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 D41 No. 1 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
   2 (OT2-) - 10 (OT2+)	Always	25 Ω to 156 kΩ
   2 (OT2-) - Body ground	Always	10 kΩ or higher
   10 (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.

   Standard Resistance

   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

Result: 

NG 

REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (NO. 2 ATF TEMPERATURE SENSOR) 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  2

1. Disconnect the D56 ECM 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
   D56-79 (THO2) - D56-74 (EAIP)	Always	25 Ω to 156 kΩ
   D56-79 (THO2) - Body ground	Always	10 kΩ or higher
   D56-74 (EAIP) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR