Notices

Where does the ECU pick up the vehicle speed feed?

Thread Tools
 
Search this Thread
 
Old 02 February 2007, 08:34 PM
  #1  
gatecrasher3
Scooby Regular
Thread Starter
 
gatecrasher3's Avatar
 
Join Date: Jul 2005
Location: Sheffield
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Default Where does the ECU pick up the vehicle speed feed?

I am having an intermittant fault with the speedo not giving a reading on MY95 WRX and noticed that when the speedo isn't working I get no speed reading on the PFC hand controller either.

Does that mean that the speedo clock has an electrical output to the ECU?

Also I am hoping that the problem is simply the speedo cable being loose or something equally as minor. I am assuming that the KMH to MPH convertor is attached to the back of the clocks? Do they have a tendancy to break down at all?
Old 02 February 2007, 08:42 PM
  #2  
ticky
Scooby Senior
 
ticky's Avatar
 
Join Date: Feb 2003
Location: West Midlands
Posts: 1,903
Likes: 0
Received 0 Likes on 0 Posts
Default

Does that mean that the speedo clock has an electrical output to the ECU?

Yes it does.

I am assuming that the KMH to MPH convertor is attached to the back of the clocks? Do they have a tendancy to break down at all?

Depends which type of convertor you have, some are at the back of the speedo & others usually inbetween the 2 speedo cables.

Common faults tend to be loose speedo cable (missing spring type clip) or even damaged inner cable/spindle

Ticky
Old 02 February 2007, 10:06 PM
  #3  
gatecrasher3
Scooby Regular
Thread Starter
 
gatecrasher3's Avatar
 
Join Date: Jul 2005
Location: Sheffield
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks for your reply. There are two speedo cables , is this assuming that the convertor is inline with the original cable thus splitting it in two?
Old 02 February 2007, 11:31 PM
  #4  
ticky
Scooby Senior
 
ticky's Avatar
 
Join Date: Feb 2003
Location: West Midlands
Posts: 1,903
Likes: 0
Received 0 Likes on 0 Posts
Default

Well there is 1 long cable from the back of the speedo clock which fits into the short cable (push in fit & held in place with a clip)
The short cable with a threaded end fits into the gearbox .
Normally the convertor fits between the 2 cables.

Last edited by ticky; 03 February 2007 at 10:08 AM.
Old 03 February 2007, 08:25 AM
  #5  
gatecrasher3
Scooby Regular
Thread Starter
 
gatecrasher3's Avatar
 
Join Date: Jul 2005
Location: Sheffield
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Default

Nice one. That gives somewhere to start looking today.

Thanks again
Old 03 February 2007, 09:19 AM
  #6  
flat4
\m/ ^_^ \m/
 
flat4's Avatar
 
Join Date: Dec 2001
Location: 2010 Time Attack Club Pro Champion - Powered by ScoobyClinic
Posts: 36,816
Likes: 0
Received 0 Likes on 0 Posts
Default

On mine the converter is located on the cable running off the gearbox under the turbo pretty close to where the cable attaches to the gearbox. Mine stopped working due to the grease seizing up in the converter itself (common problem apparently) i just stripped it down and put new grease in.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JimBowen
ICE
5
02 July 2023 01:54 PM
shorty87
Subaru Parts
1
07 October 2015 11:52 AM
M4RKG
General Technical
3
30 September 2015 07:51 PM
speedrick
Subaru Parts
0
26 September 2015 03:01 PM
shorty87
Other Marques
0
25 September 2015 08:52 PM



Quick Reply: Where does the ECU pick up the vehicle speed feed?



All times are GMT +1. The time now is 07:34 PM.