Code 41 = new ECM?

[XfireZ51]

Originally Posted by 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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So no more coolant temp code?

[Weeberone]

Originally Posted by XfireZ51

So no more coolant temp code?

No coolant code. That one went away after the first time I completely disconnected the ECM and blew out the terminals. Just the 41 on the ECM codes now. The CCM codes give a C12 which I believe means all good.

I sent you a PM.

[Hib Halverson]

What model year is this car?

[Weeberone]

Originally Posted by Hib Halverson

What model year is this car?

1990

[Hib Halverson]

Originally Posted by Weeberone

That’s rich. I wish I had the original. There’s a sticker on the other side which might be a date. 1995



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That's probably the date that the "tuner" burned the chip.

I'm thinking there still is a problem with a bad connection at the memcal connector in the ECM. I base that on the fact that the code 14 went away after cleaning the ECM connections which tends to reinforce the idea that the problem is a bad connection that became bad during the washing process.

Before I'd spend the money on a new cal chip, I'd go buy yourself a spray can of electrical contact cleaner. Usually you can find that at an electronics supply store or an industrial hardware store but maybe even Lowes or HomeDepot.

Unplug the four ECM connectors and spray contact cleaner into both the connectors and the ECM sockets. Then carefully plug and unplug each connection a couple of times. Finally, spray contact cleaner on the connectors and sockets, again, and let the cleaner air dry away for several seconds, then reconnect all four connectors.

Then, remove the cal chip, spray contact cleaner onto the socket in the ECM and on the bottom of the chip. Then carefully install and remove the chip a couple of times. Finally spray contact cleaner on the socket and the chip again, let them dry then reinstall the chip.

Clear codes and road test.

If code 41 resets, replace the cal chip. If the code still persists, replace the ECM.

[XfireZ51]

Hib,

I think he was going to get a performance upgrade cal from Marc Haibeck anyway. This way he’ll kill 2 birds ...

[Weeberone]

New MH chip on the way.

I cleaned the contacts once already with some 99% isopropyl. I do have some DeOxit for my audio equipment, I’ll give that a try just like you describe. There’s a lot dielectric grease on everything, makes it hard to clean.

If this new chip fails to get rid of this code, anyone out there have a working ECM for sale, just in case I need it?

[XfireZ51]

If u r checking codes, the first one u should get is a
Code 12 which is an ECM self test. If u get that, the ECM is ok.

[Weeberone]

Originally Posted by XfireZ51

If u r checking codes, the first one u should get is a
Code 12 which is an ECM self test. If u get that, the ECM is ok.

Yes, under category 1 I get a C12 then the 3 dashes - - - then under category 4 I get H41 then the 3 dashes - - -.

To you, that indicates a healthy ECM?

[XfireZ51]

From what u are describing, the codes u r getting are on the cluster and from the CCM, nit the ECM. ECM CODES will flash on the DIC.