Nissan Frontier D40. Instruction — part 250
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-21
< COMPONENT DIAGNOSIS >
[TRANSFER: TX15B]
C
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G
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A
B
DLN
N
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COMPONENT DIAGNOSIS
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL
UNIT
Description
INFOID:0000000005275413
The transfer control unit controls the transfer control device which controls shifts between 4H and 4LO and
between 2WD and 4WD. When the vehicle battery is removed, the power supply to the transfer control unit is
interupted, and self-diagnosis memory function is suspended. These DTC's may also set when the power
supply voltage for the transfer control unit is abnormally low while driving.
DTC Logic
INFOID:0000000005275414
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Perform self-diagnosis.
Are DTC's “P1801 or P1811 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005275415
Regarding Wiring Diagram information, refer to
.
1.
CHECK POWER SUPPLY
1.
Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2.
Disconnect transfer control unit harness connector.
3.
Check voltage between transfer control unit harness connector
terminals and ground.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1801]
*INITIAL START*
Due to removal of battery which cuts off
power supply to transfer control unit,
self-diagnosis memory function is sus-
pended.
[P1811]
BATTERY VOLTAGE
Power supply voltage for transfer control
unit is abnormally low while driving.
Connector
Terminal
Voltage (Approx.)
M152
19 - Ground
Battery voltage
25 - Ground
0V
M153
40 - Ground
Battery voltage
44 - Ground
0V
45 - Ground
SDIA3360E
DLN-22
< COMPONENT DIAGNOSIS >
[TRANSFER: TX15B]
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
4.
Turn ignition switch “ON”. (Do not start engine.)
5.
Check voltage between transfer control unit harness connector
terminals and ground.
Is there voltage?
YES
>> GO TO 2.
NO
>>
Check the following. If any items are damaged, repair or replace damaged parts.
• 40A fuse (No. J, located in the fuse and fusible link box).
• 10A fuses (No. 21, located in the fuse block (J/B) and Nos. 57 and 58 located in the fuse and
relay box).
• Harness for short or open between battery and transfer control unit harness connector M152
terminal 19.
• Harness for short or open between battery and transfer shut off relay 2 harness connector E157
terminal 1 and 3.
• Harness for short or open between battery and transfer shut off relay 1 harness connector E156
terminal 3.
• Harness for short or open between ignition switch and transfer control unit harness connector
M152 terminal 25.
• Harness for short or open between ignition switch and transfer shut off relay 1 harness connec-
tor E156 terminal 1.
• Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 5
and transfer control unit harness connector M153 terminals 44, 45.
• Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 5
and transfer control unit harness connector M153 terminals 44, 45.
• Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2
and transfer control unit harness connector M153 terminal 40.
• Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and
ground.
• Battery and ignition switch.
• Transfer shut off relay 1, 2. Refer to
DLN-23, "Component Inspection"
.
2.
CHECK GROUND CIRCUIT
1.
Turn ignition switch “OFF”.
2.
Disconnect transfer control unit harness connector.
3.
Check continuity between transfer control unit harness connec-
tor M152 terminals 6 (M/T models) and 18, and M153 terminal
32 and ground.
Also check harness for short to power.
Do you have continuity?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to power in harness or con-
nectors.
3.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to
Are the inspection results normal?
YES
>> GO TO 4.
Connector
Terminal
Voltage (Approx.)
M152
19 - Ground
Battery voltage
25 - Ground
M153
40 - Ground
44 - Ground
45 - Ground
SDIA3361E
Continuity should exist.
SDIA3362E
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-23
< COMPONENT DIAGNOSIS >
[TRANSFER: TX15B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
NO
>> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
4.
CHECK DTC
Drive vehicle and then perform Self-diagnosis.
Do DTC's P1801 or P1811 display?
YES
>> Replace transfer control unit. Refer to
DLN-94, "Removal and Installation"
.
NO
>> Inspection End.
Component Inspection
INFOID:0000000005275416
1.
Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2.
Remove transfer shut off relay 1 and transfer shut off relay 2. Refer to
DLN-23, "Component Inspection"
.
3.
Apply 12V direct current between transfer shut off relay termi-
nals 1 and 2.
4.
Check continuity between relay terminals 3 and 5.
5.
If inspection results are not normal, replace the transfer shut off
relay 1 or 2.
Condition
Continuity
12V direct current supply between terminals 1 and 2
Yes
OFF
No
SCIA1245E
DLN-24
< COMPONENT DIAGNOSIS >
[TRANSFER: TX15B]
P1802 – P1804, P1809 TRANSFER CONTROL UNIT
P1802 – P1804, P1809 TRANSFER CONTROL UNIT
Description
INFOID:0000000005275417
The transfer control unit controls the transfer control device which controls shifts between 4H and 4LO and
between 2WD and 4WD. A DTC may set when any of the following occur:
• Malfunction is detected in the memory (RAM) system of transfer control unit.
• Malfunction is detected in the memory (ROM) system of transfer control unit.
• Malfunction is detected in the memory (EEPROM) system of transfer control unit.
• AD converter system of transfer control unit is malfunctioning.
DTC Logic
INFOID:0000000005275418
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Perform self-diagnosis.
Are DTC's “P1802 - P1804 or P1809 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005275419
1.
INSPECTION START
Do you have CONSULT-III?
YES or NO
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)
1.
Turn ignition switch “ON”.
2.
Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-III.
3.
Touch “ERASE”.
4.
Turn ignition switch “OFF” and wait at least 10 seconds.
5.
Perform the self-diagnosis again.
Is the “CONTROL UNIT 1 [P1802]”, “CONTROL UNIT 2 [P1803]”, “CONTROL UNIT 3 [P1804]” or CONTROL
UNIT 4 [P1809]” displayed?
YES
>> Replace transfer control unit. Refer to
DLN-94, "Removal and Installation"
.
NO
>> Inspection End.
3.
PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)
1.
Perform the self-diagnosis and then erase self-diagnostic results. Refer to
2.
Perform the self-diagnosis again.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1802]
CONTROL UNIT 1
Malfunction is detected in the memory
(RAM) system of transfer control unit.
[P1803]
CONTROL UNIT 2
Malfunction is detected in the memory
(ROM) system of transfer control unit.
[P1804]
CONTROL UNIT 3
Malfunction is detected in the memory
(EEPROM) system of transfer control
unit.
[P1809]
CONTROL UNIT 4
AD converter system of transfer control
unit is malfunctioning.
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