Seville V8-300 4.9L (1991)
Maintenance Required Lamp/Indicator: Description and Operation
Also known as "SERVICE TELLTALE" lamp or "SERVICE ENGINE SOON" and "SERVICE VEHICLE SOON" lamps, the lamps are used to inform
the technician that a malfunction of the CEC system has occurred. The "SERVICE TELLTALE" lamps are checked for proper operation while the
engine is cranking, and will turn off after the engine is running.
Depending on the trouble code set, the "SERVICE VEHICLE SOON" lamp or the "SERVICE ENGINE SOON" lamp will come on and stay on while
the malfunction is taking place. If a malfunction is intermittent, the service lamp that came on will go out when the malfunction is no longer detected by
the computer. When a "SERVICE VEHICLE SOON" or "SERVICE ENGINE SOON" malfunction is detected by the computer at the same time, only
the "SERVICE ENGINE SOON" lamp will come on. Both lamps stay on while the system is in diagnostic mode.
