I've been getting a 1-4-4 in socket 6 lately. Car is running fine and when i remove fuse 6 to clear code it stays off for a few days but comes back. It only comes on when starting the car, never while driving. I have put in a new fuel pump relay and cleaned and squeezed the terminals. The cps is less than 1 year old. I've removed the ecu and cleaned terminals. I've cleaned terminals on all fuel injectors and maf. As stated, car's running fine, but hoping to head off any problem. Thanks.

Just guessing but maybe clean the connector to the ICU as it seems the code is related to signals to this unit.
Dan

Thanks, I think I did. There are 2 computers up in passenger footwell. I disconnected both of them, looked over all the pins (they looked good), sprayed with contact cleaner, then reattached. Light stayed out a few days then on start up this morning it reappeared.

Do you have the on the battery fuse holders?

Make sure fuse holder is nice and firm on fuses 4 and 6, replace these fuses.

There is a 4 contact connector in the same footwell that interconnects the ICU and ECU systems, you might try cleaning this also.

Dan

I'm not sure what you mean by the "on the battery fuse holders" Dan. The fuse holders are nice and tight but I will change 4 and 6 as I have spares. Will also look for 4 contact connector that you speak of.

Some of the late model 93 240's had a fuse block mounted on to + post of the battery.
Dan

No, not mine. I did change fuse 4 and 6 with newer type fuses and will drive until (if) light reappears, before looking up under passenger side again. Too cold here today in N.Y. to be fooling around outside.

"The cps is less than 1 year old."

Without making any specific recommendation, my experience includes replacing 2 Bougicord/Electricfil crank position sensors less than 1 year old. No, there was no outward sign such as the cracked sheathing we all used to look for. Internal failures and intermittently so.

However, getting a code set was not part of any symptoms I noticed. Hard starting, no starting (at times), and way-out-of-time spark during cranking (kicking the starter backward) were.
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Art Benstein near Baltimore

Two banks with different rates have a conflict of interest.

You lucky guy. I love doing that job (not).

Indeed lucky in the respect you are thinking of. The two cars with the repeat offenders in them were pre-GM AC (89 and 90). Only one elbow required on my left arm. The 91-93 cars need me laying a piece of plywood over the engine compartment. But not for long. My fingers know the CPS without any need of assistance from the eyes.
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Art Benstein near Baltimore

A successful diet is the triumph of mind over platter.

I do the same plywood thing over the engine compartment but seem to have a h--l of a time getting it in the hole along with the bolt. The best part of it is when it's done because it is cause for real celebration. Dan's mention of checking the wiring between the icu and ecu makes a lot of sense. In FAQs on this site it mentions that 1-4-4 could be caused by faulty wiring between the Lh and the ezk. I'm pretty sure that ezk and lh are synonymous with ecu and icu. So after replacing fuses 4 and 6 with newer type fuses, if that doesn't work I'll look into that wiring. Not a lot of pressure cause no one in the family is depending on this car right now. Thanks Art as always for your helpful insight on this board.

Ray, I apologize. In your original post I saw the 1-year-old CPS and decided to warn you not to believe in it, all the while thinking you were getting a code for missing engine speed signal from EZK, which, I see (chagrin) is a 214 not a 144. So forget about the plywood and the CPS replacement. Dan's advice suggesting a problem with power is a far more reasonable possibility.

In your car (the 93 without the battery-mounted fuse block) fuse 6 is the one to look at carefully. I started to write up the concerns I have for that arrangement, used 91 through mid-93 here: Main Fuse for Engine Management Systems

The four-pin plug may indeed be a 12-position plug. I say "position" because I just recently read a thread where it was called an 11-pin plug so many times, I had to give in to the reasoning that, although it has 12 places for pins, only 11 are used. :)
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Art Benstein near Baltimore

Sea captains don't like crew cuts.

Interesting stuff Art. Don't worry, I wasn't about to do the cps unless the car died on me. I have changed fuses 4 and 6 to the new brass ones and if the code returns I'll take a more thorough look at the connectors in the passenger footwell.