3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Wait To Start Light: Description and Operation
This lamp is illuminated by the PCM based on the input from the charge air temperature sensor. This light is illuminated when the ignition switch is
turned to the ON position. It remains on for two seconds as a bulb test.
If the PCM receives a signal from the charge air temperature sensor indicating that the intake air temperature is at or below 59°F (15°C), and if the PCM
has not received an engine crank signal, then the PCM will illuminate the Wait-To-Start lamp. If this light is illuminated, it indicates that the intake air
heaters have been ENERGIZED and the preheat cycle has begun. This light remains illuminated until; the preheat cycle is finished, or the PCM receives
an engine crank signal.
The Wait-To-Start lamp will flash ON and OFF if the charge air temperature sensor input to the PCM is above maximum value or below minimum value.
If either of the previous conditions occur, a DTC will be stored in the PCM's memory.
