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VSS on a 91

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Old Mar 22, 2021 | 01:05 AM
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Default VSS on a 91
I'm wondering if the VSS ties into the EFI for any reason, or the cruise control. Basically, if the VSS was broken would it affect anything other than the speedo and odometer?
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Old Mar 22, 2021 | 01:19 AM
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Upon purchase '90 vert with T56 transplant, the VSS was never hooked up and upon decel to a stop, the engine would always stall.
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Old Mar 22, 2021 | 06:21 AM
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The VSS on your 91 goes to the ecm, from there it goes through the firewall and splits 3 way's, I can not remember if it goes to the ccm first but it feels the speedometer, the radio, and the cruise control.
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Old Mar 22, 2021 | 07:39 AM
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If the car is an FX3 the VSS signal would go to the FX3 from a splice prior to the ECM, if speedo & odo are correct you can assume the ECM has corrected VSS to CCM and the splice to CC and SCV are in tact. Functionality requires confirmation.
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Old Mar 22, 2021 | 09:01 AM
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Just to add to the replies, the VSS will also affect the way the engine runs. In particular, as you coast or brake to a stop it will want to die.
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Old Mar 22, 2021 | 06:27 PM
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Originally Posted by MatthewMiller
Just to add to the replies, the VSS will also affect the way the engine runs. In particular, as you coast or brake to a stop it will want to die.
That's odd but interesting to know. Thanks.
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Old Mar 22, 2021 | 06:28 PM
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Originally Posted by eutu1984
The VSS on your 91 goes to the ecm, from there it goes through the firewall and splits 3 way's, I can not remember if it goes to the ccm first but it feels the speedometer, the radio, and the cruise control.
Does the VSS adjust the radio volume? Just wondering why it goes there?
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Old Mar 22, 2021 | 07:00 PM
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Yes the VSS also control's the factory radio volume.
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Old Mar 22, 2021 | 07:02 PM
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I had the VSS wire short out going from the ecm in under the dash, it courses all sorts of problems with my speedometer and cruise control.
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Old Aug 15, 2021 | 05:07 PM
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Originally Posted by eutu1984
I had the VSS wire short out going from the ecm in under the dash, it courses all sorts of problems with my speedometer and cruise control.
What sort of symptoms were you having? Did it go to "0" intermittantly? I have one here that goes to 0 and the cruise cuts out when that happens.
Which wire was it that you repaired?

Thanks,
Jebby
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