I have a VSS (2 pulse Square Wave DC 2000 ppm) that is connected to the output of the T5 transmission. It has a two cables and I have connected one at the A10 of the ECM and the other to general earth.
After doing some data log with DataMaster I see after 41 seconds that I get a code VSS fail code 24.
My question is:
Is it possible that due to an oil leak that the sensor has been destroy?
Doe I need to switch the cables? (Original unmarked cables)

Installed on a '87 305 TPI engine.

Regards,
Cobra289

 

An other one picture.

 

And an other one.

 

Hmm, I kinda doubt the sensor is bad because of an oil leak. You're working with a VSS that I've never used before. I'm sorry I can't help.

 

Hi S10Wildside,
Some one here in Holland has helped me with tool air and blows all the possible oil.
After that we have check with a digital meter and it works.
I am very happy with that.
The thinks that I am lucky that the sensor has not transform the oil to grease.
Thanks for your help. I hope that it goes well with your harness job.
Regards,
Cobra289

 

Look here:

http://www.cruzers.com/~ludis/1227165schematic.html

under inputs at the bottom is the VSS schematic. Basicly what happens is the sensor provided a ground and the ign voltage in taken across the 5100 ohm resistor. The op amp is fed 0 V across the 100K resistor. When the sensor takes the ground away the ign voltage moves across the resistors (with no current flow) and the op amp is fed 12 V. What this means is that the VSS is simply a switch. To check it check for continuity. Turn 1/4 turn and look for change in continuity. A good one will be on then off then on then off. It also does not matter which wire goes to the comp and which goes to ground.

HTH

John

 

Hi John,
Our post has just crossing for a minute.
Some one here in Holland told mi today just what you explain.
I did the test for continuity and it works, after blowing all the oil from inside.
Thanks for pointing to the diagram.
I was thinking in a DRAC buffer etc. but today I am lucky.
Thanks for your input.
Regards,
Cobra289

 

Hi John,
My level of electronics is very low and it difficult to understand the schematic but let me learn something today.
My understanding from your explanation and schematic is:
The sensor is located at the left side of the Schematic VSS# {5}.
The VIGN provide the 12v via the 5.1K ohms.
The Op-Amp is connected to the VIGN via the 5.1K and the 100K.

But what does the two circles at the sensor input (one is connected and the other in parallel is open?
At the bottom part I see the earth symbol, with a condensator?

I have expected an earth symbol at the sensor.
Sorry for my ignorance.
Regards,
Cobra289

 

Not 100% sure what the circles are. If I had to guess I would think they are places where the trace is broken so that a jumper or component could be placed there. The input appears to be jumpered.

HTH

John

 

That makes sense.
I thought something special in electronics world.
Thanks
Cobra289