Printable View
Any signs of melting of the wires or burt casings. I wonder if there is a continuty issue in the harness causing the computer to shut down communications. A wiring diagram and schematic would help greatly. With this you can unplug the computer and check the basic wires for voltage, grounds or amperage..... It could be as simple as a wire rubbing the block causing dead shorts. Typically computers are good or bad, not both.
We've got a wiring diagram and plan to experiment a bit if the computer replacement doesn't fix the problem. We were hoping to avoid running the wires, hoping the problem is simpler and...less time consuming :(
This is just a wag if you are loosing comunication with the scan tool/code reader.
Unplug your sensors one at a time to see if it goes away.
Some ecms will shut down if a sensor is grounding the signal wire.Pp
Just had this happen on my jeep the crank sensor shorted out scanner would not read no cel flash on power up.
We checked the wires on some of the sensors, I'm not sure exactly how many there are but my tech was in there checking lots of wires, including grounds. We found one wire that looked to be hanging by just the insulation, we cut it and gave it a good connection but that didn't resolve the problem.
I've got the computer in my possession now and will be installing it on Friday morning, here's hoping that fixes it.
Sound like you are at the point of a wiring diagram and dig in.
Before I changed out the computer make sure all of its grounds are good.
Check for voltage where it shouldent be. Would hate to see you smoke the new puter.
I'm thinking the computer got smoked last year about mid-season. I had the hose for the raw water pump pop off (the one that went out from the pump and into the engine). It was a scary, smokey, hot-engine experience. It was the result of a faulty hose clamp, I tightened it down and idled back but basically ever since then I've had this problem. In an ideal world I'll put this computer in and everything will work splendidly, we'll see on Friday. We actually started with a wiring diagram last year and everything was good, we ran the wires last year thinking there was a short somewhere so I don't think that's what it is. If it's not the computer we'll need to start checking harnesses.
Great news, the new computer seemed to do the trick! I ran it for an hour with no problems, it even sounds like it's running better, but that could be the new distributor cap. I'm going to knock on some wood just to be safe. I'm going to take it out by myself and run it for a few hours just to make sure it's behaving normally in use and not just on a fake-a-lake.
The thing is most of the time somthing takes the puter out.
Good luck happy to hear its running.
Well I'm hoping that when my raw water hose came off and the engine overheated that maybe it caused the problems with the computer. I didn't have any problems with the boat at all until that incident, 4 years of easy ownership. I don't know what possible things could have taken out the computer otherwise? I'm hoping that the fact that the computer was missing a prong is what caused the problem and this new computer remedied it.Quote:
Originally Posted by 86 century
I would say a missing prong would do it.
If it was a ground missing could wipe it out in hurry.
Congrats atleast you have to worry about it only 55° with 20mph wind today.