Deceleration Mode

During deceleration, the ECU receives inputs from the CTS, MAT, MAP, EGO, speed and knock sensors. It also is informed of throttle, gear (automatic transaxle models) and A/C control position.

When the ECU receives deceleration input from the closed throttle (idle) switch, it grounds the EGR valve/canister purge solenoid. This interrupts vacuum to EGR valve and canister purge function. The injector is grounded, and during rapid deceleration, the ECU may stop injection for a short period of time. The ECU also controls engine idle speed and throttle stop angle.