Nissan Titan. Instruction — part 238
P0181 FTT SENSOR
EC-253
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
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G
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EC
N
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4. Check the voltage between fuel level sensor unit and fuel pump
harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and fuel level sensor unit and fuel pump
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connector.
4.
CHECK FTT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between fuel level sensor unit and fuel pump harness connector and ground.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between fuel level sensor unit and fuel pump and ground
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connector.
6.
CHECK FTT SENSOR
Check FTT sensor. Refer to
EC-253, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace fuel level sensor unit and fuel pump. Refer to
FL-11, "Removal and Installation"
7.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009886659
1.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Remove fuel level sensor unit. Refer to
FL-11, "Removal and Installation"
.
Fuel level sensor unit and fuel pump
Ground
Voltage (V)
Connector
Terminal
C5
4
Ground
Approx. 5
PBIB0932E
Fuel level sensor unit and fuel pump
Ground
Continuity
Connector
Terminal
C5
3
Ground
Existed
EC-254
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0181 FTT SENSOR
4. Check resistance between fuel level sensor unit and fuel pump
terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace fuel level sensor unit and fuel pump. Refer to
FL-11, "Removal and Installation"
Terminals
Condition
Resistance (k
Ω)
4 and 3
Temperature [
°C (°F)]
20 (68)
2.3 – 2.7
50 (122)
0.79 – 0.90
JMBIA0167ZZ
P0182, P0183 FTT SENSOR
EC-255
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0182, P0183 FTT SENSOR
Component Description
INFOID:0000000009886660
The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
<Reference data>
*: These data are reference values and are measured between ECM terminal 107
(Fuel tank temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000009886661
DTC Confirmation Procedure
INFOID:0000000009886662
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Wait at least 5 seconds.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009886663
1.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
BBIA0442E
Fluid temperature
°C (°F)]
Voltage*
(V)
Resistance
(k
Ω)
20 (68)
3.5
2.3 - 2.7
50 (122)
2.2
0.79 - 0.90
SEF012P
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0182
0182
Fuel tank temperature
sensor circuit low input
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Fuel tank temperature sensor
P0183
0183
Fuel tank temperature
sensor circuit high input
An excessively high voltage from the sensor is
sent to ECM.
EC-256
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0182, P0183 FTT SENSOR
2. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3. Turn ignition switch ON.
4. Check voltage between “fuel level sensor unit and fuel pump”
terminal 4 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”
>> Repair harness or connector.
3.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to power in harness or connector.
5.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-257, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace “fuel level sensor unit fuel pump”.
6.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
and
GI-42, "Intermittent Incident"
BBIA0442E
Voltage: Approximately 5V
PBIB0932E
Continuity should exist.
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