2001 NISSAN X-TRAIL engine coolant

EC-1458
[YD]
DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
Diagnostic Procedure
EBS004QC
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 2.
NG >> Repair harness or connectors.
2. 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 3.
NG >> Repair harness or connectors.
3. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-1459, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace engine coolant temperature sensor.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
PBIB0374E
Voltage: Approximately 5V
PBIB0080E
Continuity should exist.

DTC P0115 ENGINE COOLANT TEMPERATURE (ECT) SENSOR (CIRCUIT)
EC-1459
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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 to EM-182, "CYLINDER HEAD" .
PBIB0081E
Engine coolant temperature °C (°F) Resistance kΩ
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
SEF012P

EC-1508
[YD]
DTC P1217 OVERHEAT (COOLING SYSTEM)
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]
●Cooling fan is not operatingBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●Cooling fan is operatingApproximately 0.1V
E7 LG/B Cooling fan relay (High)[Engine is running]
●Cooling fan is not operating
●Cooling fan is operating at low speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●Cooling fan is operating at high speedApproximately 0.1V

DTC P1217 OVERHEAT (COOLING SYSTEM)
EC-1509
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When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant following the procedure in the MA-27,
"Changing Engine Coolant" . Also, replace the engine oil.
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to
use coolant with the proper mixture ratio. Refer to MA-18, "
Engine Coolant Mixture Ratio" .
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
Overall Function CheckEBS004QV
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around the cap. Carefully remove the cap by turning it a quarter turn to allow built-
up pressure to escape. Then turn the cap all the way off.
WITH CONSULT-II
1. Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to EC-1511,
"Diagnostic Procedure" .
2. Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to EC-1511,
"Diagnostic Procedure" .
3. Turn ignition switch “ON”.
4. Perform “COOLING FAN” in “ACTIVE TEST” mode with CON-
SULT-II and make sure that cooling fans operate when touching
“HIGH” or “LOW”.
If NG, go to EC-1511, "
Diagnostic Procedure" .
DTC Malfunction is detected when ... Check Items (Possible Cause)
P1217
●Cooling fan does not operate properly (Overheat).
●Cooling fan system does not operate properly
(Overheat).
●Engine coolant was not added to the system using
the proper filling method.
●Harness or connectors
(The cooling fan circuit is open or shorted.)
●Cooling fan
●Radiator hose
●Radiator
●Radiator cap
●Water pump
●Thermostat
●Engine coolant temperature sensor
For more information, refer to EC-1517, "
Main 12
Causes of Overheating" .
AEC640
SEF111X

DTC P1217 OVERHEAT (COOLING SYSTEM)
EC-1513
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6.CHECK THERMOSTAT
1. Remove thermostat.
2. Check valve seating condition at normal room temperatures.
It should seat tightly.
3. Check valve opening temperature and valve lift.
4. Check if valve is closed at 5°C (9°F) below valve opening tem-
perature. For details, refer to CO-41, "
THERMOSTAT AND
WATER PIPING" .
OK or NG
OK >> GO TO 7.
NG >> Replace thermostat.
7.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-1459, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace engine coolant temperature sensor.
8.CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to EC-1517, "
Main 12 Causes of Overheating" .
>>INSPECTION END
PROCEDURE A
1.CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan relay-1.
3. Turn ignition switch “ON”.
4. Check voltage between cooling fan relay-1 terminals 1, 5, 7 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.Valve opening temperature:
80 - 84 °C (176 - 183 °F) [standard]
Valve lift:
More than 10 mm/95 °C (0.339 in/203 °F)
SLC343
Voltage: Battery voltage
PBIB0422E

DTC P1217 OVERHEAT (COOLING SYSTEM)
EC-1517
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5.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E64, F5
●Harness for open or short between cooling fan relays-2 and -3 and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK COOLING FAN RELAYS-2 AND -3
Refer to EC-1518, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace cooling fan relays.
7.CHECK COOLING FAN MOTORS
Refer to EC-1518, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace cooling fan motors.
8.CHECK INTERMITTENT INCIDENT
Perform EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Main 12 Causes of OverheatingEBS004QY
Engine Step Inspection item Equipment Condition Reference page
OFF 1
●Blocked radiator
●Blocked radiator grille
●Blocked bumper
●Visual No blocking —
2
●Coolant mixture●Coolant tester 50 - 50% coolant mixture See MA-16, "RECOM-
MENDED FLUIDS AND
LUBRICANTS" .
3
●Coolant level●Visual Coolant up to MAX level
in reservoir tank and radi-
ator filler neckSee MA-27, "Changing
Engine Coolant" .
4
●Radiator cap●Pressure tester 78 - 98 kPa (0.78 - 0.98
ba r, 0.8 - 1.0 kg/cm2 , 11 -
14 psi)See CO-33, "
Checking
Radiator Cap" .
ON*
25●Coolant leaks●Visual No leaks See CO-29, "CHECKING
RADIATOR SYSTEM
FOR LEAKS" .
ON*
26●Thermostat●Touch the upper and
lower radiator hosesBoth hoses should be hot See CO-41, "THERMO-
STAT AND WATER PIP-
ING" .
ON*
17●Cooling fan●CONSULT-II Operating See Trouble Diagnosis for
DTC P1217, EC-1458
.
OFF 8
●Combustion gas leak●Color checker chemi-
cal tester 4 Gas ana-
lyzerNegative —

EC-1518
[YD]
DTC P1217 OVERHEAT (COOLING SYSTEM)
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time.
For more information, refer to CO-25, "
OVERHEATING CAUSE ANALYSIS" .
Component InspectionEBS004QZ
COOLING FAN RELAY-1, -2 AND -3
Check continuity between terminals 3 and 5, 6 and 7 under the fol-
lowing conditions.
COOLING FAN MOTOR-1 AND -2
Supply battery voltage between the following terminals and check
operation.
ON*39●Coolant temperature
gauge●Visual Gauge less than 3/4
when driving—
●Coolant overflow to
reservoir tank●Visual No overflow during driv-
ing and idlingSeeMA-27, "Changing
Engine Coolant" .
OFF*
410●Coolant return from
reservoir tank to radia-
tor●Visual Should be initial level in
reservoir tankSeeMA-28, "REFILLING
ENGINE COOLANT" .
OFF 11
●Cylinder head●Straight gauge feeler
gauge0.1mm (0.004 in) Maxi-
mum distortion (warping)SeeEM-182, "CYLIN-
DER HEAD" .
12
●Cylinder block and pis-
tons●Visual No scuffing on cylinder
walls or pistonSeeEM-197, "CYLIN-
DER BLOCK" . Engine Step Inspection item Equipment Condition Reference page
Conditions Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
No current supply No
SEF745U
SpeedTe r m i n a l s
(+) (–)
Cooling fan motor-1Low 1 4
High 1, 2 3, 4
Cooling fan motor-2Low 1 4
High 1, 2 3, 4
PBIB0423E

EC-1544
[YD]
GLOW CONTROL SYSTEM
GLOW CONTROL SYSTEM
PFP:25230
DescriptionEBS0035J
SYSTEM DESCRIPTION
When engine coolant temperature is more than approximately 80°C (176°F), the glow relay turns off.
When coolant temperature is lower than approximately 80°C (176°F):
●Ignition switch ON
After ignition switch has turned to ON, the glow relay turns ON for a certain period of time in relation to
engine coolant temperature, allowing current to flow through glow plug.
●Cranking
The glow relay turns ON, allowing current to flow through glow plug.
●Starting
After engine has started, current continues to flow through glow plug (after-glow mode) for a certain period
in relation to engine coolant temperature.
The glow indicator lamp turns ON for a certain period of time in relation to engine coolant temperature at the
time glow relay is turned ON.
COMPONENT DESCRIPTION
Glow Plug
The glow plug is provided with a ceramic heating element to obtain a
high-temperature resistance. It glows in response to a signal sent
from the ECM, allowing current to flow through the glow plug via the
glow relay.
ECM Terminals and Reference ValueEBS0035K
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.
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (TDC) Engine speed
Glow controlGlow lamp
Glow relay
Glow plugs Engine coolant temperature sensor Engine coolant temperature
SEF376Y
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
D2 OR Glow lamp[Ignition switch “ON”]
●Glow lamp is “ON”Approximately 1.0V
[Ignition switch “ON”]
●Glow lamp is “OFF”BATTERY VOLTAGE
(11 - 14V)
E9 W/R Glow relay Refer to EC-1544, "
SYSTEM DESCRIPTION"