Engine Switches

Several switches provide operating information to the ECU. These include the Park/Neutral switch (automatic transmission only), air conditioning clutch, and Sync Pulse switch. When the A/C or Park/Neutral switches supply the ECU with an "on" signal, the module signals the ISS motor to change idle speed to a specific RPM.

With the A/C on and the throttle blade above a specific angle, the ECU de-energizes the A/C relay, preventing the air conditioning clutch from engaging until throttle blade angle is reduced.

The Sync Pulse switch, located within the distributor, generates a signal to the ECU, helping to properly synchronize injector opening with intake valve opening.