Nissan Titan A60. Manual — part 270
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
DLN-19
< SYSTEM DESCRIPTION >
[TRANSFER: TX15B]
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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting Chart
INFOID:0000000006179431
Use the chart below to help you find the cause of the symptom. The numbers indicate the order of the inspec-
tion. If necessary, repair or replace these parts.
Reference page
SUSPECTED PARTS
(Possible cause)
T
R
ANSFER F
LUID (Level
low)
T
R
ANSFER F
LUID (W
rong)
T
R
ANSFER F
LUID (Level
too high)
LI
QUI
D
GASKET (Dam
ag
ed
)
O-RI
NG (W
orn
or da
ma
ge
d)
OIL
SEAL
(W
orn
or da
ma
ge
d)
S
H
IFT
FO
RK
(W
orn
or d
am
a
ged
)
GEAR (W
orn
o
r da
ma
ge
d)
B
EARING
(W
orn
or
da
ma
ge
d)
Symptom
Noise
1
2
3
3
Transfer fluid leakage
3
1
2
2
2
Hard to shift or will not shift
1
1
2
DLN-20
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TX15B]
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DTC/CIRCUIT DIAGNOSIS
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL
UNIT
Description
INFOID:0000000006179432
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
interrupted, and self-diagnosis memory function is suspended. DTCs P1801, P1811 or flash code 8 may also
set when the power supply voltage for the transfer control unit is abnormally low while driving.
DTC Logic
INFOID:0000000006179433
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Are DTCs P1801, P1811 or flash code 8 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000006179434
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.)
E142
19 - Ground
Battery voltage
25 - Ground
0V
E143
40 - Ground
Battery voltage
44 - Ground
0V
45 - Ground
SDIA3360E
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-21
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TX15B]
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4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check the following. If any items are damaged, repair or replace damaged parts.
• 10A fuses [No. 26 located in the fuse and fusible link box or 59 located in the fuse and relay box]
• 20A fuse [No. 53, located in the IPDM E/R]
• Harness for short or open between battery and transfer control unit harness connector E142 ter-
minal 19.
• Harness for short or open between battery and transfer shut off relay 2 harness connector E47
terminal 1 and 5.
• Harness for short or open between battery and transfer shut off relay 1 harness connector E46
terminal 5.
• Harness for short or open between ignition switch and transfer control unit harness connector
E142 terminal 25.
• Harness for short or open between ignition switch and transfer shut off relay 1 harness connec-
tor E46 terminal 2.
• Harness for short or open between transfer shut off relay 2 harness connector E47 terminal 3
and transfer control unit harness connector E143 terminals 44, 45.
• Harness for short or open between transfer shut off relay 1 harness connector E46 terminal 3
and transfer control unit harness connector E143 terminals 44, 45.
• Harness for short or open between transfer shut off relay 2 harness connector E47 terminal 2
and transfer control unit harness connector E143 terminal 40.
• Harness for open between transfer shut off relay 1 harness connector E46 terminal 1 and
ground.
• Battery and ignition switch.
• Transfer shut off relay 1, 2. Refer to 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 E142 terminals 6 and 18, and E143 terminal 32 and ground.
Also check harness for short to power.
OK or NG
OK
>> GO TO 3.
NG
>> 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
OK or NG
OK
>> GO TO 4.
NG
>> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
Connector
Terminal
Voltage (Approx.)
E142
19 - Ground
Battery voltage
25 - Ground
E143
40 - Ground
44 - Ground
45 - Ground
SDIA3361E
Continuity should exist.
SDIA3362E
DLN-22
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TX15B]
P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
4.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK
>> Inspection End.
NG
>> Replace transfer control unit. Refer to
DLN-93, "Removal and Installation"
Component Inspection
INFOID:0000000006179435
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-12, "Component Parts Loca-
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
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