But a code reader is NOT a scan tool because it only reads and clears codes. Some code readers can also display the "ready" status of various OBD II monitors (ready means the monitor has completed its self-check process). Code readers are relatively inexpensive and typically sell for under $50.Ī code reader can also clear codes to turn off the Check Engine light. The least expensive models only display a number while the better ones also provide a definition (some are even bilingual and can display in English, Spanish or French). A code reader can access and display codes from your vehicle's computer. The most basic type of scan tool is a simple code reader. So all codes now are digital and require a plug-in scan tool to read them.
Most flash codes used a combination of long and short flashes to indicate double digit codes, and if the vehicle has more than one code, it may be tricky to tell when one code ends and the next one begins. Besides, counting flashes accurately can be challenging even for experienced technicians. Manual flash codes were mostly discontinued in 1996 when OBD2 arrived. You then look up the code number in a reference chart to find out why the light is on. This puts the powertrain control module (PCM) into a self-diagnostic display mode, causing it flash out the code via the Check Engine Light (Malfunction Indicator Lamp or MIL). READING TROUBLE CODESOn most 1995 and older pre-OBD2 domestic vehicles (OBD1), diagnostic trouble codes can be read manually by grounding or jumping certain terminals on the vehicle's diagnostic connector. A scan tool allows you to read faul codes and other diagnostic information.
When your Check Engine Light is on, you have to access the vehicle's onboard diagnostics with a code reader, scan tool or scanner software to find out what's wrong.
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