2003 NISSAN X-TRAIL engine coolant

EC-686
[YD]
TROUBLE DIAGNOSIS
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A1
A2
A3
A4L/W
Y/PU
PU
YEDU drive No. 2
EDU drive No. 4
EDU drive No. 3
EDU drive No. 1[Engine is running]
lWarm-up condition
lIdle speed0-4V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm0-4V
A5
A6
A7B
B
BECM ground[Engine is running]
lIdle speedApproximately 0V
A8
A9R
RPower supply for ECM[Ignition switch "ON"]BATTERY VOLTAGE
(11 - 14V)
A10 R Mass air flow sensor[Engine is running]
lWarm-up condition
lIdle speed0.5 - 2.5V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm1.5 - 3.5V
A11 L/OREngine coolant tempera-
ture sensor[Engine is running]
lWarm-up conditionApproximately 0 - 4.8V
Output voltage varies with engine
coolant temperature
A12 PU Fuel temperature sensor[Engine is running]
lWarm-up conditionApproximately 0 - 4.8V
Output voltage varies with fuel
temperature
A21 BAccelerator pedal
released position switch
ground[Ignition switch "ON"]Approximately 0V
A22 LGAccelerator pedal position
sensor 1 ground[Ignition switch "ON"]Approximately 0V
A23 B Sensor's ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
PBIB0387E
PBIB0388E
PBIB0389E
PBIB0390E

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´´

TROUBLE DIAGNOSIS
EC-693
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SELF-DIAGNOSTIC MODE
Regarding items detected in “SELF-DIAG RESULTS” mode, refer to —EC-654, "INDEX FOR DTC".
DATA MONITOR MODE
MONITOR ITEMECM
input
signalMain
signalsCONDITION SPECIFICATION
CKPS ·RPM (TDC) [rpm]´´
lThe engine speed computed from
the crankshaft position sensor (TDC)
signal is displayed.
COOLAN TEMP/S
[°C] or [°F]´´
lThe engine coolant temperature
(determined by the signal voltage of
the engine coolant temperature sen-
sor) is displayed.When the engine coolant temperature
circuit is open or short, ECM enters fail-
safe mode. The engine coolant temper-
ature determined by the ECM is dis-
played.
VHCL SPEED SE
[km/h] or [mph]´´
lThe vehicle speed computed form
the vehicle speed sensor signal is
displayed.
FUEL TEMP SEN [°C] or [°F]´´
lThe fuel temperature (determined by
the signal voltage of the fuel temper-
ature sensor) is displayed.
ACCEL POS SEN [V]´´
lThe accelerator pedal position sen-
sor 1 signal voltage is displayed.
ACCEL SEN 2 [V]´´
lThe accelerator pedal position sen-
sor 2 signal voltage is displayed.
OFF ACCEL SW [ON/OFF]´´
lindicates [ON/OFF] condition from
the accelerator pedal released posi-
tion switch signal.
ACT CR PRESS [MPa]´´
lThe common rail fuel pressure
(determined by the signal voltage of
the common rail fuel pressure sen-
sor) is displayed.
BATTERY VOLT [V]´´
lThe power supply voltage of ECM is
displayed.
P/N POSI SW [ON/OFF]´´
lIndicates [ON/OFF] condition from
the park/neutral position switch sig-
nal.
START SIGNAL [ON/OFF]´´
lindicates [ON/OFF] condition from
the starter signal.
PW/ST SIGNAL [ON/OFF]´
lindicates [ON/OFF] condition from
the power steering oil pressure
switch signal.
BRAKE SW [ON/OFF]´´
lindicates [ON/OFF] condition from
thestoplampswitchsignal.
IGN SW [ON/OFF]´´
lIndicates [ON/OFF] condition from
ignition switch signal.
MAS AIR/FL SE [V]´´
lThe signal voltage of the mass air
flow sensor is displayed.
SUCTION CV [°CA]´
lIndicates [°CA] of suction control
valve operating angle.
MAIN INJ WID [msec]´
lIndicates the actual fuel injection
pulse width compensated by ECM
according to the input signals.
GLOW RLY [ON/OFF]´
lThe glow relay control condition
(determined by ECM according to
the input signal) is displayed.

DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
EC-711
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DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
PFP:22630
DescriptionEBS004Q8
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: These data are reference values and measured between ECM terminal A11
(Engine coolant temperature sensor) and 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.
On Board Diagnosis LogicEBS004Q9
DTC Confirmation ProcedureEBS004QA
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If DTC is detected, go toEC-713, "
Diagnostic Procedure".
SEF594K
Engine coolant tempera-
ture°C(°F)Voltage* (V) Resistance (kW)
-10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.3 0.68 - 1.00
90 (194) 1.0 0.236 - 0.260
SEF012P
DTC Malfunction is detected when ... Check Items (Possible Cause)
P0115
lAn excessively high or low voltage from the sensor
is sent to ECM.lHarness or connectors
(The sensor circuit is open or shorted.)
lEngine coolant temperature sensor
SEF817Y

EC-712
[YD]
DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
Wiring Diagram
EBS004QB
TBWA0103E

DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
EC-713
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Diagnostic ProcedureEBS004QC
1.CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperature sensor harness connec-
tor.
3. Turn ignition switch “ON”.
4. Check voltage between ECTS terminal 1 and ground with CON-
SULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and engine coolant temperature sensor.
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK ECTS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between ECTS terminal 2 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 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and engine coolant temperature sensor.
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0374E
Voltage: Approximately 5V
PBIB0080E
Continuity should exist.

EC-714
[YD]
DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
5.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer toEC-714, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace engine coolant temperature sensor.
6.CHECK INTERMITTENT INCIDENT
Refer toEC-699, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS004QD
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

*: These data are measured between ECM terminal A11 (Engine coolant tem-
perature sensor) and body ground.
2. If NG, replace engine coolant temperature sensor.
Removal and InstallationEBS008YF
ENGINE COOLANT TEMPERATURE SENSOR
Refer toEM-173, "CYLINDER HEAD".
PBIB0081E
Engine coolant temperature°C(°F) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
SEF012P

DTC P1217 OVERHEAT (COOLING SYSTEM)
EC-761
[YD]
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DTC P1217 OVERHEAT (COOLING SYSTEM)PFP:00021
DescriptionEBS004QR
SYSTEM DESCRIPTION
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, air condi-
tioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
CONSULT-II Reference Value in Data Monitor ModeEBS004QS
Specification data are reference values.
ECM Terminals and Reference ValueEBS004QT
Specification data are reference values and are measured between each terminal and 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.
On Board Diagnosis LogicEBS004QU
This diagnosis continuously monitors the engine coolant temperature.
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
Sensor Input signal to ECM ECM function Actuator
Vehicle speed sensor Vehicle speed
Cooling fan
controlCooling fan relay Engine coolant temperature sensor Engine coolant temperature
Air conditioner switch Air conditioner “ON” signal
SEF421Z
MONITOR ITEM CONDITION SPECIFICATION
COOLING FANWhen cooling fan is stopped. OFF
When cooling fans operate at low speed. LOW
When cooling fans operate at high speed. HIGH
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
E2 LG Cooling fan relay (Low)[Engine is running]
lCooling fan is not operatingBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
lCooling fan is operatingApproximately 0.1V
E7 LG/B Cooling fan relay (High)[Engine is running]
lCooling fan is not operating
lCooling fan is operating at low speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
lCooling fan is operating at high speedApproximately 0.1V