Nissan Frontier. Instruction — part 603
AIR CONDITIONING CUT CONTROL
EC-983
< SYSTEM DESCRIPTION >
[VQ40DE FOR MEXICO]
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AIR CONDITIONING CUT CONTROL
Input/Output Signal Chart
INFOID:0000000009481682
*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
INFOID:0000000009481683
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.
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-984
< SYSTEM DESCRIPTION >
[VQ40DE FOR MEXICO]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
INFOID:0000000009481684
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the CAN communication line.
BASIC ASCD SYSTEM
Refer to Owner's Instruction 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 indicator and SET indicator in combination meter. If any
malfunction occurs in the ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicator 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 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 maintain the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches on ASCD steering switch are pressed at the same time (Set speed will be 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
• 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 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 depressing 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 while 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 maintain the new set speed.
RESUME OPERATION
Sensor
Input signal to ECM
ECM function
Actuator
Brake pedal position 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
TCM
Gear position
Wheel sensor
Vehicle speed*
TCM
Powertrain revolution*
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-985
< SYSTEM DESCRIPTION >
[VQ40DE FOR MEXICO]
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When the RESUME/ACCELERATE switch is pressed after canceling operation other than depressing the
MAIN switch, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.
• Brake pedal is released
• Selector lever position is in other than P and N
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)
Component Description
INFOID:0000000009481685
ASCD STEERING SWITCH
.
BRAKE PEDAL POSITION SWITCH
.
STOP LAMP SWITCH
,
ELECTRIC THROTTLE CONTROL ACTUATOR
,
.
ASCD INDICATOR
.
EC-986
< SYSTEM DESCRIPTION >
[VQ40DE FOR MEXICO]
CAN COMMUNICATION
CAN COMMUNICATION
System Description
INFOID:0000000009481686
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.
LAN-53, "CAN System Specification Chart"
, about CAN communication for detail.
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