Nissan Sentra. Manual — part 338
EC-48
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
When IPDM E/R recieves a cooling fan speed request signal, IPDM E/R controls the cooling fan ralay 1, 2 and
3.
STARTER MOTOR DRIVE CONTROL
STARTER MOTOR DRIVE CONTROL : System Description
INFOID:0000000009758372
SYSTEN DIAGRAM
JSBIA2662GB
Cooling fan speed
Cooling fan relay
Cooling fan relay 1
Cooling fan relay 2
Cooling fan relay 3
OFF
OFF
OFF
OFF
LOW
ON
OFF
OFF
HIGH
ON
ON
ON
SYSTEM
EC-49
< SYSTEM DESCRIPTION >
[MRA8DE]
C
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EC
N
P
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INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
When rapid deceleration occurs during engine runs or idle speed decreases due to heavy load conditions,
ECM detects a decrease in idle speed and restarts the engine to secure reliability in handleability by transmit-
ting a cranking request signal to IPDM E/R for activating the starter motor under the following conditions:
• Selector lever: Other than P and N (CVT models)
• Shifter lever: Other than neutral position (M/T models)
• Idle switch: ON (Accelerator pedal not depressed)
• Brake switch: ON (Brake pedal depressed)
ECM transmits a control signal to IPDM E/R via BCM by CAN communication.
IPDM E/R detects an operating state of the starter motor relay and the starter motor control relay and trans-
mits a feed back signal to ECM via CAN Communication.
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM : System Description
INFOID:0000000009758373
SYSTEM DIAGRAM
*1: CVT models
*2: M/T models
JSBIA2815GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
• Engine speed
• Piston position
Starter motor
drive control
• BCM
• IPDM E/R
(Starter relay & start-
er control relay)
Camshaft position sensor (PHASE)
Engine coolant temperature sensor
Engine coolant temperature
Accelerator pedal position sensor
Accelerator pedal position
Transmission range switch (CVT)
Gear position
Park/ Neutral position switch (M/T)
Gear position
Stop lamp switch
Brake pedal position
Combination meter
CAN commu-
nication
Vehicle speed signal
EC-50
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
INPUT/OUTPUT SIGNAL CHART
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
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.
JSBIA0322GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed
*
EVAP canister
purge flow control
EVAP canister purge vol-
ume control solenoid valve
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Battery
Battery voltage
*
Combination meter
CAN commu-
nication
Vehicle speed signal
PBIB1631E
SYSTEM
EC-51
< SYSTEM DESCRIPTION >
[MRA8DE]
C
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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.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description
INFOID:0000000009758374
SYSTEM DIAGRAM
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.
The ASCD operation status is indicated on the combination meter. If any malfunction occurs in ASCD system,
ECM automatically deactivates the ASCD control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (CRUISE is indicated on the combination meter.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch.
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
• More than 2 switches at ASCD steering 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
• TCS system is operated
JPBIA3210GB
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