values for R6 and R7 resistors? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MSPNP MSPNP specific Megasquirt related discussion.

Reply
 
 
 
LinkBack Thread Tools
Old 06-01-2014, 03:37 PM   #1
Junior Member
Thread Starter
 
Join Date: Jul 2005
Location: Hillsborough, NC
Posts: 273
Total Cats: 0
Default values for R6 and R7 resistors?

Hey guys,

Does anyone know the values of the TPS resistors on the MSPnP daughtercard (90-93 ECU)?

I'm helping someone install a secondhand MSPnP, and it looks like the ECU was originally wired up for a variable TPS, so R6 and R7 are missing. But the car won't start as it's wired up, so I need to install those resistors (he has the original TPS).

Thanks in advance!
Justin
JustinHoMi is offline   Reply With Quote
Old 06-02-2014, 12:25 PM   #2
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,266
Total Cats: 51
Default

This is a Gen 1, right? If so, they were both 10K.
Matt Cramer is offline   Reply With Quote
Old 06-02-2014, 12:31 PM   #3
Junior Member
Thread Starter
 
Join Date: Jul 2005
Location: Hillsborough, NC
Posts: 273
Total Cats: 0
Default

Yeah, it is. Thanks!
JustinHoMi is offline   Reply With Quote
Old 06-02-2014, 12:57 PM   #4
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Quote:
Originally Posted by JustinHoMi View Post
Hey guys,

Does anyone know the values of the TPS resistors on the MSPnP daughtercard (90-93 ECU)?

I'm helping someone install a secondhand MSPnP, and it looks like the ECU was originally wired up for a variable TPS, so R6 and R7 are missing. But the car won't start as it's wired up, so I need to install those resistors (he has the original TPS).

Thanks in advance!
Justin
It's probably not the resistors; it's probably the jumper wires.

Test by simply unplugging the TPS and see if the car starts.
Ben is offline   Reply With Quote
Old 06-02-2014, 01:53 PM   #5
Junior Member
Thread Starter
 
Join Date: Jul 2005
Location: Hillsborough, NC
Posts: 273
Total Cats: 0
Default

Yeah, you're right. We unplugged the TPS yesterday and the car started up, so I ended up just removing the jumpers and all was well. What are the resistors for? Just trying to decide whether it's worth putting them in or not.

Justin
JustinHoMi is offline   Reply With Quote
Old 06-02-2014, 08:10 PM   #6
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

The resistors stabilize the TPS reading because nothing is hooked up to the TPS input pin on the ECU. If you spend a lot of time with key on, engine off, eventually the TPS reading in the ECU will eventually creep up beyond the flood clear threshold, which will result in no-start if you crank. This can be fixed by power cycling the key. Or you can install the resistors. Or you can install a TPS.
Ben is offline   Reply With Quote
Old 06-16-2014, 02:17 PM   #7
Newb
 
Join Date: Jun 2014
Posts: 1
Total Cats: 0
Default

Hi Ben, thank a lot for this information. I am just wondering about the TPS that why the TPS reading creep up beyond the flood clear threshold because its input is not connected to anywhere or there is some another reason? If the unconnected input is the reason then what is the logic behind it?

electronic pcb assembly

Last edited by pilav; 06-26-2014 at 12:20 PM.
pilav is offline   Reply With Quote
Old 06-16-2014, 09:36 PM   #8
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Quote:
Originally Posted by pilav View Post
Hi Ben, thank a lot for this information. I am just wondering about the TPS that why the TPS reading creep up beyond the flood clear threshold because its input is not connected to anywhere or there is some another reason? If the unconnected input is the reason then what is the logic behind it?
It's the nature of the hardware filtering when the signal input is floating.
Ben is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
MS2e Thermistor Calibration [email protected] MEGAsquirt 6 06-14-2014 11:28 PM
GM Coolant Sensor Calibration Issues? jnshk MEGAsquirt 0 03-29-2013 08:48 PM
Adding an oil pressure gauge in TS WestfieldMX5 MEGAsquirt 0 01-08-2012 07:54 AM
Improved Spark out, bias resistor value 01-05 clt samwu8k MEGAsquirt 1 09-23-2011 07:21 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 07:05 PM.