2003 NISSAN X-TRAIL FL fuel system

EC-662
[YD]
ENGINE CONTROL SYSTEM
DECELERATION CONTROL
Input/Output Signal Chart
The ECM sends a fuel cut signal to the fuel injector and suction control valve during deceleration for better fuel
efficiency. The ECM determines the time of deceleration according to signals from the accelerator pedal
released position switch and crankshaft position sensor (TDC).
Fuel Injection Timing Control SystemEBS0036H
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 ControlEBS0036I
INPUT / OUTPUT SIGNAL CHART
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)EBS0036J
INPUT/OUTPUT SIGNAL CHART
If the engine speed is above 2,800 rpm with no load (for example, in neutral and engine speed 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 operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed underEC-660, "
Fuel Injection Control Sys-
tem".
Sensor Input Signal to ECM ECM Function Actuator
Accelerator pedal released position switch Accelerator pedal position Fuel injection
control (Decel-
eration control)EDU
Fuel injectors
Crankshaft position sensor (TDC) 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 controlEDU
Fuel injectors Accelerator pedal released position switch Accelerator position
Crankshaft position sensor (TDC) Engine speed

TROUBLE DIAGNOSIS
EC-669
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TROUBLE DIAGNOSISPFP:00004
Trouble Diagnosis IntroductionEBS0036Z
INTRODUCTION
The engine has an ECM to control major systems such as fuel injec-
tion control, fuel injection timing control, glow control system, etc.
The ECM accepts input signals from sensors and instantly actuators.
It is essential that both input and output signals are proper and sta-
ble. At the same time, it is important that there are no problems such
as vacuum leaks, or other problems with the engine.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the problems. A road
test with CONSULT-II or a circuit tester connected should be per-
formed. Follow theEC-670, "
WORK FLOW".
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such problems, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” like the exam-
ple on next page should be used.
Start your diagnosis by looking for “conventional” problems first. This
will help troubleshoot driveability problems on an electronically con-
trolled engine vehicle.
MEF036D
SEF233G
SEF234G

EC-674
[YD]
TROUBLE DIAGNOSIS
5.BLEED AIR FROM FUEL SYSTEM
1. Stop engine.
2. Use priming pump to bleed air from fuel system. Refer toEC-664, "
AIR BLEEDING".
>> GO TO 6.
6.CHECK IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and let it idle.
2. Select “CKPS·RPM (TDC)” in “DATA MONITOR” mode with CONSULT-II.
3. Read idle speed.
OK or NG
OK >>INSPECTION END
NG >> GO TO 7.
7.DRAIN WATER FROM FUEL FILTER
Drain water from fuel filter. Refer toEC-664, "
WATER DRAINING".
>> GO TO 8.
8.CHECK IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and let it idle.
2. Select “CKPS·RPM (TDC)” in “DATA MONITOR” mode with CONSULT-II.
3. Read idle speed.
OK or NG
OK >>INSPECTION END
NG >> GO TO 9.
9.CHECK AIR CLEANER FILTER
Check air cleaner filter for clogging or breaks.
OK or NG
OK >> GO TO 10.
NG >> Replace air cleaner filter.725±25 rpm
SEF817Y
725±25 rpm
SEF817Y

TROUBLE DIAGNOSIS
EC-675
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EC
10.CHECK BATTERY VOLTAGE
Check battery voltage.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK BATTERY
Refer toSC-3, "
BATTERY".
OK or NG
OK >> Check charging system. Refer toSC-12.
NG >> Repair or replace.
12.CHECK COMPRESSION PRESSURE
Check compression pressure. Refer toEM-173, "
CHECKING COMPRESSION PRESSURE".
OK or NG
OK >> GO TO 11.
NG >> Follow the instruction of “CHECKING COMPRESSION PRESSURE”.
13.CHECK IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and let it idle.
2. Select “CKPS·RPM (TDC)” in “DATA MONITOR” mode with CONSULT-II.
3. Read idle speed.
OK or NG
OK >>INSPECTION END
NG >> 1. Replace fuel injector.
2. GO TO 3. Voltage: More than 12.13V
725±25 rpm
SEF817Y

EC-676
[YD]
TROUBLE DIAGNOSIS
Symptom Matrix Chart
EBS0037F
SYSTEM — Basic engine control systemSYMPTOM
Reference page
HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT KNOCK/DETONATION
LACK OF POWER POOR ACCELERATION
HI IDLE
LOW IDLE
NO START (with first firing) NO START (without first firing)
HARD TO START WHEN ENGINE IS COLD HARD TO START WHEN ENGINE IS HOT AT I D L E
DURING DRIVING WHEN DECELERATING
Warranty symptom code AA AB AC AD AE AF
Fuelsupplypump 55555555 55 5 —
Fuelinjector 333 333 3334433EC-727
EDU(Electronicdriveunit) 444 444 4445544EC-754
Glow control system 1 1 1 1 1EC-796
Engine body 3 3 3 3 3 3 3 3 4 4 3EM-102
EGR system33EC-803
Air cleaner and duct33MA-31
Fuel pressure relief valveEC-665
ENGINE CONTROL
Suction control valve circuit 4 4 4 4 4 4 4 4 4 4 4EC-772
Fuelinjectorcircuit 111 111 1111111EC-727
EDUcircuit 222 222 2222222EC-754
Mass air flow sensor circuit 1 1 1EC-706
Engine coolant temperature circuit 1 1 1 1EC-711
Vehicle speed sensor circuit 1EC-744
Accelerator pedal position sensor circuit 1 1 1EC-715
Accelerator pedal released position
switch circuit111111EC-783
Common rail fuel pressure sensor
circuitEC-723
Crankshaft position sensor (TDC)
circuit1111111111EC-734

EC-678
[YD]
TROUBLE DIAGNOSIS
SYSTEM — Basic engine control systemSYMPTOM
Reference page
ROUGH IDLE/HUNTING IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEAT/HIGH ENGINE COOLANT TEMPERATURE EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION ABNORMAL SMOKE COLOR
DEAD BATTERY (UNDER CHARGE) Malfunction indicator illuminates. CanbedetectedbyCONSULT-II?
BLACK SMOKE WHITE SMOKE
Warranty symptom code AG AH AJ AK AL AM AP HA
Fuel supply pump 5 5 5 5 1 1 —
Fuelinjector 33344411EC-727
EDU (Electronic drive unit) 4 4 4 5 5 5 1 1EC-754
Glow system1EC-796
Engine body 3 3 3 3 1 3EM-102
EGR system3EC-803
Air cleaner and duct3MA-31
Fuel pressure relief valveEC-665
ENGINE CONTROL
Suction control valve circuit 4 4 4 4 1 1EC-772
Fuel injector circuit 1 1 1 1 1 1 1 1EC-727
EDU circuit 2 2 2 2 2 2 1 1EC-754
Mass air flow sensor circuit 1 1 1EC-706
Engine coolant temperature circuit 1 1 1 1 1EC-711
Vehicle speed sensor circuit11EC-744
Accelerator pedal position sensor circuit 1 1 1EC-715
Accelerator pedal released position switch
circuit11EC-783
Common rail fuel pressure sensor
circuit11EC-723
Crankshaft position sensor (TDC)
circuit11 11EC-734

TROUBLE DIAGNOSIS
EC-679
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1 - 5: The numbers refer to the order of inspection.
(continued on next page)
ENGINE CONTROL
Camshaft position sensor circuitEC-739
Start signal circuitEC-818
Ignition switch circuitEC-700
Power supply for ECM circuit11EC-700
Cooling fan relay circuit 2EC-761
EGR volume control valve circuit 1EC-803
Glow relay circuit1EC-796
ECM relay (Self-shutoff) circuit1EC-790
ECM,connectorcircuit 22222222222EC-749,EC-
788
Air conditioner relay circuitEC-824
Air conditioner switch circuitEC-824
NATS (Nissan Anti-theft System)1EC-666
SYSTEM — Basic engine control systemSYMPTOM
Reference page
ROUGH IDLE/HUNTING IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEAT/HIGH ENGINE COOLANT TEMPERATURE EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION ABNORMAL SMOKE COLOR DEAD BATTERY (UNDER CHARGE) Malfunction indicator illuminates. Can be detected by CONSULT-II?
BLACK SMOKE WHITE SMOKE
Warranty symptom code AG AH AJ AK AL AM AP HA

EC-692
[YD]
TROUBLE DIAGNOSIS
3. Turn ignition switch ON.
4. Touch “START”.
5. Touch “ENGINE”.
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation Manual.
ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
X: Applicable
SEF995X
PBIB0410E
ItemDIAGNOSTIC TEST MODE
SELF-DIAG
RESULTSDATA MONI-
TO RACTIVE
TEST
ENGINE CONTROL COMPONENT PARTS
INPUTCrankshaft position sensor (TDC)´´
Camshaft position sensor´
Engine coolant temperature sensor´´
Vehicle speed sensor´´
Fuel temperature sensor´´
Accelerator pedal position sensor 1´´
Accelerator pedal position sensor 2´´
Accelerator pedal released position switch´´
Common rail fuel pressure sensor´´
Park/neutral position (PNP) switch´
Mass air flow sensor´´
Battery voltage´´
Power steering oil pressure switch´
Stop lamp switch´
Absolute pressure sensor´´
Fuel injector adjustment resistor´
OUTPUTSuction control valve´´´
Fuel injector´´´
Glow relay´´
Cooling fan relay´´´
EGR volume control valve´´