Hello again everyone

I recently diagnosed a bad check valve in the fuel pump and replaced the fuel pump and pulsator and fixed loss of fuel pressure issue I would have before startup that would cause long cranking, the car starts great now every time, (except sometimes it still cranks a little bit when the engine is hot but definitely not as long as it did before).

However I recently developed an intermitent "Service ASR" light shortly before I changed the pump, and my intermittent check engine light persists, so I cleared the codes and went for a long drive and came back and checked the codes again, I now have 3 codes:

Computer 1: H41 (Loss of communications??) This one is very new.
Computer 4: H44 (Left fuel bank lean?) I also had this code before the fuel pump replacement.
Computer 9: H72 (No idea what this code is but I know it's for the ASR) Recently "Service ASR" light came on and now finally I have a code for it.

I used to have an H55 code but that code seems to be gone now.

I have been having issues finding a trouble code list for computers 1 and 9, I know Computer 9 is for the ABS/ASR modules and that computer 1 is the CCM(?)

I used to have an H55 code but that code seems to be gone now, that and Code 44 were the only codes I've had not long ago.

I've changed both of the Oxygen sensors, ohmed out the injectors (each around 32-33), fuel pump replaced. I did a fuel pressure test in my last post (before I changed the pump, maybe I need to do another one now) and everything checked out just fine. The car runs perfect and drives perfectly fine.

What else do I need to check to fix this code H44? What is code H72 for, how can I diagnose this intermittent "Service ASR" issue? Should I be concerned with that H41 code? Thanks for any help and advice!

My car is a 93 6 speed with 61,736 miles.

 

Well this is weird, I realized the pulsator I JUST put on was leaking, so I deleted it and replaced it with some hose and clamps, and deleted the codes and went for a short drive and the codes aren't back. I'm willing to bet that H72 ASR code will come back though and probably the H44, hopefully that H41 code stays gone though...

 

I hope you have found the problem with your car. 92-93 Vett ECM’s have had some problems with the solder joints inside it. Could be causing the code 41.

 

I remember seeing somewhere a guy was having an issue with his "Service ASR" light coming on in his 93 every 15-20 minutes of driving and he ended up diagnosing it as a bad ECM. Hopefully mine is alright... I should probably pick up a field service manual sometime and diagnose it if the codes come back. Are these ECM's hard to repair? Thanks

 

The solder in the ECM can be reflowed. Several members have sent theirs to SIA Electronics. You can search Google for threads on it.

 

Thank you. I've did a little bit more driving and it's still been off (fingers crossed) and the codes have remained off. So I'm hoping everything remains fine.

 

Watch for it to be heat related and watch for other lights/signals (such as SYS on LCD and security light flashing while driving). It’s not a big deal to get it reflowed…

 

Yeah, "service ASR" light came back on, code H41 for computer 1, computer 9 H72 again, but no H44 anymore which is good, I'll probably pick up the field service manual and diagnose it before just ripping out the ECM. Also my long crank issue came back again...