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Why would my VSS be cut?

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Old Oct 27, 2014 | 09:47 PM
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Default Need your help! Why would my VSS be cut?

I bought a modified C5 Z06 about three months ago. I've discovered the VSS was cut, and the connector was left in place.

What purpose does this serve? Is this an oversight on the previous owner's part? Or is there a mod where this is beneficial?

Also, I need your help to determine which color wire was connected to port A and port B of the PED 34 connector! (also delphi PT191)

Last edited by wolf8218; Oct 27, 2014 at 09:58 PM. Reason: Title edit
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Old Oct 28, 2014 | 06:17 AM
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Originally Posted by wolf8218
I bought a modified C5 Z06 about three months ago. I've discovered the VSS was cut, and the connector was left in place.

What purpose does this serve? Is this an oversight on the previous owner's part? Or is there a mod where this is beneficial?

Also, I need your help to determine which color wire was connected to port A and port B of the PED 34 connector! (also delphi PT191)
Salvage / junk yards cut harnesses as they disassemble cars. Quicker than messing w/ the connectors. You may have a used unit, but why wasn't VSS hooked up?

No FSM now on the pin sorry.
Mark
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Old Oct 28, 2014 | 10:13 AM
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Originally Posted by cvm
Salvage / junk yards cut harnesses as they disassemble cars. Quicker than messing w/ the connectors. You may have a used unit, but why wasn't VSS hooked up?

No FSM now on the pin sorry.
Mark
This makes no sense. The VSS was the only one cut and arguably the easiest connection to pull. It's not like these harnesses are hard to get to.

I got the pins on the Speed Signal High and Speed Signal Low (400, 401).

This is puzzling me. It was a clean cut, even on both wires, too, so I know the connector wasn't simply pulled off during diff removal.
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Old Oct 28, 2014 | 04:49 PM
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I am ignorant here - what is a VSS, and what does it do?
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Old Oct 28, 2014 | 05:05 PM
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Originally Posted by jackthelad
I am ignorant here - what is a VSS, and what does it do?
Vehicle Speed Sensor. Senses differential revolutions.
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Old Oct 28, 2014 | 05:09 PM
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Maybe he was tired of his wife telling him to slow down.
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Old Oct 28, 2014 | 05:20 PM
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By disconnecting it, would it stop the odometer from logging miles?
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Old Oct 28, 2014 | 05:31 PM
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Speedometer works, odometer works.
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Old Oct 28, 2014 | 05:51 PM
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Originally Posted by wolf8218
Speedometer works, odometer works.
Then it's not the VSS that is cut. Maybe you're looking at the shift-skip solenoid?
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Old Oct 28, 2014 | 07:42 PM
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I know some after market stereos required VSS signal for GPS to work correctly. Maybe they tapped into the wires? Just a thought.
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Old Oct 29, 2014 | 09:26 AM
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Originally Posted by lionelhutz
Then it's not the VSS that is cut. Maybe you're looking at the shift-skip solenoid?
Definitely the VSS that is cut. Unless this is not the VSS.


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Old Oct 29, 2014 | 09:57 AM
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You need to figure out how the speedometer and odometer is working then.
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Old Oct 29, 2014 | 11:06 AM
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Originally Posted by lionelhutz
You need to figure out how the speedometer and odometer is working then.
Keying off the wheel-speed sensors of the ABS? That's how my Boxster worked.
I'll take a look in the FSM later if nobody comes up with a better explanation.
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Old Oct 29, 2014 | 11:13 AM
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A lot of after market head units use that wire for mileage and such.
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Old Oct 29, 2014 | 02:16 PM
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The connector was completely cut and not connected to any head unit wiring.
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Old Oct 29, 2014 | 02:32 PM
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Originally Posted by wolf8218
Also, I need your help to determine which color wire was connected to port A and port B of the PED 34 connector! (also delphi PT191)
"A" (signal low, 401) is purple, "B" (signal high, 400) is yellow.
At the PCM end of those two circuits, same color, pins 20/21 of connector C2.
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Old Oct 29, 2014 | 08:55 PM
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Originally Posted by Lee DeRaud
Keying off the wheel-speed sensors of the ABS? That's how my Boxster worked.
I'll take a look in the FSM later if nobody comes up with a better explanation.
No. VSS goes to PCM and PCM calculates the speed and then drives the cluster with a PWM signal.
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Old Oct 30, 2014 | 12:32 AM
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Originally Posted by lionelhutz
No. VSS goes to PCM and PCM calculates the speed and then drives the cluster with a PWM signal.
Yeah, saw that once I located the right schematic. No idea how OPs speedo is working if the VSS isn't connected.
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