funky wiring, speed sensors, etc - Defender Source
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  #1  
Old August 12th, 2013, 01:27 PM
CaptMidnite
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Daniel Choi
94 NAS Defender 90 ST
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funky wiring, speed sensors, etc

Previously owned a '95 ST.

Sorting out my 1994 ST NAS D90 which I bought from a local LR dealer a month ago. They claimed it went through a multi-point inspection and to have done over 4k-5k of refurbishing (new tie rods, blower, swivel seals, etc), and the truck shows evidence of such work. But oddly enough, when I emptied the crankcase only about 3.3 quarts of oil came out (half capacity). The truck sat on the dealer lot for 4 months so maybe since the last oil change it got burned or leaked out.


I've been pulling out a lot of extra wiring put in by previous owners for aux lights, stereo etc. Found the remains of some animal's nesting material behind the lower driver's side dash panel. The truck runs fine but I'm still sorting out the funky wiring job, especially this one:

1) The original mechanical speedo was replaced with a digital VDO speedometer (calibrated to correct mileage) by previous owner.
2) In the process, the gearbox speed sensor was replaced with YBE 100540. This sensor runs 2 electric wires directly to the speedo. No more mechanical linkage to the speedometer.
3) The 2 wire ends running into YBE 100540 were both wrapped in electrical tape (to add thickness) and simply plugged into the sensor female end by previous owner. Spent this morning at a u-pull yard it finding the correct male plug from a Discovery I. Cost me $5.00. Going to splice in this plug. Also, the speedometer/sensor wiring was installed with no protective sheathing by previous owner- so, going to fix that too.
4) The stock VSS unit (different from the gearbox sensor, mounts on frame rail) sits there with the mechanical speedometer cables hanging. I think the VSS is still connected to the ECU.
5) At the dealer during the test drive the ECU threw out a check engine (“speed sensor error”) code, but otherwise it hasn't come on and truck runs fine.
6) My question (which I'll eventually try to figure out by tracing wires): So is the truck possibly running now without sending vehicle speed info to the computer? Can this be done without causing engine error codes to pop out? Maybe the digital VDO speedometer is sending a signal to the ECU?
7) Owning a Defender has been a lesson in auto mechanics (a good thing!).
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  #2  
Old August 12th, 2013, 02:08 PM
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Scott
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  #3  
Old August 12th, 2013, 02:08 PM
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Sorry, can't help much, but can we see pics of the D90? Which number is it?

I think leastonce did the speed sensor a while back, and I may have a pic or two of it opened up. Not sure that'll help though.
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  #4  
Old August 12th, 2013, 02:18 PM
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John
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I had a VSS go bad on my 96 D1, it made the cpu think it was over speeding and cut fuel, un-plugged it and it ran fine for the rest of the trip 1000 miles. Used the gps & tacho for speed.

I caught the over-speed on the scan gauge that's fitted, would go up to 129mph and start cutting out.
This is the bolt-on to the transfer box type VSS

Not sure if this helps
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  #5  
Old August 12th, 2013, 02:31 PM
CaptMidnite
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Daniel Choi
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Reply to Rijosho

Rijosho: Ah, are you saying you (or your shop) worked on this Landy before? It's #828 Conniston Green ST (a repainted Portofino red). CarFax shows it was a New Hampshire/Massachusets car.

Pic #1: Gearbox sensor wiring (in yellow). Bottom edge of pic shows electric tape. Will fix with connector. Note the exposed wiring.
Pic #2: Wiring coupler for frame mounted sensor. Two wires yellow and green, red wire is cut and doesn't run to anything.


Truck running fine so far. Since the mechanical cables aren't connected. I'm guessing the VSS is receiving no input, but still wired to the ECU. Gearbox sensor wiring runs to the digital VDO speedometer.

Roverman2010: Seems like there are two VSS's. One is the gearbox guy, the other is mounted on the frame. Normally on 95 and 94's the gearbox VSS uses a mechanical cable to send output to frame VSS. Frame VSS sends another cable to mechanical speedo AND electrical wiring to ECU. Wondering if my ECU is receiving signal from frame VSS. Thanks everyone!!!
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  #6  
Old August 12th, 2013, 02:40 PM
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'94 should still be 14 CUX engine computer, which doesn't really give a rat's you-know-what about the VSS except for curiosity's sake. Ditto the air con sensor, the fuel temp sensor and a few others.
It cares about the volume of air coming into the engine. Anything else, meh.
It will run.
Hate those blue splice shiz things.
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Old August 12th, 2013, 02:49 PM
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Daniel Choi
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Thanks...

"'94 should still be 14 CUX engine computer, which doesn't really give a rat's you-know-what about the VSS except for curiosity's sake"

Ahh, I see. Thanks. The cruder the better. What a relief from cars nowadays with iDrive, Bluetooth connectivity, satellite, 10-airbags, traction control
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Old August 12th, 2013, 02:50 PM
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No I was just saying I wanted to see a pic of the truck you bought.

Also that Jason - leastonce here - had worked on this on his truck a few months ago and I had some pics.
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  #9  
Old August 12th, 2013, 02:54 PM
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Daniel Choi
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There she is . . .

Took off rear roll bar cage already. Canvas top rolled up bimini style.
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  #10  
Old August 12th, 2013, 03:07 PM
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Quote:
Originally Posted by CaptMidnite View Post
It's #828 Conniston Green ST (a repainted Portofino red). CarFax shows it was a New Hampshire/Massachusets car.
Oh, OK. That's the truck that was for sale here back in November for $15k. You may be able to get some additional details on that truck from the previous owner:

http://www.defendersource.com/forum/...ad.php?t=41404
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  #11  
Old August 12th, 2013, 03:15 PM
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Daniel Choi
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Thanks Rijosho . . .!

Thanks, what an interesting find.
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  #12  
Old August 12th, 2013, 03:21 PM
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Jason England
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Quote:
Originally Posted by o2batsea View Post
'94 should still be 14 CUX engine computer, which doesn't really give a rat's you-know-what about the VSS except for curiosity's sake. Ditto the air con sensor, the fuel temp sensor and a few others.
It cares about the volume of air coming into the engine. Anything else, meh.
It will run.
Hate those blue splice shiz things.
Not true the ECU does care about VSS input as this tells the ECU to prepare to idle when the truck is slowing down ... if it's not connected it will throw a VSS code.

It's not clear - is the VDO speedo is actually working?

To wire up the YBE 100540 to feed the ECU and the VDO you need to insert a 120 ohm resistor in series to limit the current flow ... otherwise the ECU output will fry the YBE ...

I'll try and create a diagram at some point but PM if you want to discuss.
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  #13  
Old August 12th, 2013, 04:02 PM
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Daniel Choi
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"is the VDO speedo actually working?"

Yes, the YBE 100540 is connected directly to it with the two wires. No other connection from the YBE to anywhere else. Speedometer works from this input.
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  #14  
Old August 13th, 2013, 08:11 PM
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On the 14CUX at pin #6 you have a yellow road speed input wire. On the newer electronic spedo, say Td5, the speed input to the ECU comes out of the spedo. As mentioned above this puts the proper resistance on the wire going into the ECU.
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