Infiniti G37 Coupe. Manual — part 472
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-69
< FUNCTION DIAGNOSIS >
[VQ37VHR]
C
D
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F
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H
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A
EC
N
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O
: Vehicle front
1.
Power steering pressure sensor
2.
Alternator
3.
Engine oil temperature sensor
: Vehicle front
1.
EVAP service port
2.
EVAP canister purge volume control
solenoid valve
3.
EVAP canister
4.
EVAP canister vent control valve
5.
EVAP control system pressure sen-
sor
: Vehicle front
1.
Fuel level sensor unit and fuel pump
harness connector
2.
Fuel level sensor unit and fuel pump 3.
Fuel pressure regulator
4.
Fuel tank temperature sensor
1.
Accelerator pedal position sensor
2.
ECM
JMBIA0845ZZ
JMBIA0019ZZ
JMBIA0015ZZ
EC-70
< FUNCTION DIAGNOSIS >
[VQ37VHR]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Component Description
INFOID:0000000001733946
1.
ICC steering switch
2.
CANCEL switch
3.
RESUME/ACCELERATE switch
4.
SET/COAST switch
5.
DISTANCE switch
6.
MAIN switch
1.
ASCD steering switch
2.
CANCEL switch
3.
RESUME/ACCELERATE switch
4.
SET/COAST switch
5.
MAIN switch
1.
Stop lamp switch
2.
ASCD brake switch (ASCD models)
ICC brake switch (ICC models)
3.
Brake pedal
4.
ASCD clutch switch (ASCD models)
ICC clutch switch (ICC models)
5.
Clutch pedal
JMBIA0016ZZ
JMBIA0017ZZ
JMBIA0051ZZ
Component
Reference
ASCD steering switch
ASCD brake switch
Stop lamp switch
Electric throttle control actuator
ASCD indicator
CAN COMMUNICATION
EC-71
< FUNCTION DIAGNOSIS >
[VQ37VHR]
C
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EC
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CAN COMMUNICATION
System Description
INFOID:0000000001733947
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-8, "CAN Communication Control Circuit"
, about CAN communication for detail..
EC-72
< FUNCTION DIAGNOSIS >
[VQ37VHR]
COOLING FAN CONTROL
COOLING FAN CONTROL
System Diagram
INFOID:0000000001733948
System Description
INFOID:0000000001733949
INPUT/OUTPUT SIGNAL CHART
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.
SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, air conditioner
ON signal, refrigerant pressure, target A/C evaporator temperature and A/C evaporator temperature.
Cooling fan control signal is sent to IPDM E/R from ECM by CAN communication line. Then, IPDM E/R sends
ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty signal,
cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan speed
is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.
JMBIA0075GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
1
Cooling fan
control
IPDM E/R
↓
Cooling fan control module
↓
Cooling fan motor
Engine coolant temperature sensor
Engine coolant temperature
Refrigerant pressure sensor
Refrigerant pressure
Battery
Battery voltage*
1
Unified meter and A/C amp.
Vehicle speed*
2
Air conditioner ON signal*
2
A/C evaporator temperature*
2
Target A/C evaporator temperature*
2
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