2005 INFINITI QX4 check engine

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-217
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
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" switch moving 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.
3. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT-13, "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
Monitor item Condition Display value
1 POSITION SWWhen setting the selector
lever to "1" position.ON
When setting selector
lever to other positions.OFF
LCIA0339E
Item Connector No.Te r m i n a l N o .
(Wire color)ConditionData
(Approx.)
1st position
switchM2037 (Y/G) -
GroundWhen setting
the selector
lever to "1"
position.0V
When setting
selector lever
to other posi-
tions.Battery volt-
age
LCIA0341E
SAT6 3 8A

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-219
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
9. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-60,
"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-104, "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" , AT - 1 6 4 , "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 SWWhen setting the selector
lever to "1" position.ON
When setting selector
lever to other positions.OFF
LCIA0339E
Item Connector No.Te r m i n a l N o .
(Wire color)ConditionData
(Approx.)
1st position
switchM2037 (Y/G) -
GroundWhen setting
the selector
lever to "1"
position.0V
When setting
selector lever
to other posi-
tions.Battery volt-
age
LCIA0341E

AT-228
SHIFT CONTROL SYSTEM
Revision: October 20052005 QX56
REMOVAL
1. Remove A/T finisher.

Refer to IP-13, "A/T Finisher" .
2. Disconnect selector control cable.
3. Disconnect A/T device harness connector.
4. 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 PositionECS00CKU
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 PositionECS00CKV
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
LCIA0325E

TRANSMISSION ASSEMBLY
AT-245
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
8. Remove crankshaft position sensor (POS) from A/T assembly.
9. Remove fluid cooler tube.
10. Remove dust cover from converter housing part.
11. Secure drive plate using Tool then remove drive plate to torque
converter bolts.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
NOTE:
Tool must be removed and drive plate turned to access all drive
plate to torque converter bolts.
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 with power tool.
14. Remove air breather hose. Refer to AT-242, "
Removal and Installation" .
15. Disconnect A/T assembly connector.
16. Remove A/T fluid indicator pipe from A/T assembly.
17. Plug up openings such as the A/T fluid indicator pipe hole, etc.
18. Remove the A/T assembly to engine bolts with power tool.
19. Remove A/T assembly from vehicle using Tool and a transmis-
sion 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 the reference value
limit.
LCIA0334E
Tool number : — (J-47245)
LCIA0335E
SCIA0499E
Dimension A : 24.0 mm (0.94 in) or more
SAT0 1 7B

AT-246
TRANSMISSION ASSEMBLY
Revision: October 20052005 QX56
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.

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, using Tool to secure drive plate.
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 MA-22,
"Checking A/T Fluid" , AT - 2 2 8 , "Checking of A/T Position" , AT-228, "Adjustment of A/T Position" . Transmission to
engine bolts: 113 N·m (12 kg-m, 83 ft-lb)
LCIA0371E
Tool number : — (J-47245)
LCIA0335E

AT-248
TRANSMISSION ASSEMBLY
Revision: October 20052005 QX56
8. Remove crankshaft position sensor (POS) from A/T assembly.
9. Disconnect A/T fluid cooler tube from A/T assembly.
10. Remove dust cover from converter housing part.
11. Secure drive plate using Tool then remove drive plate to torque
converter bolts.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
NOTE:
Tool must be removed and drive plate turned to access all drive
plate to torque converter bolts.
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 with power tool.
14. Tilt the transmission slightly to keep the clearance between body and transmission, and then disconnect
air breather hose from A/T fluid indicator pipe. Refer to AT-244, "
REMOVAL" .
15. Disconnect A/T assembly connector and transfer unit connector.
16. Remove A/T fluid indicator pipe.
17. Plug up openings such as the fluid charging pipe hole, etc.
18. Remove A/T assembly to engine bolts with power tool.
19. Remove A/T assembly with transfer from vehicle, using Tool.
CAUTION:

Secure torque converter to prevent it from dropping.

Secure A/T assembly to a transmission jack.
NOTE:
The actual special service tool may differ from tool shown.
20. Remove transfer from A/T assembly. Refer to TF-143,
"REMOVAL" .
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 the reference value
limit.
LCIA0334E
Tool number : — (J-47245)
Tool number : — (J-47002)
LCIA0335E
SCIA2203E
Dimension A : 24.0 mm (0.94 in) or more
SAT0 1 7B

TRANSMISSION ASSEMBLY
AT-249
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 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.

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, using Tool to secure drive plate.
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 MA-22,
"Checking A/T Fluid" , AT-228, "Checking of A/T Position" , AT- 2 2 8 , "Adjustment of A/T Position" . Transmission to engine
bolts: 113 N·m (12 kg-m, 83 ft-lb)
LCIA0371E
Tool number : — (J-47245)
LCIA0335E

ATC-2Revision: October 20052005 QX56 SWITCHES AND THEIR CONTROL FUNCTION ... 31
CAN Communication System Description .............. 32
TROUBLE DIAGNOSIS ............................................ 33
CONSULT-II Function (HVAC) ................................ 33
CONSULT-II BASIC OPERATION ....................... 33
SELF-DIAGNOSIS .............................................. 34
DATA MONITOR .................................................. 34
CONSULT-II Function (BCM) .................................. 36
CONSULT-II BASIC OPERATION ....................... 36
DATA MONITOR .................................................. 37
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 38
WORK FLOW ...................................................... 38
SYMPTOM TABLE .............................................. 38
Component Parts and Harness Connector Location ... 39
ENGINE COMPARTMENT .................................. 39
FRONT PASSENGER COMPARTMENT ............ 40
REAR PASSENGER COMPARTMENT ............... 41
Schematic ............................................................... 42
Wiring Diagram — A/C,A — ................................... 43
Front Air Control Terminals and Reference Value ... 53
PIN CONNECTOR TERMINAL LAYOUT ............ 53
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL ....................................... 53
A/C System Self-diagnosis Function ...................... 55
DESCRIPTION .................................................... 55
Operational Check (Front) ...................................... 57
CHECKING MEMORY FUNCTION ..................... 57
CHECKING BLOWER ......................................... 57
CHECKING DISCHARGE AIR ............................ 58
CHECKING RECIRCULATION ............................ 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 .....................................84
COMPONENT 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 .......................................... 130
Self-diagnosis ....................................................... 132
INSPECTION FLOW .......................................... 132
Memory Function .................................................. 133
INSPECTION FLOW .......................................... 133
Water Valve Circuit ................................................ 133
COMPONENT DESCRIPTION .......................... 133
DIAGNOSTIC PROCEDURE FOR WATER
VALVE ................................................................ 134
COMPONENT INSPECTION ............................. 136
Ambient Sensor Circuit ......................................... 137
COMPONENT DESCRIPTION .......................... 137
AMBIENT TEMPERATURE INPUT PROCESS . 137