Infiniti I30 (A33). Manual — part 248
SEF263X
Component Description
NHEC0177
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>
Fuel 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 92
(Fuel tank temperature sensor) and body 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
NHEC0178
Malfunction is detected when an excessively high or low voltage is
sent to ECM, rationally incorrect voltage is sent to ECM, compared
with the voltage signals from engine coolant temperature sensor
and intake air temperature sensor.
Possible Cause
NHEC0489
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Fuel tank temperature sensor
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0180 FUEL TANK TEMPERATURE SENSOR
Component Description
EC-307
DTC Confirmation Procedure
NHEC0179
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
SEF174Y
WITH CONSULT-II
NHEC0179S01
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-310.
If the result is OK, go to following step.
4)
Check “COOLAN TEMP/S” value.
If “COOLAN TEMP/S” is less than 60°C (140°F), the result will
be OK.
If “COOLAN TEMP/S” is above 60°C (140°F), go to the follow-
ing step.
5)
Cool engine down until “COOLAN TEMP/S” is less than 60°C
(140°F).
6)
Wait at least 10 seconds.
7)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-310.
WITH GST
NHEC0179S02
Follow the procedure “With CONSULT-II” above.
DTC P0180 FUEL TANK TEMPERATURE SENSOR
DTC Confirmation Procedure
EC-308
Wiring Diagram
NHEC0180
MEC146D
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0180 FUEL TANK TEMPERATURE SENSOR
Wiring Diagram
EC-309
Diagnostic Procedure
NHEC0181
1
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
SEF263X
3. Turn ignition switch “ON”.
4. Check voltage between fuel level sensor unit and fuel pump terminal 4 and ground with CONSULT-II or tester.
SEF586X
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors B3, M6
I
Harness connectors M81, F49
I
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 5 and body ground. Refer to Wiring
Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to power in harness or connectors.
DTC P0180 FUEL TANK TEMPERATURE SENSOR
Diagnostic Procedure
EC-310
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