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07-19-2020
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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More fun with Fan issues... Different car...
Been running into mutliple issues lately.. Now the fans in my 1991 do not come on even when signaling to turn them on with the Tech one, sometimes they turn on for a split second and off.... Now the odd part, if you go into service/Diagnosis mode it will turn the fans on as it sound.
Temp gauge seems to be working per the tech one..... Cant win I am thinking this is another ECM issue Thoughts?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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07-19-2020
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#2 |
 
Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,239
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Re: More fun with Fan issues... Different car...
Can you check just the fans; maybe they are beginning to fail.
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07-19-2020
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: More fun with Fan issues... Different car...
Did that direct power to fans, and they work....... When I run the diagnostic and it does the ECM check "12" fans come on instantly and are strong.
Gauge fuse is also good
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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07-19-2020
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: More fun with Fan issues... Different car...
Also swapped relays not difference
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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07-19-2020
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#5 | |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: More fun with Fan issues... Different car...
Quote:
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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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07-19-2020
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: More fun with Fan issues... Different car...
Swapped ECMS in the 91 to the 90, in the 90 the Fans work when commanded by the Tech one .. odd.
1991 -fans work with direct power to the fan motor -fans work in Tech one Diagnostic mode.... Testing ECM *so we know relays, wiring, and fans are good -Fans wont command on in the 1991w/th the tech 1 and wont come on at 205 degrees as they should -TEch one command for fan test works on other cars with the same ECM GC how does the sensor shut down the Tech One when its in a fan testing mode?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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07-20-2020
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#7 | |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: More fun with Fan issues... Different car...
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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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07-20-2020
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#8 | |
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Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: More fun with Fan issues... Different car...
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New clue Lee just relating what worked for me.
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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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07-20-2020
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#9 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,193
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Re: More fun with Fan issues... Different car...
Hans
With the TECH 1 there are different tests: Diagnostic Service for when you pull codes: This is when the fans come on and it flashes the SES lights and gives you the code numbers; when I am in this test mode the fans work. That tells me the relays and wiring harnesses/grounds are not the issue Then there is a Misc Test Mode This allows the Tech one to command systems on and off. In this case I was using the fan function and it did not work in the 91...sometimes turning on and off.. in the 90 the ECM worked fine turning on and off w/command (Go to 5:25 in the video) https://www.youtube.com/watch?v=rSrANDurszU
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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07-20-2020
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#10 | |
Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,592
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Re: More fun with Fan issues... Different car...
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Fan 1 comes on at 228 Fan 2 comes on if temp gets to 240 Fan 2 turns off when temp falls to 240 Fan 1 turns off when temp fall below 228. Both fans come on at any temp if AC is turned on. Marty |
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Linear Mode
