Theory Of Operation

The odd clutch normally functions at positions in between fully engaged (clutch closed) and fully disengaged (clutch open). This diagnostic checks if the odd clutch is stuck in a position closer to the clutch closed position than the requested position. This is caused either by a mechanical failure of the clutch or by a blocked odd clutch solenoid valve which keeps fluid pressure too low and the clutch closed. When the solenoid valve current is high, the valve opens and the fluid pressure disengages the odd clutch.