Infiniti FX35 / FX45. Manual — part 383
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-293
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK or NG
OK (Does not drip.)>>GO TO 11.
NG (Drips.)>>Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.
11.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
EC-294
< SERVICE INFORMATION >
[VQ35DE]
DTC P0181 FTT SENSOR
DTC P0181 FTT SENSOR
Component Description
INFOID:0000000001326109
The fuel tank temperature (FTT) sensor is used to detect the fuel
temperature inside the fuel tank. The sensor modifies a voltage sig-
nal from the ECM. The modified signal returns to the ECM as the
fuel temperature input. The sensor uses a thermistor which is sensi-
tive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.
<Reference data>
*: This data is reference values and is 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:0000000001326110
DTC Confirmation Procedure
INFOID:0000000001326111
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.
WITH CONSULT-III
1.
Turn ignition switch ON and wait at least 10 seconds.
2.
Wait at least 10 seconds.
If 1st trip DTC is detected, go to
If 1st trip DTC is not detected, go to following step.
3.
Select “DATA MONITOR” mode with CONSULT-III.
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 following step.
5.
Cool engine down until “COOLAN TEMP/S” is less than 60
°
C (140
°
F).
6.
Wait at least 10 seconds.
7.
Check 1st trip DTC.
PBIB1572E
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
P0181
0181
Fuel tank temperature
sensor circuit range/per-
formance
Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signals
from engine coolant temperature sensor and in-
take air temperature sensor.
• Harness or connectors
(Fuel tank temperature sensor circuit is
open or shorted)
• Fuel tank temperature sensor
• Unified meter and A/C amp.
DTC P0181 FTT SENSOR
EC-295
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
8.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Wiring Diagram
INFOID:0000000001326112
TBWM1386E
EC-296
< SERVICE INFORMATION >
[VQ35DE]
DTC P0181 FTT SENSOR
Diagnosis Procedure
INFOID:0000000001326113
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
DI-27, "CONSULT-III Function (METER/M&A)"
OK or NG
OK
>> GO TO 3.
NG
>> Go to
DI-19, "Fuel Level Sensor Signal Inspection"
3.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
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-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B1, M11
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”
>> Repair open circuit or short to ground or short to power in harness or connector.
PBIB2625E
PBIB1572E
Voltage: Approximately 5V
PBIB0932E
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