Drivetrain. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
A343E Automatic Transmission Transaxle. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
INSPECT ATF TEMPERATURE SENSOR
CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR - 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 Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline.
- HINT:
- The temperature of the ATF easily rises when towing, climbing hills, in traffic, etc.
| ATF Temperature Sensor State | Detection Condition | Symptom | Recovery Condition |
| Sensor is normal | ATF temperature higher than 130°C (266°F) | Shift point too low | ATF temperature below 125°C (257°F) |
| When conditions (a) and (b) are satisfied: (a) ATF temperature higher than 130°C (266°F) (b) Engine coolant temperature higher than 98°C (208°F) | Lock-up in 4th or 3rd gear* | ATF temperature below 110°C (230°F) and engine coolant temperature below 98°C (208°F) | |
| Sensor is short-circuited | Any conditions | Shift point too low | Symptoms still occur |
| Engine coolant temperature higher than 95°C (203°F) | Lock-up in 4th or 3rd gear* | Symptoms still occur |
- HINT:
- *: When the ATF temperature is normal, transmission lock-up occurs in 4th gear with the shift lever in D and in 3rd gear with the shift lever in 3.
| DTC Code | DTC Detection Condition | Trouble Area |
| P0710 | ATF temperature sensor resistance changes from (a) to (b) or from (b) to (a) in less than 0.5 sec., and P0712 and P0713 are not detected (1-trip detection logic): (a) ATF temperature sensor resistance is less than 79 Ω (b) ATF temperature sensor resistance is more than 156 kΩ |
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| P0712 | ATF temperature sensor resistance is below 79 Ω for 0.5 sec. or more (1-trip detection logic). |
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| P0713 | When 15 minutes or more have elapsed after the engine is started, ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more (1-trip detection logic). |
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MONITOR DESCRIPTION
The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature sensor is below 79 Ω or higher than 156 kΩ, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and store the DTC.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 3 ATF temperature sensor value/
Min.: -40°C (-40°F)
Max.: 215°C (419°F)- After stall test: Approximately 80°C (176°F)
- Equal to ambient temperature when engine cold
If the value is -40°C (-40°F) or 215°C (419°F), the 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 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 ATF TEMPERATURE SENSOR |
Disconnect the ATF temperature sensor connector.
 |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 - 2 Always 79 Ω to 156 kΩ 1 - Body ground Always 10 kΩ or higher 2 - Body ground Always 10 kΩ or higher
- HINT:
- If the resistance is out of the specified range at either of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
- Standard Resistance:
ATF Temperature Specified Condition 20°C (68°F) 10.3 to 13.9 kΩ 120°C (248°F) 0.58 to 0.65 kΩ
| *a | Component without harness connected (ATF Temperature Sensor) |
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR - ECM) |
Disconnect the ECM connector.
 |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C75-22 (THOC) - C75-28 (E2) Always 79 Ω to 156 kΩ C75-22 (THOC) - Body ground Always 10 kΩ or higher C75-28 (E2) - Body ground Always 10 kΩ or higher
Text in Illustration *a Rear view of wire harness connector
(to ECM)
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| OK | ||
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