DTC P2742: Transmission Fluid Temperature Sensor "B" Circuit Low Input; DTC P2743: Transmission Fluid Temperature Sensor "B" Circuit High Input: Procedure

1. Disconnect the transmission wire connector from the transmission.
   Fig 1: Inspecting Transmission Wire (No. 2 ATF Temperature Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (OT2-) - 9 (OT2+)	Always	79 Ω to 156 kΩ
   1 (OT2-) - Body ground	Always	10 kΩ or higher
   9 (OT2+) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected: (Transmission Wire)

   HINT: 

   If the resistance is outside the specified range at either of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.

   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

NG → See step   4 

OK: Go to next step 

1. Connect the transmission wire connector to the transmission.
   Fig 2: Identifying B48/B49 Harness Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the ECM connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B49-11 (THO2) - B48-8 (ETHW)	Always	79 Ω to 156 kΩ
   B49-11 (THO2) - Body ground	Always	10 kΩ or higher
   B48-8 (ETHW) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector: (to ECM)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3