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05-08-2019
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#41 | |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Code 41 = new ECM?
Quote:
H refers to HISTORY Codes I think you have no active codes.. if it was a C41, then I would be a bit more concerned.. What are the symptoms you are seeing?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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05-08-2019
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#42 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,685
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Re: Code 41 = new ECM?
So the 90’s show ECM malf codes on the cluster not the DIC?
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05-08-2019
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#43 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Code 41 = new ECM?
Both, depends how you are checking it..
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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05-08-2019
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#44 | |
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Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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Re: Code 41 = new ECM?
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When it is running it idles at about 2000 rpm and stumbles and dies if you try to drive. |
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05-08-2019
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#45 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Code 41 = new ECM?
C41 will not cause a stumble and die.. I did a 1991 dash in a 1989 and tried to use a 1992 CCM, it would not work and I had a Code 41 (Active) but yet i could drive the car.. no issues
I ended up with a 1991 CCM to fix the issue, however.. I think you are looking in the wrong spot for the issue you are having
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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05-08-2019
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#46 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,843
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Re: Code 41 = new ECM?
We are focused on the ECM and Memcal here, but these symptoms sound an awful lot like a vacuum line off on the MAP sensor or even a bad MAP sensor. Have you checked the MAP sensors?
H 
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05-08-2019
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#47 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,685
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Re: Code 41 = new ECM?
Well if its an ECM MALF then it would cause the issue he is experiencing.
Basically its defaulting to limp home mode. |
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05-08-2019
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#48 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Code 41 = new ECM?
Quote:
Module 4 is H41, that is CCM HE has another issue, not ECM related in my opinion..
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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05-08-2019
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#49 | |
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Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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Re: Code 41 = new ECM?
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The vacuum hose is still attached to the MAP sensor. |
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05-08-2019
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#50 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Code 41 = new ECM?
just checked the FSM.. yes.. 1 is CCm 4 is ECM
Error is 41 Cylinder Select see diagnostic pages attached
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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