DTC P0973: Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1); DTC P0974: Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1) [08/2015 - 08/2017]: 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
   8 (S1) - Body ground	20°C (68°F)	11 to 15 Ω

Result: 

NG 

See step  3

Result: 

OK 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D56 ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D56-7 (S1) - Body ground	20°C (68°F)	11 to 15 Ω

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the shift solenoid valve S1.

   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
   Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body	20°C (68°F)	11 to 15 Ω

3. Connect the battery positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid valve body. Then check that the valve moves and makes an operating noise.

   OK

   Valve moves and makes an operating noise.

Result: 

OK 

REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE S1 

(Refer to PROCEDURE - Step 6 )