2005 INFINITI QX4 ignition

TF-122
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: October 20052005 QX56
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check continuity between transfer control unit harness connec-
tor E142 terminals 3 (B), 6 (B), E143 terminal 45 (B) and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK COMBINATION METER POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check voltage between combination meter harness connector
terminal and ground.
4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between combination meter harness connector
terminal and ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following. If any items are damaged, repair or
replace damaged parts.

10A fuse No. 14 located in the fuse block (J/B). Refer
to PG-4, "
POWER SUPPLY ROUTING CIRCUIT" .

Harness for short or open between battery and combination meter harness connector M24 ter-
minal 24 (O/L).

Ignition switch. Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT" . Continuity should exist.
SDIA2691E
Connector Terminal (Wire color) Voltage (Approx.)
M24 24 (O/L) - Ground 0V
WDIA0151E
Connector Terminal (Wire color) Voltage (Approx.)
M24 24 (O/L) - Ground Battery voltage
WDIA0152E

TROUBLE DIAGNOSIS FOR SYMPTOMS
TF-123
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Revision: October 20052005 QX56
4. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and combination meter harness connector.
3. Check continuity between the following terminals.
–Transfer control unit harness connector E142 terminal 5 (W/B)
and combination meter harness connector M24 terminal 34 (W/
B).
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. CHECK INDICATOR LAMP CIRCUIT
1. Connect combination meter harness connector.
2. Disconnect transfer control unit harness connector.
3. Turn ignition switch “ON”. (Do not start engine.)
4. Ground the following terminal using suitable wiring.
–Transfer control unit harness connector E142 terminal 5 (W/B)
and ground.
Does 4WD warning lamp turn on?
OK >> GO TO 6.
NG >> Replace combination meter. Refer to IP-13, "
Combina-
tion Meter" .
6. SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.
NG >> GO TO 7.
7. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-36, "
Transfer Control Unit Input/Output Signal Ref-
erence Values" .
OK or NG
OK >> Inspection End.
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.
4WD Shift Indicator Lamp or 4LO Indicator Lamp Does Not ChangeEDS002HO
SYMPTOM:
4WD shift indicator lamp or 4LO indicator lamp does not change when switching 4WD shift switch.Continuity should exist.
WDIA0154E
SDIA2774E

TF-124
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: October 20052005 QX56
DIAGNOSTIC PROCEDURE
1. CONFIRM THE SYMPTOM
Confirm 4WD shift indicator lamp and 4LO indicator lamp turn on when ignition switch is turned to ON.
Do 4WD shift indicator lamp and 4LO indicator lamp turn on?
YES >> GO TO 2.
NO >> Go to TF-117, "
4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn ON" .
2. CHECK SYSTEM FOR 4WD SHIFT SWITCH
Perform trouble diagnosis for 4WD shift switch system. Refer to TF-62, "
4WD Shift Switch" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK SYSTEM FOR WAIT DETECTION SWITCH
Perform trouble diagnosis for wait detection switch system. Refer to TF-66, "
Wait Detection Switch" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK SYSTEM FOR NEUTRAL-4LO SWITCH
Perform trouble diagnosis for neutral-4LO switch system. Refer to TF-59, "
Neutral-4LO Switch" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. CHECK SYSTEM FOR ATP SWITCH
Perform trouble diagnosis for ATP switch system. Refer to TF-113, "
AT P S w i t c h" .
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. CHECK SYSTEM FOR 2-4WD SOLENOID
Perform trouble diagnosis for 2-4WD solenoid system. Refer to TF-91, "
2-4WD Solenoid" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7. CHECK SYSTEM FOR TRANSFER CONTROL DEVICE
Perform trouble diagnosis for transfer control device system. Refer to TF-81, "
Transfer Control Device" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8. CHECK SYSTEM FOR ACTUATOR MOTOR
Perform trouble diagnosis for actuator motor system. Refer to TF-70, "
Actuator Motor" .
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.

TF-126
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: October 20052005 QX56
4. CHECK SYSTEM FOR ATP SWITCH
Perform trouble diagnosis for ATP switch system. Refer to TF-113, "
AT P S w i t c h" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and combination meter harness connector.
3. Check continuity between the following terminals.
–Transfer control unit harness connector E142 terminal 15 (L/B)
and combination meter harness connector M24 terminal 6 (L/B).
–Transfer control unit harness connector E143 terminal 40 (L)
and combination meter harness connector M24 terminal 7 (R/B).
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. CHECK ATP WARNING LAMP CIRCUIT
1. A/T selector lever in "P" position.
2. Connect combination meter harness connector and transfer control unit harness connector.
3. Disconnect ATP switch harness connector.
4. Ground the following terminal using suitable wiring.
–ATP switch harness connector F55 terminal 8 (L/Y) and ground.
5. Turn ignition switch “ON”. (Do not start engine.)
Does indicator lamp turn on?
OK >> GO TO 7.
NG >> Replace combination meter. Refer to IP-13, "
Combina-
tion Meter" . Continuity should exist.
WDIA0149E
40 to 7: Continuity should not exist.
7 to 40: Continuity should exist.
WDIA0150E
SDIA2769E

TROUBLE DIAGNOSIS FOR SYMPTOMS
TF-129
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Revision: October 20052005 QX56
5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-36, "
Transfer Control Unit Input/Output Signal Ref-
erence Values" .
OK or NG
OK >> Inspection End.
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.
4WD Warning Lamp Flashes SlowlyEDS002HS
SYMPTOM:
While driving, 4WD warning lamp flashes slowly. (When continuing to flash until turning ignition
switch OFF.)
NOTE:
Slow flashing: 1 time/2 seconds
DIAGNOSTIC PROCEDURE
1. CHECK TIRE
Check the following.

Tire pressure

Wear condition

Longitudinal tire size (There is no difference between longitudinal tires.)
OK or NG
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2. CHECK TRANSFER FLUID TEMPERATURE
Perform trouble diagnosis for transfer fluid temperature system. Refer to TF-102, "
Transfer Fluid Temperature"
.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK CLUTCH PRESSURE SWITCH
Perform trouble diagnosis for clutch pressure switch system. Refer to TF-105, "
Clutch Pressure Switch" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. SYMPTOM CHECK
Check again.
OK or NG
OK >> Inspection End.
NG >> GO TO 5.
5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-36, "
Transfer Control Unit Input/Output Signal Ref-
erence Values" .
OK or NG
OK >> Inspection End.
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.

TF-132
TRANSFER CONTROL UNIT
Revision: October 20052005 QX56
TRANSFER CONTROL UNITPFP:33084
Removal and InstallationEDS002IS
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer control unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the glove box assembly. Refer to IP-14, "
Instrument Lower Cover RH and Glove Box" .
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.

When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:

Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.

After the installation, check perform self-diagnosis. Refer to TF-50, "Self-diagnostic Procedure" . If NG,
adjust position between transfer assembly and transfer control unit. Refer to TF-4, "
Precautions for Trans-
fer Assembly and Transfer Control Unit Replacement" .
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)

WT-1
ROAD WHEELS & TIRES
E SUSPENSION
CONTENTS
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SECTION WT
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WT
Revision: October 20052005 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
DISPLAY UNIT ...................................................... 9
CAN COMMUNICATION .......................................... 10
System Description ................................................ 10
TROUBLE DIAGNOSES ...........................................11
Wiring Diagram .......................................................11
BCM Input/Output Signal Standard ........................ 13
ID Registration Procedure ...................................... 14
ID REGISTRATION WITH TRANSMITTER
ACTIVATION TOOL ............................................ 14
ID REGISTRATION WITHOUT TRANSMITTER
ACTIVATION TOOL ............................................ 15
Transmitter Wake Up Operation ............................. 16
WITH TRANSMITTER ACTIVATION TOOL ........ 16
CONSULT-II Function (BCM) ................................. 17
Self-Diagnosis ........................................................ 18DESCRIPTION .................................................... 18
FUNCTION .......................................................... 18
CONSULT-II ......................................................... 18
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 20
INTRODUCTION ................................................. 20
WORK FLOW ...................................................... 20
Preliminary Check .................................................. 21
Malfunction Code/Symptom Chart .......................... 22
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ........................................................................ 24
Inspection 1: Transmitter or Control Unit (BCM) ..... 24
MALFUNCTION CODE NO. 21, 22, 23 OR 24 ... 24
Inspection 2: Transmitter - 1 ................................... 24
MALFUNCTION CODE NO. 31, 32, 33, 34, 41,
42, 43, 44, 45, 46, 47 OR 48 ............................... 24
Inspection 3: Transmitter - 2 ................................... 25
MALFUNCTION CODE NO. 35, 36, 37 OR 38 ... 25
Inspection 4: Vehicle Speed Signal ........................ 26
MALFUNCTION CODE NO. 52 ........................... 26
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 27
Inspection 1: Warning Lamp Does Not Come On
When Ignition Switch Is Turned On ........................ 27
Inspection 2: Warning Lamp Stays On When Ignition
Switch Is Turned On ............................................... 27
Inspection 3: Warning Lamp Flashes When Ignition
Switch Is Turned On ............................................... 29
Inspection 4: Hazard Warning Lamp Flashes When
Ignition Switch Is Turned On .................................. 30
Inspection 5: “TIRE PRESSURE” Information In
Display Unit Does Not Exist .................................... 31
Inspection 6: ID Registration Cannot Be Completed ... 31
REMOVAL AND INSTALLATION ............................. 32
Transmitter (Pressure Sensor) ............................... 32
REMOVAL ........................................................... 32
INSTALLATION ................................................... 32
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 34
Road Wheel ............................................................ 34
Tire ......................................................................... 34

LOW TIRE PRESSURE WARNING SYSTEM
WT-9
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Revision: October 20052005 QX56
BCM (BODY CONTROL MODULE)
Reads the air pressure signal received by the remote keyless entry
receiver, and controls the warning lamp and the buzzer operations
as shown below. It also has a judgement function to detect a system
malfunction.
WARNING LAMP AND BUZZER
Indicates low tire pressure or system malfunction.
DISPLAY UNIT
Displays the air pressure of each tire.

After the ignition switch is turned on, the pressure values will not
be displayed until the data of each wheel is received.
LEIA0068E
Condition Warning lamp Buzzer
Less than 193 kPa (2.0 kg/cm
2 , 28 psi)
[Flat tire]ONSounds for 10
seconds
System malfunctionAfter key ON,
flashes once per
secondOFF
System normalON for 1 second
after ignition ONOFF
LEIA0055E
WEIA0082E