2010 INFINITI QX56 Factory Service Manual

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Page 1385 of 4210

INFINITI QX56 2010 Factory Service Manual EC-32
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AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL
Input/Output Signal ChartINFOID:0000000005149066
*1: This signal is sent to the ECM through CAN communica

Page 1386 of 4210

INFINITI QX56 2010 Factory Service Manual AUTOMATIC SPEED CONTROL DEVICE (ASCD)EC-33
< FUNCTION DIAGNOSIS > [VK56DE]
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000005149068
INPUT/OUTPUT

AUTOMATIC SPEED CONTROL DEVICE (ASCD)EC-33
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000005149068
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 thro ttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE i ndicator 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 indicato r 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 cr uise control driving, increase the vehicle speed until
the switch is released or vehicle speed reac hes maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exis t, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steer ing 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 indicator may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE indicator 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 indicator 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 functionActuator
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
Wheel sensor Vehicle speed*
TCM Gear position
Powertrain revolution*
Revision: April 20092010 QX56

Page 1387 of 4210

INFINITI QX56 2010 Factory Service Manual EC-34
< FUNCTION DIAGNOSIS >[VK56DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
When the RESUME/ACCELERATE
switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle sp

Page 1388 of 4210

INFINITI QX56 2010 Factory Service Manual CAN COMMUNICATIONEC-35
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CAN COMMUNICATION
System DescriptionINFOID:0000000005149070
CAN (Controller Area Network) is a serial communicati

Page 1389 of 4210

INFINITI QX56 2010 Factory Service Manual EC-36
< FUNCTION DIAGNOSIS >[VK56DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
DescriptionINFOID:0000000005149071
SYSTEM DESCRIPTION
Cooling Fan Control
*1: The ECM determines the start signal status by

Page 1390 of 4210

INFINITI QX56 2010 Factory Service Manual EVAPORATIVE EMISSION SYSTEMEC-37
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EVAPORATIVE EMISSION SYSTEM
DescriptionINFOID:0000000005149072
SYSTEM DESCRIPTION
The evaporative emiss

Page 1391 of 4210

INFINITI QX56 2010 Factory Service Manual EC-38
< FUNCTION DIAGNOSIS >[VK56DE]
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING
JMBIA1703GB
Revision: April 20092010 QX56

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INFINITI QX56 2010 Factory Service Manual EVAPORATIVE EMISSION SYSTEMEC-39
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JMBIA1702GB
Revision: April 20092010 QX56

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