DTC    39 (5)    Fuel Temperature Sensor Circuit Malfunction

для подготовки Нажмите здесь


DESCRIPTION

The fuel temperature sensor senses the fuel temperature. A thermistor built into the sensor changes its resistance according to the fuel temperature. The lower the fuel temperature, the higher the thermistor resistance value, and the higher the fuel temperature, the lower the thermistor resistance value (see Fig. 1).
The fuel temperature sensor is connected to the ECM. The 5 V power source voltage from the ECM is applied to the fuel temperature sensor from terminal THF via resistor R. That is, resistor R and the fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes in accordance with changes in the fuel temperature, the voltage at terminal THF also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability when the engine speed is low and the fuel temperature is high.
A009675E06

DTC No.
DTC Detection Condition
Trouble Area
39 (5)
Open or short in the fuel temperature sensor circuit for 0.5 sec. or more.
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM

WIRING DIAGRAM


A009C02E02


INSPECTION PROCEDURE

УКАЗАНИЕ:
  1. If DTCs related to different systems that have terminal E2 as the ground terminal are stored simultaneously, there may be an open circuit between terminal E2 and body ground.
  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.


When using intelligent tester:

1.READ VALUE USING INTELLIGENT TESTER (FUEL TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temp.
    Result 
    Result
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or higher
    		B
    Value is same as actual fuel temperature
    		C

    УКАЗАНИЕ:
    When DTC 39 (5) is stored, the type of malfunction can be determined based on the fuel temperature (see below).

    Result:
    Temperature Displayed
    		Malfunction
    -40°C (-40°F)
    		Open circuit
    140°C (284°F) or higher
    		Short circuit



B
Перейдите к шагу 4

C
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
A


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


    A0095BLE13

  1. Disconnect the fuel temperature sensor connector.

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

  1. Turn the ignition switch to ON.

  1. Read the temperature value on the intelligent tester.

    OK:
    140°C (284°F) or higher

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

  1. Reconnect the fuel temperature sensor connector.



NG
Перейдите к шагу 3
OK

REPLACE FUEL TEMPERATURE SENSOR (Нажмите здесь)  

3.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    A009APXE18

  1. Connect terminals THF and E2 of the ECM connector.

  1. Turn the ignition switch to ON.

  1. Read the temperature value on the intelligent tester.

    OK:
    140°C (284°F) or higher

    Text in Illustration 
    *1
    		Fuel Temperature Sensor
    *2
    		ECM
    *a
    		Component with harness connected
    (ECM)



NG
REPLACE ECM (Нажмите здесь)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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


    A00992KE27

  1. Disconnect the fuel temperature sensor connector.

  1. Turn the ignition switch to ON.

  1. Read the temperature value on the intelligent tester.

    OK:
    -40°C (-40°F)

    Text in Illustration 
    *1
    		Fuel Temperature Sensor
    *2
    		ECM

  1. Reconnect the fuel temperature sensor connector.



NG
Перейдите к шагу 5
OK

REPLACE FUEL TEMPERATURE SENSOR (Нажмите здесь)  

5.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)

  1. Disconnect the ECM connector.

  1. Turn the ignition switch to ON.

  1. Read the temperature value on the intelligent tester.

    OK:
    -40°C (-40°F)

  1. Reconnect the ECM connector.



NG
REPLACE ECM (Нажмите здесь)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR 


When not using intelligent tester:

1.CHECK ECM (THF VOLTAGE)


    A009AF3E94

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    C102-5 (THF) - C102-9 (E2)
    		20°C (68°F)
    		0.2 to 3.8 V
    C102-5 (THF) - C102-9 (E2)
    		80°C (176°F)
    		0.1 to 1.5 V

    Text in Illustration 
    *a
    		Component with harness connected
    (ECM)



NG
Перейдите к шагу 2
OK

CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)  

2.INSPECT FUEL TEMPERATURE SENSOR

  1. Inspect the fuel temperature sensor (See page Нажмите здесь).



NG
REPLACE FUEL TEMPERATURE SENSOR (Нажмите здесь)
OK


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

  1. Disconnect the fuel temperature sensor connector.

  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
    C85-2 - C102-5 (THF)
    		Always
    		Below 1 Ω
    C85-1 - C102-9 (E2)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C85-2 or C102-5 (THF) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel temperature sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Нажмите здесь)