DTC P2742: Transmission Fluid Temperature Sensor "B" Circuit Low Input; DTC P2743: Transmission Fluid Temperature Sensor "B" Circuit High Input [08/2017 - 08/2019]: 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, the ATF temperature warning light illuminates or a message is displayed in the combination meter.
HINT:
- The temperature of 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.
Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table below.
| No. 2 ATF Temperature Sensor State | Detection Condition | Symptom | Recovery Condition |
|---|---|---|---|
| Sensor is normal | ATF temperature more than 150°C (302°F) | ATF temperature warning light is illuminated or message is displayed in combination meter | ATF temperature less than 135°C (275°F)*1 |
| ATF temperature more than 130°C (266°F) | Shift point too high | ATF temperature less than 110°C (230°F) | |
| When the conditions (a) and (b) are satisfied. (a) ATF temperature more than 130°C (266°F) (b) Engine coolant temperature more than 95°C (203°F) |
Lock-up at 3rd gear*2 | ATF temperature less than 110°C (230°F)*1 and engine coolant temperature more than 95°C (203°F) | |
| Sensor is short-circuited | Any conditions |
|
Symptoms still occur |
| Engine coolant temperature more than 95°C (203°F) | Lock-up at 3rd gear*2 | Symptoms still occur |
HINT:
*1: When ATF temperature is in the normal range, it decreases to less than 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 or 6th gear with the shift lever in the D position or S6 range, in 5th gear with the shift lever in the S5 range, and 4th gear with the shift lever in the S4 range.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P2742 | No. 2 ATF temperature sensor resistance is less than 25 Ω (0.046 V) for 0.5 seconds or more. (1-trip detection logic) |
|
| P2743 | No. 2 ATF temperature sensor resistance is higher than 156 kΩ (4.915 V) for 0.5 sec. or more and either condition is met (1-trip detection logic): (A) 15 min. 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 sec. 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). |
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