2003 NISSAN X-TRAIL engine

EC-618
[QR (WITHOUT EURO-OBD)]
INJECTOR CIRCUIT
INJECTOR CIRCUIT
PFP:16600
Component DescriptionEBS00B9L
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 ModeEBS00B9M
Specification data are reference values.
ECM Terminals and Reference ValueEBS00B9N
Specification data are reference values and are measured between each terminal and body ground.
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
lEngine: After warming up
lShift lever: N
lAir conditioner switch: OFF
lNo-loadIdle 2.5 - 3.5 msec
2,000 rpm 2.5 - 3.5 msec
INJ PULSE-B1
lEngine: After warming up
lShift lever: N
lAir conditioner switch: OFF
lNo-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]
lWarm-up condition
lIdle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0529E
PBIB0530E

EC-620
[QR (WITHOUT EURO-OBD)]
INJECTOR CIRCUIT
Diagnostic Procedure
EBS00B9P
1.INSPECTION START
Turn ignition switch to “START”.
Is any cylinder ignited?
Ye s o r N o
Yes >>GOTO2.
No >> GO TO 3.
2.CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
3. Make sure that each circuit produces a momentary engine
speed drop.
Without CONSULT-II
1. Start engine.
2. Listen to each injector operating sound.
Clicking noise should be heard.
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
PBIB0133E
MEC703B

FUEL PUMP CIRCUIT
EC-627
[QR (WITHOUT EURO-OBD)]
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FUEL PUMP CIRCUITPFP:17042
DescriptionEBS00B9W
SYSTEM DESCRIPTION
The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine
startability. If the ECM receives a 180°signal from the camshaft position sensor (PHASE), it knows that the
engine is rotating, and causes the pump to operate. If the 180°signal is not received when the ignition switch
is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving
safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn
controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor ModeEBS00B9X
Specification data are reference values.
ECM Terminals and Reference ValueEBS00B9Y
Specification data are reference values and are measured between each terminal and body ground.
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.
Sensor Input Signal to ECMECM
FunctionActuator
Crankshaft position sensor (POS) Engine speed
Fuel pump
controlFuel pump relay Camshaft position sensor (PHASE) Engine speed and cylinder number
Ignition switch Start signal
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and crankingOperates.
When engine is stopped Stops in 1.5 seconds.
Except as shown aboveSto ps.
PBIB0513E
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
lFor 1 seconds after turning ignition switch ON
lEngine running or crankingON
lExcept above conditions OFF

EC-628
[QR (WITHOUT EURO-OBD)]
FUEL PUMP CIRCUIT
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
29 B/P Fuel pump relay[Ignition switch “ON”]
lFor 1 seconds after turning ignition switch “ON”
[Engine is running]0-1.0V
[Ignition switch “ON”]
lMore than 1 seconds after turning ignition switch
“ON”.BATTERY VOLTAGE
(11 - 14V)

EC-634
[QR (WITHOUT EURO-OBD)]
REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR
PFP:92136
Component DescriptionEBS00BA3
The refrigerant pressure sensor is installed at the liquid tank of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.
ECM Terminals and Reference ValueEBS00BA4
Specification data are reference values and are measured between each terminal and body ground.
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.
PBIB0503E
SEF099X
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
58 B Sensors' ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
65 RSensor's power sup-
ply[Ignition switch “ON”]Approximately 5V
83 R/LRefrigerant pressure
sensor[Engine is running]
lWarm-up condition
lBoth A/C switch and blower switch are “ON”.
(Compressor operates.)1.0 - 4.0V

EC-636
[QR (WITHOUT EURO-OBD)]
REFRIGERANT PRESSURE SENSOR
Diagnostic Procedure
EBS00BA6
1.CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch “ON”.
3. Check voltage between ECM terminal 83 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2.CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn A/C switch and blower switch “OFF”.
2. Stop engine.
3. Disconnect refrigerant pressure sensor harness connector.
4. Turn ignition switch “ON”.
5. Check voltage between refrigerant pressure sensor terminal 3
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E61, F38
lHarness for open or short between ECM and refrigerant pressure sensor
>> Repair harness or connectors. Voltage: 1.0 - 4.0V
PBIB0659E
PBIB0503E
Voltage: Approximately 5V
SEF479Y

REFRIGERANT PRESSURE SENSOR
EC-637
[QR (WITHOUT EURO-OBD)]
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EC
4.CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between refrigerant pressure sensor terminal 1 and engine ground. Refer to
Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E61, F38
lHarness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 83 and refrigerant pressure sensor terminal 2. Refer to
Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E61, F38
lHarness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
OK or NG
OK >> Replace refrigerant pressure sensor.
NG >> Repair or replace.
Removal and InstallationEBS00BA7
REFRIGERANT PRESSURE SENSOR
Refer toATC-123, "REFRIGERANT LINES". Continuity should exist.
Continuity should exist.

EC-638
[QR (WITHOUT EURO-OBD)]
ELECTRICAL LOAD SIGNAL
ELECTRICAL LOAD SIGNAL
PFP:25350
CONSULT-II Reference Value in Data Monitor ModeEBS00BA8
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BA9
Specification data are reference values and are measured between each terminal and body ground.
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.
MONITOR ITEM CONDITION SPECIFICATION
LOAD SIGNAL
lIgnition switch: ONRear window defogger switch is ON
and/or lighting switch is in 2nd.ON
Rear window defogger switch is OFF
and lighting switch is OFF.OFF
HEATER FAN SW
lEngine: After warming up, idle
the engineHeater fan is operating. ON
Heater fan is not operating OFF
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
52 R/WElectrical load signal
(Rear window defog-
ger signal)[Ignition switch "ON"]
lRear window defogger switch is "ON"BATTERY VOLTAGE
(11 - 14V)
[Ignition switch "ON"]
lRear window defogger switch is "OFF"Approximately 0V
53 R/YElectrical load signal
(Headlamp signal)[Ignition switch "ON"]
lLighting switch is "2ND" positionBATTERY VOLTAGE
(11 - 14V)
[Ignition switch "ON"]
lLighting switch is "OFF"Approximately 0V
55 LG/BHeater fan switch sig-
nal[Ignition switch "ON"]
lHeater fan control switch is "ON"Approximately 0V
[Ignition switch "ON"]
lHeater fan control switch is "OFF"Approximately 5V