- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000002B35A |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P071011; Transmission Fluid Temperature Sensor "A" Circuit Short To Ground; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P071011 |
Transmission Fluid Temperature Sensor "A" Circuit Short To Ground |
DESCRIPTION
The CVT fluid temperature sensor converts the CVT fluid temperature into a resistance value for use 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 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 |
DTC Output from |
Priority |
Note |
|---|---|---|---|---|---|---|---|
|
P071011 |
Transmission Fluid Temperature Sensor "A" Circuit Short To Ground |
When the battery voltage is 8 V or more and the ignition switch is ON, the CVT fluid temperature sensor voltage is less than 0.142 V for 0.5 seconds (1-trip detection logic). |
|
Comes on |
Engine |
A |
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 ECM 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 ECM 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 |
|
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 153°C (307°F)) |
COMPONENT OPERATING RANGE
|
CVT fluid temperature sensor (TFT sensor) resistance |
79 Ω to 156 kΩ |
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
![2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- 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.
-
Wait for 3 seconds or more with the ignition switch ON. [*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 / Utility / All Readiness.
- Input the DTC: P071011.
-
Check the DTC judgment result.
GTS Display
Description
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) |
Pre-procedure1
(a) Warm up the engine.
Procedure1
(b) According to the display on the GTS, read the Data List.
Powertrain > Engine > 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) or Invalid Value |
|
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 > Engine > 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 |
Post-procedure1
(c) None
| B |
|
|
|
2. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
3. |
INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR) |
Pre-procedure1
(a) Disconnect the C61 transmission wire connector.
Procedure1
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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.
Result:
|
|
Post-procedure1
(c) Connect the C61 transmission wire connector.
| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Pre-procedure1
(a) Disconnect the C160 ECM connector.
Procedure1
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C160-126 (THO1) - C160-125 (ETHO) |
Always |
0.079 to 156 kΩ |
|
C160-126 (THO1) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C160-125 (ETHO) - Body ground and other terminals |
Always |
10 kΩ or higher |
Post-procedure1
(c) Connect the C160 ECM connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
|
|
5. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|