuck to OFF
• ICC brake switch or stop lamp
switch is stuck to ONACS-38,
"DTC 45
BRAKE
SW/
STOP L
SW"
46 OPERATION SW CIRC××ו ICC steering switch harness or
spiral cable is open or shorted
• ICC steering switch malfunctionACS-40,
"DTC 46
OPERA-
TION SW
CIRC"
74 LASER BEAM OFF CNTR×× ×• Laser beam of ICC sensor is off
the aiming pointACS-41,
"DTC 74
LASER
BEAM
OFF CN-
TR"
90 STOP LAMP RLY FIX×× ×• Normally open terminal of stop
lamp relay is stuckACS-41,
"DTC 90
STOP
LAMP
RLY FIX"
92 ECM CIRCUIT×××וECM malfunction
• Accelerator pedal position sensor
malfunction
• ICC unit malfunctionACS-45,
"DTC 92
ECM
CIR-
CUIT"
96 NP RANGE××ו Park/neutral position switch har-
ness is open or shorted
• Park/neutral position switch mal-
function
•TCM malfunctionACS-45, "DTC 96
NP
RANGE"
97 AT CIRCUIT××וTCM malfunctionACS-46, "DTC 97
AT CIR-
CUIT"
98 GEAR POSITION××וTCM malfunction
• A/T turbine revolution sensor mal-
function
• A/T vehicle speed sensor mal-
functionACS-46,
"DTC 98
GEAR
POSI-
TION"
102 LASER STAIN×× ×• ICC sensor body window has
contaminationACS-47, "DTC 102
LASER
STAIN"
103 LASER SENSOR FAIL×× ×• ICC sensor internal malfunctionACS-47,
"DTC 103
LASER
SEN-
SOR
FA I L"
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Veh ic le-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)

ACS-36
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITINFOID:0000000003533795
1.DIAGNOSTIC CHECK
Are any items other than “DTC 11 CONTROL UNIT” indicated on self-diagnosis display?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> Replace ICC unit. Refer to ACS-55
. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
DTC 12 VDC CONTROL UNITINFOID:0000000003533796
1.DIAGNOSIS CHECK
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test". Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2.CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors, and connect them
securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
OK >> Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed
terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
NG >> GO TO 3.
3.CHECK HARNESS BETWEEN ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
104 LASER AIMING INCMP×× ×• Laser beam aiming of ICC sensor
is not adjustedACS-48,
"DTC 104
LASER
AIMING
INCMP"
107 LASER COMM FAIL×× ×• CAN data received by ICC sensor
is strange (from ICC unit, combi-
nation meter or ECM)ACS-48,
"DTC 107
LASER
COMM
FA IL"
109 LASER HIGH TEMP×× ×• Temperature around ICC sensor
is excessively highACS-48,
"DTC 109
LASER
HIGH
TEMP"
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)

ACS-38
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors.
3. Check continuity between ICC unit harness connector B13 ter-
minals 19, 20, and connector B17 terminal 46 and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55 . Erase DTC and
perform ICC system running test. Refer to ACS-9, "
ICC
System Running Test" . Then perform self-diagnosis of
ICC system again.
NG >> • Repair ICC unit ground harness.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test" .
Then perform self-diagnosis of ICC system again.
DTC 41 VHCL SPEED SE CIRCINFOID:0000000003533799
1.PERFORM ICC UNIT SELF-DIAGNOSIS
Perform self-diagnosis. Is “DTC 43 VDC/TCS/ABS CIRC” or “DTC 20 CAN COMM CIRCUIT” indicated in self-
diagnosis item display?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test". Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2.CHECK A/T VEHICLE SPEED SENSOR
With CONSULT-II
With data monitor, check “VHCL SPD AT”.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> • Check TCM.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test" .
Then perform self-diagnosis of ICC system again.
DTC 43 VDC/TCS/ABS CIRCINFOID:0000000003533800
1.DIAGNOSIS CHECK 1
With CONSULT-II
Perform self-diagnosis. Is “CAN COMM CIRCUIT” indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test". Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2.DIAGNOSIS CHECK 2
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> Replace ICC unit. Refer to ACS-55
. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
DTC 45 BRAKE SW/STOP L SWINFOID:0000000003533801
1.CHECK CONNECTORS FOR ICC UNITContinuity should exist.
SKIA6650E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-41
< SERVICE INFORMATION >[ICC]
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NG >> • Repair harness between ECM and spiral cable.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
4.CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Disconnect remaining spiral cable connector.
2. Check continuity between spiral cable (A) (to vehicle) terminals
33, 34 and spiral cable (B) (to switch) terminals 14,15.
OK or NG
OK >> Replace ECM. Erase DTC and perform ICC system run-
ning test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
NG >> • Replace spiral cable. Refer to SRS-37, "
Removal and
Installation".
• Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
DTC 74 LASER BEAM OFF CNTRINFOID:0000000003533803
1.DIAGNOSTIC CHECK
1. Adjust laser beam aiming. Refer to ACS-12
. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test" .
2. Perform self-diagnosis of ICC system. Is DTC 74 LASER BEAM OFF CNTR indicated?
YES or NO
YES >> • Replace ICC sensor and adjust laser beam aiming. Refer to ACS-55, "ICC Sensor" .
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
NO >> Inspection end.
DTC 90 STOP LAMP RLY FIXINFOID:0000000003533804
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect and check ICC unit connector.
OK or NG
OK >> GO TO 2.
NG >> • Connector malfunction.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of system.
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
1. Connect ICC unit connector and turn ignition switch ON.
2. With data monitor, check that “STOP LAMP SW” and “BRAKE SW” operate normally.
OK or NG
OK >> GO TO 11.
NG >> • BRAKE SW: GO TO 3.
• STOP LAMP SW: GO TO 8.
3.CHECK AND ADJUST ICC BRAKE SWITCH
Check ICC brake switch for proper installation and adjust if necessary. Refer to BR-5
.
OK or NG
OK >> GO TO 4.
NG >> After adjustment, erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System
Running Test". Then perform self-diagnosis of ICC system again. 34 - 14, 33 - 15 Continuity should exist.
WKIA4572E

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