DTC P2742: Transmission Fluid Temperature Sensor "B" Circuit Low Input; DTC P2743: Transmission Fluid Temperature Sensor "B" Circuit High Input [08/2019 - ]: Procedure

1. Disconnect the B32 transmission wire connector.

   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	25 Ω to 156 kΩ
   1 (OT2-) - Body ground	Always	10 kΩ or higher
   9 (OT2+) - Body ground	Always	10 kΩ or higher

   HINT: 

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

   Resistance (Reference)

   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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Transmission Wire)

Result: 

NG 

REPAIR OR REPLACE NO. 2 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE). Refer to  REMOVAL [08/2015 - ] 

Result: 

OK 

See step  2

1. Disconnect the B36 and B38 ECM connectors.

   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
   B38-14 (THO2) - B36-2 (ETH2)	Always	25 Ω to 156 kΩ
   B38-14 (THO2) - Body ground	Always	10 kΩ or higher
   B36-2 (ETH2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to ECM)

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [08/2015 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR