Nissan Almera Tino V10. Instruction — part 436
EC-570
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot film) and characteristic changes
during operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN compared
to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an
increase in fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
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 firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two 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 or operation of the engine at excessively high speeds.
Electronic Ignition (EI) System
EBS00QUS
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SEF337W
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
*2
and piston position
Ignition timing control
Power transistor
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
Park/neutral position (PNP) switch
Gear position
Battery
Battery voltage
*2
Vehicle speed signal
*1
Vehicle speed
ENGINE CONTROL SYSTEM
EC-571
[QG (WITHOUT EURO-OBD)]
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SYSTEM DESCRIPTION
The ignition timing is controlled by the ECM to maintain the best air-
fuel ratio for every running condition of the engine. The ignition tim-
ing data is stored in the ECM. This data forms the map shown.
The ECM receives information such as the injection pulse width and
camshaft position sensor signal. Computing this information, ignition
signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
A
°
BTDC
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.
Air Conditioning Cut Control
EBS00QUT
INPUT/OUTPUT SIGNAL CHART
*1: These signals are sent to the ECM through CAN communication line.
*2: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
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.
SEF742M
Sensor
Input Signal to ECM
ECM function
Actuator
Air conditioner switch
*1
Air conditioner “ON” signal
Air conditioner
cut control
Air conditioner relay
Throttle position sensor
Throttle valve opening angle
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
Vehicle speed signal
*1
Vehicle speed
EC-572
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
Fuel Cut Control (at No Load and High Engine Speed)
EBS00QUU
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 3,950 rpm with no load (for example, in neutral and engine speed over 3,950
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under “Multiport Fuel Injection (MFI) System”,
.
CAN Communication
EBS00QUV
SYSTEM DESCRIPTION
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.
A/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
Sensor
Input Signal to ECM
ECM function
Actuator
Park/neutral position (PNP) switch
Neutral position
Fuel cut control
Fuel injectors
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Engine coolant temperature sensor
Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Vehicle speed signal
*1
Vehicle speed
YEL468E
Signals
ECM
TCM
ABS actuator
and electric
unit (control
unit)
Smart entrance
control unit
Combination
meter
Engine speed signal
T
R
Brake switch signal
R
T
Rear window defogger signal
R
T
Heater fan switch signal
R
T
Air conditioner switch signal
R
T
MI signal
T
R
ENGINE CONTROL SYSTEM
EC-573
[QG (WITHOUT EURO-OBD)]
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M/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
Engine coolant temperature signal
T
R
Fuel consumption signal
T
R
Vehicle speed signal
T
R
R
T
Seat belt reminder signal
R
T
Headlamp switch signal
T
R
Flashing indicator signal
T
R
Engine cooling fan speed signal
T
R
Door switches state signal
T
R
A/C compressor signal
T
R
A/C compressor feedback signal
T
R
Accelerator pedal position signal
T
R
Output shaft revolution signal
R
T
ABS operation signal
T
R
OD OFF switch signal
R
T
OD OFF indicator signal
T
R
A/T self-diagnosis signal
R
T
ABS warning lamp signal
T
R
N range switch signal
R
T
P range switch signal
R
T
Signals
ECM
TCM
ABS actuator
and electric
unit (control
unit)
Smart entrance
control unit
Combination
meter
YEL469E
Signals
ECM
ABS actuator and
electric unit (con-
trol unit)
Smart entrance
control unit
Combination meter
Engine speed signal
T
R
Rear window defogger signal
R
T
Heater fan switch signal
R
T
Air conditioner switch signal
R
T
MI signal
T
R
Engine coolant temperature signal
T
R
Fuel consumption signal
T
R
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