DTC P0180 DTC P0182 DTC P0183 2AD-FHV

DTC P0180 Fuel Temperature Sensor "A" Circuit

DTC P0182 Fuel Temperature Sensor "A" Circuit Low Input

DTC P0183 Fuel Temperature Sensor "A" Circuit High Input

 

Description

The fuel temperature sensor monitors the fuel temperature. The fuel temperature sensor has a thermistor that varies its resistance depending on the fuel temperature. When the fuel temperature is low, the resistance of the thermistor is high. When the temperature is high, the resistance is low. The variations of resistance are communicated to the ECM as changes of voltage (see Fig. 1).
The fuel temperature sensor is connected to the ECM (see below). The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via resistor R.
The resistor R and fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes due to a change of fuel temperature, the voltage at terminal THF also changes. Based on this signal, the ECM corrects the pressure control compensation of the supply pump and determines errors.
Description DTC P0180, >DTC P0182, DTC P0183
Toyota fault code list DTC P0180 DTC P0182 DTC P0183 2AD-FHV

DTC No. DTC Detection Condition Trouble Area
P0180 Open or short in fuel temperature sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM
P0182 Short in fuel temperature sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM
P0183 Open in fuel temperature sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM

Wiring diagram


Wiring diagram DTC P0180, >DTC P0182, DTC P0183

Inspection procedure

 

NOTICE:

After replacing the ECM, the new ECM needs registration and initialization.

HINT:

If DTCs relating to different systems are output, and they share terminal E2 as their ground, check this ground circuit first.

 

1.READ VALUE USING INTELLIGENT TESTER (FUEL TEMPERATURE SENSOR)
  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch on (IG) and turn the tester ON.

  3. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temp.

  4. Read the value.

     

    Standard value:

    Same value as the actual fuel temperature

     

     

    Result:
    Temperature Displayed Proceed to
    -40°C (-40°F) A
    140°C (284°F) or more B
    OK (Same as actual fuel temperature) C

    HINT:

    1. If there is an open circuit, the tester indicates -40°C (-40°F).
    2. If there is a short circuit, the tester indicates 140°C (284°F) or more.

 

  B  
Go to step 4
 
  C  
CHECK FOR INTERMITTENT PROBLEMS
 
A  
   
2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
Read value using intelligent tester
  1. Disconnect the B47 fuel temperature sensor connector.

  2. Connect terminals 1 and 2 of the fuel temperature sensor wire harness side connector.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the ignition switch on (IG) and turn the tester ON.

  5. Enter the following menu: Powertrain / Engine and ECT / Data List / Fuel Temp.

  6. Read the value.

     

    Standard value:

    140°C (284°F) or more

  7. Reconnect the fuel temperature sensor connector.

 

  OK  
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE FUEL TEMPERATURE SENSOR
 
NG  
   
3.CHECK WIRE HARNESS (FUEL TEMPERATURE SENSOR - ECM)
Check wire harness (fuel temperature sensor - ecm)
  1. Disconnect the B47 fuel temperature sensor connector.

  2. Disconnect the B32 ECM connector.

  3. Measure the resistance of the wire harness side connectors.

     

    Standard resistance:

    Tester Connection Specified Condition
    B47-2 - B32-112 (THF) Below 1 ?
    B47-1 - B32-89 (ETHF) Below 1 ?
  4. Reconnect the fuel temperature sensor.

  5. Reconnect the ECM connector.

 

  OK  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
NG  
   
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 
4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
Read value using intelligent tester (check for short in wire harness)
  1. Disconnect the B47 fuel temperature sensor connector.

  2. Connect the intelligent tester to the DLC3.

  3. Turn the ignition switch on (IG) and turn the tester ON.

  4. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temp.

  5. Read the value.

     

    Standard value:

    -40°C (-40°F) or more.

  6. Reconnect the fuel temperature sensor connector.

 

  OK  
REPLACE FUEL TEMPERATURE SENSOR
 
NG  
   
5.CHECK WIRE HARNESS (FUEL TEMPERATURE SENSOR - ECM)
Check wire harness (fuel temperature sensor - ecm)
  1. Disconnect the B47 fuel temperature sensor connector.

  2. Disconnect the B32 ECM connector.

  3. Measure the resistance of the wire harness side connectors.

     

    Standard resistance:

    Tester Connection Specified Condition
    B47-2 or B32-112 (THF)- Body ground 10 k? or higher
  4. Reconnect the fuel temperature sensor connector.

  5. Reconnect the ECM connector.

 

  OK  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
NG  
   
REPLACE ECM