Engine Switches

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

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

Sync pulse switch, located within distributor, generates a signal to ECU, helping to properly synchronize sequential fuel injection opening with intake valve opening.