brake sensor INFINITI QX56 2011 Factory User Guide

BRC-1
BRAKES
C
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G H
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SECTION BRC
A
B
BRC
N
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CONTENTS
BRAKE CONTROL SYSTEM
WITH VDC
PRECAUTION ................ ...............................
5
PRECAUTIONS .............................................. .....5
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
5
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
5
Precaution for Procedure without Cowl Top Cover ......6
Precaution for Brake System ....................................6
Precaution for Brake Control System ........................6
Precaution for Harness Repair ..................................7
PREPARATION ............................................9
PREPARATION .............................................. .....9
Commercial Service Tools .................................. ......9
SYSTEM DESCRIPTION .............................10
COMPONENT PARTS ................................... ....10
Component Parts Location .................................. ....10
Component Description ...........................................13
ABS Actuator and Electric Unit (Control Unit) .........14
Wheel Sensor and Sensor Rotor ............................14
Stop Lamp Switch ...................................................15
Steering Angle Sensor ............................................15
Yaw Rate/Side/Decel G sensor ...............................15
Brake Fluid Level Switch .........................................15
Parking Brake Switch ..............................................15
VDC OFF Switch .....................................................15
SYSTEM .............................................................16
System Description ............................................. ....16
Fail-safe ..................................................................25
Protection Function .................................................28
VDC FUNCTION .................................................... ....28
VDC FUNCTION : System Description ...................28
TCS FUNCTION ..................................................... ....31
TCS FUNCTION : System Description ....................31
ABS FUNCTION .................................................... ....32
ABS FUNCTION : System Description ....................33
EBD FUNCTION .................................................... ....34
EBD FUNCTION : System Description ....................34
HILL START ASSIST FUNCTION ......................... ....36
hill start assist FUNCTION : System Description ....36
BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION ............................................................. ....
37
BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION : System Description ............................
37
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
40
CONSULT-III Function ............................................40
ECU DIAGNOSIS INFORMATION ..............45
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .............................................
45
Reference Value .................................................. ....45
Fail-safe ...................................................................47
Protection Function ..................................................50
DTC Inspection Priority Chart ..................................50
DTC Index ...............................................................51
WIRING DIAGRAM ......................................53
BRAKE CONTROL SYSTEM ...........................53
Wiring Diagram .................................................... ....53
BASIC INSPECTION ...................................60
DIAGNOSIS AND REPAIR WORK FLOW .......60
Work Flow ............................................................ ....60
Diagnostic Work Sheet ............................................61
Revision: 2010 May2011 QX56

BRC-2
ADDITIONAL SERVICE WHEN REPLACING
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) ..............................................
63
Description ........................................................... ...63
ADJUSTMENT OF STEERING ANGLE SEN-
SOR NEUTRAL POSITION ...............................
64
Description ........................................................... ...64
Work Procedure ......................................................64
CALIBRATION OF DECEL G SENSOR ...........66
Description ........................................................... ...66
Work Procedure ......................................................66
DTC/CIRCUIT DIAGNOSIS ...................... ...68
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR ................................................................. ...
68
DTC Logic ............................................................ ...68
Diagnosis Procedure ..............................................68
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR ....................................................................
70
DTC Logic ............................................................ ...70
Diagnosis Procedure ..............................................70
C1109 POWER AND GROUND SYSTEM .........72
Description ........................................................... ...72
DTC Logic ...............................................................72
Diagnosis Procedure ..............................................72
C1111 PUMP MOTOR .......................................75
DTC Logic ............................................................ ...75
Diagnosis Procedure ..............................................75
C1115 WHEEL SENSOR ...................................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ..............................................77
C1116 STOP LAMP SWITCH ............................79
DTC Logic ............................................................ ...79
Diagnosis Procedure ..............................................79
Component Inspection (Stop lamp Switch) ............85
Component Inspection (Stop Lamp Relay) .............86
C1118 TRANSFER CONTROL UNIT ................87
DTC Logic ............................................................ ...87
Diagnosis Procedure ..............................................87
C1120, C1122, C1124, C1126 ABS IN VALVE
SYSTEM .......................................................... ...
88
DTC Logic ............................................................ ...88
Diagnosis Procedure ..............................................88
C1121, C1123, C1125, C1127 ABS OUT
VALVE SYSTEM ................................................
90
DTC Logic ............................................................ ...90
Diagnosis Procedure ..............................................90
C1130 ENGINE SIGNAL ...................................92
DTC Logic ............................................................ ...92
Diagnosis Procedure ............................................ ...92
C1140 ACTUATOR RELAY SYSTEM ..............93
DTC Logic ............................................................ ...93
Diagnosis Procedure ...............................................93
C1142 PRESS SENSOR ...................................95
DTC Logic ............................................................ ...95
Diagnosis Procedure ...............................................95
C1143 STEERING ANGLE SENSOR ...............97
DTC Logic ............................................................ ...97
Diagnosis Procedure ...............................................97
C1144 INCOMPLETE STEERING ANGLE
SENSOR ADJUSTMENT ..................................
99
DTC Logic ............................................................ ...99
Diagnosis Procedure ...............................................99
C1145, C1146 YAW RATE/SIDE/DECEL G
SENSOR ...........................................................
100
DTC Logic ............................................................ .100
Diagnosis Procedure .............................................100
C1155 BRAKE FLUID LEVEL SWITCH ..........103
DTC Logic ............................................................ .103
Diagnosis Procedure .............................................103
Component Inspection ..........................................104
C1160 DECEL G SEN SET ..............................105
DTC Logic ............................................................ .105
Diagnosis Procedure .............................................105
C1164, C1165 CV SYSTEM .............................106
DTC Logic ............................................................ .106
Diagnosis Procedure .............................................106
C1166, C1167 SV SYSTEM .............................108
DTC Logic ............................................................ .108
Diagnosis Procedure .............................................108
C1170 VARIANT CODING ...............................110
DTC Logic ............................................................ .110
Diagnosis Procedure .............................................110
C118E ACCUMULATOR ..................................111
DTC Logic ............................................................ .111
Diagnosis Procedure .............................................111
U1000 CAN COMM CIRCUIT ...........................112
Description ........................................................... .112
DTC Logic .............................................................112
Diagnosis Procedure .............................................112
POWER SUPPLY AND GROUND CIRCUIT ....113
Description ........................................................... .113
Diagnosis Procedure .............................................113
PARKING BRAKE SWITCH .............................117
Component Function Check ................................ .117
Diagnosis Procedure .............................................117
Component Inspection ..........................................118
Revision: 2010 May2011 QX56

BRC-3
C
DE
G H
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M A
B
BRC
N
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VDC OFF SWITCH ......................................... ..119
Component Function Check ................................ ..119
Diagnosis Procedure .............................................119
Component Inspection ..........................................120
ABS WARNING LAMP ................................... ..122
Component Function Check ................................ ..122
Diagnosis Procedure .............................................122
BRAKE WARNING LAMP ...............................123
Component Function Check ................................ ..123
Diagnosis Procedure .............................................123
VDC WARNING LAMP .....................................125
Component Function Check ................................ ..125
Diagnosis Procedure .............................................125
VDC OFF INDICATOR LAMP ..........................126
Component Function Check ................................ ..126
Diagnosis Procedure .............................................126
SYMPTOM DIAGNOSIS ............................127
EXCESSIVE OPERATION FREQUENCY ...... ..127
Description .......................................................... ..127
Diagnosis Procedure .............................................127
UNEXPECTED BRAKE PEDAL REACTION ...128
Description .......................................................... ..128
Diagnosis Procedure .............................................128
THE BRAKING DISTANCE IS LONG ..............129
Description .......................................................... ..129
Diagnosis Procedure .............................................129
DOES NOT OPERATE .....................................130
Description .......................................................... ..130
Diagnosis Procedure .............................................130
BRAKE PEDAL VIBRATION OR OPERA-
TION SOUND OCCURS ...................................
131
Description .......................................................... ..131
Diagnosis Procedure .............................................131
VEHICLE JERKS DURING ..............................132
Description .......................................................... ..132
Diagnosis Procedure .............................................132
NORMAL OPERATING CONDITION ...............133
Description .......................................................... ..133
REMOVAL AND INSTALLATION .............134
WHEEL SENSOR ........................................... ..134
FRONT WHEEL SENSOR ..................................... ..134
FRONT WHEEL SENSOR : Exploded View .........134
FRONT WHEEL SENSOR : Removal and Instal-
lation ......................................................................
134
REAR WHEEL SENSOR ....................................... ..135
REAR WHEEL SENSOR : Exploded View ...........135
REAR WHEEL SENSOR : Removal and Installa-
tion ....................................................................... ..
135
SENSOR ROTOR ............................................136
FRONT SENSOR ROTOR ..................................... ..136
FRONT SENSOR ROTOR : Removal and Instal-
lation ......................................................................
136
REAR SENSOR ROTOR ....................................... ..136
REAR SENSOR ROTOR : Removal and Installa-
tion .........................................................................
136
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) ...........................................
137
Removal and Installation .......................................137
YAW RATE/SIDE/DECEL G SENSOR ...........138
Exploded View .......................................................138
Removal and Installation .......................................138
STEERING ANGLE SENSOR .........................139
Removal and Installation .......................................139
VDC OFF SWITCH ..........................................140
Removal and Installation .......................................140
BRAKE ASSIST (WITH PREVIEW FUNC-
TION)
PRECAUTION ............... .............................
141
PRECAUTIONS ...............................................141
Precautions for Preview Function Service ........... ..141
SYSTEM DESCRIPTION ...........................142
COMPONENT PARTS ....................................142
Component Parts Location .................................. ..142
Component Description .........................................143
SYSTEM ..........................................................145
BRAKE ASSIST (WITH PREVIEW FUNCTION) ... ..145
BRAKE ASSIST (WITH PREVIEW FUNCTION) :
System Description ................................................
145
DTC/CIRCUIT DIAGNOSIS .......................146
BRAKE ASSIST (WITH PREVIEW FUNC-
TION) ...............................................................
146
Diagnosis Procedure ........................................... ..146
SYMPTOM DIAGNOSIS ............................147
NORMAL OPERATING CONDITION .............147
Description ........................................................... ..147
INTELLIGENT BRAKE ASSIST
PRECAUTION ............... .............................
148
PRECAUTIONS ...............................................148
Precautions for IBA System Service .................... ..148
Revision: 2010 May2011 QX56

PRECAUTIONSBRC-7
< PRECAUTION > [WITH VDC]
C
D
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G H
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M A
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BRC
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and tires installed on the vehicle are the specified si ze and parts. Brake performance and controllability may
be negatively affected when other parts than the specified are installed.
 Brake stopping distance may become longer and steering stability may be negatively affected, when tires in
different size and combination or other parts than the specified are used.
 When a radio (including wiring), antenna and antenna lead line are located near ABS actuator and electric
unit (control unit), a malfunction or improper operation ma y occur for the control of VDC function, TCS func-
tion, ABS function, EBD function, hill start assist func tion or brake limited slip differential (BLSD) function.
 When the following items are replaced by other parts than genuine parts or modified, ABS warning lamp, brake warning lamp and VDC warning lamp may turn ON, and the control may not operate normally for VDC
function, TCS function, ABS function, EB D function, hill start assist function or brake limited slip differential
(BLSD) function.
- Suspension component parts (shock absorber, spring, bushing and others)
- Tire and wheel (other than the specified size)
- Brake component parts (brake pad, disc rotor, brake caliper and others)
- Engine component parts (ECM, muffler and others)
- Body reinforcement component parts (rollover bar, tower bar and others)
 When suspension, tire and brake component parts are excessively worn or deteriorated and the vehicle is
driven, ABS warning lamp, brake warning lamp and VDC warning lamp may tu\
rn ON, and the control may
not operate normally for VDC function, TCS function, ABS function, EBD function, hill start assist function or
brake limited slip differential (BLSD) function.
 ABS warning lamp, brake warning lamp and VDC warning lamp may turn ON, when only front wheel or rear wheel is rotated using a free roller. This is not a ma lfunction, because it is caused by wheel speed difference
between wheel that is rotated and wheel that is not rota ted. In this case, perform self-diagnosis, check self-
diagnosis results, and erase memory.
 When power supply voltage is not normal, ABS warning lamp, brake warning lamp and VDC warning lamp
turn ON. ABS actuator and electric unit (control unit) st ops control for VDC function, TCS function, ABS func-
tion, EBD function, hill start assist function or brake limited slip differential (BLSD) function. Ordinary brake
operates. After power supply returns to normal, ABS warning lamp, brake warning lamp and VDC warning
lamp turn OFF. The control becomes operative for VD C function, TCS function, ABS function, EBD function,
hill start assist function or brake li mited slip differential (BLSD) function.
 VDC warning lamp may turn ON and VDC function or TCS function may not normally operate, when driving
on a special road the is extremely slanted (bank in a circ uit course). This is not a malfunction if the status
returns to normal for VDC function or TCS function after the engine is started again. In this case, perform
self-diagnosis, check self-diagnosis results, and erase memory.
 A malfunction in yaw rate/side/decel G sensor syste m may be detected when the vehicle sharply turns dur-
ing a spin turn, acceleration turn or drift driving while VDC function or TCS function are OFF (VDC OFF
switch is pressed and VDC OFF indicator lamp is in ON st atus). This is not a malfunction if the status returns
to normal for VDC function or TCS function after the engine is started again. In this case, perform self-diag-
nosis, check self-diagnosis results, and erase memory
Precaution for Harness RepairINFOID:0000000006222558
 Solder the repair part, and wrap it with tape. [Twisted wire fray must be 110 mm (4.33 in) or less.]
SKIB8766E
Revision: 2010 May2011 QX56

COMPONENT PARTSBRC-11
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
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K L
M A
B
BRC
N
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4WD
1. ECM Refer to EC-16, "
Component Parts
Location". 2. Control valve & TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion". 3. Front wheel sensor
4. ABS actuator and electric unit (con- trol unit) 5. Stop lamp switch 6. Steering angle sensor
7. VDC OFF switch 8. Yaw rate/side/decel G sensor 9. Rear wheel sensor
A. Front wheel hub and bearing assem- bly B. Inside engine room C. Brake pedal
D. ABS warning lamp, brake warning lamp, VDC warning lamp, VDC OFF
indicator lamp E. Back of spiral cable assembly F. Center console assembly
G. Under center console assembly H. Rear wheel hub and bearing assem- bly
Revision: 2010 May2011 QX56

BRC-12
< SYSTEM DESCRIPTION >[WITH VDC]
COMPONENT PARTS
1. Transfer control unit
Refer to DLN-10, "
Component Parts
Location". 2. ECM
Refer to EC-16, "
Component Parts
Location". 3. Control valve & TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Component Parts Loca-
tion".
4. Front wheel sensor 5. ABS actuat or and electric unit (con-
trol unit) 6. Stop lamp switch
7. Steering angle sensor 8. VDC OFF switch 9. Yaw rate/side/decel G sensor
10. Rear wheel sensor
A. Front wheel hub and bearing assem- bly B. Inside engine room C. Brake pedal
JPFIC0186ZZ
Revision: 2010 May2011 QX56

COMPONENT PARTSBRC-13
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Component DescriptionINFOID:0000000006222560
*1: Models with Advanced Driver Assistance System
*2: Models with 4WD system
D. ABS warning lamp, brake warning lamp, VDC warning lamp, VDC OFF
indicator lamp E. Back of spiral cable assembly F. Center console assembly
G. Under center console assembly H. Rear wheel hub and bearing assem- bly
Component Reference/Function
ABS actuator and electric unit
(control unit) Motor/accumulator assembly
BRC-14, "
ABS Actuator and Electric Unit (Control Unit)"
Motor relay
Actuator relay (main relay)
ABS IN valve
ABS OUT valve
Cut valve 1
Cut valve 2
Suction valve 1
Suction valve 2
Control pressure sensor
*1
Accumulator pressure sensor
Master cylinder pressure sensor
Wheel sensor BRC-14, "
Wheel Sensor and Sensor Rotor"
Stop lamp switchBRC-15, "Stop Lamp Switch"
Steering angle sensorBRC-15, "Steering Angle Sensor"
Yaw rate/side/decel G sensorBRC-15, "Yaw Rate/Side/Decel G sensor"
Brake fluid level switch BRC-15, "Brake Fluid Level Switch"
Parking brake switchBRC-15, "Parking Brake Switch"
VDC OFF switchBRC-15, "VDC OFF Switch"
ECMMainly transmits the
following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
 Accelerator pedal position signal
 Engine speed signal
Mainly receives the following signals from ABS actuator and
electric unit (control unit) via CAN communication.
 Target throttle position signal
TCM Mainly transmits the
following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
 Shift position signal
 Current gear position signal
Transfer control unit
*2Mainly transmits the following signals to ABS actuator and elec-
tric unit (control unit) via CAN communication.
 Current 4WD mode signal
ABS warning lamp
BRC-16, "
System Description"Brake warning lamp
VDC warning lamp
VDC OFF indicator lamp
Revision: 2010 May2011 QX56

BRC-14
< SYSTEM DESCRIPTION >[WITH VDC]
COMPONENT PARTS
ABS Actuator and Electric Unit (Control Unit)
INFOID:0000000006222561
Electric unit (control unit) is in tegrated with actuator and motor/accumulator assembly and comprehensively
controls VDC function, TCS function, AB S function, EBD function, hill start assist function or brake limited slip
differential function.
ELECTRIC UNIT (CONTROL UNIT)
 Brake fluid pressure, engine and transmission are controlled according to signals from each sensor.
 If malfunction is detected, the system enters fail-safe mode.
ACTUATOR
The following components are integrated with ABS actuator.
Motor/accumulator Assembly
Pump Operates the pump drive according to signals from ABS actuator and electric unit (control unit) by the motor.
Motor Operates the motor drive according to signals fr om ABS actuator and electric unit (control unit).
Accumulator
 The accumulator accumulates brake fluid conveyed by the motor and pump.
Motor Relay
Operates the motor ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
Actuator Relay (Main Relay)
Operates each valve ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
ABS IN Valve and ABS OUT Valve
Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and
electric unit (control unit).
Cut Valve 1, Cut Valve 2
Shuts off the ordinary brake line from master cylinder to signals from ABS actuator and electric unit (control
unit).
Suction Valve 1
Suction Valve 1 switches the brake path to convey accu mulator pressure to the front system, according to a
signal transmitted from the ABS actuat or and electric unit (control unit).
Suction Valve 2
Suction valve 2 releases accumulator pressure, accord ing to a signal transmitted from the ABS actuator and
electric unit (control unit).
Control Pressure Sensor (models with Advanced Driver Assistance System)
Detects the brake fluid pressure of brake caliper side and transmits a signal to ABS actuator and electric unit
(control unit).
Accumulator Pressure Sensor
The accumulator pressure sensor detects brake fluid pressure accumulated in the accumulator and conveys
the detected result to the ABS act uator and electric unit (control unit).
Master cylinder Pressure Sensor
Detects the brake fluid pressure of master cylinder part and transmits a signal to ABS actuator and electric unit
(control unit).
Wheel Sensor and Sensor RotorINFOID:0000000006222562
NOTE:
 Wheel sensor and sensor rotor is integrated in wheel hub assembly.
 Never measure resistance and voltage value using a tester because sensor is active sensor.
Revision: 2010 May2011 QX56

COMPONENT PARTSBRC-15
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
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K L
M A
B
BRC
N
O P
 Downsize and weight reduction is aimed. IC for detection portion and magnet for sensor rotor are adopted.
 Power supply is supplied to detection portion so that magnetic field
line is read. Magnetic field that is detected is converted to current
signal.
 When sensor rotor rotates, magnetic field changes. Magnetic field
change is converted to current signals (rectangular wave) and is
transmitted to ABS actuator and electric unit (control unit). Change
of magnetic field is pr oportional to wheel speed.
Stop Lamp SwitchINFOID:0000000006222563
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Steering Angle SensorINFOID:0000000006222564
Detects the following information and transmits steering angle signal to ABS actuator and electric unit (control
unit) via CAN communication.
 Steering wheel rotation amount
 Steering wheel rotation angular velocity
 Steering wheel rotation direction
Yaw Rate/Side/Decel G sensorINFOID:0000000006222565
Calculates the following information that affects the v ehicle and transmits a signal to ABS actuator and electric
unit (control unit) via communication lines.
 Vehicle rotation angular velocity (yaw rate signal)
 Vehicle lateral acceleration (side G signal) / longitudinal acceleration (decel G signal)
Brake Fluid Level SwitchINFOID:0000000006222566
Detects the brake fluid level in reservoir tank and trans mits converted electric signal from ABS actuator and
electric unit (control unit), when brake fluid level is the specified level or less.
Parking Brake SwitchINFOID:0000000006222567
Detects the operation status of parking brake switch and transmits converted electric signal from combination
meter to ABS actuator and electric unit (control unit).
VDC OFF SwitchINFOID:0000000006222568
 VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
 The operation of the VDC OFF switch enables the arbi trary switching of the VDC function between stop sta-
tus and standby status. The status of the function is indicated by the VDC OFF indicator lamp. (ON: Non-
operational status, OFF: Standby status)
- VDC function NOTE:
Brake limited slip differentia l (BLSD) control operates.
- TCS function
 VDC OFF indicator lamp turns OFF (standby status) when the engine is started again after it is stopped once while VDC OFF indicator lamp is ON (non-operational status).
JPFIC0131GB
Revision: 2010 May2011 QX56

BRC-16
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
SYSTEM
System DescriptionINFOID:0000000006222569
 The system switches fluid pressure of each brake caliper to increase, to hold or to decrease according to
signals from control unit in ABS actuator and electric unit (control unit). This control system is applied to
VDC function, TCS function, ABS func tion, EBD function, hill start assist function and brake limited slip dif-
ferential (BLSD) function
 Fail-safe function is available for each function and is activated by each function when system malfunction occurs.
 The adoption of the 4WD switch assembly (4WD sh ift switch and VDC OFF switch) enables to change the
control characteristics of the VDC function, the TCS function and the brake limited slip differential (BLSD)
function into an optimal characteristics, based on a st ate of the 4WD shift switch. (Models with 4WD system)
SYSTEM DIAGRAM
NOTE:
Transfer control unit is appli ed to models with 4WD system.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JPFIC0182GB
Component Signal description
Yaw rate/side/decel G sensor Mainly transmits the follo
wing signals to ABS actuator and elec tric unit (control unit) via com-
munication line
*1.
 Yaw rate signal
 Side G sensor signal
 Decel G sensor signal
ECM Mainly transmits the follo
wing signals to ABS actuator and elec tric unit (control unit) via CAN
communication.
 Accelerator pedal position signal
 Engine speed signal
Mainly receives the following si gnals from ABS actuator and electr ic unit (control unit) via CAN
communication.
 Target throttle position signal
Revision: 2010 May2011 QX56