ELM327P datasheet(73/76 Pages) ELM

73 / 76 page

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

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.

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. When the

Error Messages and Alerts (continued)

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 v1.4b).

Beginning with v1.3a of this IC, an LV RESET will

also block any 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 will be as a result

of overloads due to CAN wiring problems, if they

should start occurring suddenly. 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

ELM327 will print the word STOPPED. If you should

see this response, then something that you have done

has interrupted the ELM327. Note that short duration

pulses on pin 15 may cause the STOPPED message

to be displayed, but may not be of sufficient duration to

cause a switch to Low Power operation.

Version 1.3 of the ELM327 first introduced this

73 of 76

ELM327

ELM327DSH

Elm Electronics – Circuits for the Hobbyist

ELM327P Datenblatt(PDF) 73 Page - ELM Electronics

ELM327P Datenblatt(HTML) 73 Page - ELM Electronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

Datenblatt Download

Link URL