DTC P0748-850: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1); DTC P0778-851: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2): Procedure

1. Check the connections of the hybrid vehicle control ECU connectors.

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
2. Disconnect connector E55 from the hybrid vehicle control ECU.
   Fig 1: Identifying Connector E55 From Hybrid Vehicle Control ECU

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E55-3 (SL1+) - E55-2 (SL1-)	Approximately 14°F (-10°C)	4.68 Ω (Reference)
   	Approximately 68°F (20°C)	5.0 to 5.6 Ω
   	Approximately 176°F (80°C)	6.54 Ω (Reference)
   	Approximately 248°F (120°C)	7.36 Ω (Reference)
   E55-11 (SL2+) - E55-10 (SL2-)	Approximately 14°F (-10°C)	4.68 Ω (Reference)
   	Approximately 68°F (20°C)	5.0 to 5.6 Ω
   	Approximately 176°F (80°C)	6.54 Ω (Reference)
   	Approximately 248°F (120°C)	7.36 Ω (Reference)

NG → See step   4 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK → See step   6 

1. Check the connection of the transmission wire connector.

   OK

   The connector is connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect the transmission wire connector.
   Fig 2: Checking Harness And Connector (Transmission Wire -- Hybrid Vehicle Control)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   E55-2 (SL1-) - Body ground	Power switch on (IG)	Below 1 V
   E55-3 (SL1+) - Body ground	Power switch on (IG)	Below 1 V
   E55-10 (SL2-) - Body ground	Power switch on (IG)	Below 1 V
   E55-11 (SL2+) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Turn the power switch off.
5. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   E55-2 (SL1-) - E61-13 (SL1-)	Power switch off	Below 1 Ω
   E55-3 (SL1+) - E61-6 (SL1+)	Power switch off	Below 1 Ω
   E55-10 (SL2-) - E61-12 (SL2-)	Power switch off	Below 1 Ω
   E55-11 (SL2+) - E61-5 (SL2+)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   E55-2 (SL1-) or E61-13 (SL1-) - Body ground and other terminals	Power switch off	10 kΩ or higher
   E55-3 (SL1+) or E61-6 (SL1+) - Body ground and other terminals	Power switch off	10 kΩ or higher
   E55-10 (SL2-) or E61-12 (SL2-) - Body ground and other terminals	Power switch off	10 kΩ or higher
   E55-11 (SL2+) or E61-5 (SL2+) - Body ground and other terminals	Power switch off	10 kΩ or higher

   HINT: 

   The SL1 and SL2 solenoid valves are not available separately. If either of them requires replacement, replace the hybrid vehicle transmission assembly.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7