Drivetrain. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
A750F Automatic Transmission Transaxle. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
INSPECT TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
DTC P0710 Transmission Fluid Temperature Sensor "A" Circuit |
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 ATF temperature into a resistance value which is input into the ECM.The ECM applies a voltage to the temperature sensor through ECM terminal THO1.
The sensor resistance changes with the ATF temperature.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.
The ECM calculates the ATF temperature based on the voltage signal.
| DTC Code | DTC Detection Condition | Trouble Area |
| P0710 | (a) and (b) are detected momentarily within 0.5 sec. when neither P0712 nor P0713 is detected (1-trip detection logic). (a) No. 1 ATF temperature sensor resistance is less than 79 Ω. (b) No. 1 ATF temperature sensor resistance is more than 156 kΩ.
|
|
| P0712 | No. 1 ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1-trip detection logic). |
|
| P0713 | When 15 min. or more have elapsed after engine is started, No. 1 ATF temperature sensor resistance is more than 156 kΩ for 0.5 sec. or more (1-trip detection logic). |
|
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 an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.- HINT:
- *1: 150°C (302°F) or higher is indicated regardless of the actual ATF temperature.
- *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
- The ATF temperature can be checked on the intelligent tester display.
WIRING DIAGRAM
INSPECTION PROCEDURE
| DATA LIST |
- HINT:
- Using the intelligent tester 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 intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List.
According to the display on the tester, read the Data List.
Engine and ECT 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.: 215°C (419°F)- After stall test: Approximately 80°C (176°F)
- With engine cold: Equal to ambient temperature
If the value is -40°C (-40°F) or 215°C (419°F), the No. 1 ATF temperature sensor circuit is open or shorted. - HINT:
- When DTC P0712 is output and the intelligent tester output is 150°C (302°F) or higher, there is a short circuit.
- When DTC P0713 is output and the intelligent tester output is -40°C (-40°F), there is an open circuit.
- Check the temperature displayed on the intelligent tester in order to check if a malfunction exists.
Temperature Displayed Malfunction -40°C (-40°F) Open circuit 150°C (302°F) or higher Short circuit - After stall test: Approximately 80°C (176°F)
| 1.INSPECT TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR) |
Disconnect the transmission wire connector.
 |
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
- HINT:
- If the resistance is out of the specified range at one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
- 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
| *a | Component without harness connected (Transmission Wire) |
|
| ||||
| OK | |
| 2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Disconnect the ECM connectors.
 |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C130-24 (THO1) - C129-28 (E2) Always 79 Ω to 156 kΩ C130-24 (THO1) - Body ground Always 10 kΩ or higher C129-28 (E2) - Body ground Always 10 kΩ or higher
Text in Illustration *a Rear view of wire harness connector
(to ECM)
|
| ||||
| OK | ||
| ||