Home Register FAQ Members List Calendar Photo Gallery Garage Search Today's Posts Mark Forums Read


Go Back   Third Generation F-Body Message Boards > Tech Boards > Electronics
Reload this Page iroc dual fan issues

Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools
Old 05-07-2009, 09:38 PM   #1
Member
 
1987ZTPI's Avatar
 
Join Date: Feb 2007
Location: SOUTHERN ALBERTA
Posts: 140
Car: 1987 IROC-Z
Engine: 310 lb9
Transmission: SEMI STOCK 700R4
Axle/Gears: 3.45 9 BOLT

Classifieds Rating: (0)
iroc dual fan issues
I just finished welding up my dual exhaust setup and i always dissconect the battery terminals when i weld on my car but when i took it for a drive yesterday and it never goes about 190 degF i have the prom programed to tunr the fan on at 170f but it never came on durning my drive. I have the secondary fan switched so i can turn it on any time, because it's not controled by the ecm. I tested all the relays and wires and the fans work. If i ground the green/white wire at the ecm the fan comes on, also my diagnostic computer says it's turned the fan on but still nothing. I switched the ecm the prom and i also dissconnected the a/c presure switch and it still wont come on. Does anyone have any suggestions? I don't mind running it off off the temp switch on the block but 230deg F is too high for my likeings and this problem is annoying me.
This ad is not displayed to registered members.
Register your free account today and become a member on ThirdGen!
1987ZTPI is offline vBGarage Page   Reply With Quote
Sponsored Links
Registered users do not see this ad.
Click here to register for free!
Old 05-08-2009, 11:27 AM   #2
Senior Member
 
BigBadLou's Avatar
 
Join Date: Jul 2004
Location: Austin, TX
Posts: 2,333
Car: '91 Z28 vert
Engine: 305TPI
Transmission: WC T-5
Axle/Gears: 2.73 posi

Classifieds Rating: (2)
Send a message via AIM to BigBadLou Send a message via Yahoo to BigBadLou
Re: iroc dual fan issues
If you can turn the fan on by grounding the green/white wire on the ECM and the ECM says it's turning the fan on but the fan doesn't run, that logically leaves only one answer: bad ECM connector.

If you disconnect the harness from the ECM and ground pin E8, does the fan come on?

Lou
__________________
'91 Z28 convertible w/305TPI WC T5 (no more auto)
"Nothing screams more of poor craftsmanship than wrinkles in your duct tape!"
BigBadLou is offline vBGarage Page   Reply With Quote
Old 05-08-2009, 12:08 PM   #3
Member
 
1987ZTPI's Avatar
 
Join Date: Feb 2007
Location: SOUTHERN ALBERTA
Posts: 140
Car: 1987 IROC-Z
Engine: 310 lb9
Transmission: SEMI STOCK 700R4
Axle/Gears: 3.45 9 BOLT

Classifieds Rating: (0)
Re: iroc dual fan issues
My diagram with the pinout only lists A 1-12 B1-12 C 1-16 AND B1-16. Theres no E section on the diagram. It's MAF car on an 87' iroc-z. Could you tell me what colour wire E8 is? Also when i ground the diagnotic poort on AB terminal neither fan comes on.
1987ZTPI is offline vBGarage Page   Reply With Quote
Old 05-08-2009, 01:14 PM   #4
Senior Member
 
BigBadLou's Avatar
 
Join Date: Jul 2004
Location: Austin, TX
Posts: 2,333
Car: '91 Z28 vert
Engine: 305TPI
Transmission: WC T-5
Axle/Gears: 2.73 posi

Classifieds Rating: (2)
Send a message via AIM to BigBadLou Send a message via Yahoo to BigBadLou
Re: iroc dual fan issues
The E8 is the green/white wire, the ECM pin that controls the primary fan relay, according to GM. Not sure if they're wrong.
Diagram here: http://www.austinthirdgen.org/mkport...ine_wiring.gif

What diagram are you going by? I'm curious how much they mis/match.

Lou
__________________
'91 Z28 convertible w/305TPI WC T5 (no more auto)
"Nothing screams more of poor craftsmanship than wrinkles in your duct tape!"
BigBadLou is offline vBGarage Page   Reply With Quote
Old 05-08-2009, 01:22 PM   #5
Senior Member
 
BigBadLou's Avatar
 
Join Date: Jul 2004
Location: Austin, TX
Posts: 2,333
Car: '91 Z28 vert
Engine: 305TPI
Transmission: WC T-5
Axle/Gears: 2.73 posi

Classifieds Rating: (2)
Send a message via AIM to BigBadLou Send a message via Yahoo to BigBadLou
Re: iroc dual fan issues
After looking at the diagram closely, it might be wrong (well, go figure ). Which pin did you find the green/white wire on?
I looked at ChevyThunder.com and it seems that the Coolant Fan Relay Control is on C1.

Btw, you mentioned 4 sections in your diagram: A, B, C and B. I believe the last one should be labeled D.

Lou
__________________
'91 Z28 convertible w/305TPI WC T5 (no more auto)
"Nothing screams more of poor craftsmanship than wrinkles in your duct tape!"
BigBadLou is offline vBGarage Page   Reply With Quote
Old 05-08-2009, 01:37 PM   #6
Member
 
1987ZTPI's Avatar
 
Join Date: Feb 2007
Location: SOUTHERN ALBERTA
Posts: 140
Car: 1987 IROC-Z
Engine: 310 lb9
Transmission: SEMI STOCK 700R4
Axle/Gears: 3.45 9 BOLT

Classifieds Rating: (0)
Re: iroc dual fan issues
Ya sorry the last 1 is D, and i believe the green/ white wire is c1. also i just went for a nice drive and i left the ac pressure switch unhooked and the fan kicked on for a few momewnts but then it stopped all together. i'm thinking bad ecm ground or bad ecm connectors
1987ZTPI is offline vBGarage Page   Reply With Quote


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Electronics
Reload this Page iroc dual fan issues
« Thx For all the advise on water issues. U helped but, | External Coil Bracket »

Tags
1987, 87, camaro, coil, diagram, disconnect, dual, duel, ecm, fan, fans, iroc, location, prom, run, time, wire
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 11:42 PM.

Contact Us - ThirdGen.Org - Advertising - Privacy Policy - Terms of Use - Jobs - Top

Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0
All content copyright © 1997 - 2009 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.