СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ (для моделей с 1AZ-FE), Diagnostic DTC:P0778

DTC Code DTC Name
P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)

DESCRIPTION

Shifting from 1st to 4th is performed in combination with the ON and OFF operation of shift solenoid valves SL1, SL2 and S4, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely Click here.

DTC Code DTC Detection Condition Trouble Area
P0778 The duty cycle to shift solenoid valve SL2 is 100% (1 trip detection logic).

  • Open or short in shift solenoid valve SL2 circuit

  • Shift solenoid valve SL2

  • ECM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit Click here.

WIRING DIAGRAM

A005R8KE68

INSPECTION PROCEDURE

PROCEDURE

  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)

    1. Disconnect the B19 transmission wire connector.

      A005WDGE04

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 (SL2+) - 9 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      4 (SL2+) - Body ground Always 10 kΩ or higher
      9 (SL2-) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Wire)
    NG

    INSPECT SHIFT SOLENOID VALVE SL2 Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

    1. Disconnect the B39 ECM connector.

      A005S8YE19

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B39-58 (SL2+) - B39-59 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      B39-58 (SL2+) - Body ground Always 10 kΩ or higher
      B39-59 (SL2-) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  3. INSPECT SHIFT SOLENOID VALVE SL2

    1. Remove shift solenoid valve SL2.

      A005V5JE01

    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. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

      OK
      Measurement Condition Specified Condition

      • Battery positive (+) with a 21 W bulb → Terminal 1

      • Battery negative (-) → Terminal 2

      		 Valve moves and makes an operating noise
      Text in Illustration
      *1

      Component without harness connected

      (Shift Solenoid Valve SL2)
    NG

    REPLACE SHIFT SOLENOID VALVE SL2 Click here

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here