Check 5, Cruise Control Vacuum Pump

Hold Mode When the Set switch is On and the Cruise switch is On, when a determined speed is reached the control unit receives a set signal and turns the cruise vacuum pump motor On. After constant speed is reached the motor, control valve and release valve are repeatedly turned On and Off according to driving conditions.

Acceleration Mode When the Resume switch is pressed, the control unit receives a Resume signal and turns On the cruise vacuum pump motor, control valve and release valve.

Deceleration Mode When the Set switch in held depressed, the control unit receives a set signal and turns the cruise vacuum pump and control valve Off and turns the release valve On.

Release Mode When the Set switch is turned Off, the control unit receives a cancel signal and turns Off the cruise vacuum pump motor, control valve and release valve.

Measure voltage at terminal No. 26 then at terminal No. 13, vacuum pump drive and control valve open/close. Voltage should measure 12 volts or 0 volts during the Hold mode, 0 volts during the Acceleration mode and 12 volts during both the Deceleration and Release modes.

Measure voltage at terminal No. 12 release valve open/close. Voltage should measure 12 volts or 0 volts during the Hold mode, 0 volts during both the Acceleration and Deceleration modes and 12 volts during the Release mode.