I was just curious what voltage the ECU sends out to the VSS on an OBD1 and OBD2 car?? I'm going to be putting an CTR cluster into my friends 88 CRX so I need to add a electrical VSS in. I know that for the mechanical speed sensor it just spins the cable goin into the cluster which generates the pulse that gets sent back down to the ECU for it's reference. If i were to tap off that voltage going into the cluster before it is sent back down to the ECU I could run it out to the electrical VSS. I would then have to run it back into the car where it would be split so that one pulse would feed the cluster and the other would go directly to the ECU. I just thought this up the other day so please tell me if for some reason something doesn't seem like it's gonna work. The one part i really have a question on is with the non-OBD PR3 ECU, how many pulses does it look for, for every one revolution made by the stock speed sensor. I know that the electrical VSS have continuity four times for every one revolution. It's not really that big of deal i the ECU thinks we are going slower or faster than we really are since i already chipped it with no speed limiter but I was just curious. Thanks in advance!


[Modified by JDMspecEG6, 12:21 PM 11/6/2002]

 

The voltage is +5v

Sonny

 

Cool thanks, do you know about the pulse rate for cluster to ECU for every one revolution..

 

There should be 4 +5v pulses per revolution of the speedo cable.

Sonny