diagram INFINITI QX56 2011 Factory Service Manual

SYSTEMEC-45
< SYSTEM DESCRIPTION > [VK56VD]
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VVEL (Variable Valve Event & Lift) is a system that
controls valve event and valve lift continuously.
ECM decides the target valve lift according to the driving condition and sends the command signal to the
VVEL control module via ENG communication line.
VA LV E L I F T O P E R AT I O N
Rotational movement of the drive shaft equipped with eccentric cam
is transmitted to output cam via the rocker arm and two kinds of links
to depress the intake valve.
VA R I A B L E O P E R AT I O N
VVEL control module controls the ro tation of the control shaft using
the VVEL actuator motor assembly and changes the movement of
the output cam by shifting the link supporting point. As a result, valve
lift changes continuously to improve engine output and response.
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM : System DiagramINFOID:0000000006256911
EVAPORATIVE EMISSION SYSTEM : System DescriptionINFOID:0000000006256912
INPUT/OUTPUT SIGNAL CHART
1. Link B
2. Output cam
3. Eccentric cam
4. Drive shaft
5. Link A
6. Rocker arm
JSBIA0464ZZ
1. Link B
2. Output cam
3. Control shaft
4. Rocker arm
JSBIA0465ZZ
JSBIA0371GB
Revision: 2010 May2011 QX56

SYSTEMEC-47
< SYSTEM DESCRIPTION > [VK56VD]
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AIR CONDITIONING CUT CONTROL : System DiagramINFOID:0000000006217713
AIR CONDITIONING CUT CONTROL : System DescriptionINFOID:0000000006217714
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
 When the accelerator pedal is fully depressed.
 When cranking the engine.
 At high engine speeds.
 When the engine coolant temperature becomes excessively high.
 When operating power steering during low engine speed or low vehicle speed.
 When engine speed is excessively low.
 When refrigerant pressure is excessively low or high.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
JMBIA1457GB
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor
Camshaft position sensor Engine speed*
2
Air conditioner cut
controlIPDM E/R
↓
A/C relay
↓
Compressor
Engine coolant temperature sensor Engine coolant temperature
Accelerator pedal position sensor Accelerator pedal position
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
A/C auto amp.A/C ON signal*
1
A/C evaporator temperature*1
Target A/C evaporator temperature*1
Blower fan ON signal
Combination meter Vehicle speed*
1
Revision: 2010 May2011 QX56

EC-48
< SYSTEM DESCRIPTION >[VK56VD]
SYSTEM
AUTOMATIC SPEED CONTROL DEVI CE (ASCD) : System Diagram
INFOID:0000000006217715
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System DescriptionINFOID:0000000006217716
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the CAN communication line
BASIC ASCD SYSTEM
 Automatic Speed Control Device (ASCD) allows a dr iver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can be set the vehicle speed in the set speed range.
 ECM controls throttle angle of electric th rottle control actuator to regulate engine speed.
 Operation status of ASCD is indicated in combination meter.
 If any malfunction occurs in the ASCD system, it automatically deactivates the ASCD control.
Refer to EC-49, "
AUTMATIC SPEED CONTROL DEVICE (A SCD) : Switch Name and Function" for ASCD
operating instructions.
CAUTION:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
CAN COMMUNICATION
CAN COMMUNICATION : System DescriptionINFOID:0000000006217718
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s peed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CA N communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart", about CAN com-
munication for detail.
JPBIA3272GB
Sensor Input signal to ECM ECM function Actuator
ASCD steering switch ASCD steering switch operation
ASCD vehicle speed control Electric throttle control ac-
tuator
 Combination meter
ASCD brake switch
Brake pedal operation
Sto p l am p s w it ch
TCM Park/neutral position signal
Output shaft revolution signal*
Combination meter Vehicle speed signal*
Revision: 2010 May2011 QX56

EC-114
< WIRING DIAGRAM >[VK56VD]
ENGINE CONTROL SYSTEM
WIRING DIAGRAM
ENGINE CONTROL SYSTEM
Wiring DiagramINFOID:0000000006217736
JCBWM2089GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-115
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JCBWM2090GB
Revision: 2010 May2011 QX56

EC-116
< WIRING DIAGRAM >[VK56VD]
ENGINE CONTROL SYSTEM
JCBWM2091GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-117
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JCBWM2092GB
Revision: 2010 May2011 QX56

EC-118
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ENGINE CONTROL SYSTEM
JCBWM2093GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-119
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JCBWM2094GB
Revision: 2010 May2011 QX56

EC-120
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ENGINE CONTROL SYSTEM
JCBWM2095GB
Revision: 2010 May2011 QX56