Manual Elm 327 (page 37 of 94) (English)

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ELM327

ELM327DSJ Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

based on any active inputs that are present. If you

need to follow the SAE J1978 order, you should send

the ELM327 an AT SS command first, or step through

each protocol with the TP command.

The automatic search works well with OBDII

systems, but may not be what you need if you are

experimenting. During a search, the ELM327 ignores

any headers that you have previously defined (since

there is always a chance that your headers may not

result in a response), and it uses the default OBD

header values for each protocol. It will also use

standard requests (ie 01 00) during the searches. If

this is not what you want, the results may be a little

frustrating.

To use your own header (and data) values when

attempting to connect to an ECU, do not tell the

ELM327 to use protocol 0. Instead, tell it to either use

Selecting Protocols (continued)

only your target protocol (ie. AT SP n), or else tell it to

use yours with automatic searches allowed on failure

(ie AT SP An). Then send your request, with headers

assigned as required. The ELM327 will then attempt to

connect using your headers and your data, and only if

that fails (and you have chosen the protocol with AT

SP An) will it search using the standard OBD default

values.

In general, 99% of all users find that enabling the

memory (setting pin 5 to 5V) and using the ‘Auto’

option when searching (you may need to send AT

SP 0) works very well. After the initial search, the

protocol used by your vehicle becomes the new

default, but it is still able to search for another, without

your having to say AT SP 0 again.

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Elm 327 Manual

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