2006 INFINITI QX56 check engine

AT-218
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
9. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.17).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
Vehicle Does Not Decelerate By Engine BrakeECS00CKN
SYMPTOM:
No engine brake is applied when the gear is shifted from the 22 to 11 .
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis.
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 5?
YES >> Check the malfunctioning system. Refer to AT- 1 0 5 , "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" , AT- 1 6 3 , "DTC P1845 ATF PRESSURE SWITCH 5" .
NO >> GO TO 2.
2. CHECK 1ST POSITION SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch “ ON”.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out "1 POSITION SW" moving switch selector lever to each position.
Without CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Monitor item Condition Display value
1 POSITION SW When setting the selector
lever to "1" position.
ON
When setting selector
lever to other positions. OFF
LCIA0339E
Item Connector No. Terminal No. Condition Data
(Approx.)
1st position switch M203 7 - Ground When setting
the selector
lever to "1"
position.
0V
When setting
selector lever
to other posi-
tions. Battery volt-
age
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SHIFT CONTROL SYSTEMAT-227
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Revision: November 2009 2006 QX56
REMOVAL
1. Remove negative battery terminal. Refer to SC-4, "BATTERY" .
2. Remove A/T finisher. Refer to IP-13, "
A/T FINISHER" .
3. Disconnect selector control cable.
4. Disconnect A/T device harness connector.
5. Remove control device assembly.
INSTALLATION
Installation is in reverse order of removal. Be careful of the following:

After installation is completed, adjust and check A/T position.
Adjustment of A/T PositionECS00EO0
1. Loosen nut of control cable.
2. Place PNP switch and selector lever in “P” position.
3. After pushing the control cable in the direction shown with a force of 9.8 N ·m (1kg-m, 2.2 lb-ft), release it. This is in the natu-
ral state, tighten control cable nut to specifications.
Checking of A/T PositionECS00EO1
1. Place selector lever in “P” position, and turn ignition switch ON
(engine stop).
2. Make sure selector lever can be shifted to other than “P” posi-
tion when brake pedal is depressed. Also make sure selector
lever can be shifted from “P” position only when brake pedal is
depressed.
3. Move the selector lever and check for excessive effort, sticking, noise or rattle.
4. Confirm the selector lever stops at each position with the feel of engagement when it is moved through all the positions. Check
whether or not the actual position the selector lever is in
matches the position shown by the shift position indicator and
the transmission body.
5. The method of operating the lever to individual positions correctly should be as shown.
6. Confirm the back-up lamps illuminate only when lever is placed in the “R” position. Confirm the back-up
lamps does not illuminate when selector lever is pushed against “R” position in the “P” or “N” position.
7. Confirm the engine can only be started with the selector lever in the “P” and “N” positions.
8. Make sure transmission is locked completely in “P” position.
Control cable nut : 14.5 N·m (1.5 kg-m, 11 ft-lb)
LCIA0345E
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AT-244
TRANSMISSION ASSEMBLY
Revision: November 20092006 QX56
8. Remove crankshaft position sensor (POS) from A/T assembly.
CAUTION:

Do not subject it to impact by dropping or hitting it.

Do not disassemble.

Do not allow metal filings or foreign material to get on the
sensor front edge magnetic area.

Do not place in an area affected by magnetism.
9. Remove fluid cooler tube.
10. Remove dust cover from converter housing.
11. Turn crankshaft to access and remove the four bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
12. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission jack, be careful not to allow
it to collide against the drain plug.
13. Remove cross member using power tool.
14. Remove air breather hose. Refer to AT- 2 4 1 , "
Removal and
Installation" .
15. Disconnect A/T assembly connector.
16. Remove A/T fluid indicator pipe from A/T assembly.
17. Plug any openings such as the A/T fluid indicator pipe hole.
18. Remove the A/T assembly to engine bolts using power tool.
19. Remove A/T assembly from vehicle using transmission jack. CAUTION:

Secure torque converter to prevent it from dropping.

Secure A/T assembly to a transmission jack.
INSPECTION
Installation and Inspection of Torque Converter

After inserting a torque converter to a transmission, be sure to
check dimension A to ensure it is within specifications.
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Dimension A : 24.0 mm (0.94 in) or more
SAT017B

TRANSMISSION ASSEMBLYAT-245
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INSTALLATION
Installation of the remaining components is in the reverse order of the removal, while paying attention to the
following:

When installing transmission to the engine, attach the bolts as shown.
NOTE:
*: No.2 bolt also secures air breather vent.
CAUTION:

When replacing an engine or transmission you must
make sure the dowels are installed correctly during re-
assembly.

Improper alignment caused by missing dowels may
cause vibration, oil leaks or breakage of drivetrain com-
ponents.

Align the positions of bolts for drive plate with those of the torque
converter, and temporarily tighten the bolts. Then tighten the
bolts with the specified torque.
CAUTION:

When turning crankshaft, turn it clockwise as viewed from
the front of the engine.

After converter is installed to drive plate, rotate crankshaft
several turns and check to be sure that transmission
rotates freely without binding.

Install crankshaft position sensor (POS).

After completing installation check fluid leakage, fluid level and
the positions of A/T. Refer to AT- 1 2 , "
Checking Automatic Transmission Fluid (ATF)" , AT- 2 2 7 , "Checking
of A/T Position" and AT- 2 2 7 , "Adjustment of A/T Position" .
Transmission to engine bolts : 113 N·m (12 kg-m,
83 ft-lb)
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TRANSMISSION ASSEMBLYAT-249
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Revision: November 2009 2006 QX56
INSTALLATION
Installation of the remaining components is in the reverse order of removal, while paying attention to the fol-
lowing:

When installing transmission to the engine, attach the bolts as shown.
NOTE:
*: No.2 bolt also secures air breather vent.
CAUTION:

When replacing an engine or transmission you must
make sure the dowels are installed correctly during re-
assembly.

Improper alignment caused by missing dowels may
cause vibration, oil leaks or breakage of drivetrain com-
ponents.

Align the positions of bolts for drive plate with those of the torque
converter, and temporarily tighten the bolts. Then tighten the
bolts with the specified torque.
CAUTION:

When turning crankshaft, turn it clockwise as viewed from
the front of the engine.

After converter is installed to drive plate, rotate crankshaft
several turns and check to be sure that transmission
rotates freely without binding.

Install crankshaft position sensor (POS).

After completing installation, check fluid leakage, fluid level, and
the positions of A/T. Refer to AT- 1 2 , "
Checking Automatic Transmission Fluid (ATF)" , AT- 2 2 7 , "Checking
of A/T Position" and AT- 2 2 7 , "Adjustment of A/T Position" .
Transmission to engine bolts : 113 N·m (12 kg-m,
83 ft-lb)
LCIA0371E
LCIA0335E

ATC-2Revision: November 20092006 QX56
CONSULT-II BASIC OPERATION ....................
... 34
SELF-DIAGNOSIS ........................................... ... 35
DATA MONITOR ............................................... ... 35
CONSULT-II Function (BCM) ............................... ... 37
CONSULT-II BASIC OPERATION .................... ... 37
DATA MONITOR ............................................... ... 38
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ................................................... ... 39
WORK FLOW ................................................... ... 39
SYMPTOM TABLE ........................................... ... 39
Component Parts and Harness Connector Location ... 40
ENGINE COMPARTMENT ............................... ... 40
FRONT PASSENGER COMPARTMENT ......... ... 41
REAR PASSENGER COMPARTMENT ............... 42
Schematic ............................................................ ... 43
Wiring Diagram — A/C,A — ................................ ... 44
Front Air Control Terminals and Reference Value ... 54
PIN CONNECTOR TERMINAL LAYOUT ......... ... 54
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL .................................... ... 54
A/C System Self-diagnosis Function ................... ... 56
DESCRIPTION ................................................. ... 56
Operational Check (Front) ................................... ... 58
CHECKING MEMORY FUNCTION .................. ... 58
CHECKING BLOWER ...................................... ... 58
CHECKING DISCHARGE AIR ......................... ... 58
CHECKING RECIRCULATION (, ONLY) .......... ... 58
CHECKING TEMPERATURE DECREASE ...... ... 58
CHECKING TEMPERATURE INCREASE ....... ... 59
CHECK A/C SWITCH ....................................... ... 59
CHECKING AUTO MODE ................................ ... 59
Operational Check (Rear) .................................... ... 60
CHECKING BLOWER ...................................... ... 60
CHECKING TEMPERATURE DECREASE ...... ... 60
CHECKING TEMPERATURE INCREASE ....... ... 60
Power Supply and Ground Circuit for Front Air Con-
trol ........................................................................ ... 61
INSPECTION FLOW ........................................ ... 61
COMPONENT DESCRIPTION ......................... ... 62
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 62
Mode Door Motor Circuit ........................................ 64 INSPECTION FLOW ........................................ ... 64
SYSTEM DESCRIPTION ................................. ... 65
COMPONENT DESCRIPTION ......................... ... 66
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................ ... 66
Air Mix Door Motor Circuit ................................... ... 70
INSPECTION FLOW ........................................ ... 70
SYSTEM DESCRIPTION ................................. ... 71
COMPONENT DESCRIPTION ......................... ... 72
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (DRIVER) ................................ ... 72
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (PASSENGER) ....................... ... 76
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (REAR) ................................... ... 79
Intake Door Motor Circuit ..................................... ... 83
INSPECTION FLOW ........................................ ... 83
SYSTEM DESCRIPTION ................................. ... 84COMPONENT DESCRIPTION .........................
... 85
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR ................................................. ... 85
Defroster Door Motor Circuit ................................ ... 87
SYMPTOM: ....................................................... ... 87
INSPECTION FLOW ......................................... ... 87
SYSTEM DESCRIPTION .................................. ... 88
COMPONENT DESCRIPTION ......................... ... 88
DIAGNOSTIC PROCEDURE FOR
DEFROSTER DOOR MOTOR .......................... ... 89
Front Blower Motor Circuit ................................... ... 93
INSPECTION FLOW ......................................... ... 93
SYSTEM DESCRIPTION .................................. ... 94
COMPONENT DESCRIPTION ......................... ... 95
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ............................................................. ... 95
COMPONENT INSPECTION ............................ .100
Rear Blower Motor Circuit .................................... .101
INSPECTION FLOW ......................................... .101
SYSTEM DESCRIPTION .................................. .102
DIAGNOSTIC PROCEDURE FOR REAR
BLOWER MOTOR ............................................ .102
COMPONENT INSPECTION ............................ .110
Rear Air Control Circuit ........................................ .112
INSPECTION FLOW ......................................... .112
SYSTEM DESCRIPTION .................................. .113
DIAGNOSTIC PROCEDURE FOR REAR AIR
CONTROL ........................................................ .113
Magnet Clutch Circuit ........................................... .115
INSPECTION FLOW ......................................... .115
SYSTEM DESCRIPTION .................................. .116
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ........................................................... .116
Insufficient Cooling ............................................... .121
INSPECTION FLOW ......................................... .121
PERFORMANCE TEST DIAGNOSES ............. .122
PERFORMANCE CHART ................................. .124
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE ................................................................ .125
Insufficient Heating .............................................. .128
INSPECTION FLOW ......................................... .128
Noise .................................................................... .129
INSPECTION FLOW ......................................... .129
Self-diagnosis ...................................................... .130
INSPECTION FLOW ......................................... .130
Memory Function ................................................. .131
INSPECTION FLOW ......................................... .131
Water Valve Circuit ............................................... .132
COMPONENT DESCRIPTION ......................... .132
DIAGNOSTIC PROCEDURE FOR WATER
VALVE ............................................................... .132
Ambient Sensor Circuit ........................................ .134
COMPONENT DESCRIPTION ......................... .134
AMBIENT TEMPERATURE INPUT PROCESS .134
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ........................................................... .134
COMPONENT INSPECTION ............................ .136
In-vehicle Sensor Circuit ...................................... .137
COMPONENT DESCRIPTION ......................... .137

ATC-4Revision: November 20092006 QX56
Removal and Installation for Low-pressure Pipe .
.180
REMOVAL ........................................................ .180
INSTALLATION ................................................. .180
Removal and Installation for Rear High- and Low-
pressure A/C and Heater Core Pipes .................. .180
REMOVAL ........................................................ .180
INSTALLATION ................................................. .181
Removal and Installation for Underfloor Rear High-
and Low-pressure A/C and Heater Core Pipes ... .181
REMOVAL ........................................................ .181
INSTALLATION ................................................. .182
Removal and Installation for Refrigerant Pressure
Sensor ................................................................. .182
REMOVAL ........................................................ .182
INSTALLATION ................................................. .182
Removal and Installation for Condenser .............. .182
REMOVAL ........................................................ .182
INSTALLATION ................................................. .183
Removal and Installation for Front Evaporator .... .184
REMOVAL ........................................................ .184
INSTALLATION ................................................. .185
Removal and Installation for Rear Evaporator ..... .185
REMOVAL ........................................................ .186INSTALLATION .................................................
.186
Removal and Installation for Front Expansion Valve .186
REMOVAL ......................................................... .186
INSTALLATION ................................................. .186
Removal and Installation for Rear Expansion Valve .186
REMOVAL ......................................................... .186
INSTALLATION ................................................. .187
Checking for Refrigerant Leaks ........................... .187
PRELIMINARY CHECK .................................... .187
Checking System for Leaks Using the Fluorescent
Dye Leak Detector ............................................... .187
Dye Injection ........................................................ .187
Electronic Refrigerant Leak Detector ................... .188
PRECAUTIONS FOR HANDLING LEAK
DETECTOR ...................................................... .188
CHECKING PROCEDURE ............................... .189
SERVICE DATA AND SPECIFICATIONS (SDS) ... .191
Service Data and Specifications (SDS) ............... .191
COMPRESSOR ................................................ .191
OIL .................................................................... .191
REFRIGERANT ................................................ .191
ENGINE IDLING SPEED .................................. .191
BELT TENSION ................................................ .191

PRECAUTIONSATC-11
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Revision: November 2009 2006 QX56
Precautions for Servicing CompressorEJS003WV

Plug all openings to prevent moisture and foreign matter from entering.

When the compressor is removed, store it in the same position as it is when mounted on the car.

When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”
exactly. Refer to AT C - 2 2 , "
Maintenance of Oil Quantity in Compressor" .

Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil,
wipe it off by using a clean waste cloth moistened with thinner.

After compressor service operation, turn the compressor shaft by hand more than 5 turns in both
directions. This will equally distribute oil inside the compressor. After the compressor is installed,
let the engine idle and operate the compressor for 1 hour.

After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation. Refer to ATC-176, "
Removal and Installation for Compressor Clutch"
Precautions for Service EquipmentEJS003WW
RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
1. Plug 2. O-ringA. Torque wrench
B. Apply oil C. Do not apply oil to threadsD. NG (no good)
E. OK (okay) F. Inflated portion
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