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05-08-2019
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#41 | |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,173
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Re: Code 41 = new ECM?
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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 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: 9,711
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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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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-08-2019
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#43 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,173
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Re: Code 41 = new ECM?
Both, depends how you are checking it..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s 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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1990 Red/Saddle #1521 |
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05-08-2019
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#45 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,173
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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
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-08-2019
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#46 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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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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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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05-08-2019
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#47 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,711
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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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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-08-2019
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#48 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,173
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Re: Code 41 = new ECM?
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Module 4 is H41, that is CCM HE has another issue, not ECM related in my opinion..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s 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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1990 Red/Saddle #1521 |
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05-08-2019
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#50 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,173
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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
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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Linear Mode
