Cruise or Idle

During cruise or idle, the following actions occur:

- The ECU monitors the intake manifold air temperature based upon input signals from the charge air temperature sensor.
- If the air intake temperature is at or below 90°F (32°C), then the air temperature switch is closed, allowing voltage to flow to the KSB solenoid. When the intake air temperature increases above 90°F (32°C), the air temperature switch will open, DE-ENERGIZING the KSB solenoid.
- If the air intake heater post-heat cycle is not finished, it will be completed in this mode.
- The Throttle Position Sensor (TPS), Engine Speed Sensor, and the Vehicle Distance (speed) Sensor inputs are used to control automatic transmission overdrive operation.
- If the coolant temperature is below 60°F (16°C), the coolant temperature switch will close. If the ECU receives a signal that the coolant temperature switch is closed, the transmission will not be allowed to shift into overdrive (automatic transmission). Once the coolant temperature reaches 60°F (16°C), then the coolant temperature switch will open and the transmission will be able to be shifted into overdrive.
- If the transmission thermo-switch is open, the transmission will not be allowed to be shifted into overdrive (automatic transmission). If the transmission thermo-switch opens while the transmission is in overdrive, then the transmission will be downshifted. The opening or closing of the transmission thermo-switch is dependant upon the temperature of the transmission fluid. The thermo-switch opens at 273°F (134°C), and closes when the transmission fluid drops to 240°F (116°C).
- The ECU will illuminate the Water-In-Fuel lamp if it receives a signal from the Water-In-Fuel sensor.