Detection Condition

DTC P1780 indicates TCS was not cycled during KOER self-test. Transaxle Control Switch (TCS) is a momentary contact switch that allows driver to cancel overdrive gear. When TCS is pressed, a signal is sent to the PCM which then uses shift solenoids to disengage/disable overdrive gear operation. At the same time, Transaxle Control Indicator Light (TCIL) is illuminated to notify driver that overdrive gear is canceled. When TCS is pressed again, overdrive gear operation is enabled and TCIL is turned off. Whenever ignition is cycled off and then on, the TCS is turned off and overdrive gear is enabled, even if the TCS had been on when ignition was shut off.