Infiniti QX56 (Z62). Manual — part 517
EC-46
< SYSTEM DESCRIPTION >
[VK56VD]
SYSTEM
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM via the CAN communication line.
SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.
AIR CONDITIONING CUT CONTROL
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor
Camshaft position sensor
• Engine speed*
1
• Piston position
EVAP canister
purge flow control
EVAP canister purge volume
control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Battery
Battery voltage*
1
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
Fuel temperature in fuel tank
EVAP control system pressure sensor
Pressure in purge line
Combination meter
Vehicle speed*
2
PBIB1631E
SYSTEM
EC-47
< SYSTEM DESCRIPTION >
[VK56VD]
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AIR CONDITIONING CUT CONTROL : System Diagram
INFOID:0000000006217713
AIR CONDITIONING CUT CONTROL : System Description
INFOID: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
control
IPDM 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
EC-48
< SYSTEM DESCRIPTION >
[VK56VD]
SYSTEM
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Diagram
INFOID:0000000006217715
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description
INFOID: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 driver 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 throttle 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 (ASCD) : Switch Name and Function"
operating instructions.
CAUTION:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
CAN COMMUNICATION
CAN COMMUNICATION : System Description
INFOID: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 speed 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 CAN 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"
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
Stop lamp switch
TCM
Park/neutral position signal
Output shaft revolution signal*
Combination meter
Vehicle speed signal*
OPERATION
EC-49
< SYSTEM DESCRIPTION >
[VK56VD]
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OPERATION
AUTMATIC SPEED CONTROL DEVICE (ASCD)
AUTMATIC SPEED CONTROL DEVICE (ASCD) : Switch Name and Function
INFOID:0000000006217719
SWITCHES AND INDICATORS
SET SPEED RANGE
ASCD system can be set the following vehicle speed.
SWITCH OPERATION
CANCEL CONDITION
• When any of following conditions exist, the cruise operation is canceled.
- CANCEL switch is pressed
- ASCD MAIN switch pressed (Set speed is cleared)
- More than two switches at ASCD steering switch are pressed at the same time (Set speed is cleared)
- Brake pedal is depressed
- Selector lever position is changed to N, P or R
- Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
- TCS system is operated
• When the ECM detects any of the following conditions, the ECM cancels the cruise operation and informs
the driver by blinking CRUISE indicator lamp.
1.
CRUISE indicator lamp
2.
CANCEL switch
3.
ASCD MAIN switch
4.
SET/COAST switch
5.
RESUME/ACCELERATE switch
A.
On the combination meter
B.
On the steering wheel
JPBIA3226ZZ
Minimum speed (Approx.)
Maximum speed (Approx.)
40 km/h (25 MPH)
143 km/h (88 MPH)
Item
Function
CANCEL switch
Cancels the cruise control driving.
RESUME/ACCELERATE switch
• Resumes the set speed.
• Increases speed incrementally during cruise control driving.
SET/COAST switch
• Sets desired cruise speed.
• Decreases speed incrementally during cruise control driving.
ASCD MAIN switch
Master switch to activate the ASCD system.
(CRUISE indicator lamp is turned ON when ASCD system is ON.)
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