Nissan Frontier D40. Instruction — part 262

TRANSFER CONTROL UNIT

DLN-69

< ECU DIAGNOSIS >

[TRANSFER: TX15B]

DLN

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.)

FLASH CODE CHART

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1801]

*INITIAL START*

Due to removal of battery which cuts off power sup-
ply to transfer control unit, self-diagnosis memory
function is suspended.

DLN-21

[P1802]

CONTROL UNIT (1,2,3)

Malfunction is detected in the memory (RAM) sys-
tem of transfer control unit.

DLN-24

[P1803]

Malfunction is detected in the memory (ROM) sys-
tem of transfer control unit.

[P1804]

Malfunction is detected in the memory (EEPROM)
system of transfer control unit.

[P1807]

VHCL SPEED SEN·AT

• Malfunction is detected in output shaft revolution

signal that is output from TCM through CAN
communication.

• Improper signal is input while driving.

DLN-26

[P1808]

VHCL SPEED SEN·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.

DLN-27

[P1809]

CONTROL UNIT 4

AD converter system of transfer control unit is mal-
functioning.

DLN-24

[P1810]

4L POSI SW TF

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

DLN-28

[P1811]

BATTERY VOLTAGE

Power supply voltage for transfer control unit is ab-
normally low while driving.

DLN-21

[P1813]

4WD MODE SW

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

DLN-31

[P1814]

4WD DETECT SWITCH

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

DLN-34

[P1816]

PNP SW/CIRC

When transmission range switch (A/T models) sig-
nal is malfunctioning.

DLN-37

When PNP switch (M/T models) signal is malfunc-
tioning.

DLN-38

[P1817]

SHIFT ACTUATOR

• 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

or transfer shift low relay.

DLN-41

[P1818]

SHIFT ACT POSI SW

• Improper signal from actuator position switch is

input due to open or short circuit.

• Malfunction is detected in actuator position

switch.

DLN-48

[P1819]

SHIFT ACT CIR

• Malfunction is detected in transfer shut off relay

1 and transfer shut off relay 2.

• Malfunction occurs in transfer control device

drive circuit.

DLN-51

[P1820]

ENGINE SPEED SIG

• Malfunction is detected in engine speed signal

that is output from ECM through CAN communi-
cation.

• Improper signal is input while driving.

DLN-54

DLN-70

< ECU DIAGNOSIS >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

NOTE:

Flashing pattern

Item

Diagnostic item is detected when...

Reference

Output shaft revolution
signal (from TCM)

• Malfunction is detected in output shaft revo-

lution signal that is output from TCM through
CAN communication.

• Improper signal is input while driving.

DLN-26

Vehicle speed signal
(from ABS)

• Malfunction is detected in vehicle speed sig-

nal that is output from ABS actuator and
electric unit (control unit) through CAN com-
munication.

• Improper signal is input while driving.

DLN-27

CAN communication

Malfunction has been detected from CAN
communication.

DLN-14

AD converter

AD converter system of transfer control unit is
malfunctioning.

DLN-24

4LO switch

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

DLN-28

Engine speed signal

• Malfunction is detected in engine speed sig-

nal that is output from ECM through CAN
communication.

• Improper signal is input while driving.

DLN-54

Power supply

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

DLN-21

4WD shift switch

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

DLN-31

Wait detection switch

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

DLN-34

Actuator motor

• Motor does not operate properly due to open

or short circuit in actuator motor.

• Malfunction is detected in the actuator mo-

tor. (When 4WD shift switch is operated and
actuator motor is not operated.)

• Malfunction is detected in transfer shift high

relay or transfer shift low relay.

DLN-41

Actuator position
switch

• Improper signal from actuator position

switch is input due to open or short circuit.

• Malfunction is detected in the actuator posi-

tion switch.

DLN-48

Transfer control device

• Malfunction is detected in transfer shut off

relay 1 and transfer shut off 2.

• Malfunction occurs in transfer control device

drive circuit.

DLN-51

Transmission range
switch signal (A/T mod-
els)

When transmission range switch signal is mal-
functioning.

DLN-37

PNP switch signal (M/T
models)

When PNP switch signal is malfunctioning.

DLN-38

Repeats flickering

every 0.25 sec.

Data erase display

• Power supply failure of memory back-up.
• Battery is disconnected for a long time.
• Battery performance is poor.

DLN-21

Repeats flickering

every 2 to 5 sec.

—

Circuits that the self-diagnosis covers have no
malfunction.

—

No flickering

PNP switch (M/T mod-
els), transmission
range switch (A/T mod-
els) or 4WD shift switch

PNP switch (M/T models), transmission range
switch (A/T models) or 4WD shift switch circuit
is shorted or open.

DLN-38

(M/T models),

DLN-37

(A/T

models) or

DLN-31

TRANSFER CONTROL UNIT

DLN-71

< ECU DIAGNOSIS >

[TRANSFER: TX15B]

DLN

If actuator position switch” or transfer control device” is displayed, first erase self-diagnostic results. (They may be displayed after install-
ing transfer control unit or transfer assembly.)