Infiniti QX56 (JA60). Manual — part 383
EC-184
< COMPONENT DIAGNOSIS >
[VK56DE]
P0181 FTT SENSOR
>> Repair open circuit or short to power in harness or connector.
5.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-184, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace “fuel level sensor unit and fuel pump”.
6.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
and
GI-38, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005149200
FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 3 and 4 by heating with hot water as shown in the fig-
ure.
If NG, replace fuel level sensor unit.
Temperature
°C (°F)]
Resistance (k
Ω)
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
SEF476YA
P0182, P0183 FTT SENSOR
EC-185
< COMPONENT 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:0000000005149201
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>
*: This data is reference value 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:0000000005149202
DTC Confirmation Procedure
INFOID:0000000005149203
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
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.
4. Wait at least 5 seconds.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005149204
1.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
BBIA0583E
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-186
< COMPONENT 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-III 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-187, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace “fuel level sensor unit and fuel pump”.
6.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
and
GI-38, "Intermittent Incident"
BBIA0583E
Voltage: Approximately 5 V
PBIB0932E
Continuity should exist.
P0182, P0183 FTT SENSOR
EC-187
< COMPONENT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
>> INSPECTION END
Component Inspection
INFOID:0000000005149205
FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 3 and 4 by heating with hot water as shown in the fig-
ure.
If NG, replace fuel level sensor unit.
Temperature
°C (°F)]
Resistance (k
Ω)
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
SEF476YA
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