Bedienungsanleitung Elm 327 (Seite 88 von 94) (Englisch)

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ISO 15765-4 format. Try resending the command

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

correctly the second time.

ERRxx

There are a number of internal errors that might be

reported as ERR with a two digit code following. These

occur if an internally monitored parameter is found to

be out of limits, or if a module is not responding

correctly. If you witness one of these, contact Elm

Electronics for advice.

One error that is not necessarily a result of an

internal problem is ERR94. This code represents a

‘fatal CAN error’, and may be seen if there are CAN

network issues (some non-CAN vehicles may use pins

6 and 14 of the connector for other functions, and this

may cause problems). If you see an ERR94, it means

that the CAN module was not able to reset itself, and

needed a complete IC reset to do so. You will need to

restore any settings that you had previously made, as

they will have been returned to their default values.

Beginning with v1.3a of this IC, an ERR94 will also

block further automatic searches through the CAN

protocols, if bit 5 of PP 2A is a ‘1’ (it is by default). This

is done because most ERR94s will be as a result of

serious CAN wiring problems. Blocking of the CAN

protocols remains in effect until the next power off and

on, or until an AT FE is sent.

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.

LP ALERT or !LP ALERT

This appears as a warning that the ELM327 is

about to switch to the Low Power (standby) mode of

operation in 2 seconds time. This delay is provided to

allow an external controller enough time to prepare for

the change in state. No inputs or voltages on pins can

stop this action once initiated. Note that the ‘!’ before

LP ALERT is printed if PP 0F bit 1 is 1.

Error Messages and Alerts (continued)

LV RESET

The ELM327 continually monitors the 5V supply to

ensure that it is within acceptable limits. If the voltage

should go below the low limit, a ‘brownout reset’ circuit

is activated, and the IC stops all activity. In rare cases,

a sudden large change in VDD can also trigger a low

voltage reset.

When the voltage returns to normal, the ELM327

performs a full reset, and then prints LV RESET. Note

that this type of reset is exactly the same as an AT Z

or MCLR reset (but it does not print ELM327 v2.1).

An LV RESET will also block automatic searches

through the CAN protocols, if bit 4 of PP 2A is a ‘1’ (it

is by default). This is done because most LV RESETs

seem to occur as a result of CAN wiring problems (the

transceiver is capable of passing very large currents).

Blocking of the CAN protocols is only done until the

next reset (AT Z, WS, etc.) or until an AT FE is sent.

NO DATA

The IC waited for the period of time that was set

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

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 so that the response was

ignored, even though one was sent. If you are certain

that there should have been a response, try increasing

the ST time (to be sure that you have allowed enough

time for the ECU to respond), or restoring the CAN

filter to its default setting.

<RX ERROR

An error was detected in the received CAN data.

This most often occurs if monitoring a CAN bus using

an incorrect baud rate setting, but it may occur if

monitoring and there are messages found that are not

being acknowledged, or that contain bit errors. The

entire message will be displayed as it was received (if

you have filters set, the received message may not

agree with the filter setting). Try a different protocol, or

a different baud rate.

STOPPED

If any OBD operation is interrupted by a received

RS232 character, or by a low level on the RTS pin, the

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ELM327

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www.elmelectronics.com

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