LW200 L4-2.2L VIN F (2003)
Malfunction Indicator Lamp: Description and Operation
Malfunction Indicator Lamp (MIL) - Description
The malfunction indicator lamp MIL (SERVICE ENGINE SOON telltale) is in the instrument cluster and it informs the driver that a problem has
occurred and that the vehicle should be taken in for service as soon as reasonably possible.
As a bulb and system check, the lamp will come On with the key On and the engine not running. When the engine is started, the telltale will turn Off. If
the telltale remains On, the self-diagnostic system has detected a problem. If the problem goes away, the lamp will turn Off in most cases after three trips,
but a diagnostic trouble code will remain stored in the PCM.
If the telltale remains On while the engine is running, or when a malfunction is suspected due to a driveability problem, an on-board diagnostic system
check (OBD system check) must be performed. These checks will expose malfunctions which may not be detected if other diagnostics are performed
prematurely. (Refer to the "Vehicle On Board Diagnostic [OBD] System Check".) See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview
