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Infiniti QX56 (JA60). Manual - part 294

TRANSFER CONTROL UNIT

DLN-99

< ECU DIAGNOSIS >

[ATX14B]

DLN

CAUTION:

• If CAN COMM CIRCUIT [U1000] or CONTROL UNIT (CAN) [U1010] is displayed with other DTCs, first perform the trouble

diagnosis for CAN communication line.

• If 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 [P1807] 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 position on

transmission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.

FLASH CODE CHART

[P1826]

OIL TEMP SEN

Signal voltage from transfer fluid temperature sen-
sor is abnormally high (Transfer fluid temperature is
abnormally low) while driving.

Refer to

DLN-68

[P1827]

CLUTCH PRES SW

• Improper signal from clutch pressure switch is in-

put due to open or short circuit.

• Malfunction occurs in clutch pressure switch or

hydraulic circuit.

Refer to

DLN-71

[P1828]

LINE PRES SW

• Improper signal from line pressure switch is input

due to open or short circuit.

• Malfunction occurs in line pressure switch or hy-

draulic circuit.

Refer to

DLN-74

[P1829]

THROTTLE POSI SEN

• Malfunction is detected in accelerator pedal posi-

tion signal that is output from ECM through CAN
communication.

• Signal voltage from accelerator pedal position

sensor is abnormally high or low.

Refer to

DLN-77

[P1830]

ABS OP SIG

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

Refer to

DLN-78

[P1831]

VDC OP SIG

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

Refer to

DLN-79

[P1832]

TCS OP SIG

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

Refer to

DLN-80

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

Flashing pattern

Item

Diagnostic item is detected when...

Reference

Vehicle speed signal
(from A/T)

• Malfunction is detected in output shaft revolution signal

that is output from TCM through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-27

Clutch pressure sole-
noid signal

Proper voltage is not applied to clutch pressure solenoid
valve due to open or short circuit.

Refer to

DLN-54

2-4WD solenoid signal

Proper voltage is not applied to 2-4WD solenoid valve due
to open or short circuit.

Refer to

DLN-58

Transfer motor

Transfer motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay.

Refer to

DLN-62

Vehicle speed signal
(from ABS)

• Malfunction is detected in vehicle speed signal that is out-

put from ABS actuator and electric unit (control unit)
through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-28

CAN communication

Malfunction has been detected from CAN communication
line.

Refer to

LAN-14

AD converter

AD converter system of transfer control unit is malfunction-
ing.

Refer to

DLN-25

DLN-100

< ECU DIAGNOSIS >

[ATX14B]

TRANSFER CONTROL UNIT

Transfer fluid tempera-
ture

Signal voltage from transfer fluid temperature sensor is ab-
normally high (Transfer fluid temperature is abnormally low)
while driving.

Refer to

DLN-68

Neutral-4LO switch

Improper signal from neutral-4LO switch is input due to
open or short circuit.

Refer to

DLN-29

Clutch pressure switch

• Improper signal is input due to open or short circuit.
• Malfunction occurs in clutch pressure switch or hydraulic

circuit.

Refer to

DLN-71

Line pressure switch

• Improper signal is input due to open or short circuit.
• Malfunction occurs in line pressure switch or hydraulic

circuit.

Refer to

DLN-74

Engine speed signal
(from ECM)

• Malfunction is detected in engine speed signal that is out-

put from ECM through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-53

Accelerator pedal posi-
tion sensor (from
ECM)

• Malfunction is detected in accelerator pedal position sig-

nal that is output from ECM through CAN communication.

• Signal voltage from accelerator pedal position sensor is

abnormally high or low.

Refer to

DLN-77

Power supply

Power supply voltage for transfer control unit is abnormally
low while driving.

Refer to

DLN-22

4WD shift switch

More than two switch inputs are simultaneously detected
due to short circuit of 4WD shift switch.

Refer to

DLN-32

ABS operation signal
(from ABS)

Malfunction is detected in ABS operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-78

Wait detection switch

Improper signal from wait detection switch is input due to
open or short circuit.

Refer to

DLN-36

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.

Refer to

DLN-40

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.

Refer to

DLN-46

Actuator circuit

• Transfer control device actuator circuit is shorted or open.

(Malfunctions are detected when motor relay circuit is
open/shorted or relay transfer shift circuit is open/short-
ed.)

• Malfunction occurs in transfer control device drive circuit.

Refer to

DLN-49

VDC operation signal
(from VDC)

Malfunction is detected in VDC operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-79

TCS operation signal
(from TCS)

Malfunction is detected in TCS operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-80

Transmission range
switch signal (from
TCM)

When transmission range switch signal is malfunction or
communication error between the vehicles.

Refer to

DLN-39

Repeats flickering
every 2 to 5 sec.

—

System normal.

Refer to

DLN-102

Flashing pattern

Item

Diagnostic item is detected when...

Reference

TRANSFER CONTROL UNIT

DLN-101

< ECU DIAGNOSIS >

[ATX14B]

DLN

CAUTION:

• If CAN communication is displayed with other DTCs, first perform the trouble diagnosis for CAN communication line.
• If ABS operation signal, VDC operation signal or TCS operation signal is displayed, first perform the trouble diagnosis for

ABS system.

• If Output shaft revolution signal is displayed, first perform the trouble diagnosis for A/T system.
NOTE:
• If actuator position switch or actuator circuit is displayed, first erase self-diagnostic results. (Actuator position switch or actuator circuit

may be displayed after installing transfer control unit or transfer assembly.)

• If clutch pressure switch or line pressure switch is displayed only while driving in reverse, check the continuity of R position on trans-

mission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.

Repeats flickering
every 0.25 sec.

Data erase display

• Power supply failure of memory back-up.
• Battery performance is poor.

Refer to

DLN-22

No flickering

Transmission range
switch or 4WD shift
switch

Transmission range switch or 4WD shift switch circuit is
shorted or open.

Refer to