- Generator Temperature
- Motor Temperature
- Transaxle Oil Temperature
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001N402 |
| Model Year Start: 2021 | Model: Corolla | Prod Date Range: [04/2020 - 09/2022] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P274A1C,P274A1F; Transmission Fluid Temperature Sensor "C" Voltage Out of Range; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022] | ||
|
DTC |
P274A1C |
Transmission Fluid Temperature Sensor "C" Voltage Out of Range |
|
DTC |
P274A1F |
Transmission Fluid Temperature Sensor "C" Circuit Intermittent |
DTC SUMMARY
MALFUNCTION DESCRIPTION
These DTCs are stored when the transmission fluid temperature sensor output is abnormal. The cause of this malfunction may be one of the following:
Transmission fluid temperature sensor malfunction
- Internal transmission fluid temperature sensor malfunction
- Open or short in transmission fluid temperature sensor
Wire harness between the transmission fluid temperature sensor and hybrid vehicle control ECU
- The connectors are not connected properly
- Foreign matter or water on the connector terminals
- Open or short in wire harness
DESCRIPTION
Refer to the description for DTC P274A11.
Click here
![2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P274A11,P274A15; Transmission Fluid Temperature Sensor "C" Circuit Short to Ground+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
|---|---|---|---|---|---|
|
P274A1C |
Transmission Fluid Temperature Sensor "C" Voltage Out of Range |
After a long soak, the value of the transmission fluid temperature sensor is different from the value of the other temperature sensors. (2 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
|
P274A1F |
Transmission Fluid Temperature Sensor "C" Circuit Intermittent |
Sudden change in transmission fluid temperature sensor output or hunting: Unusual sudden change in transmission fluid temperature sensor output occurs and offset condition continues for a certain period of time, or unusual change in transmission fluid temperature sensor output occurs repeatedly. (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P274A1C |
|
|
P274A1F |
Transaxle Oil Temperature |
MONITOR DESCRIPTION
If the hybrid vehicle control ECU detects a malfunction of the transmission fluid temperature sensor, it will illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P274B (INF P274A1C): Transmission Fluid Temperature Sensor "C" Circuit Range/Performance P274E (INF P274A1F): Transmission Fluid Temperature Sensor "C" Circuit Intermittent |
|
Required sensors/components |
Transmission fluid temperature sensor |
|
Frequency of operation |
Continuous |
|
Duration |
TMC's intellectual property |
|
MIL operation |
2 driving cycle / 1 driving cycle |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
The monitor will run whenever the following DTCs are not present |
TMC's intellectual property |
|
Other conditions belong to TMC's intellectual property |
- |
TYPICAL MALFUNCTION THRESHOLDS
|
TMC's intellectual property |
- |
COMPONENT OPERATING RANGE
|
Hybrid vehicle control ECU |
DTC P274B (INF P274A1C) is not detected DTC P274E (INF P274A1F) is not detected |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
DTC P274A1C
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off.
- Leave the vehicle as is for 5 hours or more and then check the values of the Data List items "Generator Temperature", "Motor Temperature" and "Transaxle Oil Temperature". [*1]
-
Turn the power switch on (IG) and turn the Techstream on. [*2]
HINT:
[*1] to [*2]: 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 / Hybrid Control / Utility / All Readiness.
-
Check the DTC judgment result.
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.
DTC P274A1F
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
-
With power switch on (IG) and wait for 5 seconds or more. [*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 / Hybrid Control / Utility / All Readiness.
-
Check the DTC judgment result.
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
Refer to the wiring diagram for DTC P274A11.
Click here
PROCEDURE
|
1. |
CHECK DTC OUTPUT (ENGINE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Enter the following menus: Powertrain / Engine / Trouble Codes.
(d) Check for DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
No DTCs are output, or DTCs except the ones in the table below are also output |
A |
|
Any of the following DTCs are also output |
B |
|
Relevant DTC |
|
|---|---|
|
P261029 |
ECM/PCM Engine Off Timer Performance Signal Invalid |
(e) Turn the power switch off.
| B |
|
|
|
2. |
CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
No DTCs are output, or DTCs except the ones in the table below are also output |
A |
|
Any of the following DTCs are also output |
B |
|
Relevant DTC |
|
|---|---|
|
P274A11 |
Transmission Fluid Temperature Sensor "C" Circuit Short to Ground |
|
P274A15 |
Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open |
(e) Turn the power switch off.
| B |
|
|
|
3. |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
Click here
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (The connector is not connected securely.) |
B |
|
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) |
C |
| B |
|
CONNECT SECURELY |
| C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the A57 hybrid vehicle control ECU connector.
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(c) Reconnect the A57 hybrid vehicle control ECU connector.
| NG |
|
|
|
5. |
CHECK CONNECTOR CONNECTION CONDITION (INTERMEDIATE CONNECTOR) |
Click here
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (The connector is not connected securely.) |
B |
|
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) |
C |
| B |
|
CONNECT SECURELY |
| C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
(b) Disconnect the A57 hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
HINT:
When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
CA1-10 - A57-40 (TTA) |
Power switch off |
Below 1 Ω |
|
CA1-11 - A57-39 (ETTA) |
Power switch off |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
CA1-10 or A57-40 (TTA) - Body ground and other terminals |
Power switch off |
10 kΩ or higher |
|
CA1-11 or A57-39 (ETTA) - Body ground and other terminals |
Power switch off |
10 kΩ or higher |
(d) Reconnect the A57 hybrid vehicle control ECU connector.
(e) Reconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR) |
Click here
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (The connector is not connected securely.) |
B |
|
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) |
C |
| B |
|
CONNECT SECURELY |
| C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - TRANSMISSION FLUID TEMPERATURE SENSOR) |
(a) Disconnect the C92 transmission fluid temperature sensor connector.
(b) Disconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
CA1-10 - C92-3 (TTA) |
Power switch off |
Below 1 Ω |
|
CA1-11 - C92-13 (ETTA) |
Power switch off |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
CA1-10 or C92-3 (TTA) - Body ground and other terminals |
Power switch off |
10 kΩ or higher |
|
CA1-11 or C92-13 (ETTA) - Body ground and other terminals |
Power switch off |
10 kΩ or higher |
(d) Reconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
(e) Reconnect the C92 transmission fluid temperature sensor connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
9. |
INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR) |
(a) Disconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
CA1-10 - CA1-11 |
Power switch off |
1.393 to 75.8 kΩ |
(c) Reconnect the CA1 No. 1 engine room relay block and No. 1 junction block assembly connector.
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY) |
|
|
10. |
INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR) |
Click here
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - TRANSMISSION FLUID TEMPERATURE SENSOR) |
| NG |
|
|
|