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04-16-2010
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#11 |
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Re: SYS light,,
I know that I would not run out and buy a new battery just yet.
I'd check the battery connections first. Then I'd give it a good charge.
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Scott  Vett owner since 1979._It's about the car and the people |
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04-16-2010
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#12 |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: SYS light,,
Last time I saw a SYS light the INST fuse was blown. Replaced fuse SYS went away.
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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04-17-2010
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#13 |
 Join Date: Dec 2007
Location: Bloomingdale, Il
Posts: 330
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Re: SYS light,,
Had limited time this evening. Found out that the SES light doesnt work at all. Pulled codes an got a C41. Battery held 12.6 volts all day so battery is good. Will do more looking in the morning.
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04-17-2010
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#14 |
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: SYS light,,
according to my 90's FSM a 41 = wrong or bad MEMCAL.
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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04-17-2010
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#15 |
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Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: SYS light,,
I think MEMCAL is FSM-speak for "chip" or EPROM or PROM ( not the senior prom either
 )
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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04-17-2010
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#16 |
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Join Date: Dec 2007
Location: Bloomingdale, Il
Posts: 330
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Re: SYS light,,
It was a C41 code read from grounding the G & A terminals and displayed on the speedo not the SES light is that still the correct reading? I have a FSM but am having a hard time finding the codes in it ...
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04-17-2010
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#17 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: SYS light,,
Quote:
EBCM (ABS ECM) AC controller and Radio also connect tot he Serial line
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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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04-17-2010
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#18 |
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Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: SYS light,,
Sorry, my bad
 I've never been in the 8D section of my FSM. You should see how clean the pages are. Your page is 8D-47, near the back of the thick book that has "Service Manual" on the cover. It's not the supplement LT5 book or the Electrical Book. I do not have a scanner on my P/C so I can't send you the pages. The opening step of the diagnostic chart is not very involved. I can write it in a post if need be?  Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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04-17-2010
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#19 |
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Join Date: Dec 2007
Location: Bloomingdale, Il
Posts: 330
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Re: SYS light,,
Okay this morning I removed the stereo head unit that was repaired this winter and the sys light is gone. -=jeff=- is going to borrow me a spare and see if that is the problem.
Also am going to try a different ECM to see if that helps the SES light issue. |
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04-18-2010
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#20 |
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Join Date: Dec 2007
Location: Bloomingdale, Il
Posts: 330
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Re: SYS light,,
okay got the ccm out this morning, checked data link wire. Have signal between aldl ,ccm, heat /ac controler and brack ecm. no signal at ecm, Going to check for open or ground next
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