Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026PYH |
Model Year Start: 2023 |
Model: Corolla HV |
Prod Date Range: [09/2022 -
] |
Title: HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P274A11,P274A15; Transmission Fluid Temperature Sensor "C" Circuit Short to Ground; 2023 - 2025 MY Corolla HV [09/2022 - ] |
DTC
|
P274A11
|
Transmission Fluid Temperature Sensor "C" Circuit Short to Ground
|
DTC
|
P274A15
|
Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open
|
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:
Motor generator control ECU (MG ECU) internal malfunction
-
Motor generator control ECU (MG ECU) malfunction
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 motor generator control ECU (MG ECU)
-
The connectors are not connected properly
-
Foreign matter or water on the connector terminals
-
Open or short in wire harness
DESCRIPTION
The resistance of the thermistor built into the transmission fluid temperature sensor changes in accordance with changes in the transmission fluid temperature. The lower the transmission fluid temperature, the higher the thermistor resistance. Conversely, the higher the transmission fluid temperature, the lower the resistance.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Warning Indicate
|
Note
|
P274A11
|
Transmission Fluid Temperature Sensor "C" Circuit Short to Ground
|
Short to ground in the transmission fluid temperature sensor circuit
(1 trip detection logic)
|
-
Wire harness or connector
-
Inverter with converter assembly
-
Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)
|
Comes on
|
Master Warning:
Comes on
|
SAE Code:
P274C
|
P274A15
|
Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open
|
Open or short to +B in the transmission fluid temperature sensor circuit
(1 trip detection logic)
|
-
Wire harness or connector
-
Inverter with converter assembly
-
Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)
|
Comes on
|
Master Warning:
Comes on
|
SAE Code:
P274D
|
HINT:
After confirming that DTC P274A11 or P274A15 is output, use the GTS to check "Transaxle Oil Temperature" in the Data List.
Displayed Temperature
|
Malfunction
|
-40°C (-40°F)
|
Open circuit or short to +B
|
215°C (419°F)
|
Short to ground
|
MONITOR DESCRIPTION
If the motor generator control ECU detects a malfunction of the transmission fluid temperature sensor, it will illuminate the MIL and store a DTC.
MONITOR STRATEGY
Related DTCs
|
P274C (INF P274A11): Transmission Fluid Temperature Sensor "C" Circuit Low
P274D (INF P274A15): Transmission Fluid Temperature Sensor "C" Circuit High
|
Required sensors/components
|
Transmission fluid temperature sensor
|
Frequency of operation
|
Continuous
|
Duration
|
TMC's intellectual property
|
MIL operation
|
1 driving cycle
|
Sequence of operation
|
None
|
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not stored
|
TMC's intellectual property
|
Other conditions belong to TMC's intellectual property
|
-
|
TYPICAL MALFUNCTION THRESHOLDS
TMC's intellectual property
|
-
|
COMPONENT OPERATING RANGE
Motor generator control ECU
|
DTC P274C (INF P274A11) is not detected
DTC P274D (INF P274A15) 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
-
Connect the GTS to the DLC3.
-
Turn the ignition switch to ON and turn the GTS 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 GTS on.
-
With ignition switch ON and wait for 5 seconds or more. [*1]
-
Enter the following menus: Powertrain / Motor Generator / 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, perform the normal judgment procedure again.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
Click here
PROCEDURE
1.
|
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY 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
|
A
|
|
|
2.
|
CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR)
|
(a) Check the connection condition of the transmission fluid temperature sensor connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.
Click here
OK:
- The connector is connected securely.
- The terminals are not deformed and are connected securely.
- No water or foreign matter in the connector.
|
|
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
|
A
|
|
|
3.
|
READ VALUE USING GTS (TRANSAXLE OIL TEMPERATURE)
|
(a) Read the Data List.
Powertrain > Motor Generator > Data List
Tester Display
|
Transaxle Oil Temperature
|
Result
|
Proceed to
|
-40°C (-40°F) or 215°C (419°F)
|
A
|
Same as actual temperature
|
B
|
(b) Turn the ignition switch off.
B |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
A
|
|
|
4.
|
INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)
|
(a) Disconnect the transmission fluid temperature sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C92-3 (TTA) - C92-13 (TTAG)
|
Ignition switch off
|
1.3 to 94 kΩ
|
|
|
*a
|
Component without harness connected
(Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))
|
|
|
(c) Reconnect the transmission fluid temperature sensor connector.
OK
|
|
|
5.
|
CHECK HARNESS AND CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - INVERTER WITH CONVERTER ASSEMBLY)
|
(a) Disconnect the transmission fluid temperature sensor connector.
(b) Disconnect the inverter with converter 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
|
C92-3 (TTA) - C148-17 (TTA)
|
Ignition switch off
|
Below 1 Ω
|
C92-13 (TTAG) - C148-11 (TTAG)
|
Ignition switch off
|
Below 1 Ω
|
Standard Resistance (Check for Short):
Tester Connection
|
Condition
|
Specified Condition
|
C92-3 (TTA) or C148-17 (TTA) - Body ground and other terminals
|
Ignition switch off
|
10 kΩ or higher
|
C92-13 (TTAG) or C148-11 (TTAG) - Body ground and other terminals
|
Ignition switch off
|
10 kΩ or higher
|
(d) Reconnect the inverter with converter assembly connector.
(e) Reconnect the transmission fluid temperature sensor connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|