overheating INFINITI QX56 2004 Factory Service Manual
[x] Cancel search | Manufacturer: INFINITI, Model Year: 2004, Model line: QX56, Model: INFINITI QX56 2004Pages: 3371, PDF Size: 78.5 MB
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TROUBLE DIAGNOSIS
ATC-117
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AT C
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Insufficient HeatingEJS002CN
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1 .ATC-56, "Operational Check
(Front)" or AT C - 5 9 , "Operational
Check (Rear)"
*2AT C - 6 7 , "Air Mix Door Motor Circuit"*3AT C - 5 3 , "A/C System Self-diagno-
sis Function"
*4AT C - 5 3 , "A/C System Self-diagnosis
Function"
*5AT C - 8 3 , "Front Blower Motor Circuit"*6EC-165, "DTC P0117, P0118 ECT
SENSOR"
*7MA-12, "Changing Engine Coolant"*8CO-8, "CHECKING RESERVOIR
CAP"
*9ATC-121, "Water Valve Circuit"
*10CO-4, "OVERHEATING CAUSE
ANALYSIS"
WJIA0812E
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CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
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SECTION CO
A
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Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
PREPARATION ........................................................... 3
Special Service Tools ............................................... 3
Commercial Service Tools ........................................ 3
OVERHEATING CAUSE ANALYSIS .......................... 4
Troubleshooting Chart .............................................. 4
COOLING SYSTEM .................................................... 6
Cooling Circuit .......................................................... 6
System Drawing ....................................................... 7
ENGINE COOLANT .................................................... 8
Inspection ................................................................. 8
LEVEL CHECK ..................................................... 8
CHECKING COOLING SYSTEM FOR LEAKS ..... 8
CHECKING RESERVOIR CAP ............................. 8
CHECKING RADIATOR CAP ................................ 8
Changing Engine Coolant ........................................ 8
DRAINING ENGINE COOLANT ........................... 8
REFILLING ENGINE COOLANT .......................... 9
FLUSHING COOLING SYSTEM ........................... 9
RADIATOR ................................................................ 10
Removal and Installation ........................................ 10
REMOVAL ........................................................... 10
INSTALLATION ................................................... 12
INSPECTION AFTER INSTALLATION ............... 12
Checking Radiator .................................................. 12ENGINE COOLING FAN ........................................... 13
Removal and Installation (Crankshaft Driven Type) ... 13
REMOVAL ........................................................... 13
INSPECTION AFTER REMOVAL ....................... 13
INSTALLATION ................................................... 13
INSPECTION AFTER INSTALLATION ................ 13
Removal and Installation (Motor Driven Type) ....... 14
REMOVAL ........................................................... 14
INSTALLATION ................................................... 14
WATER PUMP .......................................................... 15
Removal and Installation ........................................ 15
REMOVAL ........................................................... 15
INSPECTION AFTER REMOVAL ....................... 15
INSTALLATION ................................................... 15
INSPECTION AFTER INSTALLATION ................ 16
THERMOSTAT AND WATER PIPING ...................... 17
Removal and Installation ........................................ 17
REMOVAL ........................................................... 17
INSPECTION AFTER REMOVAL ....................... 18
INSTALLATION ................................................... 18
INSPECTION AFTER INSTALLATION ................ 18
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 19
Standard and Limit .................................................. 19
ENGINE COOLANT CAPACITY (APPROXI-
MATE) .................................................................. 19
THERMOSTAT .................................................... 19
RADIATOR .......................................................... 19
Page 1087 of 3371
CO-4Revision: August 2007
OVERHEATING CAUSE ANALYSIS
2004 QX56
OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartEBS00I4T
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.)
Water cut valve malfunctionExcess foreign material
(rust, dirt, sand, etc.), phys-
ical damage
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
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OVERHEATING CAUSE ANALYSIS
CO-5
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Revision: August 20072004 QX56
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
Page 1196 of 3371
EC-5
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ECA
Revision: August 20072004 QX56 Overall Function Check ........................................ 396
Wiring Diagram .................................................... 398
Diagnostic Procedure ........................................... 401
Component Inspection ......................................... 404
Removal and Installation ...................................... 406
DTC P1148, P1168 CLOSED LOOP CONTROL .... 407
On Board Diagnosis Logic ................................... 407
DTC P1211 TCS CONTROL UNIT ......................... 408
Description ........................................................... 408
On Board Diagnosis Logic ................................... 408
DTC Confirmation Procedure ............................... 408
Diagnostic Procedure ........................................... 408
DTC P1212 TCS COMMUNICATION LINE ............ 409
Description ........................................................... 409
On Board Diagnosis Logic ................................... 409
DTC Confirmation Procedure ............................... 409
Diagnostic Procedure ........................................... 409
DTC P1217 ENGINE OVER TEMPERATURE ....... 410
Description ........................................................... 410
CONSULT-II Reference Value in Data Monitor Mode
. 410
On Board Diagnosis Logic .................................... 411
Overall Function Check ......................................... 411
Wiring Diagram .................................................... 413
Diagnostic Procedure ........................................... 415
Main 12 Causes of Overheating ........................... 418
Component Inspection ......................................... 419
DTC P1225 TP SENSOR ........................................ 420
Component Description ........................................ 420
On Board Diagnosis Logic ................................... 420
DTC Confirmation Procedure ............................... 420
Diagnostic Procedure ........................................... 421
Removal and Installation ...................................... 421
DTC P1226 TP SENSOR ........................................ 422
Component Description ........................................ 422
On Board Diagnosis Logic ................................... 422
DTC Confirmation Procedure ............................... 422
Diagnostic Procedure ........................................... 423
Removal and Installation ...................................... 423
DTC P1229 SENSOR POWER SUPPLY ................ 424
On Board Diagnosis Logic ................................... 424
DTC Confirmation Procedure ............................... 424
Wiring Diagram .................................................... 425
Diagnostic Procedure ........................................... 426
DTC P1271, P1281 A/F SENSOR 1 ....................... 429
Component Description ........................................ 429
CONSULT-II Reference Value in Data Monitor Mode
. 429
On Board Diagnosis Logic ................................... 429
DTC Confirmation Procedure ............................... 429
Wiring Diagram .................................................... 431
Diagnostic Procedure ........................................... 434
Removal and Installation ...................................... 436
DTC P1272, P1282 A/F SENSOR 1 ....................... 437
Component Description ........................................ 437
CONSULT-II Reference Value in Data Monitor Mode
. 437
On Board Diagnosis Logic ................................... 437
DTC Confirmation Procedure ............................... 437Wiring Diagram .....................................................439
Diagnostic Procedure ...........................................442
Removal and Installation ......................................444
DTC P1273, P1283 A/F SENSOR 1 .......................445
Component Description ........................................445
CONSULT-II Reference Value in Data Monitor Mode
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On Board Diagnosis Logic ....................................445
DTC Confirmation Procedure ...............................445
Wiring Diagram .....................................................447
Diagnostic Procedure ...........................................450
Removal and Installation ......................................453
DTC P1274, P1284 A/F SENSOR 1 .......................454
Component Description ........................................454
CONSULT-II Reference Value in Data Monitor Mode
.454
On Board Diagnosis Logic ....................................454
DTC Confirmation Procedure ...............................454
Wiring Diagram .....................................................456
Diagnostic Procedure ...........................................459
Removal and Installation ......................................462
DTC P1276, P1286 A/F SENSOR 1 .......................463
Component Description ........................................463
CONSULT-II Reference Value in Data Monitor Mode
.463
On Board Diagnosis Logic ....................................463
DTC Confirmation Procedure ...............................463
Overall Function Check ........................................464
Wiring Diagram .....................................................466
Diagnostic Procedure ...........................................469
Removal and Installation ......................................471
DTC P1278, P1288 A/F SENSOR 1 .......................472
Component Description ........................................472
CONSULT-II Reference Value in Data Monitor Mode
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On Board Diagnosis Logic ....................................472
DTC Confirmation Procedure ...............................473
Wiring Diagram .....................................................475
Diagnostic Procedure ...........................................478
Removal and Installation ......................................483
DTC P1279, P1289 A/F SENSOR 1 .......................484
Component Description ........................................484
CONSULT-II Reference Value in Data Monitor Mode
.484
On Board Diagnosis Logic ....................................484
DTC Confirmation Procedure ...............................485
Wiring Diagram .....................................................487
Diagnostic Procedure ...........................................490
Removal and Installation ......................................495
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE ...............................496
Description ............................................................496
CONSULT-II Reference Value in Data Monitor Mode
.496
On Board Diagnosis Logic ....................................497
DTC Confirmation Procedure ...............................497
Wiring Diagram .....................................................498
Diagnostic Procedure ...........................................500
Page 1602 of 3371
DTC P1217 ENGINE OVER TEMPERATURE
EC-411
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On Board Diagnosis LogicUBS00H8V
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-8, "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 CheckUBS00H8W
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WA RN ING:
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.
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-415,
"Diagnostic Procedure" .
2. Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to EC-415,
"Diagnostic Procedure" .
3. Turn ignition switch ON.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1217
1217Engine over tempera-
ture (Overheat)
Cooling fan does not operate properly (Over-
heat).
Cooling fan system does not operate prop-
erly (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.)
Cooling fan
Radiator hose
Radiator
Radiator cap
Water pump
Thermostat
For more information, refer to EC-418,
"Main 12 Causes of Overheating" .
SEF 6 21 W
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DTC P1217 ENGINE OVER TEMPERATURE
EC-417
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8. CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to EC-418, "
Main 12 Causes of Overheating" .
>>INSPECTION END
PROCEDURE A
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E120.
3. Check voltage between IPDM E/R terminal 24 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.
40A fusible link
Harness for open or short between IPDM E/R and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN OR SHORT
1. Disconnect cooling fan motor harness connector.
2. Check harness continuity between cooling fan motor terminal 1
and IPDM E/R terminal 24, cooling fan motor terminal 2 and
body ground.
Refer to wiring diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4. CHECK COOLING FAN MOTOR
Refer to EC-419, "
Component Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Replace cooling fan motor.Voltage: Battery voltage
WBIA0532E
Continuity should exist.
BBIA0446E
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EC-418Revision: August 2007
DTC P1217 ENGINE OVER TEMPERATURE
2004 QX56
5. CHECK INTERMITTENT INCIDENT
Perform EC-127, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R. Refer to PG-17, "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MOD-
ULE ENGINE ROOM)" .
NG >> Repair or replace harness connectors.
Main 12 Causes of OverheatingUBS00H8Z
*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-4, "
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 mixtureCoolant tester 50 - 50% coolant mixtureMA-10, "RECOM-
MENDED FLUIDS AND
LUBRICANTS"
3Coolant levelVisual Coolant up to MAX level
in reservoir tank and radi-
ator filler neckCO-8, "Changing Engine
Coolant"
4Radiator capPressure tester 59 - 98 kPa
(0.6 - 1.0 kg/cm2 , 9 - 14
psi) (Limit)CO-8, "
CHECKING RES-
ERVOIR CAP"
ON*25Coolant leaksVisual No leaksCO-8, "CHECKING
COOLING SYSTEM FOR
LEAKS"
ON*26ThermostatTouch the upper and
lower radiator hosesBoth hoses should be hotCO-17, "THERMOSTAT
AND WATER PIPING"
ON*17Cooling fanCONSULT-II Operating See trouble diagnosis for
DTC P1217 (EC-410,
"DTC P1217 ENGINE
OVER TEMPERA-
TURE" ).
OFF 8
Combustion gas leakColor checker chemical
tester 4 Gas analyzerNegative —
ON*
39Coolant temperature
gaugeVisual Gauge less than 3/4
when driving—
Coolant overflow to
reservoir tankVisual No overflow during driving
and idlingCO-8, "Changing Engine
Coolant"
OFF*410Coolant return from
reservoir tank to radia-
torVisual Should be initial level in
reservoir tankCO-8, "Changing Engine
Coolant"
OFF 11Cylinder headStraight gauge feeler
gauge0.1 mm (0.004 in) Maxi-
mum distortion (warping)EM-64, "Inspection After
Disassembly"
12Cylinder block and pis-
tonsVisual No scuffing on cylinder
walls or pistonEM-89, "Inspection After
Disassembly"