Hey guys, I'm kind of chasing my tail on this. I've been reading, searching and trying different things to get a proper VSS signal to my Hondata S300 v3. I've tried replacing the VSS with a fresh OEM one, checked wiring, checked continuity with multimeter etc ... All with the same result, no VSS signal in the Hondata.

From some of my research it would seem that the OEM cluster is what sends the speed signal to the ECU. I've removed my OEM cluster as I'm running an AIM MXL dash, I've never noticed that there's an issue since the AIM uses GPS for its speed calculation.

I'd like to know if my research is correct? Do I need to wire the OEM cluster back in, in order to get a proper VSS signal to the ECU? Are there any other alternatives to getting a proper VSS signal to the ECU?

Any help is greatly appreciated, I'm kind of at my wits end with this one.

 

Yes on '88-'91 Hondas they use a speedometer cable from the VSS to the cluster. The cluster has a pulsar that sends the signal to the ECU. So you need to put the cluster back in to your '88 - '91 Civic / CRX and have the cable hooked up.

 

Hmm, car is a 99 Honda Civic so perhaps that's not the case. Is it then possible to directly wire the VSS to the ecu to b10 on the odb1 ecu plug?

 

Try a known good ecu. If you checked wires and sensor thats all it could be IMO.

 

sometimes I get this with OBD2B cars, but only some models get the 12v VSS power from the cluster - which is dead if you disconnect the cluster. It can also be related to a cheap jumper harness, for some reason.
If you have continuity from the sensor to B10 at the ECU, then your jumper harness is good. Otherwise your jumper sucks and you need to run a wire to the ecu.
If the ground wire to the VSS has continuity to the chassis, then it's the VSS power wire.
With key on, you should have 12v at the VSS plug. If not, wire it to a switched 12v source, problem solved.

 

That bit of info helps you know...

You can just do as VegasInvasion says. I am currently running an electrical VSS in two different cars straight to the ECU for the signal, 12v switched power, and ground of course. Works perfectly fine. Recheck everything from plug to ECU. The plugs are also notorious for bad connections / corrosion. Sometimes they need to be forced down pretty hard too.

 

Thanks for the info this really helped. I tested the ground wire for continuity at the VSS and it was good to ground (grounded it to the intake manifold). With the key on I tested for 12v at the VSS plug and saw it was getting ~13v (grounded it to the intake manifold). I'm going to try and wire the VSS signal wire directly to the ECU jumper harness and see if that fixes the issue. Otherwise I'm somewhat stumped as to why it's not working.

 

Wired the VSS signal wire white/blue directly to B10 on the jumper harness and still don't see anything in Hondata SManager I'm really stumped here.

 

To reiterate BadTurbo it's extremely common to have a corroded VSS connector and/or the tensioners in the connector pins are too loose to connect. You can visually inspect, but ideally you want to test it in action.
Backprobe each wire at the sensor with power on, manually spin the sensor: confirm 12v power, 5ohms or less from ground to chassis, pulsing from signal wire to ground. Repeat on the signal wire at the ECU, it should duplicate the results.
If not, replace the jumper harness, replace the signal wire, replace the ECU, replace the S300.
There's really nothing else that it can be.