NISSAN X-TRAIL 2005 Service Repair Manual

ENGINE CONTROL SYSTEM
EC-987
[YD (WITH EURO-OBD)]
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IDLE CONTROL
Input/Output Signal Chart
*: The input signal is sent to the ECM through CAN communication line.
When the ECM determines that the engine speed is at idle, the fuel injection system is adapted for the idle
control. The ECM regulates the amount of fuel injected corresponding to changes in load applied to the engine
to keep engine speed constant. The ECM also provides the system with a fast idle control in response to the
engine coolant temperature signal.
NORMAL CONTROL
Input/Output Signal Chart
The amount of fuel injected under normal driving conditions is deter-
mined according to sensor signals. The crankshaft position sensor
detects engine speed, the accelerator pedal position sensor detects
accelerator pedal position and fuel rail pressure sensor detects fuel
rail pressure. These sensors send signals to the ECM.
The fuel injection data, predetermined by correlation between vari-
ous engine speeds, accelerator pedal positions and fuel rail pres-
sure are stored in the ECM memory, forming a map. The ECM
determines the optimal amount of fuel to be injected using the sen-
sor signals in comparison with the map.
MAXIMUM AMOUNT CONTROL
Input/Output Signal Chart
The maximum injection amount is controlled to an optimum by the engine speed, intake air amount, engine
coolant temperature, and accelerator opening in accordance with the driving conditions.
This prevents the oversupply of the injection amount caused by decreased air density at a high altitude or dur-
ing a system failure.
Sensor Input Signal to ECM ECM Function Actuator
Engine coolant temperature sensor Engine coolant temperature
Fuel injection
control (Idle
control)Fuel injector
Fuel pump Crankshaft position sensor Engine speed
Battery Battery voltage
Accelerator pedal position sensor Accelerator pedal position
Fuel rail pressure sensor Fuel rail pressure
Vehicle speed sensor* Vehicle speed
Air conditioner switch* Air conditioner signal
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor Engine speed
Fuel injection
control (Nor-
mal control)Fuel injector
Fuel pump Accelerator pedal position sensor Accelerator position
Fuel rail pressure sensor Fuel rail pressure
SEF649S
Sensor Input Signal to ECM ECM Function Actuator
Mass air flow sensor Amount of intake air
Fuel injection
control (Maxi-
mum amount
control)Fuel Injector Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor Engine speed
Accelerator pedal position sensor Accelerator pedal position

EC-988
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

DECELERATION CONTROL
Input/Output Signal Chart
The ECM sends a fuel cut signal to the fuel injectors and fuel pump during deceleration for better fuel effi-
ciency. The ECM determines the time of deceleration according to signals from the accelerator pedal position
sensor and crankshaft position sensor.
Fuel Injection Timing Control SystemEBS0116X
DESCRIPTION
The target fuel injection timing in accordance with the engine speed and the fuel injection amount are recorded
as a map in the ECM beforehand. The ECM determines the optimum injection timing using sensor signals
accordance with the map.
Air Conditioning Cut ControlEBS0116Y
INPUT / OUTPUT SIGNAL CHART
*: The input signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
This system improves acceleration when the air conditioner is used.
When the accelerator pedal is fully depressed, the air conditioner is turned off for a few seconds.
When engine coolant temperature becomes excessively high, the air conditioner is turned off. This continues
until the engine coolant temperature returns to normal.
Fuel Cut Control (At No Load & High Engine Speed)EBS0116Z
INPUT/OUTPUT SIGNAL CHART
*: The input signal is sent to the ECM through CAN communication line.
If the engine speed is above 2,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 2,800 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 be operated until the engine speed reaches 1,500 rpm, then fuel cut will
be cancelled.
NOTE:
This function is different from deceleration control listed under EC-986, "
Fuel Injection Control Sys-
tem" .
Sensor Input Signal to ECM ECM Function Actuator
Accelerator pedal position sensor Accelerator pedal position Fuel injection
control (Decel-
eration control)Fuel injector
Fuel pump
Crankshaft position sensor Engine speed
Sensor Input Signal to ECM ECM Function Actuator
Air conditioner switch* Air conditioner ON signal
Air conditioner
cut controlAir conditioner relay Accelerator pedal position sensor Accelerator pedal opening angle
Vehicle speed sensor* Vehicle speed
Engine coolant temperature sensor Engine coolant temperature
Sensor Input Signal to ECM ECM Function Actuator
Vehicle speed sensor* Vehicle speed
Fuel cut control Fuel injector Accelerator pedal position sensor Accelerator pedal position
Crankshaft position sensor Engine speed

ENGINE CONTROL SYSTEM
EC-989
[YD (WITH EURO-OBD)]
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Crankcase Ventilation SystemEBS01170
DESCRIPTION
In this system, blow-by gas is sucked into the air duct after oil separation by oil separator in the rocker cover.
INSPECTION
Ventilation Hose
1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any hose
cannot be freed of obstructions, replace.
CAN CommunicationEBS01171
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.
CAN COMMUNICATION UNIT
Go to CAN system, when selecting your CAN system type from the following table.
PBIB0590E
SEC692
Body typeWagon
Axle 4WD 2WD
EngineYD22DDTi
TransmissionM/T
Brake control ABS ESP ABS ESP
ECM×××
ESP/TCS/ABS control unit××
ABS actuator and electric unit (control unit)××

EC-990
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

×: Applicable
4WD Models Without ESP
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive Steering angle sensor××
4WD control unit××
Combination meter×××× Body typeWagon
Axle 4WD 2WD
EngineYD22DDTi
TransmissionM/T
Brake control ABS ESP ABS ESP
PKIA6458E
Signals ECMABS actuator and
electric unit
(control unit)4WD control unit Combination meter
4WD mode indicator lamp signal T R
4WD warning lamp signalTR
A/C compressor feedback signal T R
ABS warning lamp signal T R
Accelerator pedal position signal T R
Engine coolant temperature signal T R
Engine speed signal T R R
MI signal T R
Parking brake switch signalRT
Stop lamp switch signal T R
Vehicle speed signalTRR
RT
ASCD SET lamp signal T R
ASCD CRUISE lamp signal T R
Stop lamp switch signal T R

ENGINE CONTROL SYSTEM
EC-991
[YD (WITH EURO-OBD)]
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4WD Models With ESP
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive Glow indicator lamp signal T R
A/C switch signal R TSignals ECMABS actuator and
electric unit
(control unit)4WD control unit Combination meter
Signals ECMESP/TCS/ABS
control unitSteering angle
sensor4WD control
unitCombination
meter
4WD mode indicator lamp signalTR
4WD warning lamp signalTR
A/C switch signal RT
ABS warning lamp signal T R
Accelerator pedal position signal T R R
Brake warning lamp signal T R
Engine coolant temperature signal TR
Engine speed signal T R R R
ESP OFF indicator lamp signal T R
Glow indicator lamp signal TR
MI signal TR
Stop lamp switch signal T R
Vehicle speed signalTRR
RT
SLIP indicator lamp signal T R
Parking brake switch signalRT
Steering angle sensor signal R T
ASCD SET lamp signal TR
ASCD CRUISE lamp signal TR
PKIA9634E

EC-992
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

2WD Models Without ESP
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive
SKIA9999E
Signals ECM ABS actuator and electric unit (control unit) Combination meter
A/C compressor feedback signal T R
ABS warning lamp signal T R
Engine coolant temperature signal T R
Engine speed signal T R
MI signal T R
Vehicle speed signalTR
RT
ASCD SET lamp signal T R
ASCD CRUISE lamp signal T R
Stop lamp switch signal T R
Glow indicator lamp signal T R
A/C switch signal R T

ENGINE CONTROL SYSTEM
EC-993
[YD (WITH EURO-OBD)]
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2WD Models With ESP
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive
PKIC0343E
Signals ECM ESP/TCS/ABS control unit Steering angle sensor Combination meter
A/C switch signal RT
ABS warning lamp signal T R
Accelerator pedal position signal T R
Brake warning lamp signal T R
Engine coolant temperature signal TR
Engine speed signal T R R
ESP OFF indicator lamp signal T R
Glow indicator lamp signal TR
MI signal TR
Vehicle speed signalTR
RT
SLIP indicator lamp signal T R
Steering angle sensor signal R T
ASCD SET lamp signal TR
ASCD CRUISE lamp signal TR

EC-994
[YD (WITH EURO-OBD)]
BASIC SERVICE PROCEDURE

BASIC SERVICE PROCEDUREPFP:00018
Fuel FilterEBS01172
DESCRIPTION
A water draining cock is on the lower side and a priming pump for bleeding air is on the upper side.
AIR BLEEDING
Pump the priming pump to bleed air.

When air is bled completely, the pumping of the priming pump
suddenly becomes heavy. Stop the operation at that time.

If it is difficult to bleed air by the pumping of the priming pump
(the pumping of the priming pump does not become heavy), dis-
connect the fuel supply hose between the fuel filter and the fuel
gallery. Then, perform the operation described above, and make
sure that fuel comes out. (Use a pan, etc. so as not to spill fuel.
Do not let fuel get on engine and other parts.) After that, connect
the hose, then bleed air again.

Start engine and let it idle for at least 1 minute after performing
air bleeding.
WATER DRAINING
1. Remove the fuel filter, filter bracket, protector assembly from the dash panel as follows.
a. Remove the air cleaner case (upper), air duct assembly, and vacuum hose for brake booster (between the
vacuum pump and vacuum pipe).
CAUTION:
After the duct is removed, cover the opening with gum tape, etc. to prevent foreign object from
getting into the engine during the operation.
b. Remove the mounting nuts on the dash panel, then remove the fuel filter, filter bracket, and protector
assembly from the dash panel.

It is not necessary to disconnect the fuel hose.
2. Using a tool such as a pliers, loosen the water draining cock at
the bottom of the fuel filter.
Loosening drain cock four to five turns causes water to
start draining.
Do not remove drain cock by loosening it excessively.
If water dose not drain properly, move the priming up and down.
CAUTION:
When the water is drained, the fuel is also drained. Use a
pan, etc. to avoid fuel adherence to the rubber parts such as
the engine mount insulator.
Do not over-tighten the water draining cock. This will dam-
age the cock thread, resulting in water or fuel leak.
3. Bleed air of the fuel filter. Refer to EC-994, "
AIR BLEEDING" .
4. Start the engine.
Fuel Pump Learning Value ClearingEBS01173
DESCRIPTION
In order to always keep optimum fuel pressure in fuel rail, the ECM controls fuel pump in high precision with
monitoring the signal of fuel rail pressure sensor.
Accordingly, the ECM always learns characteristic value of fuel pump. Fuel Pump Learning Value Clearing is
an operating to clear the value of the fuel pump learning.
It must be performed after the fuel pump is changed. When the ECM is replaced with brand new one, the Fuel
Pump Learning Value Clearing is not necessary to be performed. If the ECM to be replaced has the possibility
of learning the characteristic value of fuel pump, the Fuel Pump Learning Value Clearing is necessary to be
performed after the ECM has been replaced.
OPERATION PROCEDURE
NOTE:
When removing fuel pump, perform Fuel Pump Learning Value Clearing before starting engine.
PBIB1932E
SMA825B

BASIC SERVICE PROCEDURE
EC-995
[YD (WITH EURO-OBD)]
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1. Turn ignition switch ON.
2. Select “PUMP LEARNT CLEAR” in “ACTIVE TEST” mode with
CONSULT-II.
3. Touch “CLEAR” and wait a few seconds.
4. Make sure that “CMPLT” is displayed on CONSULT-II screen.
MBIB0896E
MBIB0893E
MBIB0894E

EC-996
[YD (WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionEBS011UJ
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
*: When DTC and 1st/2nd trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator (MI) on the instrument panel lights up when the same malfunction is detected in
three consecutive trips (Three trip detection logic).
Three Trip Detection Logic and One Trip Detection LogicEBS011UK
On board diagnosis (OBD) system of this vehicle has “Three Trip Detection Logic” and “One Trip Detection
Logic”. For which logic each self-diagnosis corresponds with, refer to EC-973, "
INDEX FOR DTC" .
“Trip” of “Three Trip Detection Logic” means a driving mode in which the self-diagnosis is performed while
driving.
THREE TRIP DETECTION LOGIC
When a malfunction is detected for the first time, 1st trip DTC is stored in the ECM memory. MI does not illumi-
nate at this stage. <1st trip>
When the same malfunction is detected again during the next driving, 2nd trip DTC is stored in the ECM mem-
ory and 1st trip DTC is cleared from the ECM memory. MI does not illuminate at this stage. <2nd trip>
When the same malfunction is detected again at the third driving, DTC and Freeze Frame Data are stored in
the ECM memory and 2nd trip DTC is cleared from the ECM memory. MI illuminates at the same time when
DTC is stored. <3rd trip>
In other words, DTC and Freeze Frame Data are stored and MI illuminates when the same malfunction occurs
in 3 consecutive trips.
This is called “Three Trip Detection Logic”.
ONE TRIP DETECTION LOGIC
When a malfunction is detected for the first time, DTC and Freeze Frame Data are stored in the ECM memory
and MI lights up. This is called “One Trip Detection Logic”. Some self-diagnoses will not illuminate MI when
DTC is stored. (Refer to EC-996, "
Emission-related Diagnostic Information" .) 1st/2nd trip DTC is not stored for
one trip detection logic.
Emission-related Diagnostic InformationEBS011UL
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
X: Applicable —: Not applicable Emission-related diagnostic information ISO Standard
Diagnostic Trouble Code (DTC) Service $03 of ISO 15031-5
Freeze Frame data Service $02 of ISO 15031-5
1st/2nd Trip Diagnostic Trouble Code (1st/2nd Trip DTC) Service $07 of ISO 15031-5
Calibration ID Service $09 of ISO 15031-5
DTC 1st trip DTC 2nd trip DTC Freeze Frame data
CONSULT-II××××
GST××××
ECM××*×*—
Items
(CONSULT-II screen item) DTC*
11st/2nd trip
DTCMI lighting
upReference page
CONSULT-II
GST*
2ECM*3
CAN COMM CIRCUIT U1000 1000 — —EC-1056
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000—— —
CMP/CKP RELATION P0016 0016××EC-1059