Deceleration Mode

During deceleration, the ECU receives input signals from the CTS and knock sensor (1.7L), MT (1.4L), MAT, MAP, EGO, and speed sensor. It also is informed of throttle, gear (auto. trans.), 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.

While the injector is grounded, and during rapid deceleration, the ECU may stop fuel injection for a short period of time. The ECU also controls engine idle speed and throttle stop angle.