Closed Throttle Position (CTP) Switch

CTP switch closes at about 1.5 degrees before primary throttle plates close. When CTP switch is closed, a ground signal is supplied to MFI ECM. MFI ECM uses this ground signal to activate the following functions:

• Idle stabilization
• Deceleration fuel shut-off with engine warm and engine speed greater than 1500 RPM. Fuel supply is reactivated when engine speed falls to less than 1200 RPM
• Special ignition map for deceleration.