DTC    P0712    Transmission Fluid Temperature Sensor "A" Circuit Low Input

DTC    P0713    Transmission Fluid Temperature Sensor "A" Circuit High Input

for Preparation Click here


DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor converts the ATF temperature into a resistance value which is input into the ECM.
The ECM applies a voltage to the temperature sensor through ECM terminal THO1.
The sensor resistance changes with the ATF temperature.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.
The ECM calculates the ATF temperature based on the voltage signal.

DTC Code
DTC Detection Condition
Trouble Area
P0712
ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1 trip detection logic)
  1. Short in ATF temperature sensor circuit
  2. ATF temperature sensor
  3. ECM
P0713
ATF temperature sensor resistance is more than 156 kΩ for 0.5 sec. or more either of the following conditions is met (1 trip detection logic):
(A) 388 sec. or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less.
(B) 10 sec. or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (-20.875°F).
  1. Open in ATF temperature sensor circuit
  2. ATF temperature sensor
  3. ECM

MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.

HINT:
  1. *1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
  2. *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
  3. The ATF temperature can be checked on the Techstream display.

MONITOR STRATEGY


Related DTCs
P0712: ATF temperature sensor/Range check (Low resistance)
P0713: ATF temperature sensor/Range check (High resistance)
Required sensors/Components
ATF temperature sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
Immediately
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


All 
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF
P0712: Range check (Low resistance)

  1. The monitor will run whenever the following DTCs are not present
    		None
P0713: Range check (High resistance)
  1. One of the following conditions is met: Condition (A) or (B)
    2. Condition (A)

    1. The monitor will run whenever this DTC is not present
      		P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit)
      P00AC, P00AD, P0110, P0112, P0113 (IAT (Intake air temperature) sensor circuit)
      Engine coolant temperature or intake air temperature at engine start
      		-29.375°C (-20.875°F) or less
      Time after engine start
      		388 seconds or more
    Condition (B)

    1. The monitor will run whenever this DTC is not present
      		P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit)
      P00AC, P00AD, P0110, P0112, P0113 (IAT (Intake air temperature) sensor circuit)
      Engine coolant temperature and intake air temperature at engine start
      		More than -29.375°C (-20.875°F)
      Time after engine start
      		10 seconds or more

TYPICAL MALFUNCTION THRESHOLDS


P0712: Range check (Low resistance) 
ATF temperature sensor resistance
Less than 79 Ω

P0713: Range check (High resistance) 
ATF temperature sensor resistance
More than 156 kΩ

COMPONENT OPERATING RANGE


ATF temperature sensor resistance
79 Ω to 156 kΩ

WIRING DIAGRAM


C155188E03


INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (Click here).

DATA LIST

HINT:
Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect the Techstream to the DLC3.

  4. Turn the ignition switch to ON.

  5. Turn the Techstream on.

  6. Enter the following menus: Powertrain / Engine and ECT / Data List.

  7. According to the display on the Techstream, read the Data List.

    Engine and ECT: 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    A/T Oil Temperature 1
    		No. 1 ATF temperature sensor value/
    Min.: -40°C (-40°F)
    Max.: 215°C (419°F)
    1. After stall test: Approximately 80°C (176°F)
    2. With engine cold: Equal to ambient temperature
    		If value is -40°C (-40°F) or 215°C (419°F), No. 1 ATF temperature sensor circuit is open or shorted

    HINT:
    When DTC P0712 is output and the Techstream output is 150°C (302°F) or more, there is a short circuit.
    When DTC P0713 is output and the Techstream output is -40°C (-40°F), there is an open circuit.
    Check the temperature displayed on the Techstream in order to check if a malfunction exists.

    Temperature Displayed
    		Malfunction
    -40°C (-40°F)
    		Open circuit
    150°C (302°F) or more
    		Short circuit
    If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 seconds). When P0713 is set, P0711 cannot be detected. It is not necessary to inspect the circuit when P0711 is set.
1.INSPECT NO. 1 TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)


    C159421E19

  1. Disconnect the D63 No. 1 transmission wire connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (OT-) - 9 (OT+)
    		Always
    		79 Ω to 156 kΩ
    1 (OT-) - Body ground
    		Always
    		10 kΩ or higher
    9 (OT+) - Body ground
    		Always
    		10 kΩ or higher

    HINT:
    If the resistance is out of the specified range at one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.

    Resistance (Reference):
    ATF Temperature
    		Specified Condition
    10°C (50°F)
    		5 to 8 kΩ
    25°C (77°F)
    		2.5 to 4.5 kΩ
    110°C (230°F)
    		0.22 to 0.28 kΩ


NG
REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR) (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)


    C159422E02

  1. Disconnect the D74 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D74-122 (THO1) - D74-98 (ETHA)
    		Always
    		79 Ω to 156 kΩ
    D74-122 (THO1) - Body ground
    		Always
    		10 kΩ or higher
    D74-98 (ETHA) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)