Nissan GT-R (R35) · Service Manual ENGINE

P0181 FTT SENSOR

VR38

P0181

Description


The fuel tank temperature sensor is used to detect the fuel temperature 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 thermistor decreases as temperature increases.

SEF012P.JPG
<Reference data>

Fluid temperature [°C (°F)]
Voltage* (V)
Resistance (kΩ)
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 terminals 42 (Fuel tank temperature sensor) and 128 (sensor ground).

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P0181
 		Fuel tank temperature sensor circuit range/performance
 		Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from engine coolant temperature sensor and intake air temperature sensor.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Fuel tank temperature sensor

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE-I
 
 3.CHECK ENGINE COOLANT TEMPERATURE
 
 4.PERFORM DTC CONFIRMATION PROCEDURE-II

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK DTC WITH “COMBINATION METER”
 
 3.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
 
 4.DETECT MALFUNCTIONING PART
 
 5.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
 
 6.DETECT MALFUNCTIONING PART
 
 7.CHECK FUEL TANK TEMPERATURE SENSOR
 
 8.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK FUEL TANK TEMPERATURE SENSOR