Strange PNP harness issue -> Flooding with TPS wires connected - 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 03-02-2010, 02:31 AM   #1
Elite Member
Thread Starter
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default Strange PNP harness issue -> Flooding with TPS wires connected

I noticed this when building a harness for another member here. I do not have a VTPS on my car currently (although I may in the near future). However, my stock 1.6 tps is still plugged in.

The issue is, if I have the 5vref wire connected between the MS and the car's harness, my car will flood and refuse to start, necessitating removing the plugs and drying out the cylinders. At first I thought that perhaps the car was seeing a full 5v, but the TPS sig wire is completely disconnected (after trial and error)... I can try to get a log tomorrow, but does anyone have any ideas off the top of their head as to why this is happening? I don't want to mail someone a harness that could be potentially damaging to their car, but I also don't want to give them a not so PNP harness when that isn't what I promised.
Jeff_Ciesielski is offline   Reply With Quote
Old 03-02-2010, 09:35 AM   #2
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Athens GA
Posts: 434
Total Cats: 3
Default

What year and model os the harness for? Which connector wiring guide did you follow?
Is the MS shutting down if you have the +5 vref connected to the harness?
I had a issues in making the tps sensor (automatic) working on my car. I finally realised that the 90-93 ecu connector diagram in the FAQ was showing the wrong pin for +5V and that it should be connected as in the 94-95 model.

-Raj
redrider706 is offline   Reply With Quote
Old 03-02-2010, 10:54 AM   #3
Elite Member
Thread Starter
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default

I followed Brain's wiring guides in the FAQ. I'm building the harness for a 90-93.
Jeff_Ciesielski is offline   Reply With Quote
Old 03-02-2010, 11:08 AM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

unplug the TPS connector. I keep forgetting to add that disclaimer.
Braineack is offline   Reply With Quote
Old 03-02-2010, 11:17 AM   #5
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,266
Total Cats: 51
Default

Yep, connecting the VREF to the stock on/off TPS will usually make everything shut down at best.
Matt Cramer is offline   Reply With Quote
Old 03-02-2010, 11:33 AM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

it locks the injectors open the way I wire the harness. I setup the harnesses to easily upgrade to the wells TPS. They are in my installation instructions I provide to people I assemble units for, but I keep forgetting to add it to my "how-to" here.
Braineack is offline   Reply With Quote
Old 03-02-2010, 11:33 AM   #7
Elite Member
iTrader: (9)
 
Join Date: Sep 2008
Location: Livonia, Michigan
Posts: 5,684
Total Cats: 10
Default

Quote:
Originally Posted by Braineack View Post
unplug the TPS connector. I keep forgetting to add that disclaimer.
Big time!! lol. It happened to me when I had my 91. Just unpluged the TPS cables at the throtle body. Also I have a bosch TPS that I had bought for my previous project $40 shipped if anyone wants it.
buffon01 is offline   Reply With Quote
Old 03-02-2010, 11:43 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

You're excuse is only that you didn't read my writeup!
Braineack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
MSPNPPro-MM0105: Coolant Temperature Output slomiata MEGAsquirt 5 10-07-2015 02:11 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 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 04:41 PM.