P2743

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 No. 2 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:
^ ATF temperature rises quickly when towing, climbing hills, in traffic, etc.
^ If the No. 2 ATF temperature sensor becomes short-circuited, the signal that indicates that the ATF temperature is 150°C (302°F) or higher is input in the ECM.

Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table.





HINT:
*1: When ATF temperature is normal, transmission lock-up occurs in 5th gear with the shift lever on D, and 4th gear with the shift lever on 4.
*2: When ATF temperature is in the normal range, it decreases to less than 135°C (275°F) within 5 minutes with the shift lever on P or N in an idling state.

P2740/P2742:

P2743:

MONITOR DESCRIPTION
ATF temperature sensor converts ATF temperature to 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 is less than 25 Ohms*1 or more than 156 kOhms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and store the DTC.

HINT:
^ *1: 150°C (302°F) or more 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.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE

WIRING DIAGRAM:

INSPECTION PROCEDURE

HINT: Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.

NOTICE: In the table, 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.

1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
4. Turn the ignition switch ON.
5. Turn the intelligent tester ON.
6. Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.
7. Follow the instructions on the tester and read the DATA LIST.





HINT:
^ When DTC P2742 is output and the intelligent tester output is 150°C (302°F) or more, 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. Measure the resistance between terminal THO2 (OT2) and the body ground.

Step 1:

Step 2: