Ignition Switch On

When the ignition switch is turned to the ON position, the following actions occur:

- The ECU receives battery voltage and an ignition sense input. Once the ECU receives the ignition sense input, it becomes activated and begins to interact with its input and output devices.
- The ECU illuminates the Wait-To-Start lamp, and the Water-In-Fuel lamp for 2.8 seconds as a bulb check.
- The ECU will monitor the input signal from the charge air temperature sensor. If the ECU receives a signal from the charge air temperature sensor that the intake air temperature is at or less than 59°F (15°C), then the ECU will start the air intake heater preheat cycle. When the ECU starts this cycle, it illuminates the Wait-To-Start lamp until it is finished. The ECU ENERGIZES the air intake heaters by grounding the air intake heater relays.
NOTE: If the ECU receives an engine crank signal before the preheat cycle is finished, it will abort the preheat cycle and shut off the Wait-To-Start lamp.
- The ECU will illuminate the Water-In-Fuel lamp if a signal is sent to the ECU from the Water-In-Fuel sensor.
- The ECU monitors engine speed. When the engine speed is above 384 RPM, the controller determines the engine is running.