DTC P0973: Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1); DTC P0974: Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1) [08/2019 - ]: 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
   8 (S1) - Body ground	20°C (68°F)	11 to 15 Ω

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   *a	Component without harness connected (Transmission Wire)

Result: 

NG 

See step  3

Result: 

OK 

See step  2

1. Disconnect the B38 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
   B38-25 (S1) - Body ground	20°C (68°F)	11 to 15 Ω

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   *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 

1. Remove 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. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

   OK

   Measurement Condition	Specified Condition
   Battery positive (+) → Shift solenoid valve S1 connector Battery negative (-) → Shift solenoid valve S1 body	Valve moves and makes operating noise

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Shift Solenoid Valve S1)

Result: 

OK 

REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [08/2015 - ] 

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE S1. Refer to  PROCEDURE - Step 6