MS\\ fans and AC issue - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 08-19-2010, 09:44 PM   #1
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Sep 2008
Location: ON
Posts: 523
Total Cats: 2
Default MS\\ fans and AC issue

I was trying to get my AC working and after confirming all oem sensors were working and the system is charged I set about trying to figure it out.

I went through my ms adapter wiring harness and found the black wire brain puts in to join the two pins after the diode (sorry for my un-technical explanation) was off one of the pins. I reattached it and nada, although since the fan trigger wire came off I could control the fans with the ac switch. Also the diode has no resistance and the plastic of the receptacle behind it is brown from heat (soldering I hope).

I then thinking the relays were the problem jumpered the relays (as per the pathway diagram on them), that did nothing but when they were put back my fans don't work.

They will work fine if the afore mentioned little black wire goes from the closest "ac pin" to the regular fan pins to another harness ground but don't seem to work without this. Even using the ac button now doesn't start them. Their relay is fine and no blown fuses.

Ideas?

inferno94 is offline   Reply With Quote
Old 08-20-2010, 10:27 AM   #2
Newb
 
Join Date: Aug 2010
Posts: 37
Total Cats: 0
Default

I just finished this circuit. Are you using an MS2? I assume you pulled the stock ECU out and are doing a standalong configuration. Did you enable the output in tunerstudio?

If you want to test the fans operation, open your diagnostics connector and jump TFA and GND.
heychris is offline   Reply With Quote
Old 08-20-2010, 09:33 PM   #3
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Sep 2008
Location: ON
Posts: 523
Total Cats: 2
Default

I'm on ms1 and I know the fans work, with the factory ecu the cycle properly. Until yesterday I had been driving the car standalone with proper fan function.

I get continuity through the entire compressor path (from the switch to the ecu) except I get no voltage at the input (GRN/RED wire) of the under dash temp sensor (first step after the diode after the ac light).

I didn't mention that I had found a burned up pin in the connector by the ac relays. The only burned pin was the constant hot (blue/ yellow) and I had already bypassed the connector.

Anyways my fans don't work with MS unless I attach the end of the black ac jumper wire to a pin within 3 spaces of the fp wire, although my MT says it's properly cycling the fan output.

My harness is wired as the above diagram shows and it all works properly (except sending power from the ac switch to the ac temp sensor) with the factory ecu.
inferno94 is offline   Reply With Quote
Old 08-20-2010, 11:21 PM   #4
Newb
 
Join Date: Aug 2010
Posts: 37
Total Cats: 0
Default

burned pin. hmm.. When you test the voltage out the ms harness do you get anything? Maybe the transistor that drives it is blown out. Did you run a separate transistor or do it off the middle LED's?
heychris is offline   Reply With Quote
Old 08-21-2010, 12:29 AM   #5
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Sep 2008
Location: ON
Posts: 523
Total Cats: 2
Default

The MS was built by braineack and it uses the middle led to indicate fan on.
inferno94 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Bizarre connection issue? nick470 MEGAsquirt 1 09-30-2015 11:32 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM


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



All times are GMT -4. The time now is 04:03 PM.