MIL (Malfunction Indication Lamp) - MIL Activity By Transistor
WARNING: This page is about a different variant/trim than selected.
The Malfunction Indicator Lamp (MIL) is connected between ECM or PCM-terminal Malfunction Indicator Lamp and battery supply (open collector amplifier).
In most cars, the MIL will be installed in the instrument panel. The lamp amplifier can not be damaged by a short circuit.
Lamps with a power dissipation much greater than total dissipation of the MIL and lamp in the tester may cause a faulty indication.
- At ignition ON and engine revolution (RPM)< MIN. RPM, the MIL is switched ON for a visual check by the driver.