P0778

DTC P0778 - PRESSURE CONTROL SOLENOID " B " ELECTRICAL

OUTLINE OF DIAGNOSIS
Judge NG when the 2-4 brake duty solenoid becomes battery short, ground short or open circuit.

COMPONENT DESCRIPTION
2-4 brake duty solenoid is installed to the transmission hydraulic control valve body. The duty ratio is controlled by the signal from TCM. This solenoid decreases the change gear shock by adjusting the 2-4 brake pressure during 2-4 brake operation.




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.




DIAGNOSTIC METHOD

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When " Clear Memory " was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When " Clear Memory " was performed

FAIL SAFE
Control the shift to be fixed in 3rd gear.

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)