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Speculation mode 900 1993

posted by  B.B. on  Sun Jun 11 22:46 CST 2023
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hi Amarin,

Thanks for all the comments.
OK about being a forensic pathologist. Years a go a ham radio friend, a dentist, got bored and went back to school to become a pathologist.
He helped me quit smoking when he explained what smokers and non-smokers lungs look like.
He did me a huge favor.

I did some more looking around LH circuitry and noticed two "Bridge connectors"
by the LH module harness: 18/1 & 18/2. They make a jumper between LH pins 19 & 29.
These look like Volvo diagnostic ports. Do you know anything about this?

I looked again at your posts Sep/Oct 2022 and nice photos of the EZK module.
OK about the hassle with plated through holes on PCBs. I was introduced to that issue in the early 80's having to repair Kenwood TS-930S, and TS-940S transceivers that had a huge problem after Kenwood forgot how to wave solder. The ugliest to fix is when the plated through holes are buried under an LSI.
You have to become skilled with solder wick and/or solder suckers.
BTW Kenwood never owned up to it. :-(

Do you have more photos of the boards and plated through holes?
I would first look at LH circuit traces out to C3 and the (Main Fuel relay)

I use a Opti-Visor magnifying headset here. Maybe there's something better?

Buying a used module will be a last resort here, since it probably is also
full of bugs. I'd rather fix the devil I know.

Another cool comment you made, is worth repeating for the gang.
If your engine quits.
Clear the ECUs simply by pulling Fuse 1
Wait 2 minutes to put it back and see if you get lucky.
Be sure to post back to share your results.

Thanks, Bill





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