thermostat INFINITI M35 2007 Factory Owner's Guide

DTC P0125 ECT SENSOR
EC-939
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Revision: 2007 April2007 M35/M45
DTC P0125 ECT SENSORPFP:22630
Component DescriptionNBS005D8
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-926, "
DTC P0117, P0118 ECT SENSOR" .
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.

*: This data is reference value and is measured between ECM terminal 73 (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 LogicNBS005D9
SEF594K
Engine coolant
temperature°C (°F)Voltage* V Resistance kΩ
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0125
0125Insufficient engine coolant
temperature for closed
loop fuel control

Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.

Engine coolant temperature is insufficient for
closed loop fuel control.

Harness or connectors
(High resistance in the circuit)

Engine coolant temperature sensor

Thermostat

DTC P0125 ECT SENSOR
EC-941
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Revision: 2007 April2007 M35/M45
3. CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine
coolant does not flow.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace thermostat. Refer to CO-55, "
THERMOSTAT AND WATER CONTROL VALVE" .
4. CHECK INTERMITTENT INCIDENT
Refer to EC-857, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
Refer to EC-928, "
Wiring Diagram" .
>>INSPECTION END
Component InspectionNBS005DC
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.
Removal and InstallationNBS005DD
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" .
PBIB2005E
Temperature°C (°F) Resistance kΩ
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
SEF012P

DTC P0128 THERMOSTAT FUNCTION
EC-945
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DTC P0128 THERMOSTAT FUNCTIONPFP:21200
On Board Diagnosis LogicNBS005DK
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.
DTC Confirmation ProcedureNBS005DL
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:

For best results, perform at ambient temperature of –10°C (14°F) or higher.

For best results, perform at engine coolant temperature of –10°C (14°F) to 60°C (140°F).
WITH CONSULT-II
1. Replace thermostat with new one. Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" .
Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may
come on.
2. Turn ignition switch ON.
3. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
4. Check that the “COOLAN TEMP/S” is above 60°C (140°F).
If it is below 60°C (140°F), go to following step.
If it is above 60°C (140°F), cool down the engine to less than
60°C (140°F), then retry from step 1.
5. Drive vehicle for 10 consecutive minutes under the following
conditions.
If 1st trip DTC is detected, go to EC-945, "
Diagnostic Procedure"
.
WITH GST
1. Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureNBS005DM
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-946, "
Component Inspection" .
OK or NG
OK >>INSPECTION END
NG >> Replace engine coolant temperature sensor.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0128
0128Thermostat functionThe engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.

Thermostat

Leakage from sealing portion of thermostat

Engine coolant temperature sensor
VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH)
SEF176Y

EC-946
[VK45DE]
DTC P0128 THERMOSTAT FUNCTION
Revision: 2007 April2007 M35/M45
Component InspectionNBS005DN
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.
Removal and InstallationNBS005DO
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" .
PBIB2005E
Temperature °C (°F) Resistance kΩ
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.0
90 (194) 0.236 - 0.260
SEF012P

DTC P1217 ENGINE OVER TEMPERATURE
EC-1215
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Revision: 2007 April2007 M35/M45
Cooling Fan Motor
Cooling fan motor receives cooling fan motor operating voltage from
cooling fan control module (1). The revolution speed of cooling fan
motor is controlled by duty cycle of the voltage.

: Vehicle front

Cooling fan motor-2 (2)

Cooling fan motor-1 (3)
CONSULT-II Reference Value in Data Monitor ModeNBS005KR
Specification data are reference values.
On Board Diagnosis LogicNBS005KS
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-40, "
Changing Engine
Coolant" . Also, replace the engine oil. Refer to LU-28, "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-13, "
Anti-Freeze Coolant Mixture Ratio" .
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
Overall Function CheckNBS005KT
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 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.
PBIB3346E
MONITOR ITEM CONDITION SPECIFICATION
FAN DUTY

Engine: Running 0 - 100%
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
(The cooling fan circuit is open or
shorted.)

IPDM E/R

Cooling fan control module

Cooling fan motor

Radiator hose

Radiator

Radiator cap

Water pump

Thermostat

Water control valve
For more information, refer to EC-1223,
"Main 13 Causes of Overheating" .

EC-1220
[VK45DE]
DTC P1217 ENGINE OVER TEMPERATURE
Revision: 2007 April2007 M35/M45
4. CHECK THERMOSTAT
Check the following.

Thermostat. (Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" .)

Water control valve. (Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" .)

Engine coolant temperature sensor. (Refer to EC-931, "Component Inspection" .)
OK or NG
OK >> GO TO 5.
NG >> Replace malfunctioning component.
5. CHECK MAIN 13 CAUSES
If the cause cannot be isolated, go to EC-1223, "
Main 13 Causes of Overheating" .
>>INSPECTION END
6. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect cooling fan control module (1) harness connector
E42.
–: Vehicle front
–Cooling fan motor-2 (2)
–Cooling fan motor-1 (3)
3. Turn ignition switch ON.
4. Check voltage between cooling fan control module terminal 3
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 7.
NG >> GO TO 12.
7. CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between cooling fan control module terminal 1 and ground.
Refer to wiring diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 8.
NG >> Repair open circuit or short to power in harness or connectors.
PBIB3346E
Voltage: Battery voltage
PBIA9509J
Continuity should exist.

DTC P1217 ENGINE OVER TEMPERATURE
EC-1223
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Revision: 2007 April2007 M35/M45
16. CHECK INTERMITTENT INCIDENT
Perform EC-857, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R. Refer to PG-18, "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MOD-
ULE ENGINE ROOM)" .
NG >> Repair or replace harness connectors.
Main 13 Causes of OverheatingNBS005KW
*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-36, "
OVERHEATING CAUSE ANALYSIS" . Engine Step Inspection item Equipment Standard Reference page
OFF 1

Blocked radiator

Blocked condenser

Blocked radiator grille

Blocked bumper

Visual No blocking —
2

Coolant mixture
Coolant tester 50 - 50% coolant mixtureMA-13
3
Coolant level
Visual Coolant up to MAX level
in reservoir tank and radi-
ator filler neckCO-40
4
Radiator cap
Pressure tester 59 - 98 kPa
(0.6 - 1.0 kg/cm2 , 9 - 14
psi) (Limit)CO-45
ON*25
Coolant leaks
Visual No leaksCO-40
ON*26
Thermostat
Touch the upper and
lower radiator hosesBoth hoses should be hotCO-55
ON*17
Cooling fan
CONSULT-II Operating See trouble diagnosis for
DTC P1217 (EC-1214
).
OFF 8

Combustion gas leak
Color checker chemical
tester 4 Gas analyzerNegative —
ON*
39
Coolant temperature
gauge
Visual Gauge less than 3/4
when driving—

Coolant overflow to
reservoir tank
Visual No overflow during driving
and idlingCO-40
OFF*410
Coolant return from
reservoir tank to radia-
tor
Visual Should be initial level in
reservoir tankCO-40
OFF 11
Water control valve
Remove and inspect
the valveWithin the specified valueCO-55
OFF 12
Cylinder head
Straight gauge feeler
gauge0.1 mm (0.004 in) Maxi-
mum distortion (warping)EM-235
13
Cylinder block and pis-
tons
Visual No scuffing on cylinder
walls or pistonEM-252

IDX-7
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ALPHABETICAL INDEX
Refrigerant general precaution .......................... ATC-7
Refrigerant lines ............................................ ATC-150
Refrigerant pressure sensor ........... EC-704, EC-1424,
ATC-97
, ATC-166
Refrigeration cycle ........................................... ATC-20
Removal and installation (A/T) ........... AT-274, AT-278
Removal and installation (Transfer) .................... TF-44
Reverse interlock door mirror ........................... GW-94
Revolution sensor (A/T) ...................... AT-119, AT-263
Rocker cover(VK45DE) ................................... EM-199
Rocker cover(VQ35DE) ..................................... EM-53
Room lamp - See Interior lamp ......................... LT-266
ROOM/L - Wiring diagram ................................ LT-273
RP/SEN - Wiring diagram ................ EC-705, EC-1425
S
SAE J1979 - Service $01 - 09 ............. EC-54
, EC-756
SEAT - Wiring diagram ...................................... SE-99
Seat belt inspection ........................................... SB-32
Seat belt, front ................................................... SB-29
Seat belt, rear .................................................... SB-31
Seat, rear ......................................................... SE-173
Self-diagnosis (Transfer) .................................... TF-22
SEN/PW - Wiring diagram ............... EC-487, EC-1194
SHIFT - Wiring diagram ................................... AT-230
Shift lock system .............................................. AT-229
Shock absorber (rear) ..................................... RSU-10
Side air bag (satellite) sensor .......................... SRS-50
Side curtain air bag .......................................... SRS-47
Side trim .............................................................. EI-37
SMJ (super multiple junction) .......................... PG-109
Spark plug replacement ..................................... MA-27
Spark plug replacement(VQ35DE) .................... MA-20
Spark plug(VK45DE) ....................................... EM-191
Spark plug(VQ35DE) ......................................... EM-45
Specification value ............................. EC-143, EC-847
Speedometer ........................................................ DI-5
Spiral cable ...................................................... SRS-44
SROOF - Wiring diagram .................................. RF-13
SRS - See Supplemental Restraint System ...... SRS-5
SRS - Wiring diagram ...................................... SRS-13
SRS Trouble diagnoses ..................................... SRS-9
Stabilizer bar (rear) ......................................... RSU-17
Stall test (A/T) .................................................... AT-53
Standardized relay ........................................... PG-112
START - Wiring diagram ..................................... SC-9
Starter .................................................................. SC-8
Starting system .................................................... SC-8
Steering gear and linkage inspection ................ MA-36
Steering wheel and column ................... PS-10, PS-13
Steering wheel turning force .............................. PS-10
Stop lamp ......................................................... LT-242
Stop lamp switch ............................. EC-589, EC-1307
STSIG - Wiring diagram .................................. AT-109
Sun roof, electric ................................................ RF-10
Sunload sensor ............................. ATC-118, ATC-127
Sunroof .................................................. RF-24, RF-27
Sunshade ............................................................ EI-44
Supplemental Restraint System ....................... SRS-5
Supplemental restraint system - Wiring diagram ..........
SRS-13
Suspension ....................................................... MA-37
Symbols and abbreviations ...................... GI-11, GI-24
System readiness test (SRT) code ...... EC-60, EC-762
T
Tachometer ........................................................... DI-5
Tail lamp ........................................................... LT-248
TCM circuit diagram ........................................... AT-52
TCM inspection table ......................................... AT-89
Thermostat(VK45DE) ....................................... CO-55
Thermostat(VQ35DE) ....................................... CO-29
Three way catalyst function (Bank 1) EC-380, EC-1089
Three way catalyst function (Bank 2) EC-380, EC-1089
Three way catalyst precautions ............................ GI-5
Three way catalyst(VK45DE) .......................... EM-183
Throttle control motor ....................... EC-610, EC-1329
Throttle control motor relay .............. EC-598, EC-1316
Throttle position sensor (TPS) .......... EC-219, EC-342,
EC-518
, EC-520, EC-631, EC-932, EC-1054, EC-1233,
EC-1235
, EC-1350
Throttle valve closed position learning . EC-86, EC-788
Tie-rod ............................................................... PS-19
Timing chain(VK45DE) ................................... EM-203
Timing chain(VQ35DE) ..................................... EM-66
Tire rotation ....................................................... MA-35
TLID - Wiring diagram ...................................... BL-209
Top tether strap child restraint ........................... SB-36
Torque converter installation ............. AT-277, AT-280
Torque convertor clutch solenoid valve AT-126, AT-128
TPS1 - Wiring diagram .................... EC-344, EC-1056
TPS2 - Wiring diagram ...................... EC-221, EC-934
TPS3 - Wiring diagram .................... EC-633, EC-1352
Transfer control unit inspection table ................. TF-20
TRNSCV - Wiring diagram ............................... BL-278
Trouble diagnoses .............................................. GI-12
Trunk lid ........................................................... BL-201
Trunk lid opener - See Trunk lid ...................... BL-207
TURN - Wiring diagram .................................... LT-216
Turn signal lamp ............................................... LT-212
Two trip detection logic ........................ EC-54, EC-756
Tyre pressure monitoring system - trouble diagnoses ..
WT-12
U
Unified meter and A/C amp. ............................... DI-28
Upper link (front susp.) ..................... FSU-16, FSU-34
V
Vacuum hose (brake system) ............................ BR-20
Valve clearance(VK45DE) .............................. EM-224
Valve clearance(VQ35DE) ................................ EM-94
Valve guide ..................................................... EM-109
Valve guide(VK45DE) ..................................... EM-243

ENGINE MAINTENANCE (VQ35DE ENGINE)
MA-17
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Revision: 2007 April2007 M35/M45

When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.
5. Install radiator cap.
6. Warm up engine until opening thermostat. Standard for warming-up time is approximately 10 minutes at
3,000 rpm.

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
7. Stop the engine and cool down to less than approximately 50°C (122°F).

Cool down using fan to reduce the time.

If necessary, refill radiator up to filler neck with engine coolant.
8. Refill reservoir tank to “MAX” level line with engine coolant.
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.
10. Check cooling system for leaks with engine running.
11. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to
3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.

Sound may be noticeable at heater unit.
12. Repeat step 11 three times.
13. If sound is heard, bleed air from cooling system by repeating step 4 through 7 until engine coolant level no
longer drops.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-129,
"ASSEMBLY" .
2. Remove air relief plug on heater hose.
3. Fill radiator with water until water spills from the air relief hole, then close air relief plug. Fill radiator and
reservoir tank with water and reinstall radiator cap.Reservoir tank engine coolant capacity
(At “MAX” level)
: 0.8 (7/8 US qt, 3/4 lmp qt)
Air relief plug:
: 1.2 N·m (0.12 kg-m, 11 ft-lb)
SMA412B
Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
SBIA0445E

ENGINE MAINTENANCE (VK45DE ENGINE)
MA-23
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Revision: 2007 April2007 M35/M45
When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer
to EM-253, "
DISASSEMBLY" .
4. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
5. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to MA-24, "
FLUSHING COOLING SYSTEM" .
REFILLING ENGINE COOLANT
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean radiator drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-257,
"ASSEMBLY" .
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air relief plug (1) on heater hose.
4. Fill thermostat housing and reservoir tank to specified level.

Refill engine coolant up to filler neck of thermostat housing.

Pour engine coolant through engine coolant filler neck slowly of less than 2 (2-1/8 US qt, 1-3/4
Imp qt) a minute to allow air in system to escape.

Use genuine NISSAN Long Life Antifreeze/Coolant or equivalent mixed with water (distilled or
demineralized). Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRICANTS" .
1 : Radiator drain plug hole
2 : Front engine undercover
: Engine front
PBIC3395E
Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
: Engine front
PBIC3394E
Engine coolant capacity
(With reservoir tank at “MAX” level):
Approx. 10.4 (11 US qt, 9-1/8 Imp qt)