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When two pins on the ALDL are jumped, the light would flash the codes, for instance (blink) (pause) (blink) (blink) for code 12. Some manufacturers, such as Honda, retained this feature even after OBDII. The MIL is commonly referred to today as the "check engine light" or the "service engine soon light". [6] [7] [8]
Even more advanced devices allow users to reset engine DTC codes, effectively turning off engine lights in the dashboard; however, resetting the codes does not address the underlying issues and can in worst-case scenarios even lead to engine breakage where the source issue is serious and left unattended for long periods. [36] [37]
A group of tell-tales showing lights for "brake fluid", "stop lamp" and "check engine" Graphical tell-talesA tell-tale, sometimes called an idiot light [1] or warning light, is an indicator of malfunction or operation of a system, indicated by a binary (on/off) illuminated light, symbol or text legend.
The first byte (A) contains two pieces of information. Bit A7 (MSB of byte A) indicates whether or not the MIL (malfunction indicator light, aka. check engine light) is illuminated. Bits A6 through A0 represent the number of diagnostic trouble codes currently flagged in the ECU.
An indicator lamp (or indicator light) is an illuminated device that is intended to visually convey a single status to the user of a piece of equipment. Indicator lamp may refer to: Check engine light, a tell-tale warning light in automobiles; Tell-tale (automotive), a more generic class of indicators
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