System Description

The ECM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

DTC No.	DTC Detection Condition	Trouble Area
P0776	The engine revs freely when 4th, 5th, or 6th gear is commanded (2-trip detection logic). When any of the following is detected twice (2-trip detection logic): When 1st gear is commanded, 4th gear is engaged. When 2nd gear is commanded, 4th gear is engaged. When 3rd gear is commanded, 4th gear is engaged.	Shift solenoid valve SL2 remains open or closed Valve body is blocked Automatic transaxle (clutch, brake or gear etc.)