Search found 12 matches

by hamhock75
Fri Sep 29, 2017 9:06 am
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

Thank you for that information. I ordered a FTDI part off eBay. What came was the Prolific part. I might look into trying to get another bridge that really is FTDI to see if I can get this to work. In the meantime the Snap On tester said I had a bad TPS ( throttle position sensor ), bad park/neutral...
by hamhock75
Fri Sep 08, 2017 11:27 am
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I had to give up trying to use Tuner Pro for now. Found an auto repair shop that read the 1994 Buick code with a Snap On tester for $20. It said the Throttle Position Sensor was at +4.92 volts all the time. Removed the TPS and found it open circuit. Fortunately I have a spare. I haven't given up on ...
by hamhock75
Fri Aug 04, 2017 1:14 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I spoke too soon. The software runs, the cable connects, everything acts like it is working but there is a problem.

The errors identified do not appear to be correct.
by hamhock75
Fri Aug 04, 2017 2:20 am
Forum: General Motors
Topic: Who Needs An ADS or ADX?
Replies: 368
Views: 513453

I could use A263. Can you mention what is needed to create a specific .ads?
by hamhock75
Wed Jul 19, 2017 6:16 pm
Forum: General Motors
Topic: MEFI ADX Connection Problem
Replies: 5
Views: 4912

Just a thought. I am new to this myself and just was able to get the Tuner ProRT software working with my L82 engine. The first thing I checked was what the voltage levels are from the DLC. I understand it can be 0-5 volts or 0-12 volts. 0-5 volts is TTL levels which the USB to Serial TTL adapter ca...
by hamhock75
Wed Jul 19, 2017 2:57 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

1FA definition worked! So the OBD1 compliant Buick has an OBD2 data stream. Found my problem too. Error in EGR solenoid 3. Might have to cough up the $39 for Tuner ProRT. Too bad it takes so much effort to find out if it will work but I guess there is so much confusion with these 94 and 95 cars that...
by hamhock75
Wed Jul 19, 2017 2:34 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

It worked. The I/O Gear GUC232 USB to RS232 adapter followed by the Maxim MAX232 RS232 to TTL chip allowed me to connect up. The MAX232 is running off an HP6205C power supply at the moment because it needs +5 VDC. I loaded the wrong definition file though. I used A247 from the OBD1 list because this...
by hamhock75
Tue Jul 18, 2017 4:40 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I built the little two transistor converter from RS232 to aldl and vice versa from the paper above. It seems to be the same circuit shown here. http://forums.parallax.com/discussion/131711/parallax-usb-rs232-converter-diy-aldl-odb1-cable I should have realized it would not work. The I/O Gear USB to ...
by hamhock75
Tue Jul 18, 2017 9:07 am
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I am making some progress. Found this article about vehicles of this vintage. http://www.academia.edu/1963748/A_Simple_Serial_Data_Interface_for_OBD-I_Compliant_General_Motors_Vehicles_1982-1995_ I bought an I/O Gear GUC232 adapter from a local store for $10. Installed it on my laptop. Set it to por...
by hamhock75
Sun Jul 16, 2017 1:29 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I discovered something new from Wikipedia regarding OBD1. General Motors, some 1989–1995 Ford vehicles (DCL), and some 1989–1995 Toyota/Lexus vehicles have a live sensor data stream available, however, many other OBD-I equipped vehicles do not This 1994 has live sensor data stream according to t...
by hamhock75
Fri Jul 14, 2017 12:41 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

I left something off. The purple wire is labelled "diagnostic enable signal - SIR" SIR is the supplemental inflatable restraint system ( i.e. airbag ) test enable.
by hamhock75
Thu Jul 13, 2017 2:18 pm
Forum: General Motors
Topic: Reading 1994 Buick Century "Service Engine Soon" c
Replies: 11
Views: 7891

Reading 1994 Buick Century "Service Engine Soon" c

I have a 1994 Buick Century. The emissions sticker says it is OBD1 compliant. It has a 12 pin aldl connector with only three pins. 1. Pin A is black/white ground 2. Pin M is an orange wire - serial data signal 3. Pin K is a purple wire - diagnostic enable signal The above descriptions of the wires a...