F 250 2WD Pickup V8-7.3L DSL Turbo VIN F (1994)
Wait To Start Light: Description and Operation
Glow Plug Lamp Control
The Glow Plug Lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the
engine. The cylinders are being warmed by the glow plugs while this light is on.
The Powertrain Control Module (PCM) energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is low, the WAIT TO START light is turned on.
The glow plug lamp is controlled by the following sequence:
1. PCM lights the WAIT TO START light after a key on reset occurs. The PCM determines the glow plug lamp activation time based on engine oil
temperature, barometric pressure and battery voltage.
2. PCM turns off the WAIT TO START light. The glow plug lamp is turned off when the timer counts to the number of seconds specified by the
PCM.
