Infiniti M35/M45 Y50. Manual — part 566
AIR CONDITIONING CUT CONTROL
EC-737
[VK45DE]
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AIR CONDITIONING CUT CONTROL
PFP:23710
Input/Output Signal Chart
NBS0059M
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
System Description
NBS0059N
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.
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When cranking the engine.
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At high engine speeds.
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When the engine coolant temperature becomes excessively high.
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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.
Sensor
Input Signal to ECM
ECM function
Actuator
Air conditioner switch
Air conditioner ON signal*
1
Air conditioner
cut control
Air conditioner relay
Accelerator pedal position sensor
Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
2
Engine coolant temperature sensor
Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor
Refrigerant pressure
Power steering pressure sensor
Power steering operation
Wheel sensor
Vehicle speed*
1
EC-738
[VK45DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
PFP:18930
System Description
NBS0059O
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 throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE lamp and SET lamp in combination meter. If any malfunc-
tion 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 lamp 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 lamp in combination meter illuminates.)
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
●
CANCEL switch is pressed
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More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
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Brake pedal is depressed
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Selector lever is changed to N, P, R position
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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 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 lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp 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 lamp 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.
Sensor
Input signal to ECM
ECM function
Actuator
ASCD brake switch
Brake pedal operation
ASCD vehicle speed control
Electric throttle control
actuator
Stop lamp switch
Brake pedal operation
ASCD steering switch
ASCD steering switch operation
Park/Neutral position (PNP)
switch
Gear position
Wheel sensor
Vehicle speed*
TCM
Powertrain revolution*
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-739
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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
When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.
●
Brake pedal is released
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A/T selector lever is in other than P and N positions
●
Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)
Component Description
NBS0059P
ASCD STEERING SWITCH
Refer to
.
ASCD BRAKE SWITCH
Refer to
, and
STOP LAMP SWITCH
Refer to
,
and
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to
,
,
and
ASCD INDICATOR
Refer to
.
EC-740
[VK45DE]
CAN COMMUNICATION
CAN COMMUNICATION
PFP:23710
System Description
NBS0059Q
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-50, "CAN System Specification Chart"
, about CAN communication for detail.
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