Drivetrain. Corolla. Zre142 Aze141
U341E Automatic Transmission Transaxle. Corolla. Zre142 Aze141
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 into the ECM.The ECM applies a voltage to the temperature sensor through ECM terminal THO1 (THO).
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The ECM calculates the fluid temperature based on the voltage signal.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0712 | ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1-trip detection logic) |
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| P0713 | ATF temperature sensor resistance is more than 156 kΩ when 15 minutes or more have elapsed after the engine start DTC is detected for 0.5 sec. or more (1-trip detection logic) |
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MONITOR DESCRIPTION
These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor (TFT sensor) circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or a short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn on the MIL and store 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 (TFT*1 sensor) |
| Frequency of operation | Continuous |
| Duration | 0.45 seconds |
| MIL operation | Immediate |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
P0712: Range check (Low resistance) The monitor will run whenever these DTCs are not present. None Battery voltage 8 V or more Ignition switch ON
P0713: Range check (High resistance)
- One of the following conditions is met: Condition (A) or (B)
Condition (A) Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start -29.375°C (-20.875°F) or less Time after engine start 600 seconds or more ECT sensor circuit fail (P0115, P0117, P0118) Not detected IAT sensor circuit fail (P0112, P0113) Not detected Condition (B) Engine coolant temperature (ECT) or intake air temperature (IAT) 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 (TFT sensor) resistance | Less than 79 Ω |
| ATF temperature sensor (TFT sensor) resistance | More than 156 kΩ |
COMPONENT OPERATING RANGE
| ATF temperature sensor (TFT sensor) resistance | Resistance: 79 Ω to 156 kΩ |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (COROLLA_ZRE142 RM000000W770S5X.html).
- 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 value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
| READ DATA LIST |
Warm up the engine.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn on the Techstream.
Select the item "Powertrain / Engine and ECT / Data List".
According to the display on the Techstream, read the "Data List".
Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/T Oil Temperature 1 ATF Temp. Sensor Value/
min.: -40°C (-40°F)
max.: 215°C (419°F)- After Stall Test:
Approx. 80°C (176°F) - Equal to ambient temperature when cold soak
If the value is "-40°C (-40°F)" or "215°C (419°F)", ATF temp. sensor circuit is open or shorted. - HINT:
- When DTC P0712 is output and Techstream output is 150°C (302°F), there is a short circuit.
- When DTC P0713 is output and Techstream output is -40°C (-40°F), there is an open circuit.
- Measure the resistance between terminal THO1 (THO) and 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 temperature sensor become open, P0713 is immediately set (in 0.5 second).
- When P0713 is set, P0711 cannot be detected.
- It is not necessary to inspect the circuit when P0711 is set.
- After Stall Test:
| 1.INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) |
Disconnect the transmission wire connector from the transaxle.
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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 ↑
- HINT:
- If the resistance is out of the specified range with either the ATF temperature shown in the table below, the driveability of the vehicle may decrease.
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.
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Disconnect the ECM connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition B31-70 (THO1) - B31-71 (ETHO) Always 79 Ω to 156 kΩ
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Check for short):
Tester Connection Condition Specified Condition B31-70 (THO1) - Body ground Always 10 kΩ or higher B31-71 (ETHO) - Body ground Always ↑
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| OK | ||
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