Applicable to Toyota LandCruiser 200 Series Diesel Vehicles
It is possible that during the installation of the Lockup wires into the Main ECU connector in the engine bay that the installer has mistakenly cut and/or soldered to the incorrect wires.
The P0778 code is associated with the SL2 solenoid which is located in the pins adjacent to the SLU pins.
The P0788 code is associated with the SL1 solenoid which is located in the pins adjacent to the SLU pins.
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