DTC P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1): Wiring Diagram

Fig 1: Wiring Diagram - Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve Sl1)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• The shift solenoid valve SL1 is turned on/off normally when the shift lever is in the D position:

1. INSPECT TRANSMISSION WIRE (SL1) 
   1. Disconnect the transmission wire connector from the transmission.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition 20°C (68°F)
      11 (SL1+) - 3 (SL1-)	5.0 to 5.6 Ω

      Fig 2: Inspecting Transmission Wire (SL1)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for short) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   11 (SL1+) - Body ground	10 kΩ or higher
   3 (SL1-) - Body ground

   NG : Go to step  3

   OK : Go to next Step 

2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
   1. Connect the transmission connector to the transmission.
   2. Disconnect the connector from the ECM.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition 20°C (68°F)
      E4-25 (SL1+) - E4-24 (SL1-)	5.0 to 5.6 Ω

      Fig 3: Disconnecting E4 Connector From ECM

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for short) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   E4-25 (SL1+) - Body ground	10 kΩ or higher
   E4-24 (SL1-) - Body ground

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM 

3. INSPECT SHIFT SOLENOID VALVE SL1 
   1. Remove the shift solenoid valve SL1.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition 20°C (68°F)
      1 - 2	5.0 to 5.6 Ω

      Fig 4: Checking Continuity Between Solenoid Valve Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.

   OK: 

   The solenoid makes an operating sound. 

   NG : REPLACE SHIFT SOLENOID VALVE SL1 

   OK : REPAIR OR REPLACE TRANSMISSION WIRE