ELM327P datasheet(45/51 Pages) ELM

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ELM327

be from a wiring error. Note that some vehicles may

generate long pulses as part of their startup process,

so you may see this message as part of a normal

vehicle startup while ‘monitoring all.’

CAN ERROR

The CAN system had difficulty initializing, sending,

or receiving. Often this is simply from not being

connected to a CAN system when you attempt to send

a message, but it may be because you have set the

system to an incorrect protocol, or to a rate that does

not match the actual data rate. As with BUS ERRORs,

the CAN ERROR might also be the result of a wiring

problem, so if this is the first time using your ELM327

circuit, review all of your CAN interface circuitry before

proceeding.

FB ERROR

When an OBD output is energized, a check is

always made to ensure that the signal also appears at

the respective input. If there is a problem, and no

active input is detected, the IC turns the output off and

declares that there was a problem with the FeedBack

(FB) of the signal.

If this is an initial trial with your

ELM327, this is almost certainly a wiring problem.

Check your wiring before proceeding.

DATA ERROR

There was a response from the vehicle, but the

information was incorrect or could not be recovered.

<DATA ERROR

There was an error in the line that this points to,

either from an incorrect checksum, or a problem with

the format of the message (the ELM327 still shows

you what it received). There could have been a noise

burst which interfered, possibly a circuit problem, or

perhaps you have the CAN Auto Formatting (CAF) on

and you are looking at a system that is not of the

ISO 15765-4 format. Try re-sending the command

again – if it was a noise burst, it may be received

correctly the second time.

NO DATA

The IC waited for the period of time that was set

by AT ST, but detected no response from the vehicle.

Error Messages (Cont’d)

It may be that the vehicle had no data to offer for that

particular PID, that the mode requested was not

supported, that the vehicle was attending to higher

priority issues, or in the case of the CAN systems, the

filter may have been set to ignore the response, even

though one was sent. If you are certain that there

should have been a response, try adjusting the AT ST

time (to be sure that you have allowed sufficient time

to obtain a response), or restoring the CAN filter to its

default setting.

<RX ERROR

An error was detected in the received CAN data.

This will usually only occur if monitoring a CAN bus,

and the ELM327 is set to an incorrect baud rate, or if

monitoring and there are messages found that that are

not being acknowledged, or that contain bit errors. Try

a different protocol, or a different baud rate.

UNABLE TO CONNECT

The ELM327 has tried all of the available

protocols, and could not detect a compatible one. This

could be because your vehicle uses an unsupported

protocol, or could be as simple as forgetting to turn the

ignition key on. Check all of your connections, and the

ignition, then try the command again.

This is the standard response for a misunderstood

command received on the RS232 input. Usually it is

due to a typing mistake.

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