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 power management control ECU turns the solenoid valves (SL1, SL2, and SP) 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 solenoid valve (SL1) circuit

  • Wire harness or connector

  • Hybrid vehicle transmission assembly

  • Power management control ECU
P0778 851 Short or open in the solenoid valve (SL2) circuit

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0731-871 Click here.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. B002B9CE01
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.

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

    NG

    CONNECT SECURELY

    OK

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


    1. A000RZYE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N91-14 (SL1+) - N91-13 (SL1-) 68°F (20°C) 5.0 to 5.6 Ω
      N91-12 (SL2+) - N91-11 (SL2-) 68°F (20°C) 5.0 to 5.6 Ω

    3. Connect the power management control ECU connector.


    NG

    CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR) Click here

    OK

  3. CHECK FOR INTERMITTENT PROBLEMS

    Click here


    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

  4. CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR)


    1. A000SJ3

      Check the connection of the transmission wire connector Click here.

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

    NG

    CONNECT SECURELY

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - TRANSMISSION WIRE)


    1. A000O1WE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *b

      Front view of wire harness connector

      (to Transmission Wire)

      Disconnect the transmission wire connector.

    2. Disconnect the connector from the power management control ECU.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A36-6 (PB1) - Body ground Power switch on (IG) Below 1 V

      Note

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

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A36-6 (PB1) - F52-11 (PB1) Power switch off Below 1 Ω
      A36-6 (PB1) or F52-11 (PB1) - Body ground and other terminals Power switch off 10 kΩ or higher

    7. Connect the transmission wire connector.

    8. Connect the power management control ECU connector.


    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR