What Protocol? - Felicia 1.3 SPI

Lhx · 29-07-2006, 00:17

Just wanted to ask if anyone knows what protocol is used in '97 Felicia 1.3 SPI on the diagnostic bus (only ground/Vbatt/ISO-K pins are present). The possibilities are:
ISO 9141 - maybe
ISO 14230 (Keyword 2000) - negative... this standard came after the car was made
Keyword 1281 - probable, typical to VAG cars

The question to everybody with an RS-OBD2 wire and an early Felicia: Can you communicate with the ECU through ISO9141? Or does it only speak KW 1281?

Update: I noticed VAG-COMs display the protocol currently used, so it'll probably check for the native KW1281 and it's compatibility can be checked... I don't know if it can be forced to use some other protocol if KW1281 is present.

Theresias · 29-07-2006, 02:42

VAG models from that year support KWP-1281 only, besides that ISO-9141 is no protocol.

Everything else would be a modified protocol of the control module manufacturer.

Lhx · 29-07-2006, 08:58

Thanks... and I wish I knew 9141 was only some kind of other related specification, but ISO's prices are too high for an average student to afford

Oh, and BTW would anyone be interested in a microcontroler with LCD display support to read stuff from the ECU? I suppose I'll publish the schematic+software somewhere anyway, but if there will be many users I'll try to make it easier to customise (not all data can be shown at once).

29-07-2006, 00:17	#1
Lhx Briskodian Join Date: Jul 2005 Location: Poland Posts: 26 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	What Protocol? - Felicia 1.3 SPI Just wanted to ask if anyone knows what protocol is used in '97 Felicia 1.3 SPI on the diagnostic bus (only ground/Vbatt/ISO-K pins are present). The possibilities are: ISO 9141 - maybe ISO 14230 (Keyword 2000) - negative... this standard came after the car was made Keyword 1281 - probable, typical to VAG cars The question to everybody with an RS-OBD2 wire and an early Felicia: Can you communicate with the ECU through ISO9141? Or does it only speak KW 1281? Update: I noticed VAG-COMs display the protocol currently used, so it'll probably check for the native KW1281 and it's compatibility can be checked... I don't know if it can be forced to use some other protocol if KW1281 is present. Last edited by Lhx; 29-07-2006 at 00:19.

29-07-2006, 02:42	#2
Theresias Briskodian Join Date: Apr 2006 Location: Mid Germany Posts: 417 Members Car: MY 2007 Thanks: 1 Thanked 30 Times in 27 Posts	Re: What Protocol? - Felicia 1.3 SPI VAG models from that year support KWP-1281 only, besides that ISO-9141 is no protocol. Everything else would be a modified protocol of the control module manufacturer. __________________ Sebastian

29-07-2006, 08:58	#3
Lhx Briskodian Join Date: Jul 2005 Location: Poland Posts: 26 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	Re: What Protocol? - Felicia 1.3 SPI Thanks... and I wish I knew 9141 was only some kind of other related specification, but ISO's prices are too high for an average student to afford Oh, and BTW would anyone be interested in a microcontroler with LCD display support to read stuff from the ECU? I suppose I'll publish the schematic+software somewhere anyway, but if there will be many users I'll try to make it easier to customise (not all data can be shown at once).

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