2001 NISSAN X-TRAIL length

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-793
[QR20(WITH EURO-OBD)]
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EC
codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to read a
code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0000” refers to no
malfunction. (See EC-753, "
INDEX FOR DTC" )
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
791, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .
●If the battery is disconnected, the DTC will be lost from the backup memory after approx 24 hours.
●Be careful not to erase the stored memory before starting trouble diagnoses.
DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR
In this mode, the MI displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.
*: Maintains conditions just before switching to open loop.
To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the MI
comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.
OBD System Operation ChartEBS00MSQ
RELATIONSHIP BETWEEN MI, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
●When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
●When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MI will come on. For details, refer to EC-777, "
Two Trip Detection
Logic" .
SEF952W
MI Fuel mixture condition in the exhaust gas Air-fuel ratio feedback control condition
ON Lean
Closed loop system
OFF Rich
*Remains ON or OFF Any condition Open loop system

INJECTOR CIRCUIT
EC-1083
[QR20(WITH EURO-OBD)]
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EC
INJECTOR CIRCUITPFP:16600
Component DescriptionEBS00N1X
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the needle valve back and allows
fuel to flow through the injector into the intake manifold. The amount
of fuel injected depends upon the injection pulse duration. Pulse
duration is the length of time the injector remains open. The ECM
controls the injection pulse duration based on engine fuel needs.
CONSULT-II Reference Value in Data Monitor ModeEBS00N1Y
Specification data are reference values.
ECM Terminals and Reference ValueEBS00N1Z
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
SEF375Z
MONITOR ITEM CONDITION SPECIFICATION
B/FUEL SCHDL
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 2.5 - 3.5 msec
2,000 rpm 2.5 - 3.5 msec
INJ PULSE-B1
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
101
102
103
104R/B
Y/B
G/B
L/BInjector No. 1
Injector No. 2
Injector No. 3
Injector No. 4[Engine is running]
●Warm-up condition
●Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●Warm-up condition
●Engine speed is 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0529E
PBIB0530E

EC-1130
[QR20(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.

●During warm-up
●When starting the engine
●During acceleration
●Hot-engine operation
●When selector lever is changed from “N” to “D”
●High-load, high-speed operation

●During deceleration
●During 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 to EC-1229
. 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.
●Deceleration and acceleration
●High-load, high-speed operation
●Malfunction of heated oxygen sensor 1 or its circuit
●Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature
●High engine coolant temperature
●During warm-up
●After shifting from “N” to “D”
●When starting the engine
PBIB0121E

EC-1146
[QR20(WITHOUT EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
nates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are dis-
played, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified
codes can be identified by using the CONSULT-II. A DTC will be used as an example for how to read a code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0000” refers to no
malfunction. (See E C - 111 9 , "
INDEX FOR DTC" )
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
1145, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .
●If the battery is disconnected, the DTC will be lost from the backup memory after approx 24 hours.
●Be careful not to erase the stored memory before starting trouble diagnoses.
DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR
In this mode, the MI displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.
*: Maintains conditions just before switching to open loop.
To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the MI
comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.
SEF952W
MI Fuel mixture condition in the exhaust gas Air-fuel ratio feedback control condition
ON Lean
Closed loop system
OFF Rich
*Remains ON or OFF Any condition Open loop system

INJECTOR CIRCUIT
EC-1357
[QR20(WITHOUT EURO-OBD)]
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EC
INJECTOR CIRCUITPFP:16600
Component DescriptionEBS00NA4
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the needle valve back and allows
fuel to flow through the injector into the intake manifold. The amount
of fuel injected depends upon the injection pulse duration. Pulse
duration is the length of time the injector remains open. The ECM
controls the injection pulse duration based on engine fuel needs.
CONSULT-II Reference Value in Data Monitor ModeEBS00NA5
Specification data are reference values.
ECM Terminals and Reference ValueEBS00NA6
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
SEF375Z
MONITOR ITEM CONDITION SPECIFICATION
B/FUEL SCHDL
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 2.5 - 3.5 msec
2,000 rpm 2.5 - 3.5 msec
INJ PULSE-B1
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
101
102
103
104R/B
Y/B
G/B
L/BInjector No. 1
Injector No. 2
Injector No. 3
Injector No. 4[Engine is running]
●Warm-up condition
●Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●Warm-up condition
●Engine speed is 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0529E
PBIB0530E

EC-1472
[YD]
DTC P0201 - P0204 FUEL INJECTOR
DTC P0201 - P0204 FUEL INJECTOR
PFP:16600
DescriptionEBS008X0
The ECM sends the fuel injection signal to EDU (Electronic Drive Unit). Then the EDU sends ON signals to
fuel injectors to operate them.
The EDU monitors injector ground circuit and sends the feedback signal to the ECM.
COMPONENT DESCRIPTION
The fuel injector is a small, precise solenoid valve. When fuel injec-
tor receives ON signal from EDU, the coil in the fuel injector is ener-
gized. The energized coil pulls the needle valve back and allows fuel
to flow through the fuel injector into the cylinder. The amount of fuel
injected depends upon the injection pulse duration. Pulse duration is
the length of time the fuel injector remains open. The ECM controls
the injection pulse duration based on engine fuel needs.
CONSULT-II Reference Value in Data Monitor ModeEBS008X1
Remarks: Specification data are reference values.
ECM Terminals and Reference ValueEBS008X2
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
PBIB0482E
PBIB0465E
MONITOR ITEM CONDITION SPECIFICATION
MAIN INJ WID
●Engine: After warming up
●Shift lever: Neutral position
●Idle speedNo-load 0.68 - 0.78 msec
Air conditioner switch: ON
Rear window defogger switch: ON0.78 - 0.88 msec

FL-10
[QR]
FUEL TANK
7. Remove exhaust center tube and insulator. Refer to EX-2, "EXHAUST SYSTEM" .
8. Remove propeller shaft. Refer to PR-2, "
REAR PROPELLER SHAFT" .
9. Using a transmission jack, support the bottom of the rear final
drive.
10. Remove the mounting nuts on the rear suspension member, and
lower the transmission jack carefully until just before the rear
suspension member is removed from the stud bolts on the vehi-
cle.
11. Disconnect fuel filler hose, EVAP hose and vent hose at fuel
tank side.
12. For disconnection procedure of the quick connector on the
evaporator hose, Refer to FL-4, "
FUEL LEVEL SENSOR UNIT,
FUEL FILTER AND FUEL PUMP ASSEMBLY" .
13. Remove fuel tank protector.
14. Remove fuel tank band mounting bolts while supporting fuel
tank.
15. Remove fuel tank.
INSTALLATION
Install in the reverse order of removal paying attention to the following.
●Surely clamp fuel hoses and insert hose to the length below.
●Be sure hose clamp is not placed on swelled area of fuel tube.
●Tighten fuel hose clamp so that the distance between its lugs becomes to the following.
●Push the mounting band pin to the vehicle side securely.
●Before fixing the fuel tank, temporarily install the filler tube.
CAUTION:
Use genuine fuel filler tube mounting bolts or equivalent. Make sure to tighten them to the speci-
fied torque.
●To connect the quick connector, refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL
PUMP ASSEMBLY" .
KBIA0285E
KBIA0286E
KBIA0290E
Fuel filler hose : 35mm (1.38 in)
The other hoses : 25mm (0.98 in)
Fuel tank side : 5 - 9 mm (0.20 - 0.35 in)
Fuel filler tube side : 7 - 11 mm (0.28 - 0.43 in)

FL-22
[YD22DDTi]
FUEL TANK
10. Using a transmission jack, support the bottom of the rear final
drive.
11. Remove the mounting nuts on the rear suspension member, and
lower the transmission jack carefully until just before the rear
suspension member is removed from the stud bolts on the vehi-
cle.
12. Disconnect fuel filler hose, EVAP hose and vent hose at fuel
tank side.
For disconnection procedure of the quick connector. Refer to
FL-17, "
FUEL LEVEL SENSOR UNIT" .
13. Remove fuel tank protector.
14. Remove fuel tank band mounting bolts while supporting fuel
tank.
15. Remove fuel tank.
INSTALLATION
●Install in the reverse order of removal paying attention to the following.
●Surely clamp fuel hoses and insert hose to the length below.
●Be sure hose clamp is not positioned on swelled area of fuel tube.
●Tighten fuel hose clamp so that the distance between its lugs becomes to the following.
●Push the mounting band pin to the vehicle side securely.
●Before fixing the fuel tank, temporarily install the fuel filler tube.
CAUTION:
Use genuine fuel filler tube mounting bolts or equivalent. Make sure to tighten them to the speci-
fied torque.
●To connect the quick connector. Refer to FL-17, "FUEL LEVEL SENSOR UNIT" .
INSPECTION AFTER INSTALLATION
Make sure there is no fuel leakage at connections in the following steps.
KBIA0285E
KBIA0286E
KBIA0290E
Fuel filler hose : 35 mm (1.38 in)
The other hose : 25 mm (0.98 in)
Fuel tank side : 5 - 9 mm (0.20 - 0.35 in)
Fuel filler tube side : 7 - 11 mm (0.28 - 0.43 in)