Nissan Frontier D40. Manual — part 335
ENGINE CONTROL SYSTEM
EC-31
< FUNCTION DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
BBIA0611E
EC-32
< FUNCTION DIAGNOSIS >
[QR25DE]
ENGINE CONTROL SYSTEM
ALBIA0515ZZ
1.
EVAP canister vent control valve
(view with bed removed)
2.
EVAP control system pressure
sensor
3.
Drain filter
4.
EVAP canister
5.
Intake manifold collector
(view with air cleaner case removed)
6.
Power steering pressure sensor
7.
ASCD brake switch (view with lower
instrument panel LH removed)
8.
Stop lamp switch
9.
Brake pedal
10.
Electric throttle control actuator
(view with intake air duct removed)
11.
Throttle valve
12. ASCD steering switch
13. CANCEL switch
14. ON OFF (main) switch
15. SET/COAST switch
16. ACCEL/RES switch
17. ASCD clutch switch
18. Clutch pedal
Front
ENGINE CONTROL SYSTEM
EC-33
< FUNCTION DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
BBIA0640E
EC-34
< FUNCTION DIAGNOSIS >
[QR25DE]
MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM
System Description
INFOID:0000000005273028
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signal of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.
<Fuel increase>
• During warm-up
• When starting the engine
• During acceleration
• Hot-engine operation
• When selector lever is changed from N to D (A/T models)
• High-load, high-speed operation
<Fuel decrease>
• During deceleration
• During high engine speed operation
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
3
Fuel injection & mixture
ratio control
Fuel injector
Camshaft position sensor (PHASE)
Piston position
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
Park/neutral position (PNP) switch (M/T)
TCM (A/T)
Gear position
Knock sensor
Engine knocking condition
Power steering pressure sensor
Power steering operation
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
Heated oxygen sensor 2*
1
Density of oxygen in exhaust gas
Combination meter
Vehicle speed*
2
Air conditioner switch
Air conditioner operation*
2
Battery
Battery voltage*
3
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