2003 NISSAN X-TRAIL heating

OVERHEATING CAUSE ANALYSIS
CO-5
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OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartEBS00KOD
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
— Thermostat and water con-
trol valve stuck closed—
Damaged finsDust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
Fan assembly — High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio—— —
Poor engine coolant quality — Engine coolant viscosity —
Insufficient engine coolantEngine coolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration

CO-6
[QR]
OVERHEATING CAUSE ANALYSIS

Except cool-
ing system
parts mal-
function— Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Power train system mal-
function
— Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper —
— Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator —
Blocked condenser
Blocked air flow
Installed large fog lamp Symptom Check items

THERMOSTAT AND WATER CONTROL VALVE
CO-23
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INSPECTION AFTER REMOVAL

Place a string so that it is caught in the valves of thermostat and
water control valve. Immerse fully in a container filled with water.
Heat while stirring. (The example in the figure shows thermo-
stat.)

The valve opening temperature is the temperature at which the
valve opens and falls from the thread.

Continue heating. Check the full open valve lift amount.
NOTE:
The full open valve lift amount standard temperature for water
control valve is the reference value.

After checking the full open valve lift amount, lower the water
temperature and check the valve closing temperature.
Standard:

If out of the standard, replace either or both thermostat and water control valve.
INSTALLATION
Note the following, and install in the reverse order of removal.
Thermostat and Water Control Valve

Install thermostat with making rubber ring groove fit to thermo-
stat flange with the whole circumference. (The example in the
figure shows thermostat.)
NOTE:
Same procedure is applied for installation of water control valve.

Install thermostat with jiggle valve facing upwards. (The position
deviation may be within the range of 20 degrees as shown in the
figure.)

Install water control valve with the arrow facing up and the frame
center part facing upwards. (The position deviation may be
within the range of 20 degrees as shown in the figure.)
Heater Pipe Installation
Apply a neutral detergent to O-ring, then quickly insert the insertion part of heater pipe into cylinder block.
INSPECTION AFTER INSTALLATION

Check for leaks of engine coolant using a radiator cap tester adapter (special service tool: EG17650301)
and a radiator cap tester (commercial service tool). Refer to CO-9, "
LEAK CHECK" .

Start and warm up engine. Visually check if there is no leaks of engine coolant and A/T fluid (A/T models).
SLC252B
Items Thermostat Water control valve
Valve opening temperature 80.5 - 83.5°C (177 - 182°F) 93.5 - 96.5°C (200 - 206°F)
Full open valve liftMore than 8 mm/ 95°C
(0.315 in/ 203°F)More than 8 mm/ 108°C
(0.315 in/ 226°F)
Valve closing temperature More than 77°C (171°F) More than 90°C (194°F)
PBIC0157E
PBIC0158E

PRECAUTIONS
CO-25
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[YD22DDTi]PRECAUTIONSPFP:00001
Precautions For Liquid GasketEBS01276
LIQUID GASKET APPLICATION PROCEDURE
1. Remove old liquid gasket adhering to the liquid gasket application surface and the mating surface.

Remove liquid gasket completely from the liquid gasket application surface, mounting bolts, and bolt
holes.
2. Wipe the liquid gasket application surface and the mating surface with white gasoline (lighting and heating
use) to remove adhering moisture, grease and foreign materials.
3. Attach liquid gasket tube to the tube presser (special service
tool).
Use Genuine Liquid Gasket or equivalent.

Within five minutes of liquid gasket application, install the mat-
ing component.

If liquid gasket protrudes, wipe it off immediately.

Do not retighten mounting bolts or nuts after the installation.

After 30 minutes or more have passed from the installation, fill
engine oil and engine coolant.
PBIC2160E

OVERHEATING CAUSE ANALYSIS
CO-27
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OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartEBS00BAW
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
— Thermostat stuck closed —
Damaged finsDust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ateRefer to DTC in EC1217
(cooling system)
— High resistance to fan rota-
tion
Fan assembly
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio—— —
Poor engine coolant quality — Engine coolant density —
Insufficient engine coolantEngine coolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration

CO-28
[YD22DDTi]
OVERHEATING CAUSE ANALYSIS

Except cool-
ing system
parts mal-
function— Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
— Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper —
— Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator —
Blocked condenser
Blocked air flow
Installed large fog lamp Symptom Check items

THERMOSTAT AND WATER PIPING
CO-45
[YD22DDTi]
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INSPECTION AFTER REMOVAL
Thermostat

Place a string so that it is caught in the valves of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.

The valve opening temperature is the temperature at which the
valve opens and falls from the thread.

Continue heating. Check the full-open lift amount.

After checking the full-open lift amount, lower the water temper-
ature and check the valve closing temperature.
Standard values

If out of the standard, replace thermostat.
INSTALLATION
Note the following, and install in the reverse order of removal.

Install the thermostat with the whole circumference of each
flange part fit securely inside the rubber ring.

Install the thermostat with the jiggle valve facing upwards.
INSPECTION AFTER INSTALLATION

Check for leaks of engine coolant using the radiator cap tester adapter (special service tool:
EG17650301) and the radiator cap tester (commercial service tool). Refer to CO-31, "
CHECKING RADIA-
TOR SYSTEM FOR LEAKS" .

Start and warm up engine. Visually check if there is no leaks of engine coolant.
SLC252B
Item Thermostat
Valve opening temperature 80 - 84°C (176 - 183° F)
Full-open lift amount More than 10 mm/ 95°C (0.39 in/ 203 °F)
Valve closing temperature More than 77°C (171°F)
JLC300B

EC-4 CONSULT-II Reference Value in Data Monitor Mode
.302
On Board Diagnosis Logic ....................................302
DTC Confirmation Procedure ...............................302
Wiring Diagram .....................................................304
Diagnostic Procedure ...........................................307
Component Inspection ..........................................309
DTC P1128 THROTTLE CONTROL MOTOR .........310
Component Description ........................................310
On Board Diagnosis Logic ....................................310
DTC Confirmation Procedure ...............................310
Wiring Diagram .....................................................311
Diagnostic Procedure ...........................................315
Component Inspection ..........................................316
Removal and Installation ......................................317
DTC P1143 HO2S1 .................................................318
Component Description ........................................318
CONSULT-II Reference Value in Data Monitor Mode
.318
On Board Diagnosis Logic ....................................318
DTC Confirmation Procedure ...............................319
Overall Function Check ........................................319
Diagnostic Procedure ...........................................320
Component Inspection ..........................................322
Removal and Installation ......................................323
DTC P1144 HO2S1 .................................................324
Component Description ........................................324
CONSULT-II Reference Value in Data Monitor Mode
.324
On Board Diagnosis Logic ....................................324
DTC Confirmation Procedure ...............................325
Overall Function Check ........................................325
Diagnostic Procedure ...........................................326
Component Inspection ..........................................328
Removal and Installation ......................................329
DTC P1146 HO2S2 .................................................330
Component Description ........................................330
CONSULT-II Reference Value in Data Monitor Mode
.330
On Board Diagnosis Logic ....................................330
DTC Confirmation Procedure ...............................331
Overall Function Check ........................................332
Wiring Diagram .....................................................333
Diagnostic Procedure ...........................................334
Component Inspection ..........................................336
Removal and Installation ......................................337
DTC P1147 HO2S2 .................................................338
Component Description ........................................338
CONSULT-II Reference Value in Data Monitor Mode
.338
On Board Diagnosis Logic ....................................338
DTC Confirmation Procedure ...............................339
Overall Function Check ........................................340
Wiring Diagram .....................................................341
Diagnostic Procedure ...........................................342
Component Inspection ..........................................344
Removal and Installation ......................................345
DTC P1211 TCS CONTROL UNIT ..........................346
Description ............................................................346On Board Diagnosis Logic ....................................346
DTC Confirmation Procedure ................................346
Diagnostic Procedure ............................................346
DTC P1212 TCS COMMUNICATION LINE .............347
Description ............................................................347
On Board Diagnosis Logic ....................................347
DTC Confirmation Procedure ................................347
Diagnostic Procedure ............................................347
DTC P1217 ENGINE OVER TEMPERATURE ........348
System Description ...............................................348
CONSULT-II Reference Value in Data Monitor Mode
.349
On Board Diagnosis Logic ....................................349
Overall Function Check .........................................349
Wiring Diagram .....................................................352
Diagnostic Procedure ............................................355
Main 12 Causes of Overheating ...........................362
Component Inspection ..........................................363
DTC P1225 TP SENSOR ........................................364
Component Description ........................................364
On Board Diagnosis Logic ....................................364
DTC Confirmation Procedure ................................364
Diagnostic Procedure ............................................365
Removal and Installation .......................................365
DTC P1226 TP SENSOR ........................................366
Component Description ........................................366
On Board Diagnosis Logic ....................................366
DTC Confirmation Procedure ................................366
Diagnostic Procedure ............................................367
Removal and Installation .......................................367
DTC P1229 SENSOR POWER SUPPLY ................368
On Board Diagnosis Logic ....................................368
DTC Confirmation Procedure ................................368
Wiring Diagram .....................................................369
Diagnostic Procedure ............................................370
DTC P1706 PNP SWITCH .......................................373
Component Description ........................................373
CONSULT-II Reference Value in Data Monitor Mode
.373
On Board Diagnosis Logic ....................................373
DTC Confirmation Procedure ................................373
Overall Function Check .........................................373
Wiring Diagram .....................................................375
Diagnostic Procedure ............................................376
DTC P1720 VSS ......................................................378
Description ............................................................378
CONSULT-II Reference Value in Data Monitor Mode
.378
On Board Diagnosis Logic ....................................378
DTC Confirmation Procedure ................................378
Diagnostic Procedure ............................................379
DTC P1805 BRAKE SWITCH .................................380
Description ............................................................380
CONSULT-II Reference Value in Data Monitor Mode
.380
On Board Diagnosis Logic ....................................380
FAIL-SAFE MODE ................................................380
DTC Confirmation Procedure ................................380
Wiring Diagram .....................................................381