steering INFINITI QX56 2011 Factory Service Manual

CCS-3
C
DE
F
G H
I
J
K L
M B
CCS
N
P A
ICC SENSOR : Diagnosis Procedure .................
..
112
C1A24 NP RANGE ...........................................113
DTC Logic ........................................................... ..113
Diagnosis Procedure .............................................113
C1A26 ECD MODE MALFUNCTION ...............115
DTC Logic ........................................................... ..115
Diagnosis Procedure .............................................115
C1A27 ECD POWER SUPPLY CIRCUIT .........116
DTC Logic ........................................................... ..116
Diagnosis Procedure .............................................116
C1A2A ICC SENSOR POWER SUPPLY CIR-
CUIT ..................................................................
117
DTC Logic ........................................................... ..117
Diagnosis Procedure .............................................117
C1A33 CAN TRANSMISSION ERROR ...........118
DTC Logic ........................................................... ..118
Diagnosis Procedure .............................................118
C1A34 COMMAND ERROR .............................119
DTC Logic ........................................................... ..119
Diagnosis Procedure .............................................119
C1A35 ACCELERATOR PEDAL ACTUATOR ..120
DTC Logic ........................................................... ..120
Diagnosis Procedure .............................................120
C1A36 ACCELERATOR PEDAL ACTUATOR
CAN COMM ......................................................
121
DTC Logic ........................................................... ..121
Diagnosis Procedure .............................................121
C1A37 ACCELERATOR PEDAL ACTUATOR
CAN 2 ...............................................................
122
DTC Logic ........................................................... ..122
Diagnosis Procedure .............................................122
C1A38 ACCELERATOR PEDAL ACTUATOR
CAN 1 ...............................................................
123
DTC Logic ........................................................... ..123
Diagnosis Procedure .............................................123
C1A39 STEERING ANGLE SENSOR ..............124
ADAS CONTROL UNIT ......................................... ..124
ADAS CONTROL UNIT : DTC Logic ....................124
ADAS CONTROL UNIT : Diagnosis Procedure ....124
ICC SENSOR ......................................................... ..124
ICC SENSOR : DTC Logic ....................................124
ICC SENSOR : Diagnosis Procedure ...................125
C1A40 SYSTEM SWITCH CIRCUIT ................126
DTC Logic ........................................................... ..126
Diagnosis Procedure .............................................126
Component Inspection (IBA OFF Switch) .............127
C1A50 ADAS CONTROL UNIT .......................128
DTC Logic ............................................................ ..128
Diagnosis Procedure .............................................128
C1F01 ACCELERATOR PEDAL ACTUATOR .129
DTC Logic ............................................................ ..129
Diagnosis Procedure .............................................129
C1F02 ACCELERATOR PEDAL ACTUATOR .130
DTC Logic ............................................................ ..130
Diagnosis Procedure .............................................130
C1F05 ACCELERATOR PEDAL ACTUATOR
POWER SUPPLY CIRCUIT ............................
131
DTC Logic ..............................................................131
Diagnosis Procedure .............................................131
U0104 ADAS CAN 1 .......................................132
DTC Logic ............................................................ ..132
Diagnosis Procedure .............................................132
U0121 VDC CAN 2 ..........................................133
ADAS CONTROL UNIT ......................................... ..133
ADAS CONTROL UNIT : DTC Logic .....................133
ADAS CONTROL UNIT : Diagnosis Procedure ....133
ICC SENSOR ......................................................... ..133
ICC SENSOR : DTC Logic ....................................133
ICC SENSOR : Diagnosis Procedure ....................134
U0126 STRG SEN CAN 1 ...............................135
ADAS CONTROL UNIT ......................................... ..135
ADAS CONTROL UNIT : DTC Logic .....................135
ADAS CONTROL UNIT : Diagnosis Procedure ....135
ICC SENSOR ......................................................... ..135
ICC SENSOR : DTC Logic ....................................135
ICC SENSOR : Diagnosis Procedure ....................136
U0235 ICC SENSOR CAN 1 ...........................137
DTC Logic ............................................................ ..137
Diagnosis Procedure .............................................137
U0401 ECM CAN 1 .........................................138
DTC Logic ..............................................................138
Diagnosis Procedure .............................................138
U0402 TCM CAN 1 ..........................................139
DTC Logic ............................................................ ..139
Diagnosis Procedure .............................................139
U0405 ADAS CAN 2 .......................................140
DTC Logic ............................................................ ..140
Diagnosis Procedure .............................................140
U0415 VDC CAN 1 ..........................................141
ADAS CONTROL UNIT ......................................... ..141
ADAS CONTROL UNIT : DTC Logic .....................141
ADAS CONTROL UNIT : Diagnosis Procedure ....141
ICC SENSOR ......................................................... ..141
Revision: 2010 May2011 QX56

CCS-4
ICC SENSOR : DTC Logic ....................................141
ICC SENSOR : Diagnosis Procedure ....................142
U0428 STRG SEN CAN 2 ................................143
ADAS CONTROL UNIT ......................................... ..143
ADAS CONTROL UNIT : DTC Logic .....................143
ADAS CONTROL UNIT : Diagnosis Procedure .....143
ICC SENSOR ......................................................... ..143
ICC SENSOR : DTC Logic ....................................143
ICC SENSOR : Diagnosis Procedure ....................144
U1000 CAN COMM CIRCUIT ..........................145
ADAS CONTROL UNIT ......................................... ..145
ADAS CONTROL UNIT : Description ....................145
ADAS CONTROL UNIT : DTC Logic .....................145
ADAS CONTROL UNIT : Diagnosis Procedure .....145
ICC SENSOR ......................................................... ..145
ICC SENSOR : Description ...................................145
ICC SENSOR : DTC Logic ....................................145
ICC SENSOR : Diagnosis Procedure ....................146
U1010 CONTROL UNIT (CAN) .......................147
ADAS CONTROL UNIT ......................................... ..147
ADAS CONTROL UNIT : Description ....................147
ADAS CONTROL UNIT : DTC Logic .....................147
ADAS CONTROL UNIT : Diagnosis Procedure .....147
ICC SENSOR ......................................................... ..147
ICC SENSOR : Description ...................................147
ICC SENSOR : DTC Logic ....................................147
ICC SENSOR : Diagnosis Procedure ....................147
U150B ECM CAN 3 .........................................148
DTC Logic ............................................................ ..148
Diagnosis Procedure .............................................148
U150C VDC CAN 3 ..........................................149
DTC Logic ............................................................ ..149
Diagnosis Procedure .............................................149
U150D TCM CAN 3 ..........................................150
DTC Logic ............................................................ ..150
Diagnosis Procedure .............................................150
U150E BCM CAN 3 .........................................151
DTC Logic ............................................................ ..151
Diagnosis Procedure .............................................151
U1502 ICC SENSOR CAN COMM CIRC ........152
DTC Logic ............................................................ ..152
Diagnosis Procedure .............................................152
U1513 METER CAN 3 .....................................153
DTC Logic ............................................................ ..153
Diagnosis Procedure .............................................153
U1514 STRG SEN CAN 3 ................................154
DTC Logic ............................................................ ..154
Diagnosis Procedure ............................................ .154
U1515 ICC SENSOR CAN 3 ............................155
DTC Logic ............................................................ .155
Diagnosis Procedure .............................................155
U1517 ACCELERATOR PEDAL ACTUATOR
CAN 3 ...............................................................
156
DTC Logic ............................................................ .156
Diagnosis Procedure .............................................156
U1520 4WD CAN 3 ...........................................157
DTC Logic ............................................................ .157
Diagnosis Procedure .............................................157
POWER SUPPLY AND GROUND CIRCUIT ....158
ADAS CONTROL UNIT .......................................... .158
ADAS CONTROL UNIT : Diagnosis Procedure ....158
ICC SENSOR .......................................................... .158
ICC SENSOR : Diagnosis Procedure ...................158
SYMPTOM DIAGNOSIS ...........................160
INTELLIGENT CRUISE CONTROL SYSTEM
SYMPTOMS .................................................... ..
160
Symptom Table .................................................... .160
MAIN SWITCH DOES NOT TURN ON, MAIN
SWITCH DOES NOT TURN OFF .....................
161
Description ........................................................... .161
Diagnosis Procedure .............................................161
ICC SYSTEM CANNOT BE SET (MAIN
SWITCH TURNS ON/OFF) ...............................
162
Description ........................................................... .162
Diagnosis Procedure .............................................162
ICC STEERING SWITCH (OTHER THAN
MAIN SWITCH) DOES NOT FUNCTION .........
164
Description ........................................................... .164
Diagnosis Procedure .............................................164
ICC SYSTEM DOES NOT CANCEL WHEN A/
T SELECTOR LEVER SETS ON "N" ...............
165
Description ........................................................... .165
Diagnosis Procedure .............................................165
CHIME DOES NOT SOUND .............................166
Description ........................................................... .166
Diagnosis Procedure .............................................166
DRIVING FORCE IS HUNTING ........................168
Description ........................................................... .168
Diagnosis Procedure .............................................168
FREQUENTLY CANNOT DETECT THE VEHI-
CLE AHEAD / DETECTION ZONE IS SHORT ..
169
Description ........................................................... .169
Diagnosis Procedure .............................................169
Revision: 2010 May2011 QX56

CCS-5
C
DE
F
G H
I
J
K L
M B
CCS
N
P A
THE SYSTEM DOES NOT DETECT THE VE-
HICLE AHEAD AT ALL .................................. ..
171
Description .......................................................... ..171
Diagnosis Procedure .............................................171
NORMAL OPERATING CONDITION ...............173
Description .......................................................... ..173
REMOVAL AND INSTALLATION .............176
ICC SENSOR .................................................. ..176
Exploded View .................................................... ..176
Removal and Installation ..................................... ..176
ICC STEERING SWITCH ................................177
Exploded View .......................................................177
ASCD
SYSTEM DESCRIPTION .... .......................
178
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ............................................................
178
Information ........................................................... ..178
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-9
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006224265
1. ICC steering switch 2. Information display, ICC system warning lamp, IBA OFF indicator
lamp, buzzer
(On the combination meter)3. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Compon ent Parts Loca-
tion"
4. Transfer control unit
Refer to DLN-10, "
Component Parts
Location"
5. ICC brake hold relay 6. ECM
Refer to EC-16, "
Component Parts
Location"
7. ICC sensor 8. TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion"
9. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "
Component Parts
Location"
10. Stop lamp switch 11. ICC brake switch 12. IBA OFF switch
JSOIA0362ZZ
Revision: 2010 May2011 QX56

CCS-10
< SYSTEM DESCRIPTION >[ICC]
COMPONENT PARTS
Component Description
INFOID:0000000006224266
× : Applicable
13. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location"
14. ADAS control unit
Refer to DAS-13, "
Component Parts
Location"
A. Back side of engine room (RH) B. Front bumper (center) C. Upper side of brake pedal
D. Under side of inst rument lower driver
panel
Component Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
ADAS control unit ×××× ADAS control unit calculates a target distance between vehicles
and a target speed, based on signals received from each sensor
and switch to transmit an engine torque command value to ECM
and a brake fluid pres sure control signal to ABS actuator and
electric unit (control unit) via CAN communication
 ADAS control unit transmits buzzer output signal to combination
meter via CAN communication
ICC sensor ×××× ICC sensor detects light reflected from a vehicle ahead by irra-
diating laser forward and calculates a distance from the vehicle
ahead and a relative speed, based on the detected signal
 ICC sensor transmits the presence/absence of vehicle ahead and the distance from the vehicle to ADAS control unit via ITS
communication
ECM ×××× ECM transmits the accelerator pedal position signal, ICC brake
switch signal, stop lamp switch signal, ICC steering switch sig-
nal, etc. to ADAS control unit via CAN communication
 ECM controls the electric throttle control actuator based on the engine torque demand received from the ADAS control unit via
CAN communication
ABS actuator and electric unit
(control unit) ×××× ABS actuator and electric unit (control unit) transmits the vehicle
speed signal (wheel speed), stop lamp signal and VDC/TCS/
ABS system operation condition to ADAS control unit via CAN
communication
 ABS actuator and electric unit (control unit) controls the brake, based on a brake fluid pressure control signal received from the
ADAS control unit via CAN communication
BCM ×BCM transmits the front wiper request signal to ADAS control unit
via CAN communication
TCM ××TCM transmits the signal related to A/T control to ADAS control
unit via CAN communication
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-11
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
NOTE:
Only IBA system uses
Combination meter ××××Performs the following operations using the signals received from
the ADAS control unit via the CAN communication
 Displays the ICC system operation status using the meter dis-
play signal
 Illuminates the ICC system warning lamp using the ICC warning
lamp signal
 Illuminates the IBA OFF indicator lamp using the IBA OFF indi- cator lamp signal
 Operates the buzzer (ICC warning chime) using the buzzer out- put signal
ICC steering switch ×× ICC steering switch allows the ON/OFF of the Intelligent Cruise
Control and the settings of a vehicle speed and distance be-
tween vehicles
 ICC steering switch signal is transmitted to ECM. ECM transmits the signal to the ADAS control unit via CAN communication
ICC brake switch ×××× ICC brake switch is turned OFF and stop lamp switch is turned
ON, when depressing the brake pedal
 ICC brake switch signal is input to ECM. These signals are transmitted from ECM to ADAS control unit via CAN communi-
cation
 Stop lamp switch signal is in put to ECM and ABS actuator and
electric unit (control unit). These signals are transmitted from
ECM and ABS actuator and electric unit (control unit) to ADAS
control unit via CAN communication
Stop lamp switch
××××
ICC brake hold relay ××ICC brake hold relay activates the stop lamp by ICC brake hold re-
lay drive signal (stop lamp drive signal) outputted by the ADAS
control unit
Transfer control unit ××××Transfer control unit transmits a mode selection state of 4WD shift
switch to the ADAS control unit via CAN communication
IBA OFF switch ×
NoteIBA OFF switch signal is input to the ADAS control unit
Steering angle sensor ×Measures the rotation amount, rotation speed, and rotation direc-
tion of steering wheel, and then transmits them to ADAS control
unit via CAN communication
Component
Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
Revision: 2010 May2011 QX56

CCS
SYSTEMCCS-13
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
Transmit unit Signal name Description
ECM CAN com-
munica-
tionClosed throttle position signal Receives idle position state (ON/OFF)
Accelerator pedal position signal Receives accelerator pedal position (angle)
ICC prohibition signal
Receives an operable/inoperable state of the ICC sys-
tem
ICC steering switch
signal Main switch signal
Receives the operational state of the ICC steering
switch
SET/COAST switch
signal
CANCEL switch sig-
nal
RESUME/ACCEL-
ERATE switch signal
DISTANCE switch
signal
Engine speed signal Receives engine speed
Stop lamp switch signal Receives an operational state of the brake pedal
ICC brake switch signal Receives an operational state of the brake pedal
Snow mode signal Receives an operational state of the snow mode
TCM CAN com-
munica-
tionInput speed signal Receives the number of revolutions of input shaft
Current gear position signal Receives a current gear position
Shift position signal Receives a selector lever position
Output shaft revolution signal Receives the number of revolutions of output shaft
ABS actuator
and electric unit
(control unit) CAN com-
munica-
tionABS malfunction signal Receives
a malfunction state of ABS
ABS operation signal Receives an operational state of ABS
ABS warning lamp signal Receives an ON/OFF state of ABS warning lamp
TCS malfunction signal Receives a malfunction state of TCS
TCS operation signal Receives an operational state of TCS
VDC OFF switch signal Receives an ON/OFF state of VDC
VDC malfunction signal Receives a malfunction state of VDC
VDC operation signal Receives an operational state of VDC
Vehicle speed signal (ABS) Receives wheel speeds of four wheels
Stop lamp switch signal Receives an operational state of the brake pedal
Yaw rate signal Receives yaw rate acting on the vehicle
Combination
meter CAN com-
munica-
tion
Parking brake switch signal Receives an operational state of the parking brake
BCM CAN com-
munica-
tion
Front wiper request signal Receives an operational state of front wiper(s)
Steering angle
sensor CAN com-
munica-
tionSteering angle sensor malfunction signal Receives a malfunction state of steering angle sensor
Steering angle sensor signal
Receives the number of revolutions, turning direction of
the steering wheel
Steering angle speed signal Receives the turning angle speed of the steering wheel
Transfer control
unit CAN com-
munica-
tion
Current 4WD mode signal Receives a mode selection state of the 4WD mode
Revision: 2010 May2011 QX56

CCS
OPERATIONCCS-23
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
NOTE:
The display of the DCA system is given priority when the DCA system is ON in a standby mode. (The set vehi-
cle speed indicator, set distance indicator, and own vehicle indicator are not displayed).
APPROACH WARNING DISPLAY
If own vehicle comes closer to a vehicle ahead due to rapi d deceleration of that vehicle or if another vehicle
cuts in, the system warns the driver with the chim e and ICC system display. Decelerate by depressing the
brake pedal to maintain a safe vehicle distance if:
 The chime sounds.
 The vehicle ahead detection indicator and set distance indicator blink.
The warning chime may not sound in some cases when there is a short distance between vehicles. Some
examples are:
 When the vehicles are traveling at the same s peed and the distance between vehicles is not changing.
 When the vehicle ahead is traveling faster and the distance between vehicles is increasing.
 When a vehicle cuts in at near own vehicle.
The warning chime will not sound when own vehicle approac hes vehicles that are parked or moving slowly.
The warning chime will not sound when the accele rator pedal is depressed, overriding the system.
The approach warning chime may sound and the system disp lay may blink when the ICC sensor detects some
reflectors which are fitted on vehicles in other lanes or on the side of the road.
This may cause the ICC system to dec elerate or accelerate the vehicle.
The ICC sensor may detect these reflectors when the vehicle is driven on winding roads, hilly roads or when
entering or exiting a curve.
The ICC sensor may also detect reflectors on narrow roads or in road construction zones.
In these cases driver will have to manually control the proper distance ahead of own vehicle.
Also, the sensor sensitivity can be affected by vehicle operation (steering maneuver or driving position in the
lane) or traffic or vehicle condition (for example, if a vehicle is being driven with some damage).
Control mode With a vehicle
aheadSet vehicle distance (Long)
Set vehicle distance (Middle)
Set vehicle distance (Short)
When the vehicle speed exceeds the set speed
Condition Display on ICC system display
JSOIA0297ZZ
JSOIA0298ZZ
JSOIA0299ZZ
JSOIA0300ZZ
Revision: 2010 May2011 QX56

CCS-28
< SYSTEM DESCRIPTION >[ICC]
HANDLING PRECAUTION
 The ICC system does not control vehicle speed or warn
the driver when own vehicle approaches stationary
and slow moving vehicles. The driver must pay attent ion to vehicle operation to maintain proper distance
from vehicles ahead when approaching toll gates or traffic congestion.
 The detection zone of the ICC sens or is limited. A vehicle ahead
must be in the detection zone for the vehicle-to-vehicle distance
detection mode to maintain the selected distance from the vehicle
ahead. A vehicle ahead may move outside of the detection zone
due to its position within the same lane of travel. Motorcycles may
not be detected in the same lane ahead if they are traveling offset
from the center line of the lane. A vehicle that is entering the lane
ahead may not be detected until the vehicle has completely moved
into the lane. If this occurs, the ICC system may warn the driver by
blinking the system indicator and sounding the chime. The driver
may have to manually control the proper distance away from vehi-
cle traveling ahead.
 When driving on some roads, such as winding, hilly, curved, nar- row roads, or roads which are under construction, the ICC sensor
may detect vehicles in a differ ent lane, or may temporarily not
detect a vehicle traveling ahead. This may cause the ICC system
to decelerate or accelerate the vehicle. The detection of vehicles
may also be affected by vehicle operation (steering maneuver or
traveling position in the lane, et c.) or vehicle condition. If this
occurs, the ICC system may warn the driver by blinking the system
indicator and sounding the chime unexpectedly. The driver will
have to manually control the proper distance away from the vehicle
traveling ahead.
JPOIA0221ZZ
JPOIA0220ZZ
Revision: 2010 May2011 QX56

CCS
HANDLING PRECAUTIONCCS-29
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
 When driving on the freeway at a set speed and approaching a slower traveling vehicle ahead, the ICC will adjust the speed to
maintain the distance, selected by the driver, from the vehicle
ahead. If the vehicle ahead changes lanes or exits the freeway, the
ICC system will accelerate and maintain the speed up to the set
speed. Pay attention to the driving operation to maintain control of
the vehicle as it accelerates to the set speed. The vehicle may not
maintain the set speed on winding or hilly roads. If this occurs, the
driver will have to manually control the vehicle speed.
 The sensor sensitivity can be affected by vehicle oper ation (steering maneuver or driving position in the
lane) or traffic or vehicle condition (for exampl e, if a vehicle is being driven with some damage).
 Normally when controlling the distance to a vehicle ahead, this system automatically accelerates or deceler-
ates own vehicle according to the speed of the vehi cle ahead. Depress the accelerator to properly acceler-
ate own vehicle when acceleration is required for a lane change. Depress the brake pedal when
deceleration is required to maintain a safe distance to the vehicle ahead due to its sudden braking or if a
vehicle cuts in. Always stay alert when using the ICC system.
Precautions for Conventional (Fix ed Speed) Cruise Control ModeINFOID:0000000006224277
 In the conventional (fixed speed) cruise control mode, a warning chime does not sound to warn the driver if
own vehicle is too close to the vehicle ahead, as nei ther the presence of the vehicle ahead nor the vehicle-
to-vehicle distance is detected.
 Pay special attention to the distance between own v ehicle and the vehicle ahead or a collision could occur.
 Always confirm the setting in the ICC system display.
 Do not use the conventional (fixed speed) cruise c ontrol mode when driving under the following conditions:
- When it is not possible to keep the vehicle at a set speed.
- In heavy traffic or in traffic that varies in speed.
- On winding or hilly roads.
- On slippery roads (rain, snow, ice, etc.).
- In very windy areas.
 Doing so could cause a loss of vehicle control and result in an accident.
 To avoid accidentally engaging cruise control, make sure to the MAIN switch OFF when not using ICC sys- tem.
JPOIA0219ZZ
Revision: 2010 May2011 QX56