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

1. Disconnect the ECM connector.
   Fig 1: Checking Harness And Connector (Shift Solenoid Valve SL2 Circuit)

   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
   E26-13 (SL2+) - E26-12 (SL2-)	20°C (68°F)	5.0 to 5.6 Ω
   E26-13 (SL2+) - Body ground and other terminals	Always	10 kΩ or higher
   E26-12 (SL2-) - Body ground and other terminals	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

   Result

   Result	Proceed to
   OK	A
   NG	B

B → See step   2 

A → See step   6 

1. Disconnect the harness connector from the wiring harness connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E26-13 (SL2+) - E8-9 (SL2+)	Always	Below 1 Ω
   E26-12 (SL2-) - E8-8 (SL2-)	Always	Below 1 Ω
   E26-13 (SL2+) or E8-9 (SL2+) - Body ground and other terminals	Always	10 kΩ or higher
   E26-12 (SL2-) or E8-8 (SL2-) - Body ground and other terminals	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the wiring harness connector from the transaxle.
   Fig 2: Checking Transmission Wire (SL2)

   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
   A-9 (SL2+) - A-8 (SL2-)	20°C (68°F)	5.0 to 5.6 Ω
   A-9 (SL2+) - Body ground and other terminals	Always	10 kΩ or higher
   A-8 (SL2-) - Body ground and other terminals	Always	10 kΩ or higher

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   *a	Component without harness connected (Transmission Wire)

NG → See step   4 

OK → See step   8 

1. Remove shift solenoid valve SL2.
   Fig 3: Inspecting Shift Solenoid Valve SL2

   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 a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.

   OK

   Valve moves and makes an operating sound.

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   *1	Shift Solenoid Valve SL2

NG → See step   7 

OK → See step   5