![]() The ScanGauge II has 10 memories which can be used to store an OBDII command. If a response is displayed, it has passed the check and you don’t need to bother with the check value. The ScanGauge II validates the response by using the check value before the response is displayed. The responses also include a check value which is displayed by the ScanGauge II. The ScanGauge adds this to what you tell it to send, so you don’t have to worry about it. The commands use a checksum to verify that the data was received correctly. Non-CAN ScanGauges will show the MODE by using MORE>MODE>READ. When the ScanGauge has connected to the vehicle computer, CAN capable ScanGauges (Version 2.xx) will tell you the MODE by using MORE>MORE>MODE. You will have to know the MODE your vehicle is using. OBDII Commands have a structure which depends on the protocol (MODE in the ScanGauge II). I’ll leave the discussion of why computers like 16 numbers instead of 10 for someone else. 1A23D4 is an example of a hex-a-decimal number. “7F” is an example of a hex-a-decimal byte. Each “Byte” actually contains 2 hex-a-decimal digits. Hex-a-decimal uses the numbers 0 to 9 just like decimal, but adds the letters “A” through “F” as “numbers”. For those who are not that deep into computers, don’t worry, it can be broken down into some simple sequences of numbers and letters. This should make it easier for those familiar with the language of computers. The trick is in the encoding and decoding of the requests and returned data.ĭata in the OBDII system uses hex-a-decimal bytes, just like most computers. The CMNDS function in the ScanGauge II allows you to send OBDII requests and receive OBDII responses. Although the ScanGauge II cannot tell you which ones your state allows, it can tell you which ones have not been completed. The ones that are allowed differ from state to state. Some states allow the vehicle to pass emissions even if certain tests have not been completed. Even though there are no trouble codes, you may still fail emissions because some required tests have not been completed. If you see “-Not Ready-“, some tests haven’t been run. You are ready to pass the emissions check. If you see “-Ready-” in the second line after pressing SCAN, all the tests have been run and there are no trouble codes. The bad news is if it hasn’t completed them the vehicle may not be passed. The good news is that if the vehicle has completed testing its emissions systems since the last time the battery was disconnected or the trouble codes reset, the test takes only seconds to pass. Some states are now using the OBDII connector for emissions testing. ![]()
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