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


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE 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

Changing from 1st to 6th is performed by the ECM turning shift solenoid valves SL1, SL2, SL3 and SL4 on and off. 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 (LandCruiser RM000000O8L0SWX.html).

DTC No.
DTC Detection Condition
Trouble Area
P0778
An open or short circuit (output signal duty is 0% or 100%) is detected by the ECM in the shift solenoid valve SL2 circuit while driving and shifting gears (SL2 output signal duty is more than 0% and less than 100% under normal conditions) (1 trip detection logic).
  1. Open or short in shift solenoid valve SL2 circuit
  2. Shift solenoid valve SL2
  3. 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 or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the ECM detects the problem and illuminates the MIL and stores the DTC. The ECM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the ECM stops sending current to the circuit.)
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction (LandCruiser RM000000O8L0SWX.html).

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Ac60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Gr-Fe). Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)


INSPECTION PROCEDURE

NOTICE:
Perform registration and/or initialization when parts related to the automatic transmission are replaced (LandCruiser RM000000O7H0HRX.html).
HINT:
  1. The following table shows normal operation of the shift solenoid valve SL2 when the shift lever is in D:

    ECM commanded gear
    		1st
    		2nd
    		3rd
    		4th
    		5th
    		6th
    Shift solenoid valve SL2
    		OFF
    		OFF
    		OFF
    		ON
    		ON
    		ON
  2. After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
    1. Perform the D Position Shift Test in Road Test.
    2. Check for DTCs again (LandCruiser RM000000W7711JX.html).
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Ac60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Gr-Fe). Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Disconnect the transmission wire connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    15 (SL2+) - 16 (SL2-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    15 (SL2+) - Body ground
    		Always
    		10 kΩ or higher
    16 (SL2-) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (Transmission Wire)


NG
Go to step 3
OK


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Ac60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Gr-Fe). Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C35-31 (SL2+) - C35-32 (SL2-)
    		20°C (68°F)
    		5.0 to 5.6 Ω
    C35-31 (SL2+) - Body ground
    		Always
    		10 kΩ or higher
    C35-32 (SL2-) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM00000329203TX.html)

3.INSPECT SHIFT SOLENOID VALVE SL2


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Ac60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Gr-Fe). Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2)

  1. Remove shift solenoid valve SL2 (LandCruiser RM000000O9L07IX.html).

  1. 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

  1. 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
    1. Battery positive (+) with a 21 W bulb → Terminal 1
    2. Battery negative (-) → Terminal 2
    		Valve moves and makes an operating noise
Text in Illustration
*1
Shift Solenoid Valve SL2


NG
REPLACE SHIFT SOLENOID VALVE SL2 (LandCruiser RM000000O9L07IX.html)
OK

REPLACE TRANSMISSION WIRE (LandCruiser RM000000ODV01OX.html)