Code 41 = new ECM?

[XfireZ51]

I’m assuming u cleared the ECM pulling neg BATT cable right? Otherwise the 41 would still be in History.

[XfireZ51]

Originally Posted by Weeberone

Ok. So after sitting over night and reseating the PROM and 4 connectors to the ECM, it seems to be talking with the CCM again. No more CCM code 41 and "Err" at number 4.

The fan stays off with the engine off now, but when starting there is still a high idle and now the check engine light comes on, which it wasn't doing before. The CCM gives a c12 code, but the ECM gives a code 14 "coolant sensor high temp" and a 41 "cylinder select error"

When I erase these codes and start the car it sounds fine for about a couple seconds the the check engine light comes on and the idle increases and it shows the same 2 codes.

Any suggestions?

Just read this part. The prom may be corrupted. If u have another one, try putting it in and see what happens. Hans had a cylinder select error come up when we were tuning his 90.

[Weeberone]

I don't have another chip to try, unfortunately. I'm not against buying one, I was going to get a Mark Haibeck one eventually anyway.

I disconnect the battery with each thing I try.

Is there anything else I could try that would make the corrupted chip theory more definitive?

I have a track day in 4 weeks and I need this bad boy running by then.

[XfireZ51]

Originally Posted by Weeberone

I don't have another chip to try, unfortunately. I'm not against buying one, I was going to get a Mark Haibeck one eventually anyway.

I disconnect the battery with each thing I try.

Is there anything else I could try that would make the corrupted chip theory more definitive?

I have a track day in 4 weeks and I need this bad boy running by then.

If u have a cylinder select issue, you’ll need a chip burned to remove that flag.
Send me a PM.

[G8nightman]

Why would you think it’s the chip OP said he washed his car then everything went wrong. You said you didn’t spray water at the ecm did you spray at the motor there’s a bunch of stuff under plenum that shouldn’t get wet.


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[Weeberone]

Originally Posted by G8nightman

Why would you think it’s the chip OP said he washed his car then everything went wrong. You said you didn’t spray water at the ecm did you spray at the motor there’s a bunch of stuff under plenum that shouldn’t get wet.


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The spray was mostly on the heads and frame rails, but some water could have got under plenum.

After I washed it I would normally run the engine to dry everything, but I got called away and the car sat in the sun with the hood closed. I'm thinking would have got very humid under there.

[XfireZ51]

Originally Posted by Weeberone

The spray was mostly on the heads and frame rails, but some water could have got under plenum.

After I washed it I would normally run the engine to dry everything, but I got called away and the car sat in the sun with the hood closed. I'm thinking would have got very humid under there.

Its possible the coolant sensor got fried which would cause the motor to act like it does. The cylinder select could be a function of that or not. I have run into the cylinder select issue for some reason on several ZRs including mine.

[Ccmano]

Originally Posted by G8nightman

Why would you think it’s the chip OP said he washed his car then everything went wrong. You said you didn’t spray water at the ecm did you spray at the motor there’s a bunch of stuff under plenum that shouldn’t get wet.


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That’s where the codes are pointing us too. It’s possible a short elsewhere caused an issue with the chip. You have to follow the trail of the codes. Codes only point you to possible problem area. They do not tell you precisely what’s wrong.
H

[G8nightman]

Originally Posted by Ccmano

That’s where the codes are pointing us too. It’s possible a short elsewhere caused an issue with the chip. You have to follow the trail of the codes. Codes only point you to possible problem area. They do not tell you precisely what’s wrong.
H

[Weeberone]

I took out the chip one more time. Made sure it was seated properly (with the battery disconnected). Put it back together, hooked up the battery, made sure there were no stored codes and started her up. Idled around 2000 still and after about 10 seconds the check engine light came on. Checked the code, still code 41. I guess I’ll get a new chip see how that goes.


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