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. 2 ATF TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
DTC P2740 Transmission Fluid Temperature Sensor "B" Circuit |
DTC P2742 Transmission Fluid Temperature Sensor "B" Circuit Low Input |
DTC P2743 Transmission Fluid Temperature Sensor "B" Circuit High Input |
DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline.If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning light.
- HINT:
- The temperature of the ATF easily rises when towing, climbing hills, in traffic, etc.
- If the ATF temperature sensor becomes short-circuited, the signal that indicates that the ATF temperature is 150°C (302°F) or higher is input into the ECM.
| No. 2 ATF Temperature Sensor State | Detection Condition | Symptom | Recovery Condition |
| Sensor is normal | ATF temperature higher than 150°C (302°F) | ATF temperature warning light remains ON | ATF temperature below 135°C (275°F)*1 |
| ATF temperature higher than 130°C (266°F) | Shift point too high | ATF temperature below 110°C (230°F) | |
| Conditions (a) and (b) are met: (a) ATF temperature higher than 130°C (266°F) (b) Engine coolant temperature higher than 95°C (203°F) | Lock-up in 3rd gear*2 | ATF temperature below 110°C (230°F)*1 and engine coolant temperature higher than 95°C (203°F) | |
| Sensor is short-circuited | Any conditions |
| Symptoms still occur |
| Engine coolant temperature higher than 95°C (203°F) | Lock-up in 3rd gear*2 | Symptoms still occur |
- HINT:
- *1: When ATF temperature is in the normal range, it decreases to below 135°C (275°F) within 5 minutes with the shift lever in P or N in an idling state.
- *2: When ATF temperature is normal, transmission lock-up occurs in 5th gear with the shift lever in D, and in 4th gear with the shift lever in 4.
| DTC Code | DTC Detection Condition | Trouble Area |
| P2740 | (a) and (b) are detected momentarily within 0.5 seconds when neither P2742 nor P2743 are detected (1-trip detection logic). (a) No. 2 ATF temperature sensor resistance is less than 25 Ω (0.046 V). (b) No. 2 ATF temperature sensor resistance is more than 156 kΩ (4.915 V).
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| P2742 | No. 2 ATF temperature sensor resistance is below 25 Ω (0.046 V) for 0.5 sec. or more (1-trip detection logic). |
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| P2743 | When 15 minutes or more have elapsed after engine is started, No. 2 ATF temperature sensor resistance is more than 156 kΩ (4.915 V) 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 the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature sensor is below 25 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and stores 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
Refer to DTC P0710 (HILUX_TGN26 RM000000W850NVX_07.html).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 2 No. 2 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. 2 ATF temperature sensor circuit is open or shorted. - HINT:
- When DTC P2742 is output and the intelligent tester output is 150°C (302°F) or higher, there is a short circuit.
- When DTC P2743 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. 2 ATF TEMPERATURE SENSOR) |
Disconnect the transmission wire connector.
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Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 (OT2-) - 9 (OT2+) Always 25 Ω to 156 kΩ 1 (OT2-) - Body ground Always 10 kΩ or higher 9 (OT2+) - 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) |
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Disconnect the ECM connectors.
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Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C130-32 (THO2) - C129-28 (E2) Always 25 Ω to 156 kΩ C130-32 (THO2) - 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)
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| OK | ||
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