Nissan Pathfinder (2010 year). Manual — part 304
EC-524
< FUNCTION DIAGNOSIS >
[VK56DE]
MULTIPORT FUEL INJECTION SYSTEM
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the ignition order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all 8 cylinders twice each engine cycle. In other words, pulse signals of the
same width are simultaneously transmitted from the ECM.
The 8 fuel injectors will then receive the signals 2 times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speed.
PBIB0122E
2010 Pathfinder
ELECTRIC IGNITION SYSTEM
EC-525
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
ELECTRIC IGNITION SYSTEM
System Description
INFOID:0000000005257500
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
Ignition order: 1 - 8 - 7 - 3 - 6 - 5 - 4 -2
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Comput-
ing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
2
Piston position
Ignition timing
control
Power transistor
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Knock sensor
Engine knocking
Battery
Battery voltage*
2
Unified meter control unit
Gear position
Vehicle speed*
1
2010 Pathfinder
EC-526
< FUNCTION DIAGNOSIS >
[VK56DE]
AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL
Input/Output Signal Chart
INFOID:0000000005257501
*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:0000000005257502
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
Unified meter control unit
Vehicle speed*
1
2010 Pathfinder
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-527
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
INFOID:0000000005257503
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the 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 indicator and SET indicator on combination meter. If any
malfunction occurs in ASCD system, CRUISE indicator blinks and ASCD control is deactivated.
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 on 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 on 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 at 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, R position
• 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 CRUISE indicator.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE indicator may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE indicator 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 indicator 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
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
Unified meter control unit
Gear position
Vehicle speed*
TCM
Powertrain revolution*
2010 Pathfinder
EC-528
< FUNCTION DIAGNOSIS >
[VK56DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
When the RESUME/ACCELERATE switch is pressed after canceling operation other than pressing 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
• A/T selector lever position is 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:0000000005257504
ASCD STEERING SWITCH
EC-823, "Component Description"
ASCD BRAKE SWITCH
EC-827, "Component Description"
STOP LAMP SWITCH
.
ELECTRIC THROTTLE CONTROL ACTUATOR
.
ASCD INDICATOR
EC-870, "Component Description"
2010 Pathfinder
CAN COMMUNICATION
EC-529
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
CAN COMMUNICATION
System Description
INFOID:0000000005257505
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 Communication Signal Chart"
, about CAN communication for detail.
2010 Pathfinder
EC-530
< FUNCTION DIAGNOSIS >
[VK56DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
Description
INFOID:0000000005257506
SYSTEM DESCRIPTION
Cooling Fan Control
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM via the CAN communication line.
The ECM controls the cooling fan speed corresponding to the vehicle speed, engine coolant temperature,
refrigerant pressure and air conditioner ON signal. The control system has a 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.
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 relays)
Battery
Battery voltage*
1
Unified meter control unit
Vehicle speed*
2
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner ON signal*
2
Refrigerant pressure sensor
Refrigerant pressure
JMBIA0700GB
Cooling fan speed
Cooling fan relay
LO
HI
Stop (OFF)
OFF
OFF
Low (LOW)
ON
OFF
High (HI)
ON
ON
2010 Pathfinder
EVAPORATIVE EMISSION SYSTEM
EC-531
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
EVAPORATIVE EMISSION SYSTEM
Description
INFOID:0000000005257507
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.
PBIB3639E
2010 Pathfinder
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст