Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Transmission Fluid Temperature Sensor "A" Circuit Short To Ground (P071011)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120f (cvt) / Continuously Variable Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Short To Ground (P071011)

DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature into a resistance value for use by the TCM.

The sensor resistance changes with the CVT fluid temperature. As the temperature rises, the sensor resistance decreases. The TCM applies voltage to the temperature sensor through TCM terminal THO1 and calculates the fluid temperature based on the voltage signal.

HINT:

The CVT fluid temperature is likely to increase under conditions such as towing, climbing hills and in traffic.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071011

Transmission Fluid Temperature Sensor "A" Circuit Short To Ground

When the auxiliary battery voltage is 8 V or more and the ignition switch to ON, the CVT fluid temperature sensor voltage is less than 0.142 V for 0.5 seconds (1-trip detection logic).

  • Wire harness or connector
  • Transmission wire (CVT fluid temperature sensor)
  • TCM

Comes on

DTC stored

SAE Code:

P0712

MONITOR DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the TCM determines the CVT fluid temperature and can detect a short to ground in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ω*, the TCM interprets this as a malfunction of the CVT fluid temperature sensor or wiring, illuminates the MIL and stores a DTC.

*: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.

HINT:

The CVT fluid temperature can be checked in the Data List.

MONITOR STRATEGY

Related DTCs

P0712: CVT fluid temperature sensor/Range check (Low voltage)

Required sensors/Components

CVT fluid temperature sensor (TFT sensor)

Frequency of operation

Continuous

Duration

0.5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

None

Auxiliary battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

TFT sensor voltage

(CVT fluid temperature)

Less than 0.142 V

(More than 164°C (327°F))

COMPONENT OPERATING RANGE

CVT fluid temperature sensor (TFT sensor) voltage

0.142 V (164°C (327°F)) to 4.915 V (-48°C (-54°F))

CONFIRMATION DRIVING PATTERN

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and turn the GTS on.
  4. Wait for 3 seconds or more with the ignition switch to ON. [*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  5. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  6. Input the DTC: P071011.
  7. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

  • Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

1.

READ VALUE USING GTS (A/T OIL TEMPERATURE NO.1)

(a) Warm up the engine.

(b) Enter the following menus:

(c) According to the display on the GTS, read the Data List.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Temperature No.1

CVT fluid temperature sensor value

Min.: -40°C (-40°F)

Max.: 150°C (302°F)

  • Approximately 100°C (212°F): After stall speed test
  • Equal to ambient temperature: After cold soak

If the value is -40°C (-40°F) or 150°C (302°F) or more, the CVT fluid temperature sensor circuit is open or shorted.

Powertrain > Transmission > Data List

Tester Display

A/T Oil Temperature No.1

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

B

GO TO STEP 3

A

2.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

3.

INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)

(a) Disconnect the transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

11 (OT+) - 12 (OT-)

Always

79 Ω to 156 kΩ

11 (OT+) - Body ground and other terminals

Always

10 kΩ or higher

12 (OT-) - Body ground and other terminals

Always

10 kΩ or higher

HINT:

If the resistance is out of the specified range at any of the CVT fluid temperatures shown in the table below, the driveability of the vehicle may decrease.

CVT Fluid Temperature

Specified Condition

10°C (50°F)

5.6 to 7.3 kΩ

25°C (77°F)

3.5 kΩ

110°C (230°F)

0.22 to 0.27 kΩ

(c) Connect the transmission wire connector.

NG

REPLACE TRANSMISSION WIRE

OK

4.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

(a) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C80-51 (THO1) - C80-52 (ETHO)

Always

79 Ω to 156 kΩ

C80-51 (THO1) - Body ground and other terminals

Always

10 kΩ or higher

C80-52 (ETHO) - Body ground and other terminals

Always

10 kΩ or higher

(c) Connect the C80 TCM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)

OK

5.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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