P2742
DTC P2742 Transmission Fluid Temperature Sensor "B" Circuit Low InputCIRCUIT DESCRIPTION
DTC Detecting Condition:
The ATF temperature sensor converts fluid temperature into a resistance value which is input in to the ECM. ATF temperature sensor No.2 is on the transmission and just before the oil cooler inlet pipeline. If ECM detects the abnormally high temperature of ATF by this sensor, it draws driver's attention by illuminating the warning lamp.
HINT:
- The temperature of ATF easily raises when towing, climbing hills and in traffic, etc.
- If the ATF temperature sensor No.2 shorts, the signal that indicates the ATF temperature is 150°C (302°F) or higher is input in ECM.
Vehicle conditions when sensor is in normal and when the vehicle is in short are indicated in the table.
HINT: *1: When AT fluid temperature is in normal range, it decreases to less than 135°C within 5 minutes with the shift lever in P or N position in a idling state.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
Component Operating Range:
The automatic transmission fluid (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 opens or shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ohm or more than 156 kOhm, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn on the MIL and store the DTC.
Wiring Diagram:
Step 1:
Step 2:
INSPECTION PROCEDURE