DTC P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2): Wiring Diagram

Fig 1: Wiring Diagram - Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve Sl2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• The shift solenoid valve SL2 is turned on/off normally when the shift lever is in the D position:
  SHIFT LEVER POSITION
  
  

  ECM command gearshift	1st	2nd	3rd	4th	5th	6th
  Shift solenoid valve SL2	ON	ON	ON	ON	OFF	OFF

1. INSPECT TRANSMISSION WIRE (SL2) 
   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
      
      

      Tester Connection	Specified Condition 20°C (68°F)
      10 (SL2+) - 2 (SL2-)	5.0 to 5.6 Ω

   3. Measure the resistance according to the value(s) in the table below.
      Fig 2: Inspecting Transmission Wire (Sl2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      10 (SL2+) - Body ground	10 kΩ or higher
      2 (SL2-) - 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.
      Fig 3: Disconnecting E4 Connector From ECM

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition 20°C (68°F)
      E4-11 (SL2+) - E4-10 (SL2-)	5.0 to 5.6 Ω

   4. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      E4-11 (SL2+) - Body ground	10 kΩ or higher
      E4-10 (SL2-) - Body ground

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM 

3. INSPECT SHIFT SOLENOID SL2 
   1. Remove the shift solenoid valve SL2.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

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

   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 SL2 

   Fig 4: Inspecting Shift Solenoid Sl2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPAIR OR REPLACE TRANSMISSION WIRE