P0712 Transmission Fluid Temperature Sensor “A” Circuit Low Input P0713 Transmission Fluid Temperature Sensor “A” Circuit High Input
Description:
The No. 1 ATF temprature sensor converts the fluid temperature into a resistance value for use by the TCM.
The sensor resistance changes with the ATF temperature. As the temperature become 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 temprature become higher.
The TCM caculates the fluid temprature base on the voltage signal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0712 | Transmission Fluid Temperature Sensor “A” Circuit Low Input | No. 1 ATF temperature sensor resistance is below 79 Ω for 0.5 seconds or more (1-trip detection logic). | ·Short in No. 1 ATF temperature sensor circuit·No. 1 ATF temperature sensor (transmission wire)·TCM | Comes on | DTC stored |
| P0713 | Transmission Fluid Temperature Sensor “A” Circuit High Input | No. 1 ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more and either condition is met (1-trip detection logic): (A) 15 minutes or more have elapsed after the engine start when the 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 the engine coolant temperature and intake air temperature are higher than -29.375°C (-20.875°F). | ·Open in No. 1 ATF temperature sensor circuit·No. 1 ATF temperature sensor (transmission wire)·TCM | Comes on | DTC stored |
Wiring diagram:
Data list:
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| A/T Oil Temperature 1 | No. 1 ATF temperature sensor value | Min.: -40°C (-40°F) Max.: 150°C (302°F) | ·After stall test: Approx. 80°C (176°F)·Equal to ambient temperature after cold soak | If the value is “-40°C (-40°F)” or “150°C (302°F)”, the No. 1 ATF temperature sensor circuit is open or shorted. |
Procedure:.
1. Inspect No. 1 ATF temperature sensor (transmission wire)
Measure the resistance according to the value(s) in the table below.Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2 (OT-) – 10 (OT+) | Always | 79 Ω to 156 kΩ |
| 2 (OT-) – Body ground | Always | 10 kΩ or higher |
| 10 (OT+) – Body ground | Always | 10 kΩ or higher |
Resistance (Reference):
| 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 |
2. Check harness and connector (transmission wire – TCM)
Measure the resistance according to the value(s) in the table below.Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C77-25 (THO1) – C77-23 (E2) | Always | 79 Ω to 156 kΩ |
| C77-25 (THO1) – Body ground | Always | 10 kΩ or higher |
| C77-23 (E2) – Body ground | Always | 10 kΩ or higher |
