2006 INFINITI M35 heating

OVERHEATING CAUSE ANALYSIS
CO-7
[VQ35DE]
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Revision: 2006 January2006 M35/M45
OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartNBS004QN
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-
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 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-8
[VQ35DE]
OVERHEATING CAUSE ANALYSIS
Revision: 2006 January2006 M35/M45
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

CO-36
[VK45DE]
OVERHEATING CAUSE ANALYSIS
Revision: 2006 January2006 M35/M45
OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartNBS004RB
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 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

OVERHEATING CAUSE ANALYSIS
CO-37
[VK45DE]
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Revision: 2006 January2006 M35/M45
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

CO-56
[VK45DE]
THERMOSTAT AND WATER CONTROL VALVE
Revision: 2006 January2006 M35/M45
5. Disconnect water suction hose from water inlet.
6. Remove water inlet and thermostat.
CAUTION:
Do not disassemble thermostat.
7. Remove intake manifolds (upper and lower). Refer to EM-179, "
INTAKE MANIFOLD" .
8. Disconnect radiator hose (upper) from thermostat housing.
9. Disconnect heater hoses from water outlet and heater pipe.
10. Remove thermostat housing, water outlet pipe, water connector, water control valve, water outlet and
heater pipe.
CAUTION:
Do not disassemble water control valve.
INSPECTION AFTER REMOVAL
Make sure that valves both in thermostat and water control valve are completely closing at normal tempar-
ature.
Place a thread so that it is caught in the valves of the thermostat
and water control valve. Immerse fully in a container filled with
water. Heat while stirring. (The example in the figure shows ther-
mostat.)
The valve opening temperature is the temperature at which the
valve opens and falls from the thread.
Continue heating. Check the maximum valve lift.
NOTE:
The maximum valve lift standard temperature for water control
valve is the reference value.
After checking the maximum valve lift, lower the water tempera-
ture and check the valve closing temperature.
Standard values:
If the malfunctioning condition, when closing valve at normal temperature, or measured values are out of
the standard, replace thermostat and/or water control valve.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.
Thermostat and Water Control Valve
Install thermostat and water control valve with the whole circum-
ference of each flange part fit securely inside rubber ring. (The
example in the figure shows thermostat.)
SLC252B
Thermostat Water control valve
Valve opening temperature 80 - 84
C (176 - 183F) 93.5 - 96.5C (200 - 206F)
Maximum valve liftMore than 10 mm/ 95
C
(0.39 in/ 203
F)More than 8 mm/ 108
C
(0.315 in/ 226
F)
Valve closing temperature 77
C (171F) 90C (194F)
PBIC0157E

EC-5
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ECA
Revision: 2006 January2006 M35/M45 DTC Confirmation Procedure ...............................451
Wiring Diagram ....................................................452
Diagnostic Procedure ...........................................453
Component Inspection .........................................457
DTC P0455 EVAP CONTROL SYSTEM ................458
On Board Diagnosis Logic ...................................458
DTC Confirmation Procedure ...............................459
Diagnostic Procedure ...........................................460
DTC P0456 EVAP CONTROL SYSTEM ................466
On Board Diagnosis Logic ...................................466
DTC Confirmation Procedure ...............................467
Overall Function Check ........................................468
Diagnostic Procedure ...........................................469
DTC P0460 FUEL LEVEL SENSOR ......................475
Component Description ........................................475
On Board Diagnosis Logic ...................................475
DTC Confirmation Procedure ...............................475
Diagnostic Procedure ...........................................476
Removal and Installation ......................................476
DTC P0461 FUEL LEVEL SENSOR ......................477
Component Description ........................................477
On Board Diagnosis Logic ...................................477
Overall Function Check ........................................477
Diagnostic Procedure ...........................................478
Removal and Installation ......................................478
DTC P0462, P0463 FUEL LEVEL SENSOR CIR-
CUIT ........................................................................479
Component Description ........................................479
On Board Diagnosis Logic ...................................479
DTC Confirmation Procedure ...............................479
Diagnostic Procedure ...........................................480
Removal and Installation ......................................480
DTC P0500 VSS .....................................................481
Description ...........................................................481
On Board Diagnosis Logic ...................................481
DTC Confirmation Procedure ...............................481
Overall Function Check ........................................482
Diagnostic Procedure ...........................................482
DTC P0506 ISC SYSTEM .......................................483
Description ...........................................................483
On Board Diagnosis Logic ...................................483
DTC Confirmation Procedure ...............................483
Diagnostic Procedure ...........................................484
DTC P0507 ISC SYSTEM .......................................485
Description ...........................................................485
On Board Diagnosis Logic ...................................485
DTC Confirmation Procedure ..............................
.485
Diagnostic Procedure ...........................................486
DTC P0550 PSP SENSOR .....................................487
Component Description ........................................487
CONSULT-II Reference Value in Data Monitor Mode
.487
On Board Diagnosis Logic ...................................487
DTC Confirmation Procedure ...............................487
Wiring Diagram ....................................................488
Diagnostic Procedure ...........................................489
Component Inspection .........................................491
Removal and Installation ......................................491DTC P0603 ECM POWER SUPPLY .......................492
Component Description ........................................492
On Board Diagnosis Logic ....................................492
DTC Confirmation Procedure ...............................492
Wiring Diagram .....................................................493
Diagnostic Procedure ...........................................494
DTC P0605 ECM .....................................................496
Component Description ........................................496
On Board Diagnosis Logic ....................................496
DTC Confirmation Procedure ...............................496
Diagnostic Procedure ...........................................497
DTC P0643 SENSOR POWER SUPPLY ................499
On Board Diagnosis Logic ....................................499
DTC Confirmation Procedure ...............................499
Wiring Diagram .....................................................500
Diagnostic Procedure ...........................................502
DTC P0850 PNP SWITCH ......................................504
Component Description ........................................504
CONSULT-II Reference Value in Data Monitor Mode
.504
On Board Diagnosis Logic ....................................504
DTC Confirmation Procedure ...............................504
Overall Function Check ........................................505
Wiring Diagram .....................................................506
Diagnostic Procedure ...........................................507
DTC P1148, P1168 CLOSED LOOP CONTROL ....509
On Board Diagnosis Logic ....................................509
DTC P1211 TCS CONTROL UNIT ..........................510
Description ............................................................510
On Board Diagnosis Logic ....................................510
DTC Confirmation Procedure ...............................510
Diagnostic Procedure ...........................................510
DTC P1212 TCS COMMUNICATION LINE ............511
Description ............................................................511
On Board Diagnosis Logic ....................................511
DTC Confirmation Procedure ...............................511
Diagnostic Procedure ...........................................511
DTC P1217 ENGINE OVER TEMPERATURE .......
.512
Description ............................................................512
CONSULT-II Reference Value in Data Monitor Mode
.513
On Board Diagnosis Logic ....................................513
Overall Function Check ........................................513
Wiring Diagram .....................................................515
Diagnostic Procedure ...........................................517
Main 12 Causes of Overheating ...........................522
Component Inspection ..........................................524
DTC P1220 FUEL PUMP CONTROL MODULE
(FPCM) ....................................................................525
Description ............................................................525
CONSULT-II Reference Value in Data Monitor Mode
.525
On Board Diagnosis Logic ....................................525
DTC Confirmation Procedure ...............................526
Wiring Diagram .....................................................527
Diagnostic Procedure ...........................................528
Component Inspection ..........................................532
DTC P1225 TP SENSOR ........................................533
Component Description ........................................533

EC-12Revision: 2006 January2006 M35/M45 Wiring Diagram ....................................................11 7 2
Diagnostic Procedure ..........................................11 7 3
Component Inspection .........................................11 7 7
DTC P0455 EVAP CONTROL SYSTEM ................117 8
On Board Diagnosis Logic ...................................11 7 8
DTC Confirmation Procedure ..............................11 7 9
Diagnostic Procedure ..........................................11 8 0
DTC P0456 EVAP CONTROL SYSTEM ................118 5
On Board Diagnosis Logic ...................................11 8 5
DTC Confirmation Procedure ..............................11 8 6
Overall Function Check .......................................11 8 7
Diagnostic Procedure ..........................................11 8 8
DTC P0460 FUEL LEVEL SENSOR ......................119 4
Component Description .......................................11 9 4
On Board Diagnosis Logic ...................................11 9 4
DTC Confirmation Procedure ..............................11 9 4
Diagnostic Procedure ..........................................11 9 5
Removal and Installation .....................................11 9 5
DTC P0461 FUEL LEVEL SENSOR ......................119 6
Component Description .......................................11 9 6
On Board Diagnosis Logic ...................................11 9 6
Overall Function Check .......................................11 9 6
Diagnostic Procedure ..........................................11 9 7
Removal and Installation .....................................11 9 7
DTC P0462, P0463 FUEL LEVEL SENSOR CIR-
CUIT .......................................................................119 8
Component Description .......................................11 9 8
On Board Diagnosis Logic ...................................11 9 8
DTC Confirmation Procedure ..............................11 9 8
Diagnostic Procedure ..........................................11 9 9
Removal and Installation .....................................11 9 9
DTC P0500 VSS .....................................................1200
Description ...........................................................1200
On Board Diagnosis Logic ...................................1200
DTC Confirmation Procedure ..............................1200
Overall Function Check .......................................1201
Diagnostic Procedure ..........................................1201
DTC P0506 ISC SYSTEM ......................................1202
Description ...........................................................1202
On Board Diagnosis Logic ...................................1202
DTC Confirmation Procedure ..............................1202
Diagnostic Procedure ..........................................1203
DTC P0507 ISC SYSTEM ......................................1204
Description ...........................................................1204
On Board Diagnosis Logic ...................................1204
DTC Confirmation Procedure ..............................1204
Diagnostic Procedure ..........................................1205
DTC P0550 PSP SENSOR .....................................
1206
Component Description .......................................1206
CONSULT-II Reference Value in Data Monitor Mode
1206
On Board Diagnosis Logic ...................................1206
DTC Confirmation Procedure ..............................1206
Wiring Diagram ....................................................1207
Diagnostic Procedure ..........................................1208
Component Inspection .........................................1210
Removal and Installation .....................................1210
DTC P0603 ECM POWER SUPPLY ......................1211
Component Description .......................................1211On Board Diagnosis Logic ...................................1211
DTC Confirmation Procedure ...............................1211
Wiring Diagram ....................................................1212
Diagnostic Procedure ........................................... 1213
DTC P0605 ECM ....................................................1215
Component Description .......................................1215
On Board Diagnosis Logic ...................................1215
DTC Confirmation Procedure ...............................1215
Diagnostic Procedure ........................................... 1216
DTC P0643 SENSOR POWER SUPPLY ...............1218
On Board Diagnosis Logic ...................................1218
DTC Confirmation Procedure ...............................1218
Wiring Diagram ....................................................1219
Diagnostic Procedure ........................................... 1221
DTC P0850 PNP SWITCH ......................................1223
Component Description .......................................1223
CONSULT-II Reference Value in Data Monitor Mode
1223
On Board Diagnosis Logic ...................................1223
DTC Confirmation Procedure ...............................1223
Overall Function Check ........................................1224
Wiring Diagram ....................................................1225
Diagnostic Procedure ........................................... 1226
DTC P1140, P1145 IVT CONTROL POSITION SEN-
SOR ........................................................................1228
Component Description .......................................1228
CONSULT-II Reference Value in Data Monitor Mode
1228
On Board Diagnosis Logic ...................................1228
DTC Confirmation Procedure ...............................1228
Wiring Diagram ....................................................1229
Diagnostic Procedure ........................................... 1232
Component Inspection .........................................1235
Removal and Installation ......................................1235
DTC P1148, P1168 CLOSED LOOP CONTROL ...1236
On Board Diagnosis Logic ...................................1236
DTC P1211 TCS CONTROL UNIT .........................1237
Description ...........................................................1237
On Board Diagnosis Logic ...................................1237
DTC Confirmation Procedure ...............................1237
Diagnostic Procedure ........................................... 1237
DTC P1212 TCS COMMUNICATION LINE ............1238
Description ...........................................................1238
On Board Diagnosis Logic ...................................1238
DTC Confirmation Procedure ...............................1238
Diagnostic Procedure ........................................... 1238
DTC P1217 ENGINE OVER TEMPERATURE .......1239
Description ...........................................................1239
CONSULT-II Reference Value in Data Monitor Mode
1240
On Board Diagnosis Logic ...................................1240
Overall Function Check ........................................1240
Wiring Diagram ....................................................1242
Diagnostic Procedure ........................................... 1244
Main 13 Causes of Overheating ..........................1249
Component Inspection .........................................1249
DTC P1220 FUEL PUMP CONTROL MODULE
(FPCM) ...................................................................1251
Description ...........................................................1251

EC-348
[VQ35DE]
DTC P0181 FTT SENSOR
Revision: 2006 January2006 M35/M45
Component InspectionNBS004Y5
FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 4 and 5 by heating with hot water or heat gun as
shown in the figure.
Removal and InstallationNBS004Y6
FUEL TANK TEMPERATURE SENSOR
Refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .
Temperature C (F) Resistance k
20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
PBIB0931E