2008 NISSAN LATIO overheating

PRECAUTIONS
AT-9
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• Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings and
seals, or hold bearings and washers in place during assembly. Do not use grease.
• Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
• Clean or replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer. Refer to
Refer to .
• After overhaul, refill the A/T with new ATF.
• When the A/T drain plug is removed, only some of the fluid is drained. Old A/T fluid will remain in torque con-
verter and ATF cooling system.
Always follow the procedures under “Changing A/T Fluid” in the AT section when changing A/T fluid. Refer to
MA-22, "
Changing A/T Fluid", MA-22, "Checking A/T Fluid".
Service Notice or PrecautionINFOID:0000000001703155
ATF COOLER SERVICE
If A/T fluid contains frictional material (clutches, bands, etc.), or if an A/T is repaired, overhauled, or replaced,
inspect and clean the A/T oil cooler mounted in the radiator or replace the radiator. Flush cooler lines using
cleaning solvent and compressed air after repair. Check Service Bulletins for latest A/T oil cooler cleaning pro-
cedure. For radiator replacement, refer to Refer to CO-11
.
TORQUE CONVERTER SERVICE
The torque converter should be replaced under any of the following conditions:
• External leaks in the hub weld area.
• Converter hub is scored or damaged.
• Converter pilot is broken, damaged or fits poorly into crankshaft.
• Steel particles are found after flushing the cooler and cooler lines.
• Pump is damaged or steel particles are found in the converter.
• Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses
have been made. (Converter clutch material may be glazed.)
• Converter is contaminated with engine coolant containing antifreeze.
• Internal malfunction of stator roller clutch.
• Heavy clutch debris due to overheating (blue converter).
• Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged — indicates that lining material came from converter.
The torque converter should not be replaced if:
• The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.
• The threads in one or more of the converter bolt holes are damaged.
• A/T malfunction did not display evidence of damaged or worn internal parts, steel particles or clutch plate lin-
ing material in unit and inside the fluid filter.
• Vehicle has been exposed to high mileage (only). The exception may be where the torque converter clutch
dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic, such as
taxi, delivery or police use.
OBD-II SELF-DIAGNOSIS
• A/T self-diagnosis is performed by the TCM in combination with the ECM. The results can be read through
the blinking pattern of the OD OFF indicator lamp or the malfunction indicator lamp (MIL). Refer to the table
on AT-78, "
Diagnosis Procedure without CONSULT-III" for the indicator used to display each self-diagnostic
result.
• The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and TCM memo-
ries.
Always perform the procedure “HOW TO ERASE DTC” on AT-36, "
OBD-II Diagnostic Trouble Code
(DTC)" to complete the repair and avoid unnecessary blinking of the MIL.
• The following self-diagnostic items can be detected using ECM self-diagnostic results mode* only when the
OD OFF indicator lamp does not indicate any malfunctions.
-PNP switch
- A/T 1st, 2nd, 3rd, or 4th gear function
*: For details of OBD-II, refer to AT- 3 6
.
•Certain systems and components, especially those related to OBD, may use a new style slide-lock-
ing type harness connector.
For description and how to disconnect, refer to PG-65
.

CO-1
ENGINE
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SECTION CO
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CONTENTS
ENGINE COOLING SYSTEM
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .....................................
2
Precaution for Liquid Gasket .....................................2
PREPARATION ...................................................4
Special Service Tool .................................................4
Commercial Service Tool ..........................................4
OVERHEATING CAUSE ANALYSIS ..................5
Troubleshooting Chart ...............................................5
COOLING SYSTEM ............................................7
Cooling Circuit ...........................................................7
ENGINE COOLANT ............................................8
Inspection ..................................................................8
Changing Engine Coolant .........................................8
RADIATOR .........................................................11
Component ..............................................................11
Removal and Installation .........................................11
Checking Radiator Cap ...........................................13
Checking Radiator ...................................................13
COOLING FAN ..................................................14
Component (Models with A/C) .................................14
Component (Models without A/C) ............................14
Removal and Installation .........................................15
DISASSEMBLY AND ASSEMBLY ..........................15
WATER PUMP ..................................................16
Component ..............................................................16
Removal and Installation .........................................16
THERMOSTAT ..................................................17
Component ..............................................................17
Removal and Installation .........................................17
WATER OUTLET AND WATER CONTROL
VALVE ...............................................................
19
Component ..............................................................19
Removal and Installation .........................................19
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
22
Standard and Limit ..................................................22

OVERHEATING CAUSE ANALYSIS
CO-5
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OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000001702527
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
— Thermostat stuck closed Thermostat
Damaged finsDust contamination or pa-
per 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—
—
Engine coolant viscosity—
Poor engine coolant quality — —
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 cool-
ing systemCylinder head deterioration
Cylinder head gasket deteri-
oration

CO-6
< SERVICE INFORMATION >
OVERHEATING CAUSE ANALYSIS
Except cool-
ing system
parts mal-
function— Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for ex-
tended 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 —
Installed front bumper fas-
cia cover
— Blocked radiator grille
Mud contamination or paper
clogging
Blocked radiator
—
Blocked air flow Blocked condenser
Installed large fog lamp Symptom Check items

EC-6
Overall Function Check .........................................406
Wiring Diagram ......................................................407
Diagnosis Procedure .............................................408
DTC P1148 CLOSED LOOP CONTROL .........411
On Board Diagnosis Logic .....................................411
DTC P1217 ENGINE OVER TEMPERATURE .412
System Description ................................................412
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
413
On Board Diagnosis Logic .....................................413
Overall Function Check .........................................413
Wiring Diagram ......................................................416
Diagnosis Procedure .............................................417
Main 13 Causes of Overheating ............................424
Component Inspection ...........................................424
DTC P1225 TP SENSOR .................................426
Component Description .........................................426
On Board Diagnosis Logic .....................................426
DTC Confirmation Procedure ................................426
Diagnosis Procedure .............................................426
Removal and Installation .......................................427
DTC P1226 TP SENSOR .................................428
Component Description .........................................428
On Board Diagnosis Logic .....................................428
DTC Confirmation Procedure ................................428
Diagnosis Procedure .............................................428
Removal and Installation .......................................429
DTC P1421 COLD START CONTROL ............430
Description .............................................................430
On Board Diagnosis Logic .....................................430
DTC Confirmation Procedure ................................430
Diagnosis Procedure .............................................430
DTC P1564 ASCD STEERING SWITCH .........432
Component Description .........................................432
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
432
On Board Diagnosis Logic .....................................432
DTC Confirmation Procedure ................................433
Wiring Diagram ......................................................434
Diagnosis Procedure .............................................435
Component Inspection ...........................................437
DTC P1572 ASCD BRAKE SWITCH ..............438
Component Description .........................................438
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
438
On Board Diagnosis Logic .....................................438
DTC Confirmation Procedure ................................439
Wiring Diagram ......................................................440
Diagnosis Procedure .............................................441
Component Inspection ...........................................445
DTC P1574 ASCD VEHICLE SPEED SEN-
SOR ..................................................................
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Component Description .........................................447
On Board Diagnosis Logic ....................................447
DTC Confirmation Procedure ................................447
Diagnosis Procedure .............................................448
DTC P1715 INPUT SPEED SENSOR (TUR-
BINE REVOLUTION SENSOR) ........................
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Description ............................................................449
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
449
On Board Diagnosis Logic ....................................449
Diagnosis Procedure .............................................449
DTC P1715 INPUT SPEED SENSOR (PRIMA-
RY SPEED SENSOR) .......................................
450
Description ............................................................450
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
450
On Board Diagnosis Logic ....................................450
DTC Confirmation Procedure ................................450
Diagnosis Procedure .............................................451
DTC P1805 BRAKE SWITCH ..........................452
Description ............................................................452
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
452
On Board Diagnosis Logic ....................................452
DTC Confirmation Procedure ................................452
Wiring Diagram .....................................................453
Diagnosis Procedure .............................................454
Component Inspection ..........................................455
DTC P2100, P2103 THROTTLE CONTROL
MOTOR RELAY ................................................
456
Component Description ........................................456
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
456
On Board Diagnosis Logic ....................................456
DTC Confirmation Procedure ................................456
Wiring Diagram .....................................................458
Diagnosis Procedure .............................................459
DTC P2101 ELECTRIC THROTTLE CON-
TROL FUNCTION .............................................
461
Description ............................................................461
On Board Diagnosis Logic ....................................461
DTC Confirmation Procedure ................................461
Wiring Diagram .....................................................462
Diagnosis Procedure .............................................463
Component Inspection ..........................................466
Removal and Installation .......................................466
DTC P2118 THROTTLE CONTROL MOTOR ..467
Component Description ........................................467
On Board Diagnosis Logic ....................................467
DTC Confirmation Procedure ................................467
Wiring Diagram .....................................................468
Diagnosis Procedure .............................................469
Component Inspection ..........................................470
Removal and Installation .......................................470

DTC P1217 ENGINE OVER TEMPERATURE
EC-413
< SERVICE INFORMATION >
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P O Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R through CAN communication line.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000001702930
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001702931
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise. When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction
is indicated.
This self-diagnosis has the one trip detection logic.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant. Refer to CO-8, "
Changing Engine
Coolant". Also, replace the engine oil. Refer to LU-7, "Changing 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-11, "
Anti-freeze Coolant Mixture Ratio".
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
Overall Function CheckINFOID:0000000001702932
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WARNING:
Cooling fan speedCooling fan relay
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Stop (OFF) OFF OFF OFF
Low (LOW) ON OFF OFF
High (HI) OFF ON ON
MONITOR ITEM CONDITION SPECIFICATION
AIR COND SIG• Engine: After warming up, idle
the engineAir conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates.)ON
COOLING FAN• Engine: After warming up, idle
the engine
• Air conditioner switch: OFFEngine coolant temperature: 97°C
(207°F) or lessOFF
Engine coolant temperature: Between
98°C (208°F) and 99°C (210°F) or
moreLOW
Engine coolant temperature: 100°C
(212°F) or moreHIGH
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1217
1217Engine over temperature
(Overheat)• Cooling fan does not operate properly (Over-
heat).
• Cooling fan system does not operate properly
(Overheat).
• Engine coolant was not added to the system
using the proper filling method.
• Engine coolant is not within the specified
range.• Harness or connectors
(Cooling fan circuit is open or shorted.)
• Cooling fan
• IPDM E/R (Cooling fan relays)
•Radiator hose
•Radiator
• Reservoir tank
•Radiator cap
• Water pump
•Thermostat
• Water control valve
For more information, refer to EC-424,
"Main 13 Causes of Overheating".

DTC P1217 ENGINE OVER TEMPERATURE
EC-419
< SERVICE INFORMATION >
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5. Restart engine and make sure that cooling fan operate at higher
speed than low speed.
OK or NG
OK >> GO TO 6.
NG >> Check cooling fan high speed control circuit. (Go to
"PROCEDURE A".)
6.CHECK COOLING SYSTEM FOR LEAK
Refer to CO-8
.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following for leak.
•Hose
• Radiator
• Water pump (Refer to CO-16
.)
>> Repair or replace.
8.CHECK RADIATOR CAP
Refer to CO-11
.
OK or NG
OK >> GO TO 9.
NG >> Replace radiator cap.
9.CHECK COMPONENT PARTS
Check the following;.
• Thermostat. (Refer to CO-16
.)
• Water control valve. (Refer to CO-19
.)
• Engine coolant temperature sensor. (Refer to EC-191, "
Component Inspection".)
OK or NG
OK >> GO TO 10.
NG >> Replace malfunctioning component.
10.CHECK MAIN 13 CAUSES
If the cause cannot be isolated, go to EC-424, "
Main 13 Causes of Overheating".
>>INSPECTION END
PROCEDURE A
1.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E44.
SEF023R

EC-422
< SERVICE INFORMATION >
DTC P1217 ENGINE OVER TEMPERATURE
2. Disconnect engine coolant temperature sensor harness connector.
3. Connect 150Ω resistor to engine coolant temperature sensor harness connector.
4. Restart engine and make sure that cooling fan operates at
higher speed than low speed.
OK or NG
OK >> GO TO 6.
NG >> Check cooling fan high speed control circuit. (Go to
"PROCEDURE A")
6.CHECK COOLING SYSTEM FOR LEAK
Refer to CO-8
.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following for leak.
•Hose
• Radiator
• Water pump (Refer to CO-16
.)
>> Repair or replace.
8.CHECK RADIATOR CAP
Refer to CO-11
.
OK or NG
OK >> GO TO 9.
NG >> Replace radiator cap.
9.CHECK THERMOSTAT
Refer to CO-17
.
OK or NG
OK >> GO TO 10.
NG >> Replace thermostat.
10.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-191, "
Component Inspection".
OK or NG
OK >> GO TO 11.
NG >> Replace engine coolant temperature sensor.
11 .CHECK MAIN 13 CAUSES
If the cause cannot be isolated, go to EC-424, "
Main 13 Causes of Overheating".
>>INSPECTION END
PROCEDURE B
1.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E44.
SEF023R