144
DTC 522545 MIL (Malfunction Indicator Lamp) Open
Circuit Description
The Spectrum Fuel system is equipped with OBD (On-Board Diagnostics). The system has a
dash mounted MIL (Malfunction Indicator Lamp). The MIL serves as notification of an emis-
sions related problem. It will display DTCs that have been stored due to a possible system
malfunction. The following DTC charts in this manual will instruct the technician to perform
the OBD system check. This simply means to verify the operation of the MIL. The lamp
should illuminate when the key is in the ON position, and the engine is not running. This fea-
ture verifies that the lamp is in proper working order. If the lamp does not illuminate with the
vehicle Key ON and engine OFF, repair it as soon as possible. Once the engine is in start or
run mode, the lamp should go off. If the lamp stays on while the engine is in the start or run
mode, a current diagnostic trouble code may be set or a problem may exist with the MIL elec-
trical wiring. The electrical schematic above shows the MIL power source supplied to the
lamp. The ECM completes the circuit to ground to turn the lamp ON.
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