DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) [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
   11 (SL1+) - 3 (SL1-)	20°C (68°F)	5.0 to 5.6 Ω
   11 (SL1+) - Body ground	Always	10 kΩ or higher
   3 (SL1-) - Body ground	Always	10 kΩ or higher

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
   D56-14 (SL1+) - D56-15 (SL1-)	20°C (68°F)	5.0 to 5.6 Ω
   D56-14 (SL1+) - Body ground	Always	10 kΩ or higher
   D56-15 (SL1-) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM 

Refer to:REMOVAL [08/2015 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the shift solenoid valve SL1.

   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 - 2	20°C (68°F)	5.0 to 5.6 Ω

3. Connect the battery positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the solenoid valve connector. 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 SL1 

Refer to:PROCEDURE - Step 4 )