DTC    P0182    Fuel Temperature Sensor "A" Circuit Low Input

DTC    P0183    Fuel Temperature Sensor "A" Circuit High Input

for Preparation Click here


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. The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via resistor R.
Resistor R and the 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 fuel supply pump and determines if there are errors.
A067628E39

HINT:
When the fuel temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.


P0182, P0183 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine idles for approximately 15 seconds
Open or short in fuel temperature sensor circuit for 2.0 seconds
(1 trip detection logic)
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM

Related Data List 
DTC No.
Data List
P0182
  1. Fuel Temperature
P0183

WIRING DIAGRAM


A199002E03


INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (FUEL TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    OK:
    Same as actual fuel temperature.

    Result 
    Result
    		Proceed to
    -40°C (-40°F)
    		A
    149°C (300°F) or higher
    		B
    Same as actual fuel temperature
    		C

    HINT:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    2. If there is a short circuit, the intelligent tester indicates 149°C (300°F) or higher.



B
Go to step 4

C
Go to step 12
A


2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    A200281E01

  1. Disconnect the fuel temperature sensor connector.

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    Standard:
    149°C (300°F) or higher

    Text in Illustration 
    *1
    		Fuel Temperature Sensor
    *2
    		Front view of wire harness connector
    (to Fuel Temperature Sensor)

  1. Reconnect the fuel temperature sensor connector.



OK
Go to step 7

NG
Go to step 3

3.CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)

  1. Disconnect the fuel temperature sensor connector.



    A199021E01

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B21-1 (THF) - B9-29 (THF)
    		Always
    		Below 1 Ω
    B21-2 (E2) - B9-28 (ETHF)
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Fuel Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the fuel temperature sensor connector.

  1. Reconnect the ECM connector.



OK
Go to step 9

NG
Go to step 8

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    A200307E03

  1. Disconnect the fuel temperature sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    Standard:
    -40°C (-40°F)

    Text in Illustration 
    *1
    		Fuel Temperature Sensor

  1. Reconnect the fuel temperature sensor connector.



OK
Go to step 10

NG
Go to step 5

5.CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)

  1. Disconnect the fuel temperature sensor connector.



    A199021E02

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B21-1 (THF) or B9-29 (THF) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Fuel Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the fuel temperature sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


6.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 12

7.CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE SUPPLY PUMP ASSEMBLY

  1. Replace the supply pump assembly (Click here).



NEXT
Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 12

9.CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 12

10.REPLACE SUPPLY PUMP ASSEMBLY

  1. Replace the supply pump assembly (Click here).


NEXT


11.BLEED AIR FROM FUEL SYSTEM

  1. Bleed air from fuel system (Click here).


NEXT


12.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END