Drivetrain. Yaris. Ncp93, 131
U340E Automatic Transmission Transaxle. Yaris. Ncp93, 131
TYPICAL MALFUNCTION THRESHOLDS
INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input |
DTC P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input |
DESCRIPTION
The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value which is input to the ECM.The sensor resistance changes with the transmission fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies a voltage to the temperature sensor through ECM terminal THO1, and the ECM calculates the fluid temperature based on the voltage signal.
- HINT:
- The ATF temperature is likely to increase under conditions such as towing, climbing hills and in heavy traffic.
- When the ATF temperature sensor is normal, the transmission locks up in 4th gear with the shift lever in D and in 3rd gear with the shift lever in 3rd.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0712 | ATF temperature sensor resistance is less than 79 Ω for 0.5 seconds or more (1 trip detection logic). |
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| P0713 | ATF temperature sensor resistance is more than 156 kΩ for 0.5 seconds or more and either of the following conditions is met (1 trip detection logic): |
|
| (A) 10 minutes or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. | ||
| (B) 10 seconds or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (-20.875°F). |
MONITOR DESCRIPTION
The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects opens or shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM turns on the MIL and stores the DTC.*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
- HINT:
- The ATF temperature can be checked on the Techstream display.
MONITOR STRATEGY
| Related DTCs | P0712: ATF temperature sensor/Range check (Low resistance) P0713: ATF temperature sensor/Range check (High resistance) |
| Required sensors/Components | ATF temperature sensor |
| Frequency of operation | Continuous |
| Duration | 0.5 seconds |
| MIL operation | Immediate |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor runs whenever the following DTCs are not present. | None |
- P0713: Range check (High resistance)
One of the following conditions is met: Condition (A) or (B).
| Engine coolant temperature or intake air temperature at engine start | -29.375°C (-20.875°F) or less |
| Time after engine start | 10 minutes or more |
| ECT sensor circuit fail (P0115, P0117, P0118) | Not detected |
| IAT sensor circuit fail (P0112, P0113) | Not detected |
| Engine coolant temperature and intake air temperature at engine start | More than -29.375°C (-20.875°F) |
| Time after engine start | 10 seconds or more |
| ECT sensor circuit fail (P0115, P0117, P0118) | Not detected |
| IAT sensor circuit fail (P0112, P0113) | Not detected |
TYPICAL MALFUNCTION THRESHOLDS
| ATF temperature sensor resistance (ATF temperature sensor output temperature) | Less than 79 Ω (Higher than 164°C (327.2°F)) |
| ATF temperature sensor resistance (ATF temperature sensor output temperature) | More than 156 kΩ (Less than -48°C (-54.4°F)) |
COMPONENT OPERATING RANGE
| ATF temperature | Atmospheric temperature to approximately 130°C (266°F) |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (YARIS_NCP93 RM000000W770OEX.html).
| DATA LIST |
- HINT:
- Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
- NOTICE:
- In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
Warm up the engine.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.
In accordance with the display on the Techstream, read the Data List.
Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/T Oil Temperature 1 ATF Temperature Sensor Value/
min.: -40°C (-40°F)
max.: 215°C (419°F)- Approximately 80°C (176°F): After Stall Test
- Equal to ambient temperature when cold soak
If value is -40°C (-40°F) or 150°C (302°F) or more, ATF temperature sensor circuit is open or short. - HINT:
- When DTC P0712 is output and the Techstream reading is 150°C (302°F) or more, there is a short circuit.
- When DTC P0713 is output and the Techstream reading is -40°C (-40°F), there is an open circuit.
- Measure the resistance between terminal THO1 and the body ground.
Temperature Displayed Malfunction -40°C (-40°F) Open circuit 150°C (302°F) or more Short circuit - HINT:
- If a circuit related to the ATF (Automatic Transmission Fluid) temperature sensor becomes open, P0713 is immediately set (within 0.5 seconds).
- Approximately 80°C (176°F): After Stall Test
| 1.INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) |
 |
Disconnect the transmission wire connector from the transaxle.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 (THO) - 6 (E2) Always 79 Ω to 156 kΩ 1 (THO) - Body ground Always 10 kΩ or higher 6 (E2) - Body ground Always 10 kΩ or higher
Text in Illustration *a Component without harness connected
(Transmission Wire)- HINT:
- If the resistance is outside the specified range at either of the ATF temperatures shown in the table below, the driveability of the vehicle may be affected.
- Standard Resistance:
ATF Temperature Specified Condition 10°C (50°F) 5 to 8 kΩ 25°C (77°F) 2.5 to 4.5 kΩ 110°C (230°F) 0.22 to 0.28 kΩ
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
 |
Connect the transmission wire connector to the transaxle.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C51-95 (THO1) - C51-96 (ETHO) Always 79 Ω to 156 kΩ C51-95 (THO1) - Body ground Always 10 kΩ or higher C51-96 (ETHO) - Body ground Always 10 kΩ or higher
Text in Illustration *a Front view of wire harness connector
(to ECM)
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| OK | ||
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