Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

Transmission. Camry. Acv40 Gsv40
U250E Automatic Transaxle. Camry. Acv40 Gsv40

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT TRANSMISSION WIRE (SL2)

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

INSPECT SHIFT SOLENOID VALVE (SL2)

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


DESCRIPTION

Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Fail safe function).

DTC No.
DTC Detection Condition
Trouble Area
P0778
ECM checks for an open or short circuit in shift solenoid valves SL2 (1-trip detection logic)
Hybrid IC for solenoid indicates fail.
  1. Open or short in shift solenoid valve SL2 circuit
  2. Shift solenoid valve SL2
  3. ECM

MONITOR DESCRIPTION

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 and illuminates the MIL and stores the DTC. And 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.)
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WIRING DIAGRAM


Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)


INSPECTION PROCEDURE

1.INSPECT TRANSMISSION WIRE (SL2)


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Disconnect the transmission wire connector from the transaxle.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    5 (SL2+) - 12 (SL2-)
    		5.0 to 5.6 Ω

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

    Standard resistance (Check for short) :
    Tester Connection
    		Specified Condition
    5 (SL2+) - Body ground
    		10 kΩ or higher
    12 (SL2-) - Body ground
    		10 kΩ or higher


NG
Go to step 3
OK


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


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Connect the transmission connector to the transaxle.

  1. Disconnect the connector from the ECM.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    C24-58 (SL2+) - C24-59 (SL2-)
    		5.0 to 5.6 Ω

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

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    C24-58 (SL2+) - Body ground
    		10 kΩ or higher
    C24-59 (SL2-) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

3.INSPECT SHIFT SOLENOID VALVE (SL2)


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Remove the shift solenoid valve SL2.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    1 - 2
    		5.0 to 5.6 Ω

  1. Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.

    OK:
    The solenoid makes an operating sound.


NG
REPLACE SHIFT SOLENOID VALVE (SL2)
OK

REPAIR OR REPLACE TRANSMISSION WIRE