Infiniti Q45 (FY33). Manual — part 182
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SEF394WA
Fuel Tank Temperature Sensor
COMPONENT DESCRIPTION
The fuel tank temperature sensor is used to detect the fuel tem-
perature inside the fuel tank. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the fuel
temperature input. The sensor uses a thermistor which is sensitive
to the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.
SEF012P
<Reference data>
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
*: These data are reference values and are measured between ECM terminal
q
91
(Fuel tank temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage.
Doing so may result in damage to the ECM’s transistor. Use a
ground other than ECM terminals such as the body ground.
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when ...
Check Items
(Possible Causes)
P0180
0402
I
An excessively high or low voltage is sent to ECM.
I
Rationally incorrect voltage is sent to ECM, compared
with the voltage signals from engine coolant tempera-
ture sensor and intake air temperature sensor.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Fuel tank temperature sensor
SEF392X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 10 seconds.
If the result is NG, go to “DIAGNOSTIC PROCEDURE”,
EC-260.
If the result is OK, go to following step.
NOTE:
If “COOLAN TEMP/S” is already less than 90°C (194°F)
before step 4), the result will be OK.
If “COOLAN TEMP/S” is above 90°C (194°F), go to the
following step.
4) Cool engine down until “COOLAN TEMP/S” is less than
90°C (194°F).
5) Wait at least 10 seconds.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-260.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0180
EC-257
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P0180
Fuel Tank Temperature Sensor (Cont’d)
EC-258
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TEC055M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0180
Fuel Tank Temperature Sensor (Cont’d)
EC-259
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SEF394WA
SEF403U
SEF404U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect fuel tank temperature sensor
harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
2
and
ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK
E
NG
Check the following.
I
Harness connectors
B65
,
B178
I
Harness connectors
B102
,
F64
I
Harness for open or short
between ECM and fuel
tank temperature sensor
If NG, repair harness or
connector.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Check harness continuity between termi-
nal
q
4
and body ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
F64
,
B102
I
Harness connectors
B178
,
B65
I
Harness connectors
F63
,
M49
,
M4
,
B3
I
Joint connector-16
I
Harness for open or short
between ECM and sensor
I
Harness for open or short
between TCM (Transmis-
sion control module) and
sensor
I
Harness for open or short
between fuel tank tem-
perature sensor and
throttle actuator control
(TAC) module
If NG, repair harness or
connectors.
CHECK COMPONENT
(Fuel tank temperature sensor).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace fuel tank tempera-
ture sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
TROUBLE DIAGNOSIS FOR DTC P0180
Fuel Tank Temperature Sensor (Cont’d)
H
H
H
H
H
EC-260
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