2003 NISSAN X-TRAIL Electronic Repair Manual

reset oil type glove box radio headlights air suspension

Load previous 8 pages

Page 1497 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual PRECAUTIONS
EC-383
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
lAfter performing each TROUBLE DIAGNOSIS, perform
“DTC Confirmation Procedure” or “Overall Function
Check”.
The DTC should

Page 1498 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-384
[QR (WITHOUT EURO-OBD)]
PRECAUTIONS
lDo not depress accelerator pedal when starting.
lImmediately after starting, do not rev up engine unneces-
sarily.
lDo not rev up engine just prior to shutd

Page 1499 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual PREPARATION
EC-385
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
PREPARATIONPFP:00002
Special Service ToolsEBS00BEP
The actual shapes of Kent-Moore tools may differ from those of special service t

Page 1500 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-386
[QR (WITHOUT EURO-OBD)]
PREPARATION
Oxygen sensor
thread cleanerReconditioning the exhaust system threads
before installing a new oxygen sensor. Use with
anti-seize lubricant shown below.
a: 18

Page 1501 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ENGINE CONTROL SYSTEM
EC-387
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
ENGINE CONTROL SYSTEMPFP:23710
System DiagramEBS00BER
PBIB0488E

Page 1502 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-388
[QR (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
Vacuum Hose Drawing
EBS00BES
Refer toEC-387, "System Diagram"for Vacuum Control System.
PBIB0489E

Page 1503 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ENGINE CONTROL SYSTEM
EC-389
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
System ChartEBS00BET
*1: This sensor is not used to control the engine system under normal conditions.
*2: These signals

ENGINE CONTROL SYSTEM
EC-389
[QR (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
System ChartEBS00BET
*1: This sensor is not used to control the engine system under normal conditions.
*2: These signals are sent to the ECM through CAN communication line.
Multiport Fuel Injection (MFI) SystemEBS00BEU
INPUT/OUTPUT SIGNAL CHART
*1: Under normal conditions, this sensor is not for engine control operation.
*2: This signal is sent to the ECM through CAN communication line.Input (Sensor) ECM Function Output (Actuator)
lCamshaft position sensor (PHASE)
lCrankshaft position sensor (POS)
lMass air flow sensor
lEngine coolant temperature sensor
lHeated oxygen sensor 1
lThrottle position sensor
lAccelerator pedal position sensor
lPark/neutral position (PNP) switch
lIntake air temperature sensor
lPower steering pressure sensor
lIgnition switch
lBattery voltage
lKnock sensor
lRefrigerant pressure sensor
lHeated oxygen sensor 2 *1
lTCM (Transmission control module) *2
lESP/TCS/ABS control unit *2
lWheel sensor
lAir conditioner switch
lElectrical loadFuel injection & mixture ratio control Fuel injectors
Electronic ignition system Power transistors
Fuel pump control Fuel pump relay
On board diagnostic system MI (On the instrument panel)
Heated oxygen sensor 1 heater control Heated oxygen sensor 1 heater
Heated oxygen sensor 2 heater control Heated oxygen sensor 2 heater
EVAP canister purge flow controlEVAP canister purge volume control
solenoid valve
Air conditioning cut control Air conditioner relay
Cooling fan control Cooling fan relays
Sensor Input Signal to ECMECM
functionActuator
Crankshaft position sensor (POS)
Engine speed
Piston position
Fuel injec-
tion & mix-
ture ratio
controlFuel injectors Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Ignition switch Start signal
Knock sensor Engine knocking condition
Battery Battery voltage
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2 *1 Density of oxygen in exhaust gas
ESP/TCS/ABS control unit *2 ESP/TCS operation command
Wheel sensor Vehicle speed
Air conditioner switch Air conditioner operation

Page 1504 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-390
[QR (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
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 remai

EC-390
[QR (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
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.

lDuring warm-up
lWhen starting the engine
lDuring acceleration
lHot-engine operation
lWhen selector lever is changed from “N” to “D”
lHigh-load, high-speed operation

lDuring deceleration
lDuring high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses
heated oxygen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM
adjusts the injection pulse width according to the sensor voltage signal. For more information about heated
oxygen sensor 1, refer toEC-490
. This maintains the mixture ratio within the range of stoichiometric (ideal air-
fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of heated oxygen sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal
from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
lDeceleration and acceleration
lHigh-load, high-speed operation
lMalfunction of heated oxygen sensor 1 or its circuit
lInsufficient activation of heated oxygen sensor 1 at low engine coolant temperature
lHigh engine coolant temperature
lDuring warm-up
lAfter shifting from “N” to “D”
lWhen starting the engine
PBIB0121E

Load next 8 pages

Page: < prev 1-10 ... 1465-1472 1473-1480 1481-1488 1489-1496 1497-1504 1505-1512 1513-1520 1521-1528 1529-1536 ... 3072 next >

climate control jump cable dead battery open trunk change time window transmission oil