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#1 |
Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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Ok. Washed the car the other day and when I started it after it was idling really high about 2000 rpm and didn't have any power. The fan comes on right when I turn the key even before the engine is started. The ccm code on the Speedo says 41 both current and stored, even after clearing. I can got no ECM codes (by grounding A and B) the light in the DIC doesn't even light up. Code 41 means a loss of communication between the ECM and the CCM
My question is will the car still run fine with a good ECM and a bad link between the CCM or is my ECM fubar? |
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#2 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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I would pull BATT neg. then see about re-seating the prom in the ECM.
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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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#3 |
Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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Battery reconnect did nothing. I'll try the prom next
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#4 |
![]() Join Date: Dec 2007
Location: NYC
Posts: 1,186
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Sounds like you wet something.
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90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
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#5 |
Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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Yeah, my pants when I thought of what it'll cost to replace, let alone even finding one!
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#6 |
![]() Join Date: Dec 2007
Location: NYC
Posts: 1,186
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__________________
90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
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#7 |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Worst case Haibeck can have it rebuilt. I seriously doubt that’s the issue though. Did you wash the engine? In this case its more likely a connector somewhere.
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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. Last edited by Ccmano; 04-30-2019 at 11:07 AM. |
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#8 |
![]() Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,154
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reseat the connectors on the ECM, there was someone here who had that issue with bad pin connection to the ECM..
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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#9 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Sometimes its just a matter of a bit of corrosion that needs some removal.
__________________
[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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#10 |
Join Date: May 2018
Location: Nanaimo BC
Posts: 61
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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? |
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