Nissan Sentra. Manual — part 390
EC-256
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009758504
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 6.
2.
CHECK DTC WITH COMBINATION METER
Check DTC with combination meter. Refer to
MWI-17, "CONSULT Function (METER/M&A)"
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Proceed to
3.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER
1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Turn ignition switch ON.
4. Check the voltage between fuel level sensor unit and fuel pump harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness
connector.
4. Also check harness for short to ground and to power.
Fuel level sensor unit
and fuel pump
Condition
Resistance (k
Ω)
+
−
Terminal
4
5
Temperature [
°C
(
°F)]
20 (68)
2.3 – 2.7
50 (122)
0.79 – 0.90
JMBIA0167ZZ
+
−
Voltage
(Approx.)
Fuel level sensor unit and fuel pump
Connector
Terminal
B48
4
Ground
5 V
+
-
Continuity
Fuel level sensor unit and
fuel pump
ECM
Connector
Terminal
Connector
Terminal
B48
4
E16
125
Existed
P0181 FTT SENSOR
EC-257
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
5.
CHECK FTT SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness
connector.
4. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR
Check the FTT sensor. Refer to
EC-257, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace fuel level sensor unit and fuel pump. Refer to
FL-6, "Removal and Installation"
Component Inspection
INFOID:0000000009758505
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-6, "Removal and Installation"
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-6, "Removal and Installation"
+
-
Continuity
Fuel level sensor unit and
fuel pump
ECM
Connector
Terminal
Connector
Terminal
B48
5
E16
124
Existed
Fuel level sensor unit
and fuel pump
Condition
Resistance (k
Ω)
+
−
Terminal
4
5
Temperature
[
°C (°F)]
20 (68)
2.3 – 2.7
50 (122)
0.79 – 0.90
JMBIA0167ZZ
EC-258
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0182, P0183 FTT SENSOR
P0182, P0183 FTT SENSOR
DTC Logic
INFOID:0000000009758506
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758507
1.
CHECK DTC WITH COMBINATION METER
MWI-17, "CONSULT Function (METER/M&A)"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
2.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Turn ignition switch ON.
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.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0182
FTT SEN/CIRCUIT
(Fuel temperature sensor
″A″ circuit low)
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The FTT sensor circuit is open or
shorted.)
• Fuel tank temperature sensor
• Combination meter
P0183
FTT SEN/CIRCUIT
(Fuel temperature sensor
″A″ circuit high)
An excessively high voltage from the sensor is
sent to ECM.
+
−
Voltage
(Approx.)
Fuel level sensor unit and fuel
pump
Connector
Terminal
B48
4
Ground
5 V
P0182, P0183 FTT SENSOR
EC-259
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness
connector.
4. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
4.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness
connector.
4. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK FUEL TANK TEMPERATURE (FTT) SENSOR
Check the FTT sensor. Refer to
EC-259, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-6, "Removal and Installation"
.
Component Inspection
INFOID:0000000009758508
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-6, "Removal and Installation"
+
−
Continuity
Fuel level sensor unit and
fuel pump
ECM
Connector
Terminal
Connector
Terminal
B48
4
E16
125
Existed
+
−
Continuity
Fuel level sensor unit and
fuel pump
ECM
Connector
Terminal
Connector
Terminal
B48
5
E16
124
Existed
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