K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P0712,P0713; Transmission Fluid Temperature Sensor "A" Circuit Low Input; 2020 - 2023 MY Corolla Corolla Hatchback [01/2019

The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is detected by the ECM.

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

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

DTC Detection Condition Patterns (P0713):

MONITOR DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the ECM determines the CVT fluid temperature and can detect an open or short in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a malfunction of the CVT fluid temperature sensor or wiring, illuminates the MIL and stores a DTC.

*1: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.

*2: -40°C (-40°F) is indicated regardless of the actual CVT fluid temperature.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

P0712:

P0713 Condition (A):

P0713 Condition (B):

TYPICAL MALFUNCTION THRESHOLDS

P0712:

P0713:

COMPONENT OPERATING RANGE

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

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
Wait for 10 minutes or more with the engine running. [*1]
HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0712 or P0713.

Check the DTC judgment result.

Techstream 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 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

Powertrain > Engine and ECT > Data List

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.