Chart No. 8, Overdrive Cancelation Function Wiring Circuit A/T

If the Resume switch is used, or vehicle speed drops 1 mph below the vehicle set speed, overdrive and the signals to the control unit are cancelled. The vehicle will operate in third gear.
Measure A/T control unit voltage, terminal No. 10. With the overdrive switch in the On position, voltage should measure 12 volts.
Measure overdrive switch voltage, terminal No. 11. With the overdrive switch in the ON position, voltage should measure 12 volts.