Aerostar 2WD V6-183 3.0L (1991)
Malfunction Indicator Lamp: Description and Operation
The Malfunction Indicator Light (MIL) is mounted in the dash and reads CHECK ENGINE or SERVICE SOON. The MIL will ILLUMINATE when
the engine is operating in Failure Mode Effects Management (FMEM). The light will stay ON as long as there is a fault in the system. The MIL can also
be used to retrieve fault codes from the Electronic Engine Control (EEC) system when the self test mode is entered.