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ELM320DSC Datasheet(PDF) 11 Page - ELM Electronics |
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ELM320DSC Datasheet(HTML) 11 Page - ELM Electronics |
11 / 16 page Error Messages 11 of 16 ELM320 ELM320DSC Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Resetting Trouble Codes When hardware or data problems are encountered, the ELM320 will respond with one of the following short messages. Here is a brief description of each… BUS BUSY The ELM320 tried to send the mode command or request for about 0.5 seconds without success. Messages are all assigned priorities, which allows one message to take precedence over another. More important things may have been going on, so try re-issuing your request. BUS ERROR An attempt was made to send a message, and the data bus voltage did not respond as expected. This could be because of a circuit short or open, so check all of your connections and try once more. DATA ERROR There was an incomplete message received, and it was not enough to form a meaningful response. This may have been caused by the key being turned off, or a loose connection, for example. Any monitoring that was in progress will have been aborted. <DATA ERROR The error check result (CRC byte) was not as expected, indicating a data error in the line pointed to (the ELM320 still shows you what it received). There could have been a noise burst which interfered, or a circuit problem. Try re-sending the request. NO DATA There was no response obtained from the vehicle before a timeout occurred. The mode requested may not be supported, so the vehicle ignored you, or the timeout value was too short, or possibly the ignition key needs to be turned to ‘on’. Try issuing a 01 00 command to be sure that the vehicle is ready to receive commands, and if that works, try adjusting the timeout to a longer value using the Set Timeout AT command. ? This is the standard response for a misunderstood command received on the RS232 bus. Usually it is due to a typing mistake. The ELM320 is quite capable of resetting diagnostic trouble codes, as this only requires issuing a mode 04 command. The consequences should always be considered before sending it, however, as more than the MIL (or ‘Check Engine’ lamp) will be reset. In fact, issuing a mode 04 will: - reset the number of trouble codes - erase any diagnostic trouble codes - erase any stored freeze frame data - erase the DTC that initiated the freeze frame - erase all oxygen sensor test data - erase mode 06 and 07 test results Clearing of all of this information is not unique to the ELM320, as it occurs whenever a scan tool is used to reset your codes. Understand that the loss of this data could cause your car to run poorly for a short time while the system recalibrates itself. To avoid inadvertently erasing stored information, the SAE specifies that scan tools must verify that a mode 04 is intended (“Are you sure?”) before actually sending it to the vehicle, as all trouble code information is immediately lost when the mode is sent. Recall, though, that the ELM320 does not monitor the content of messages, so it will not know to ask for confirmation of the mode request - this would have to be the duty of a software interface if one is written. As stated, to actually erase diagnostic trouble codes, one need only issue a mode 04 command. A response of 44 from the vehicle indicates that the mode request has been carried out, the information erased, and the MIL turned off. Some vehicles may require a special condition to occur (the ignition on but the engine not running, etc.) before it will respond to a mode 04 command. That is all there is to clearing the codes. Once again, be very careful not to inadvertently issue an 04! |
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