P2742
DTC P2742 TRANSMISSION FLUID TEMPERATURE SENSOR "B" CIRCUIT LOW INPUTCIRCUIT DESCRIPTION
DTC Detection Conditions:
The Automatic Transmission Fluid (ATF) temperature sensor No.2 is on the transmission, just before the oil cooler inlet pipeline.
If the ECM detects an abnormally high ATF temperature through this sensor, it illuminates the warning lamp to indicate the problem to the driver.
The symptoms and recovery conditions, when the sensor is normal or there is a short malfunction in the sensor, are as shown in the table.
HINT:
- The ATF temperature is liable to increase under vehicle conditions such as towing, climbing hills and in traffic.
- If there is a short malfunction in the ATF temperature sensor No.2, the ECM receives signals from the sensor, which indicate that the ATF temperature is 150°C (302°F) or more.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Condition:
Typical Malfunction Thresholds:
Component Operating Range:
These DTCs indicate an open or short in the Automatic Transmission Fluid (ATF) temperature sensor No.2 circuit. The ATF temperature sensor No.2 converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and detects any open or short malfunctions in the ATF temperature sensor No.2 circuit. If the resistance (voltage) of the ATF temperature sensor No.2 is less than 25 ohm (0.046 V) or more than 156 kOhms (4.915 V), the ECM interprets this as a fault in the ATF temperature sensor No.2 or its wiring. The ECM turns on the MIL and stores a DTC.
Wiring Diagram:
Step 1 - 2:
INSPECTION PROCEDURE
HINT: According to the DATA LIST displayed on the hand-held tester, you can read the values of components, such as the switches, sensors, actuators, without removing any parts. Reading the DATA LIST as a first step of troubleshooting is one method of shortening labor time.
NOTE: In the table, the values listed under "Normal Condition" are for reference only. Do not depend solely on these reference values when judging whether a part is faulty or not.
a. Warm up the engine.
b. Turn the ignition switch off.
c. Connect the hand-held tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.
d. Turn the ignition switch to the ON position.
e. Push the "ON" button of the tester.
f. Select the items "DIAGNOSIS/ ENHANCED OBD II/ DATA LIST"/ A/T.
g. According to the display on the tester, read the "DATA LIST".
HINT:
When DTC P2742 is output and hand-held tester reading is 150°C (302°F) or more, there is a short circuit.
When DTC P2743 is output and hand-held tester reading is -40°C (-40°F), there is an open circuit.
Measure the resistance between terminal THO2 (OT2) and the body ground.