Nissan Frontier D40. Manual — part 262
TRANSFER CONTROL UNIT
DLN-69
< ECU DIAGNOSIS >
[TRANSFER: TX15B]
C
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A
B
DLN
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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.
[P1802]
CONTROL UNIT (1,2,3)
Malfunction is detected in the memory (RAM) sys-
tem of transfer control unit.
[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.
[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.
[P1809]
CONTROL UNIT 4
AD converter system of transfer control unit is mal-
functioning.
[P1810]
4L POSI SW TF
Improper signal from 4LO switch is input due to
open or short circuit.
[P1811]
BATTERY VOLTAGE
Power supply voltage for transfer control unit is ab-
normally low while driving.
[P1813]
4WD MODE SW
More than two switch inputs are simultaneously de-
tected due to short circuit of 4WD shift switch.
[P1814]
4WD DETECT SWITCH
Improper signal from wait detection switch is input
due to open or short circuit.
[P1816]
PNP SW/CIRC
When transmission range switch (A/T models) sig-
nal is malfunctioning.
When PNP switch (M/T models) signal is malfunc-
tioning.
[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.
[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.
[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.
[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-70
< ECU DIAGNOSIS >
[TRANSFER: TX15B]
TRANSFER CONTROL UNIT
NOTE:
Flashing pattern
Item
Diagnostic item is detected when...
Reference
2
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.
3
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.
4
CAN communication
Malfunction has been detected from CAN
communication.
5
AD converter
AD converter system of transfer control unit is
malfunctioning.
6
4LO switch
Improper signal from 4LO switch is input due
to open or short circuit.
7
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.
8
Power supply
Power supply voltage for transfer control unit is
abnormally low while driving.
9
4WD shift switch
More than two switch inputs are simultaneous-
ly detected due to short circuit of 4WD shift
switch.
10
Wait detection switch
Improper signal from wait detection switch is
input due to open or short circuit.
11
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.
12
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.
13
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.
14
Transmission range
switch signal (A/T mod-
els)
When transmission range switch signal is mal-
functioning.
PNP switch signal (M/T
models)
When PNP switch signal is malfunctioning.
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.
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.
(A/T
models) or
TRANSFER CONTROL UNIT
DLN-71
< ECU DIAGNOSIS >
[TRANSFER: TX15B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
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.)
DLN-72
< SYMPTOM DIAGNOSIS >
[TRANSFER: TX15B]
4WD SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
4WD SYSTEM SYMPTOMS
Symptom Table
INFOID:0000000005275461
Symptom
Condition
Reference page
4WD shift indicator lamp and 4LO indicator lamp do not turn ON (lamp check)
Ignition switch: ON
4WD warning lamp does not turn ON (lamp check)
4WD shift indicator lamp or 4LO indicator lamp does not change
Engine running
ATP warning lamp does not turn ON
ATP switch is malfunctioning
4WD shift indicator lamp repeats flashing
While driving
4WD warning lamp flashes slowly (1 time/2 seconds)
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