MS1 + Fuel pump Question - 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 08-28-2011, 11:38 AM   #1
I'm a terrible person
Thread Starter
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default MS1 + Fuel pump Question

I'm working on my harness and I have a question regarding the F/P circuit.

I see from here.... http://www.boostedmiata.com/MS/9697_...ne_harness.jpg
..that the MS uses 4T (Y/R) for the fuel pump. According to my diagram 4T goes directly to the Purge Solenoid Valve (looks like a ground). How does this have anything to do with the fuel pump?
Fuel pump relay has 4 inputs:

LG: to ECU (assuming a ground)
L/R: to Fuel pump
W/R: Power from Main Relay
W/R: Power from Main Relay

LG is not used at all with the MS. Since the LG and W/R form the circuit to "pull" the relay shut, it won't function without both obviously.

Without looking at the MS I'm assuming 4T, is jumpered to 1U (LG). But why not just use 1U to begin with? Is it just how the MS is designed?

It's early so this might not make sense. Or the answer may be obvious, but either way I'm confused.
FRT_Fun is offline   Reply With Quote
Old 08-28-2011, 01:53 PM   #2
Senior Member
iTrader: (2)
 
Join Date: Sep 2008
Location: ON
Posts: 523
Total Cats: 2
Default

I think you're running into the issue I had to correct with my harness.



That's the updated, ie correct, 96/97 diagram.
Attached Thumbnails
MS1 + Fuel pump Question-9697_standalone_harness.jpg  
inferno94 is offline   Reply With Quote
Old 08-28-2011, 06:07 PM   #3
I'm a terrible person
Thread Starter
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

Oh man that one is so much better. So this makes sense.

This makes me feel better.
FRT_Fun 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 57 07-19-2017 05:11 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


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 10:17 PM.