Engine Warm-Up

During engine warm-up, the following actions occur:

- The ECU will start the post-heat cycle if the intake air temperature, when the engine was started, was at or less than 59°F (15°C).
- 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 coolant temperature is below 60°F (16°C), the coolant temperature switch will close. When the ECU receives a signal that the coolant temperature switch is closed, it prevents the transmission from shifting into overdrive (automatic only). Once the coolant temperature reaches 60°F (16°C), the coolant temperature switch will open.
- The ECU will illuminate the Water-In-Fuel lamp if it receives a signal from the Water-In-Fuel sensor.