2007 INFINITI QX56 brake sensor

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
BRC-59
< SERVICE INFORMATION >[VDC/TCS/ABS]
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• After installation of the ABS actuator and electric unit (control unit), refill the brake system with new brake
fluid. Refer to MA-10
. Then bleed the air from the system. Refer to BR-8, "Bleeding Brake System" .
CAUTION:
• Never reuse drained brake fluid.
• Adjust the steering angle sensor. Refer to BRC-54, "
Adjustment of Steering Angle Sensor Neutral
Position" .
• Calibrate the yaw rate/side/decel G sensor. Refer to BRC-54, "
Calibration of Decel G Sensor" .

COMBINATION METERSDI-11
< SERVICE INFORMATION >
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Combination Meter Harness Connector Terminal LayoutINFOID:0000000003533484
Terminal and Reference Va lue for Combination MeterINFOID:0000000003533485
LKIA0698E
Te r m i n a l
No. Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
1 O Ignition switch ACC or ON ON — Battery voltage
8 Y/R Battery power supply OFF — Battery voltage
9 R/G Stop lamp switch ON Brake pedal depressed Battery voltage
Brake pedal released 0
10 P/B Brake fluid level switch ON Brake fluid level low 0
Brake fluid level normal Battery voltage
11 L C A N - H — — —
12 P CAN-L — — —
14 P/L Seat belt buckle switch
RH ONUnfastened (ON) 0
Fastened (OFF) Battery voltage
15 Y/L Fuel level sensor signal — — Refer to
DI-18, "
Fuel Level Sensor
Unit Inspection".
16 B/P Fuel level sensor and oil
pressure sensor ground ON — 0V
17 B Ground — — 0V
18 BR Illumination control switch — Lighting switch ON Refer to
LT- 1 2 0 , "
System Descrip-
tion".
23 G Parking Brake switch ON Parking brake applied 0
Parking brake released Battery voltage
24 O/L Ignition switch ON or
START ON — Battery voltage
27 O/B Seat belt buckle pre-ten-
sioner assembly LH (seat
belt buckle switch) ON
Unfastened (ON) 0
Fastened (OFF) Battery voltage
28 G/O Security indicator input OFF Security indicator ON 0
Security indicator
OFF Battery voltage
29 W/R Vehicle speed signal
(8-pulse) ONSpeedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)]
PKIA1935E

REAR SONAR SYSTEM
DI-51
< SERVICE INFORMATION >
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How to Proceed with Trouble DiagnosisINFOID:0000000003533529
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to DI-46, "
System Description".
3. Perform pre-diagnosis inspection. Refer to DI-51, "
Pre-diagnosis Inspection".
4. Perform self-diagnosis. Refer to DI-51, "
Self-Diagnosis Function".
5. Perform the preliminary check. Refer to DI-53, "
Preliminary Check".
6. Check symptom and repair or replace the cause of malfunction. Refer to DI-54, "
Symptom Chart".
7. Does the rear sonar system operate properly? If so, go to 8. If not, go to 3.
8. Clear fault codes. Refer to DI-51, "
Self-Diagnosis Function".
9. Inspection End.
Pre-diagnosis InspectionINFOID:0000000003533530
SENSOR STATUS CHECK
• Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor
mounting area.
• Check that snow, mud, or other foreign objects are not adhering to the rear sonar sensor.
• Check that there is no deformation, scratches, or other damage to the rear sonar sensor.
• Check that water has not accumulated in the rear sonar sensor.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensor.
1. Check that there are no obstacles within each rear sonar sensor's detection range.
2. Check that there are no nearby ultrasound sources (such as the sounds of vehicle horns, motorcycle
engines, or truck air brakes).
3. Check that the vehicle is on a level surface.
Self-Diagnosis FunctionINFOID:0000000003533531
There are four modes of self-diagnosis; entering diagnostics, requesting number of fault codes, requesting
fault codes, and idling or clearing fault codes. These steps must be followed in order. Self-diagnosis can be
manually exited by turning the ignition switch OFF, or selecting reverse gear. Self-diagnosis will exit unless a
fault code request occurs before a message is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Turn ignition switch ON. Rear sonar system OFF switch indica-
tor lamp illuminates for three seconds and then turns off.
2. Immediately push rear sonar system OFF switch ten times
within five seconds.
3. The sonar buzzer will sound once and the rear sonar system
OFF indicator will flash once.
REQUESTING NUMBER OF FAULT CODES MODE
Detection range
Rear sonar sensors Approx. 1.8 m (5.9 ft.) maximum
LKIA0389E

EC-7
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DTC P1564 ICC STEERING SWITCH .............507
Component Description .........................................507
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
507
On Board Diagnosis Logic ....................................507
DTC Confirmation Procedure ................................507
Wiring Diagram .....................................................509
Diagnosis Procedure .............................................510
Component Inspection ..........................................512
DTC P1564 ASCD STEERING SWITCH .........513
Component Description .........................................513
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
513
On Board Diagnosis Logic ....................................513
DTC Confirmation Procedure ................................513
Wiring Diagram .....................................................515
Diagnosis Procedure .............................................516
Component Inspection ..........................................518
DTC P1568 ICC FUNCTION ............................519
On Board Diagnosis Logic ....................................519
DTC Confirmation Procedure ................................519
Diagnosis Procedure .............................................519
DTC P1572 ICC BRAKE SWITCH ...................520
Component Description .........................................520
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
520
On Board Diagnosis Logic ....................................520
DTC Confirmation Procedure ................................520
Wiring Diagram .....................................................522
Diagnosis Procedure .............................................523
Component Inspection ..........................................526
DTC P1572 ASCD BRAKE SWITCH ...............528
Component Description .........................................528
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
528
On Board Diagnosis Logic ....................................528
DTC Confirmation Procedure ................................528
Wiring Diagram .....................................................530
Diagnosis Procedure .............................................531
Component Inspection ..........................................534
DTC P1574 ICC VEHICLE SPEED SENSOR ..535
Component Description .........................................535
On Board Diagnosis Logic ....................................535
DTC Confirmation Procedure ................................535
Diagnosis Procedure .............................................536
DTC P1574 ASCD VEHICLE SPEED SEN-
SOR ..................................................................
537
Component Description .........................................537
On Board Diagnosis Logic ....................................537
DTC Confirmation Procedure ................................537
Diagnosis Procedure .............................................538
DTC P1805 BRAKE SWITCH ..........................539
Description ............................................................539
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
539
On Board Diagnosis Logic .....................................539
DTC Confirmation Procedure ................................539
Wiring Diagram ......................................................540
Diagnosis Procedure .............................................541
Component Inspection ...........................................542
DTC P2100, P2103 THROTTLE CONTROL
MOTOR RELAY ..............................................
543
Component Description .........................................543
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
543
On Board Diagnosis Logic .....................................543
DTC Confirmation Procedure ................................543
Wiring Diagram ......................................................545
Diagnosis Procedure .............................................546
DTC P2101 ELECTRIC THROTTLE CON-
TROL FUNCTION ...........................................
548
Description .............................................................548
On Board Diagnosis Logic .....................................548
DTC Confirmation Procedure ................................548
Wiring Diagram ......................................................549
Diagnosis Procedure .............................................550
Component Inspection ...........................................553
Removal and Installation .......................................553
DTC P2118 THROTTLE CONTROL MOTOR .554
Component Description .........................................554
On Board Diagnosis Logic .....................................554
DTC Confirmation Procedure ................................554
Wiring Diagram ......................................................555
Diagnosis Procedure .............................................556
Component Inspection ...........................................557
Removal and Installation .......................................557
DTC P2119 ELECTRIC THROTTLE CON-
TROL ACTUATOR ..........................................
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Component Description .........................................559
On Board Diagnosis Logic .....................................559
DTC Confirmation Procedure ................................559
Diagnosis Procedure .............................................560
DTC P2122, P2123 APP SENSOR .................561
Component Description .........................................561
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
561
On Board Diagnosis Logic .....................................561
DTC Confirmation Procedure ................................561
Wiring Diagram ......................................................563
Diagnosis Procedure .............................................564
Component Inspection ...........................................566
Removal and Installation .......................................566
DTC P2127, P2128 APP SENSOR .................567
Component Description .........................................567
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
567
On Board Diagnosis Logic .....................................567

EC-8
DTC Confirmation Procedure ................................567
Wiring Diagram ......................................................569
Diagnosis Procedure .............................................570
Component Inspection ...........................................572
Removal and Installation .......................................573
DTC P2135 TP SENSOR .................................574
Component Description .........................................574
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
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On Board Diagnosis Logic .....................................574
DTC Confirmation Procedure ................................574
Wiring Diagram ......................................................576
Diagnosis Procedure .............................................577
Component Inspection ...........................................579
Removal and Installation .......................................580
DTC P2138 APP SENSOR ..............................581
Component Description .........................................581
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
581
On Board Diagnosis Logic .....................................581
DTC Confirmation Procedure ................................582
Wiring Diagram ......................................................583
Diagnosis Procedure .............................................584
Component Inspection ...........................................587
Removal and Installation .......................................587
DTC P2A00, P2A03 A/F SENSOR 1 ...............588
Component Description .........................................588
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
588
On Board Diagnosis Logic .....................................588
DTC Confirmation Procedure ................................588
Wiring Diagram ......................................................590
Diagnosis Procedure .............................................593
Removal and Installation .......................................596
ASCD BRAKE SWITCH ..................................597
Component Description .........................................597
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
597
Wiring Diagram ......................................................598
Diagnosis Procedure .............................................599
Component Inspection ...........................................602
ASCD INDICATOR ..........................................603
Component Description .........................................603
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
603
Wiring Diagram ......................................................604
Diagnosis Procedure .............................................604
ELECTRICAL LOAD SIGNAL .........................606
Description .............................................................606
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
606
Diagnosis Procedure .............................................606
FUEL INJECTOR ..............................................608
Component Description ........................................608
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
608
Wiring Diagram .....................................................609
Diagnosis Procedure .............................................610
Component Inspection ..........................................612
Removal and Installation .......................................612
FUEL PUMP .....................................................613
Description ............................................................613
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
613
Wiring Diagram .....................................................614
Diagnosis Procedure .............................................615
Component Inspection ..........................................617
Removal and Installation .......................................618
ICC BRAKE SWITCH .......................................619
Component Description ........................................619
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
619
Wiring Diagram .....................................................620
Diagnosis Procedure .............................................621
Component Inspection ..........................................624
IGNITION SIGNAL ............................................626
Component Description ........................................626
Wiring Diagram .....................................................627
Diagnosis Procedure .............................................632
Component Inspection ..........................................635
Removal and Installation .......................................637
REFRIGERANT PRESSURE SENSOR ...........638
Component Description ........................................638
Wiring Diagram .....................................................639
Diagnosis Procedure .............................................640
Removal and Installation .......................................642
MIL AND DATA LINK CONNECTOR ...............643
Wiring Diagram .....................................................643
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
645
Fuel Pressure ........................................................645
Idle Speed and Ignition Timing .............................645
Calculated Load Value ..........................................645
Mass Air Flow Sensor ...........................................645
Intake Air Temperature Sensor .............................645
Engine Coolant Temperature Sensor ...................645
A/F Sensor 1 Heater .............................................645
Heated Oxygen sensor 2 Heater ..........................645
Crankshaft Position Sensor (POS) .......................646
Camshaft Position Sensor (PHASE) .....................646
Throttle Control Motor ...........................................646
Fuel Injector ..........................................................646
Fuel Pump .............................................................646

EC-12
< SERVICE INFORMATION >
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: The troubleshooting for this DTC needs CONSULT-II.
*5: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.
*6: 2WD models
*7: Models with ICC
Alphabetical IndexINFOID:0000000003531579
NOTE:
•If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-145
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P1568 1568
ICC COMMAND VALUE*7EC-519
P1572 1572 ASCD BRAKE SWEC-520 (Models with ICC)
EC-528
(Models with ASCD)
P1574 1574
ASCD VHL SPD SEN*
6EC-535 (Models with ICC)
EC-537
(Models with ASCD)
P1610 - P1615 1610 - 1615 NATS MALFUNCTIONBL-116
P1710 1710 ATF TEMP SEN/CIRCAT- 11 9
P1730 1730 A/T INTERLOCKAT- 1 2 6
P1752 1752 I/C SOLENOID/CIRCAT- 1 3 0
P1754 1754 I/C SOLENOID FNCTNAT- 1 3 2
P1757 1757 FR/B SOLENOID/CIRCAT- 1 3 4
P1759 1759 FR/B SOLENOID FNCTAT- 1 3 6
P1762 1762 D/C SOLENOID/CIRCAT- 1 3 8
P1764 1764 D/C SOLENOID FNCTNAT- 1 4 0
P1767 1767 HLR/C SOL/CIRCAT- 1 4 2
P1769 1769 HLR/C SOL FNCTNAT- 1 4 4
P1772 1772 LC/B SOLENOID/CIRCAT- 1 4 6
P1774 1774 LC/B SOLENOID FNCTAT- 1 4 8
P1805 1805 BRAKE SW/CIRCUITEC-539
P2100 2100 ETC MOT PWREC-543
P2101 2101 ETC FUNCTION/CIRCEC-548
P2103 2103 ETC MOT PWREC-543
P2118 2118 ETC MOTEC-554
P2119 2119 ETC ACTREC-559
P2122 2122 APP SEN 1/CIRCEC-561
P2123 2123 APP SEN 1/CIRCEC-561
P2127 2127 APP SEN 2/CIRCEC-567
P2128 2128 APP SEN 2/CIRCEC-567
P2135 2135 TP SENSOREC-574
P2138 2138 APP SENSOREC-581
P2A00 2A00 A/F SENSOR1 (B1)EC-588
P2A03 2A03 A/F SENSOR1 (B2)EC-588
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3

INDEX FOR DTC
EC-13
< SERVICE INFORMATION >
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•If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer to
EC-147
.
Items
(CONSULT-II screen terms)DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3
A/F SEN1 HTR (B1) P0031 0031EC-163
A/F SEN1 HTR (B1) P0032 0032EC-163
A/F SEN1 HTR (B2) P0051 0051EC-163
A/F SEN1 HTR (B2) P0052 0052EC-163
A/F SENSOR1 (B1) P0130 0130EC-225
A/F SENSOR1 (B1) P0131 0131EC-234
A/F SENSOR1 (B1) P0132 0132EC-242
A/F SENSOR1 (B1) P0133 0133EC-250
A/F SENSOR1 (B1) P2A00 2A00EC-588
A/F SENSOR1 (B2) P0150 0150EC-225
A/F SENSOR1 (B2) P0151 0151EC-234
A/F SENSOR1 (B2) P0152 0152EC-242
A/F SENSOR1 (B2) P0153 0153EC-250
A/F SENSOR1 (B2) P2A03 2A03EC-588
A/T INTERLOCK P1730 1730AT- 1 2 6
A/T TCC S/V FNCTN P0744 0744AT- 11 3
APP SEN 1/CIRC P2122 2122EC-561
APP SEN 1/CIRC P2123 2123EC-561
APP SEN 2/CIRC P2127 2127EC-567
APP SEN 2/CIRC P2128 2128EC-567
APP SENSOR P2138 2138EC-581
ASCD BRAKE SW P1572 1572EC-520 (Models with ICC)
EC-528
(Models with ASCD)
ASCD SW P1564 1564EC-507
(Models with ICC)
EC-513
(Models with ASCD)
ASCD VHL SPD SEN*
6P1574 1574EC-535 (Models with ICC)
EC-537
(Models with ASCD)
BAT CURRENT SENSOR P1550 1550EC-483
BAT CURRENT SENSOR P1551 1551EC-489
BAT CURRENT SENSOR P1552 1552EC-489
BAT CURRENT SENSOR P1553 1553EC-495
BAT CURRENT SENSOR P1554 1554EC-501
ATF TEMP SEN/CIRC P0710 0710AT- 11 9
BRAKE SW/CIRCUIT P1805 1805EC-539
CAN COMM CIRCUIT U1000
1000*4EC-145
CAN COMM CIRCUIT U1001
1001*4EC-145
CKP SEN/CIRCUIT P0335 0335EC-336
CLOSED LOOP-B1 P1148 1148EC-466
CLOSED LOOP-B2 P1168 1168EC-466
CMP SEN/CIRC-B1 P0340 0340EC-342
COLD START CONTROL P1421 1421EC-481

EC-30
< SERVICE INFORMATION >
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000003531591
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any
malfunction occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Selector lever is changed to N, P, R position
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
• VDC system is operated
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.
• Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.
RESUME OPERATION
Sensor Input signal to ECM ECM function Actuator
ASCD brake switch Brake pedal operation
ASCD vehicle speed controlElectric throttle control
actuator Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation
Park/neutral position (PNP) switch Gear position
Wheel sensor Vehicle speed*
TCM Powertrain revolution*