HYBRID CONTROL SYSTEM, Diagnostic DTC:P0748-850, P0778-851

DTC Code DTC Name
P0748-850 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)
P0778-851 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)

DESCRIPTION

The hybrid vehicle control ECU turns the SL1, SL2, and SP solenoid valves on and off to switch between low and high gear.

DTC No. INF Code DTC Detection Condition Trouble Area
P0748 850 Short or open in the SL1 solenoid valve circuit

  • Wire harness or connector

  • Hybrid vehicle transmission assembly

  • Hybrid vehicle control ECU
P0778 851 Short or open in the SL2 solenoid valve circuit

WIRING DIAGRAM

A000X7JE02
*a Hybrid Vehicle Transmission Assembly (Transmission Wire)
*b Hybrid Vehicle Control ECU

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. A000XH7E01
      *1 Hybrid Vehicle Control ECU

      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

  2. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (SL1 SOLENOID VALVE, SL2 SOLENOID VALVE)


    1. Turn the power switch off.

    2. A000VU4E02
      *1 Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)

      Disconnect connector E58 from the hybrid vehicle control ECU.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E58-3 (SL1+) - E58-2 (SL1-) Approximately -10°C (14°F)

      4.68 Ω

      (Reference)
      Approximately 20°C (68°F) 5.0 to 5.6 Ω
      Approximately 80°C (176°F)

      6.54 Ω

      (Reference)
      Approximately 120°C (248°F)

      7.36 Ω

      (Reference)
      E58-11 (SL2+) - E58-10 (SL2-) Approximately -10°C (14°F)

      4.68 Ω

      (Reference)
      Approximately 20°C (68°F) 5.0 to 5.6 Ω
      Approximately 80°C (176°F)

      6.54 Ω

      (Reference)
      Approximately 120°C (248°F)

      7.36 Ω

      (Reference)

    NG

    CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR) Click here

    OK

  3. CHECK FOR INTERMITTENT PROBLEMS


    1. Check for intermittent problems Click here.


    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

  4. CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR)


    1. A000TLIE01
      *1 Transmission Wire

      Check the connection of the transmission wire connector.

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

    NG

    CONNECT SECURELY

    OK

  5. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - HYBRID VEHICLE CONTROL ECU)


    1. A000XAEE03
      *1 Front view of wire harness connector: (to Transmission Wire)
      *2 Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)

      Disconnect the transmission wire connector.

    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
      E58-2 (SL1-) - Body ground Power switch on (IG) Below 1 V
      E58-3 (SL1+) - Body ground Power switch on (IG) Below 1 V
      E58-10 (SL2-) - Body ground Power switch on (IG) Below 1 V
      E58-11 (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
      E58-2 (SL1-) - E64-13 (SL1-) Power switch off Below 1 Ω
      E58-3 (SL1+) - E64-6 (SL1+) Power switch off Below 1 Ω
      E58-10 (SL2-) - E64-12 (SL2-) Power switch off Below 1 Ω
      E58-11 (SL2+) - E64-5 (SL2+) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      E58-2 (SL1-) or E64-13 (SL1-) - Body ground and other terminals Power switch off 10 kΩ or higher
      E58-3 (SL1+) or E64-6 (SL1+) - Body ground and other terminals Power switch off 10 kΩ or higher
      E58-10 (SL2-) or E64-12 (SL2-) - Body ground and other terminals Power switch off 10 kΩ or higher
      E58-11 (SL2+) or E64-5 (SL2+) - Body ground and other terminals Power switch off 10 kΩ or higher

      Tech Tips

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


    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR