L Series Speed Sensor

jzk25 · Post by **jzk25** » Thu Jul 20, 2006 8:27 pm

[quote=""SCOOBIDOO"] the speed sensor is not a signal generater,it is a negative triggering reed switch which is actuated by a magnet on the speedometer bell,your just guessing at this stage, there is no 12v to this reed switch ........[/quote]

Care to clear this up for us SCOOOBIDOOO?

stamp_licker · Post by **stamp_licker** » Thu Jul 20, 2006 8:33 pm

so at the end of the day if you already have a efi L can you just locate the wire that goes to the L ecu and splice in the speed sensor wire from the ej loom?

wagonist · Post by **wagonist** » Thu Jul 20, 2006 8:56 pm

the_postie wrote:so at the end of the day if you already have a efi L can you just locate the wire that goes to the L ecu and splice in the speed sensor wire from the ej loom?

Absolutely, though from all the tacho clusters I've seen, I've you got a L with tacho, then the signal is already there, just needs to be tapped into.
On the back of the cluster, there's 2 spots for screws through the circuit board between the speedo drive & the centre display.
If you put a screw through the one that doesn't have a label 100k, then trace that circuit to where it comes out on the big multipin plug, you now have a signal for the ECU.

Matt · Post by **Matt** » Sun Jul 23, 2006 2:56 pm

What kind of trigger rate do you need for the reed switch? or doesn't it matter only a constant rate?

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Sun Jul 23, 2006 4:01 pm

The rate of signal frequency depends on vehicle speed.

Matt · Post by **Matt** » Sun Jul 23, 2006 7:39 pm

Sorry poor question on my behalf, what i was getting at is there a certain rate at which it has to send to the cruise control like 5 cycles a second, etc. But after thinking about it there can't be.

vincentvega · Post by **vincentvega** » Mon Jul 24, 2006 1:34 pm

has anyone actually compared the output of a L speedo and a lib speedo to see if they are the same?

Postie we can measure the output of your L speedo and the output of my lib speedo and compare if you want (alot easier to do now while your cars still running!)

PeeJay · Post by **PeeJay** » Mon Jul 24, 2006 6:59 pm

Next time I'm at Pick'n pay less I'll bring the hammer and count the slots in the encoder wheels

SCOOBIDOO · Post by **SCOOBIDOO** » Tue Jul 25, 2006 7:12 pm

BIG DEAL..anyone can send a schematic of a photo diode triggered distributer circuit, i am yet to see a photo diode trigger for the l serie,s speed sensor...anyone have the photo,s to prove it? i have many speedo,s including 2 3 d od auto centre cluster ones and they all run reed,s except for stock dash,s..they have no speed sensor.....just the universal circuit board to save cost,s on retooling for a alternate wafer..just like the speed sensor..all on 1 platform..i dont see anyone showing real proof..only stale claims..
i love this I.D your all tech guru,s when it comes to newbie,s but i know who you are aha and to all that know there stuff...there,s more than this....
my original i.d is ----- ...lolololoololololol..as if ide spoil all my fun with you sock %&$#ers

PeeJay · Post by **PeeJay** » Tue Jul 25, 2006 10:21 pm

Nothing to do with the distributer

jzk25 · Post by **jzk25** » Sun Aug 06, 2006 8:03 pm

SCOOBIDOO wrote:i love this I.D your all tech guru,s when it comes to newbie,s but i know who you are aha and to all that know there stuff...there,s more than this....
my original i.d is tosser ...lolololoololololol..as if ide spoil all my fun with you sock %&$#ers

When you have finished reading Electronics for Beginners can you grab a copy of "Grammar and Puncuation for Simpletons" so people that have been to school can understand what little you have to say.

Why TF would you want to post under a different name when you are already a respected tech guru on AUSubaru.

steptoe · Post by **steptoe** » Thu Jun 28, 2007 2:14 pm

Not wanting to dredge up the insults that flew around in here 12 months ago but it is the best place to say my bit.Factory workshop manual for 86 model says/shows an NPN type transistor and it is in the meter. Looking at the speedo head of early EA82T and one of late EA82 carby auto, they both have a soldered in something in the speedo head with terminals much like what someone above has described. Not see any optical interupter in my stuff, maybe that was intermediate or imported stuff. Sort of making sense that if these solder joints are for the speed sensor and they are so incorporated into each speedo, just maybe they do all have this component built in , not connected to board or loom if not needed. OR is this something else in the speedo head ?? it is a mechanical speedo as opposed to electronic, so not expect to see solder joints !

my unqualified 2c worth anyway

wagonist · Post by **wagonist** » Thu Jun 28, 2007 4:45 pm

A lot of the one's I've seen have the part in the sppedo, & have the track on the board, but not the screw that joins the 2 together (this is on the clusters with tachos, I can't comment about the non tacho ones).

There are 2 holes in the circuit board between the speedo & the central display.
One of them is for the JDM 100km/h chime & is labelled "100k", the other is for the speed sensor (I think its labelled with a zigzag line)

steptoe · Post by **steptoe** » Thu Jun 28, 2007 11:31 pm

zigzag line ? that's Nipponese for speed sensor !

100k is kph then, I thought it was resistor value or sumptin' . Huh.

I should point out both mine are tacho equipped. The auto carby one also has a blue clip in section of bits soldered to the board at the top ,with three biggish capactors, a little green one and a coupla diodes with an IC? watziz ?

wagonist · Post by **wagonist** » Fri Jun 29, 2007 4:37 pm

where abouts on the board is this group? On the upper part or lower?

steptoe · Post by **steptoe** » Sun Jul 01, 2007 6:26 pm

it is on the speedo side at the top. the two square holes? they have a housing clip in here, stuff visible on the inside and connects the the row above and below , each of 5 solder holes

steptoe · Post by **steptoe** » Tue Jul 24, 2007 11:13 pm

OK. what a fiddly job it is to get the instrument cluster out !! Got in there to clean the perspex with Brasso and inspect the speed sensor and what do you know ?? It is just the same inside as my other speedos out of differing L's. The speed sensor appears to be built in to all these speedo heads, with a few links made in the PC board to connect to the pin best represented by 5 O'clock position when looking at the back upright. Someone else mentions a reed switch set up inside, it may have been different year model or non factory. Curiosity satisfied and the dash is back together

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L Series Speed Sensor

photo sensitive diode, trigger circuit