sensor INFINITI QX56 2006 Factory Service Manual

TROUBLE DIAGNOSISTF-51
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Revision: November 2009 2006 QX56
Diagnostic Procedure
1. Warm up engine.
2. Move A/T selector lever to “P” position.
3. Turn 4WD shift switch to “2WD” position.
4. Turn ignition switch “ON” and “OFF ” at least twice, and then turn ignition switch “OFF”.
5. Turn 4WD shift switch to “AUTO” position.
6. Turn ignition switch “ON”. (Do not start engine.)
7. 4WD warning lamp ON. If 4WD warning lamp does not turn ON, refer to TF-121, "
4WD Warning Lamp Does Not Turn ON" .
8. Move A/T selector lever to “R” position.
9. Turn 4WD shift switch to “2WD”, “AUTO ” and “2WD ” in order.
10. Move A/T selector lever to “D” position.
11. Turn 4WD shift switch to “4H”, “AUTO ” and “4H” in order.
12. Move A/T selector lever to “N” position.
13. Turn 4WD shift switch to “AUTO” position.
14. Move A/T selector lever to “P” position.
15. Read the flickering of 4WD warning lamp. Refer to TF-51, "
Judgement Self-diagnosis" .
Judgement Self-diagnosis
When a malfunction is detected, the malfunction route is indicated by flickering of the 4WD warning lamp.
PDIA0227E
Flickering pattern or
flickering condition Items
Malfunction Check items
2 Output shaft revolution
signal (from TCM)

Malfunction is detected in output shaft revolution signal
that is output from TCM through CAN communication.

Improper signal is input while driving. TF-58, "
Output Shaft
Revolution Signal
(TCM)"
3
Clutch pressure sole-
noid signal
Proper voltage is not applied to clutch pressure solenoid
valve due to open or short circuit. TF-86, "Clutch Pres-
sure Solenoid"
4
2-4WD solenoid signal
Proper voltage is not applied to 2-4WD solenoid valve
due to open or short circuit. TF-91, "2-4WD Sole-
noid"
5
Transfer motor
Motor does not operate properly due to open or short cir-
cuit in transfer motor or motor relay. TF-95, "Transfer Motor"
6
Vehicle speed signal
(from ABS)

Malfunction is detected in vehicle speed signal that is
output from ABS actuator and electric unit (control unit)
through CAN communication.

Improper signal is input while driving. TF-58, "
Vehicle Speed
Sensor (ABS)"
7
CAN communication
Malfunction has been detected from CAN communica-
tion line. TF-113, "CAN Commu-
nication Line"
8
AD converter
AD converter system of transfer control unit is malfunc-
tioning. TF-54, "Power Supply
Circuit For Transfer
Control Unit"

TF-52
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
9Transfer fluid tempera-
ture

Signal voltage from fluid temperature sensor is abnor-
mally high (Transfer fluid temperature is abnormally low)
while driving. TF-102, "Transfer Fluid
Temperature"
10
Neutral-4LO switch
Improper signal from neutral-4LO switch is input due to
open or short circuit. TF-59, "Neutral-4LO
Switch"
11
Clutch pressure switch

Improper signal from clutch pressure switch is input due
to open or short circuit.

Malfunction occurs in clutch pressure switch or hydraulic
circuit. TF-105, "
Clutch Pres-
sure Switch"
12
Line pressure switch

Improper signal from line pressure switch is input due to
open or short circuit.

Malfunction occurs in line pressure switch or hydraulic
circuit. TF-108, "
Line Pressure
Switch"
13
Engine speed signal
(from ECM)

Malfunction is detected in engine speed signal that is
output from ECM through CAN communication.

Improper signal is input while driving. TF-85, "
Engine Speed
Signal (ECM)"
14
Throttle position sen-
sor (from ECM)

Malfunction is detected in accelerator pedal position sig-
nal that is output from ECM through CAN communica-
tion.

Signal voltage from accelerator pedal position sensor is
abnormally high or low. TF-111, "
Throttle Posi-
tion Signal (ECM)"
15
Power supply
Power supply voltage for transfer control unit is abnor-
mally low while driving. TF-54, "Power Supply
Circuit For Transfer
Control Unit"
16
4WD shift switch
More than two switch inputs are simultaneously detected
due to short circuit of 4WD shift switch. TF-62, "4WD Shift
Switch"
17
ABS operation signal
(from ABS)

Malfunction is detected in ABS operation signal that is
output from ABS actuator and electric unit (control unit)
through CAN communication. TF-111, "ABS Operation
Signal (ABS)"
18
Wait detection switch
Improper signal from wait detection switch is input due to
open or short circuit. TF-66, "Wait Detection
Switch"
19
Actuator motor

Motor does not operate properly due to open or short cir-
cuit in actuator motor.

Malfunction is detected in the actuator motor. (When
4WD shift switch is operated and actuator motor is not
operated)

Malfunction is detected in transfer shift high relay and
transfer shift low relay. TF-70, "
Actuator
Motor", TF-54, "Power
Supply Circuit For
Transfer Control Unit"
20
Actuator position
switch

Improper signal from actuator position switch is input
due to open or short circuit.

Malfunction is detected in the actuator position switch. TF-77, "
Actuator Posi-
tion Switch"
21
Actuator circuit

Transfer control device actuator circuit is shorted or
open. (Malfunctions are detected when motor relay cir-
cuit is open/shorted or relay transfer shift circuit is open/
shorted.)

Malfunction occurs in transfer control device drive circuit. TF-81, "
Transfer Con-
trol Device"

Malfunction is detected in transfer shut off relay.
TF-54, "
Power Supply
Circuit For Transfer
Control Unit"
22
VDC operation signal
(from VDC)

Malfunction is detected in VDC operation signal that is
output from ABS actuator and electric unit (control unit)
through CAN communication. TF-112, "VDC Opera-
tion Signal (ABS)"
23
TCS operation signal
(from TCS)

Malfunction is detected in TCS operation signal that is
output from ABS actuator and electric unit (control unit)
through CAN communication. TF-112, "TCS Opera-
tion Signal (ABS)"
Flickering pattern or
flickering condition Items
Malfunction Check items

TF-58
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
Output Shaft Revolution Signal (TCM)EDS002I6
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer to TF-50, "
SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE VALUE" .
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with TCM again. Refer to TF-50, "
SELF-DIAGNOSTIC PROCEDURE
(WITH CONSULT-II)" .
Vehicle Speed Sensor (ABS)EDS002I7
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-29, "
SELF-DIAGNO-
SIS" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE VALUE" .
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
3. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) again. Refer to BRC-29,
"SELF-DIAGNOSIS" .

TF-102
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
COMPONENT INSPECTION
Transfer Motor Relay
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer motor relay. Refer to TF-22, "
Location of Electrical Parts" .
3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 5.
5. If NG, replace transfer motor relay. Refer to TF-22, "
Location of
Electrical Parts" .
Transfer Motor
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer motor. Refer to TF-142, "
Removal and Installation" .
3. Apply 12V direct current between transfer motor terminals 14 and 15.
4. If transfer motor does not operate, replace transfer motor. Refer to TF-142, "
Removal and Installation" .
Transfer Fluid TemperatureEDS002IJ
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals. Condition
Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
LDIA0098E
LDIA0097E
Monitored item [Unit]Content ConditionDisplay value
(Approx.)
FLUID TEMP SE [V] Condition of transfer fluid
temperature Transfer fluid temperature approx. 20 - 80
°C (68 -
176° F) 1.1 - 0.3V
Te r m i n a lWire
color Item
ConditionData (Approx.)
28 B/G Sensor ground Always0V
31 G Transfer fluid temperature
sensor
Ignition switch: ONTransfer fluid temperature approx. 20°C
(68
°F) 1.1V
Transfer fluid temperature approx. 80°C
(176 °F) 0.3V

TROUBLE DIAGNOSIS FOR SYSTEMTF-103
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DIAGNOSTIC PROCEDURE
1. CHECK TRANSFER FLUID TEMPERATURE SENSOR SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR ” mode for “ALL MODE AWD/4WD ” with CONSULT-II.
3. Read out the value of “FLUID TEMP SE”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector terminals and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER TERMINAL CORD
ASSEMBLY 1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connec- tor.
3. Check continuity between the following terminals.
–Transfer control unit harness connector E143 terminal 28 and
transfer terminal cord assembly harness connector F56 terminal
3.
–Transfer control unit harness connector E143 terminal 31 and
transfer terminal cord assembly harness connector F56 terminal
2.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Condition Display value
(Approx.)
Transfer fluid temperature approx. 20 - 80 °C (68 - 176°F) 1.1 - 0.3V
SDIA2741E
Connector Terminal ConditionData
(Approx.)
E143 28 -
Ground Always
0V
31 -
Ground Ignition switch:
ON Transfer fluid temperature
approx. 20
°C (68°F) 1.1V
Transfer fluid temperature
approx. 80 °C (176°F) 0.3V
SDIA2742E
Continuity should exist.
SDIA2743E

TF-104
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
3. CHECK TRANSFER FLUID TEMPERATURE SENSOR
1. Turn ignition switch “ OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly ter- minals 2 and 3.
OK or NG
OK >> GO TO 4.
NG >> Replace transfer fluid temperature sensor. Refer to TF-
22, "Location of Electrical Parts" .
4. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE VALUE" .
OK or NG
OK >> GO TO 5.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
5. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit. Refer to TF-132, "
Removal and Installation" .
COMPONENT INSPECTION
1. Turn ignition switch “OFF ”. (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly har- ness connector F56 terminals 2 and 3.
4. If NG, replace the transfer fluid temperature sensor. Refer to TF-
22, "Location of Electrical Parts" .
Temperature °C (°F) Resistance (Approx.)
20 (68) 2.5 k\b
80 (176) 0.3 k\b
WDIA0188E
Temperature °C (°F) Resistance (Approx.)
20 (68) 2.5 k\b
80 (176) 0.3 k\b
WDIA0188E

TRANSFER ASSEMBLYTF-161
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Revision: November 2009 2006 QX56
b. Remove the following from the control valve assembly:

Clutch pressure solenoid valve

2-4WD shift solenoid valve

Clutch pressure switch

Line pressure switch

Transfer fluid temperature sensor
c. Remove the O-rings from each solenoid valve, switch and termi- nal body.
d. Place the control valve with the lower body facing up. Remove the two bolts, and then remove the lower body and separator
plate from the upper body.
CAUTION:
Do not drop relief balls. Detach lower body carefully.
e. Make sure the reverse balls, relief balls, relief springs, accumu- lator pistons and valve springs are securely installed as shown,
and remove them.
f. Remove the retainer plates.
g. Remove each control valve, spring and plug.
WDIA0199E
SDIA3187E
SDIA2126E
SDIA2127E
SDIA3317E

TRANSFER ASSEMBLYTF-165
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Bearing

Make sure the bearings roll freely and are free from noise, pit-
ting and cracks.
Main Oil Pump
1. Check the inner and outer circumference, tooth face, and side-
face of the inner and outer gears for damage or abnormal wear.
2. Measure the side clearance between the main oil pump housing edge and the inner and outer gears.
3. Make sure the side clearance is within specification. If the mea- surement is out of specification, replace the inner and outer
gears with new ones as a set. Refer to TF-165, "
Main Oil Pump"
.
Sub-oil Pump
1. Check the inner and outer circumference, tooth face, and side-
face of the inner and outer gears for damage or abnormal wear.
2. Measure the side clearance between the sub oil pump housing edge and the inner and outer gears.
3. Make sure the side clearance is within specification. If the mea- surement is out of specification, replace the inner and outer
gears with new ones as a set. Refer to TF-165, "
Sub-oil Pump" .
Control Valve

Check resistance between the terminals of the clutch pressure
solenoid valve, 2-4WD shift solenoid valve, clutch pressure
switch, line pressure switch and the transfer fluid temperature
sensor. Refer to TF-90, "
COMPONENT INSPECTION" (clutch
pressure solenoid valve), TF-94, "
COMPONENT INSPECTION"
(2-4WD solenoid valve), TF-107, "COMPONENT INSPECTION"
(clutch pressure switch), TF-110, "COMPONENT INSPECTION"
(line pressure switch) and TF-104, "COMPONENT INSPEC-
TION" (transfer fluid temperature sensor).
SDIA2175E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2174E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2173E
WDIA0199E

TRANSFER ASSEMBLYTF-169
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d. Install the reverse balls, relief balls and relief springs, accumula-
tor pistons and valve springs to the upper body.
e. Install the lower body and new separator plate to the upper body.
CAUTION:
Do not reuse separator plate.
f. With the lower body down, tighten the two bolts shown.
g. Apply ATF to the new O-rings, and install them to each solenoid valve, switch and terminal body.
CAUTION:
Do not reuse O-rings.
h. Install the following to the control valve assembly:

Clutch pressure solenoid valve

2-4WD shift solenoid valve

Clutch pressure switch

Line pressure switch

Transfer fluid temperature sensor
10. Apply ATF to the new lip seals, and install them to the center case.
CAUTION:

Do not reuse lip seals.

There are 2 kinds of lip seals (lip seal of large inner diam-
eter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm their position for installation.
SDIA2126E
WDIA0200E
WDIA0198E
SDIA2123E

WT-1
ROAD WHEELS & TIRES
E SUSPENSION
CONTENTS
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Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 2
PREPARATION ...................................................... ..... 3
Special Service Tool ............................................ ..... 3
Commercial Service Tools ................................... ..... 3
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ........................................... ..... 4
NVH Troubleshooting Chart ................................ ..... 4
WHEEL .................................................................. ..... 5
Inspection ............................................................ ..... 5
WHEEL AND TIRE ASSEMBLY ............................ ..... 6
Balancing Wheels ............................................... ..... 6
REMOVAL ........................................................ ..... 6
WHEEL BALANCE ADJUSTMENT ................. ..... 6
Rotation ............................................................... ..... 7
LOW TIRE PRESSURE WARNING SYSTEM ....... ..... 8
System Components ........................................... ..... 8
System Description ............................................. ..... 8
TRANSMITTER ................................................ ..... 8
REMOTE KEYLESS ENTRY RECEIVER ........ ..... 8
BCM (BODY CONTROL MODULE) ................. ..... 9
WARNING LAMP AND BUZZER ..................... ..... 9
COMBINATION METER .................................. ..... 9
DISPLAY UNIT ................................................. ..... 9
CAN COMMUNICATION ....................................... ... 10
System Description ............................................. ... 10
TROUBLE DIAGNOSES ....................................... ....11
Wiring Diagram – T/WARN – .............................. .... 11
Terminals and Reference Values for BCM .......... ... 13
ID Registration Procedure ................................... ... 14
ID REGISTRATION WITH TRANSMITTER
ACTIVATION TOOL ......................................... ... 14
ID REGISTRATION WITHOUT TRANSMITTER
ACTIVATION TOOL ......................................... ... 16
Transmitter Wake Up Operation .......................... ... 18
WITH TRANSMITTER ACTIVATION TOOL ..... ... 18
CONSULT-II Function (BCM) .............................. ... 19
Self-Diagnosis ..................................................... ... 20DESCRIPTION .................................................
... 20
FUNCTION ....................................................... ... 20
CONSULT-II ...................................................... ... 20
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ................................................... ... 22
INTRODUCTION .............................................. ... 22
WORK FLOW ................................................... ... 22
Preliminary Check ............................................... ... 23
Malfunction Code/Symptom Chart ....................... ... 24
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ..................................................................... ... 26
Inspection 1: Transmitter or Control Unit (BCM) .. ... 26
MALFUNCTION CODE NO. 21, 22, 23 OR 24
(DTC C1708, C1709, C1710 OR C1711) ......... ... 26
Inspection 2: Transmitter - 1 ................................ ... 26
MALFUNCTION CODE NO. 31, 32, 33, 34, 41,
42, 43, 44, 45, 46, 47 OR 48 ............................ ... 26
Inspection 3: Transmitter - 2 ................................ ... 27
MALFUNCTION CODE NO. 35, 36, 37 OR 38 ... 27
Inspection 4: Vehicle Speed Signal ..................... ... 28
MALFUNCTION CODE NO. 52 (DTC C1729) . ... 28
TROUBLE DIAGNOSIS FOR SYMPTOMS ........... ... 29
Inspection 1: Warning Lamp Does Not Come On
When Ignition Switch Is Turned On ..................... ... 29
Inspection 2: Low Tire Pressure Warning Lamp
Stays On When Ignition Switch Is Turned On ...... ... 30
Inspection 3: Warning Lamp Flashes When Ignition
Switch Is Turned On ............................................ ... 32
Inspection 4: Hazard Warning Lamp Flashes When
Ignition Switch Is Turned On ............................... ... 33
Inspection 5: “TIRE PRESSURE” Information In
Display Unit Does Not Exist ................................. ... 34
Inspection 6: ID Registration Cannot Be Completed ... 35
REMOVAL AND INSTALLATION .......................... ... 36
Transmitter (Pressure Sensor) ............................ ... 36
REMOVAL ........................................................ ... 36
INSTALLATION ................................................ ... 36
SERVICE DATA AND SPECIFICATIONS (SDS) ... ... 38
Road Wheel ............................................................ 38
Tire ...................................................................... ... 38