2005 INFINITI QX4 Factory Service Manual

engine oil capacity sat nav differential maintenance reset radiator cap fuse

Page 3185 of 3419

INFINITI QX4 2005 Factory Service Manual TF-42
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
22 Y/R Power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF 0V
23 R4WD shift switch
(4LO)Ignition switch: ON4WD shift switch: 4

TF-42
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
22 Y/R Power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF 0V
23 R4WD shift switch
(4LO)Ignition switch: ON4WD shift switch: 4LO Battery voltage
4WD shift switch: 2WD, AUTO or 4H 0V
24 LG/R4WD shift switch
(AUTO)Ignition switch: ON4WD shift switch: AUTO Battery voltage
4WD shift switch: 2WD, 4H or 4LO 0V
25 V Neutral-4LO switch
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 2WD, AUTO or 4H Battery voltage
4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)Battery volt-
age → 0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)0V → Battery
voltage
4WD shift switch: 4LO 0V
27 W/LActuator position switch 2
(High)
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4H, AUTO or 2WD 0V
4WD shift switch: 4LO Battery voltage
28 B/G Sensor ground Always 0V
29 L/W Ignition switch monitorIgnition switch: ON Battery voltage
Ignition switch: OFF 0V
30 SB Shut off relayIgnition switch: ON 0V
Ignition switch: OFF Battery voltage
31 GTransfer fluid temperature
sensorIgnition switch: ONTransfer fluid temperature approx. 20°C
(68°F)1.1V
Transfer fluid temperature approx. 80°C
(176°F)0.3V
33 R/LTransfer shift high relay
monitor
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4H to 4LO (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
34 BR Clutch pressure switch
Vehicle stopped
Engine running
A/T selector lever
“D” position4WD shift switch: AUTO or 4H (“Wait”
function is not operating.)0V
Vehicle stopped
Engine running4WD shift switch: 2WD (“Wait” function is
not operating.)Battery voltage
35BR/
WLine pressure switch
Ignition switch: ON
A/T selector lever “D” position
4WD shift switch: AUTO0V
After the vehicle
has been left at
room temperature
for 5 minutes and
more with ignition
switch in “OFF”
position.
Ignition switch: ON
A/T selector lever: “P” or "N" position
4WD shift switch: other than AUTOBattery voltage Te r m i n a lWire
colorItem Condition Data (Approx.)

Page 3186 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
TF-43
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector t

TROUBLE DIAGNOSIS
TF-43
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.40 L ATP switch
Vehicle stopped
Engine running
A/T selector lever
“N”
Brake pedal
depressed4WD shift switch: 4H to 4LO or 4LO to 4H
(While actuator motor is operating.)0V
Except the above Battery voltage
41 RTransfer motor relay moni-
tor
Accelerator pedal
depressed
Vehicle stopped
Engine running
Brake pedal
depressed4WD shift switch: 2WD 0V
4WD shift switch: AUTO or 4LO (A/T
selector lever “P” or “N” position)0V
(Battery volt-
age for approx.
2 sec. after
shifting to “P”
and “N”.)
4WD shift switch: AUTO or 4LO (Except
for A/T selector lever “P” or “N” position)Battery voltage
4WD shift switch: 4H (A/T selector lever
“P” position)0V
(Battery volt-
age for approx.
2 sec. after
shifting to “P”.)
4WD shift switch: 4H (Except for A/T
selector lever “P” position)Battery voltage
42 P/GTransfer shift low relay
monitor
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)Battery voltage
Except the above 0V
43 G/Y Wait detection switch
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 2WD, AUTO or 4H Battery voltage
4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)Battery volt-
age → 0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)0V → Battery
voltage
4WD shift switch: 4LO 0V
44 LG/BActuator position switch 1
(Low)
Vehicle stopped
Engine running
A/T selector lever
“N” position
Brake pedal
depressed4WD shift switch: 4LO 0V
4WD shift switch: 2WD, AUTO or 4H Battery voltage
45 B Ground Always 0V
47 WPower supply
(Memory back-up)Ignition switch: ON Battery voltage
Ignition switch: OFF Battery voltage Te r m i n a lWire
colorItem Condition Data (Approx.)

Page 3187 of 3419

INFINITI QX4 2005 Factory Service Manual TF-44
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
CONSULT-II Function (ALL MODE AWD/4WD)EDS002HK
FUNCTION
CONSULT-II can display each diagnostic item using the diagnostic test modes shown follow

Page 3188 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
TF-45
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
SELF-DIAG RESULT MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer to TF-44, "CONSULT-II S

TROUBLE DIAGNOSIS
TF-45
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
SELF-DIAG RESULT MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer to TF-44, "CONSULT-II SETTING PROCEDURE"
.
2. With engine at idle, touch “SELF-DIAG RESULTS”.
Display shows malfunction experienced since the last erasing
operation.
NOTE:
The details for “TIME” are as follow:
–“0”: Error currently detected with transfer control unit.
–Except for “0”: Error detected in the past and memorized
with transfer control unit.
Detects frequency of driving after DTC occurs (frequency
of turning ignition switch “ON/OFF”).
Display Item List
SDIA2687E
Items (CONSULT-II screen
terms)Diagnostic item is detected when... Check item
CONTROL UNIT 1
[P1802]
Malfunction is detected in the memory (RAM) system of transfer
control unit.TF-57, "Transfer Control Unit"
CONTROL UNIT 2
[P1803]Malfunction is detected in the memory (ROM) system of transfer
control unit.TF-57, "Transfer Control Unit"
CONTROL UNIT 3
[P1804]Malfunction is detected in the memory (EEPROM) system of
transfer control unit.TF-57, "Transfer Control Unit"
VHCL SPEED SEN·AT
[P1807]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)"
VHCL SPEED SEN·ABS
[P1808]
Malfunction is detected in vehicle speed signal that is output from
ABS actuator and electric unit (control unit) through CAN commu-
nication.
Improper signal is input while driving.TF-58, "
Vehicle Speed Sensor
(ABS)"
CONTROL UNIT 4
[P1809]AD converter system of transfer control unit is malfunctioning.TF-57, "Transfer Control Unit"
4L POSI SW TF
[P1810]Improper signal from neutral-4LO switch is input due to open or
short circuit.TF-59, "Neutral-4LO Switch"
BATTERY VOLTAGE
[P1811]Power supply voltage for transfer control unit is abnormally low
while driving.TF-54, "Power Supply Circuit For
Transfer Control Unit"
4WD MODE SW
[P1813]More than two switch inputs are simultaneously detected due to
short circuit of 4WD shift switch.TF-62, "4WD Shift Switch"
4WD DETECT SWITCH
[P1814]Improper signal from wait detection switch is input due to open or
short circuit.TF-66, "Wait Detection Switch"
PNP SW/CIRC
[P1816]When A/T PNP switch signal is malfunction or communication
error between the vehicles.TF-69, "PNP Switch Signal
(TCM)"
SHIFT ACTUATOR
[P1817]
Motor does not operate properly due to open or short circuit 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"
SHIFT ACT POSI SW
[P1818]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 Position
Switch"

Page 3189 of 3419

INFINITI QX4 2005 Factory Service Manual TF-46
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
CAUTION:
If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communica-
tion line.
If

TF-46
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
CAUTION:
If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communica-
tion line.
If “VHCL SPEED SEN·AT [P1808]”, “ABS OP SIG [P1830]”, “VDC OP SIG [P1831]” or “TCS OP SIG [P1832]” is displayed,
first perform the trouble diagnosis for ABS system.
If “VHCL SPEED SEN·AT [P1808]”, is displayed, first perform the trouble diagnosis for A/T system.
NOTE:
If "SHIFT ACT POSI SW [P1818]" or “SHIFT ACT CIR [P1819]” is displayed, first erase self-diagnostic results. ("SHIFT ACT POSI
SW [P1818]" or “SHIFT ACT CIR [P1819]” may be displayed after installing transfer control unit or transfer assembly.)
If “CL PRES SW [P1827]” or “LINE PRES SW [P1828]” is displayed only while driving in reverse, check the continuity of “R” posi-
tion on A/T PNP switch. When there is nothing wrong with the electrical system, check the hydraulic system. SHIFT ACT CIR
[P1819]
Transfer control device actuator circuit is shorted or open. (Mal-
functions are detected when transfer shift relay circuit is open/
shorted or relay monitor circuit is open/shorted.)
Malfunction occurs in transfer control device drive circuit.
Malfunction is detected in transfer shut off relay.TF-81, "
Transfer Control Device"
Malfunction is detected in transfer shut off relay.TF-54, "Power Supply Circuit For
Transfer Control Unit"
ENGINE SPEED SIG
[P1820]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)"
DUTY SOLENOID
[P1822]Proper voltage is not applied to clutch pressure solenoid valve
due to open or short circuit.TF-86, "Clutch Pressure Sole-
noid"
2-4WD SOLENOID
[P1823]Proper voltage is not applied to 2-4WD solenoid valve due to
open or short circuit.TF-91, "2-4WD Solenoid"
MOTOR RELAY
[P1824]Motor does not operate properly due to open or short circuit in
transfer motor or motor relay.TF-95, "Transfer Motor"
OIL TEMP SEN
[P1826]Signal voltage from fluid temperature sensor is abnormally high
(Transfer fluid temperature is abnormally low) while driving.TF-102, "Transfer Fluid Temper-
ature"
CLUTCH PRES SW
[P1827]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 Pressure
Switch"
LINE PRES SW
[P1828]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"
THROTTLE POSI SEN
[P1829]
Malfunction is detected in accelerator pedal position signal that is
output from ECM through CAN communication.
Signal voltage from accelerator pedal position sensor is abnor-
mally high or low.T F - 111 , "
Throttle Position Signal
(ECM)"
ABS OP SIG
[P1830]Malfunction is detected in ABS operation signal that is output
from ABS actuator and electric unit (control unit) through CAN
communication.T F - 111 , "ABS Operation Signal
(ABS)"
VDC OP SIG
[P1831]Malfunction is detected in VDC operation signal that is output
from ABS actuator and electric unit (control unit) through CAN
communication.TF-112, "VDC Operation Signal
(ABS)"
TCS OP SIG
[P1832]Malfunction is detected in TCS operation signal that is output
from ABS through CAN communication.TF-112, "TCS Operation Signal
(ABS)"
CAN COMM CIRCUIT
[U1000]Malfunction has been detected from CAN communication line.TF-113, "CAN Communication
Line"
NO DTC IS DETECTED.
FURTHER TESTING MAY
BE REQUIRED.
No NG item has been detected. — Items (CONSULT-II screen
terms)Diagnostic item is detected when... Check item

Page 3190 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
TF-47
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
How to Erase Self-diagnostic Results
1. Perform applicable inspection of malfunctioning item and then repair or replac

TROUBLE DIAGNOSIS
TF-47
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
How to Erase Self-diagnostic Results
1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. Start engine and select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Touch “ERASE” on CONSULT-II screen to erase DTC memory.
CAUTION:
If memory cannot be erased, perform applicable diagnosis.
DATA MONITOR MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer to TF-44, "CONSULT-II SETTING PROCEDURE"
.
2. Touch “DATA MONITOR”.
3. Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed.
NOTE:
When malfunction is detected, CONSULT-II performs REAL-TIME DIAGNOSIS.
Also, any malfunction detected while in this mode will be displayed at real time.
Display Item List
×: Standard –: Not applicable
Monitored item (Unit)Monitor item selection
Remarks
ECU INPUT
SIGNALSMAIN
SIGNALSSELEC-
TION FROM
MENU
VHCL/S SEN·FR [km/h] or [mph]×–×Wheel speed calculated by ABS actuator and
electric unit (control unit).
Signal input with CAN communication line.
VHCL/S SEN·RR [km/h] or [mph]×–×Wheel speed calculated by TCM.
Signal input with CAN communication line.
ENGINE SPEED [rpm]×–×Engine speed calculated by ECM.
Signal input with CAN communication line.
THRTL POS SEN [V]×–×Accelerator pedal position (APP) sensor sig-
nal voltage is displayed.
Signal input with CAN communication line.
FLUID TEMP SE [V]×–×Transfer fluid temperature sensor signal volt-
age is displayed.
BATTERY VOLT [V]×–×Power supply voltage for transfer control unit.
2WD SWITCH [ON/OFF]×–×4WD shift switch status is displayed.
AUTO SWITCH [ON/OFF]×–×4WD shift switch status is displayed.
LOCK SWITCH [ON/OFF]×–×4WD shift switch status is displayed.
(LOCK means 4H of 4WD shift switch.)
4L SW [ON/OFF]×–×4WD shift switch status is displayed.
(4L means 4LO of 4WD shift switch.)
N POSI SW TF [ON/OFF]×–×Neutral-4LO switch signal status is displayed.
ATP SWITCH [ON/OFF]×–×ATP switch signal status is displayed.
WAIT DETCT SW [ON/OFF]×–×Wait detection switch status is displayed.
LINE PRES SW [ON/OFF]×–×Line pressure switch status is displayed.
CL PRES SW [ON / OFF]×–×Clutch pressure switch status is displayed.
N POSI SW AT [ON/OFF]×–×“N” position signal of A/T PNP switch status
is displayed.
Signal input with CAN communication line.
R POSI SW AT [ON/OFF]×–×“R” position signal of A/T PNP switch status
is displayed.
Signal input with CAN communication line.

Page 3191 of 3419

INFINITI QX4 2005 Factory Service Manual TF-48
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
P POSI SW AT [ON/OFF]×–×“P” position signal of A/T PNP switch status is
displayed.
Signal input with CAN communication line.
ABS OPER S

TF-48
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
P POSI SW AT [ON/OFF]×–×“P” position signal of A/T PNP switch status is
displayed.
Signal input with CAN communication line.
ABS OPER SW [ON/OFF]×–×ABS operation signal status is displayed.
Signal input with CAN communication line.
VDC OPER SW [ON/OFF]×–×VDC operation signal status is displayed.
Signal input with CAN communication line.
TCS OPER SW [ON/OFF]×–×TCS operation signal status is displayed.
Signal input with CAN communication line.
THROTTLE POSI [0.0/8] –××Thottle position status is displayed.
Signal input with CAN communication line.
4WD MODE [AUTO/LOCK/2WD/4L] –××Control status of 4WD recognized by transfer
control unit. (AUTO, 4H, 2WD or 4LO)
VHCL/S COMP [km/h] or [mph] –××Vehicle speed recognized by transfer control
unit.
COMP CL TORQ [kgm] –××Calculated torque recognized by transfer
control unit.
DUTY SOLENOID [%] –××Control value of clutch pressure solenoid.
2-4WD SOL [ON/OFF] –××Output condition to 2-4WD solenoid.
2-4WD SOL MON [ON/OFF] – –×Check signal for transfer control unit signal
output.
MOTOR RELAY [ON/OFF] –××Transfer motor relay signal status is dis-
played.
MOTOR RELAY MON [ON/OFF] – –×Check signal for transfer control unit signal
output.
4WD FAIL LAMP [ON/OFF] –××Control status of 4WD warning lamp is dis-
played.
2WD IND [ON/OFF] – –×Control status of 4WD shift indicator lamp
(2WD indicator lamp) is displayed.
AUTO IND [ON/OFF] – –×Control status of 4WD shift indicator lamp
(2WD and AUTO indicator lamp) is displayed.
LOCK IND [ON/OFF] – –×Control status of 4WD shift indicator lamp
(2WD, AUTO and Lock indicator) is dis-
played.
4L IND [ON/OFF] – –×Control status of 4LO indicator lamp is dis-
played.
ATP IND [ON/OFF] – –×Control status of ATP warning lamp is dis-
played.
SHIFT POS SW1 [ON/OFF]×–×Actuator position switch 1 (Low) signal status
is displayed.
SHIFT POS SW2 [ON/OFF]×–×Actuator position switch 2 (high) signal status
is displayed.
SHIFT ACT1 [ON/OFF] –××Output condition to actuator motor (clock-
wise)
SHIFT AC MON1 [ON/OFF]×–×Check signal for transfer control unit signal
output
SHIFT ACT2 [ON/OFF] –××Output condition to actuator motor (counter-
clockwise)
SHIFT AC MON2 [ON/OFF]×–×Check signal for transfer control unit signal
output Monitored item (Unit)Monitor item selection
Remarks
ECU INPUT
SIGNALSMAIN
SIGNALSSELEC-
TION FROM
MENU

Page 3192 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
TF-49
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: October 20052005 QX56
WORK SUPPORT
When there is no problem with transfer and 4WD system, following symptom in “AUTO” mode may be claime

Load next 8 pages

Page: < prev 1-10 ... 3153-3160 3161-3168 3169-3176 3177-3184 3185-3192 3193-3200 3201-3208 3209-3216 3217-3224 ... 3424 next >

towing capacity key fob bonnet ESP inoperative inflation pressure fuel