I've tried to search this but iono if I'm doin it wrong or what the deal is. But I can't seem to figure out why my odometer doesn't work. I switched vss sensor with a know working 1, still nothing. I traced the orange wire from it, into the ecu and seems to have contact. Is it supposed to have a power source? Stock gsr tranny, chipped with chrom p28 ecu....it would come on and off every so often before it just died. I cleaned the plug connectors to the vss sensor as well.....hmmmmmm any fuse or something for it? Thanks fellas

Gabe

 

so, is it the odo? or is it the speedo?

 

The speedometer....my bad....but odo as well. Speedo no wrk, odo no move.... Haha

 

you can try spinning the sensor with a drill. see if the gauge moves.

 

Spinning it? Ummm I have a drill. Lemme c if I can figure out how to hook drill up to sensor....lol if it sp

 

there is a cable that goes right into the speedometer on the back of the cluster.it is a bitch to get in correctly.sounds like your problem if your cluster has been removed recently..

 

A cable? Yea it has been removed recently...I dnt remember seeing a cable tho. Just the 2-3 plugs...I'll check it out again...thanks bro

 

no, there's no cable. he is mistaking this for pre 93. 94 is an electric vss
know what? find the cluster pinout and test for varying voltage at the vss signal pin while somebody drives, or run it on jackstands

 

Yea, I just pulled cluster back out and yea there's no cable....I don't have a multi meter to test voltage

 

Does the vss need power? Like the plug that's on top of sensor. It has 3 wires. Does one of them put power to sensor n tranny? Or does the part inside tranny spin as is moves, and sends a signal to speedo or ecu?

 

yes. a 3 wire sensor will have reference voltage (usually 5 volts), reference ground, and signal. you can check for power and ground at the sensor. KOEO.

 

Okay, I have a test light....with key in "on" position, there should be power at sensor? Plug on top

 

What's "KOEO" mean?

 

Does the power it needs come from battery or ecu? I checked all my fuses n both places and they were not blown but could this be a fuse issue?

 

KOEO is key on engine off.
power comes from ecu, yes.
if it's a 12v test light, it may not light, or light very dim. since Vref is only 5v

 

So they ecu sends power to sensor, then sensor sends signal back to tach?

 

signal should go back to ecu, then to the cluster. otherwise, ecu would never know speed
unless it goes to the cluster, and then ecu. not 100% on that. but the ecu does recieve the signal at some point for sure

 

sorry for the misinformation.i was indeed thinking of my 91 teg.didnt know it is electric on the 94s so i learned something new

but,either way, youre on the right track.somewhere there is a bust in the connections.

 

Hmmmmmm so I guess I'll pull sensor out and try n spin it and c if it'll move

 

Although a simple 12V test light is a very handy tool, but unless your 12V test light is the LED, [computer save/low load] type, do not use it to test reference voltage, it can damage the ECU/ECM.

You have already replaced the VSS with a known working one, finding and trying a known working cluster, [maybe borrow a friends] would be the simplest way to troubleshoot your problem.

To bad it is a 2.5 drive to your closest PicknPull a cluster assembly there is $28.99, you go there and pull a cluster, pay for it, then immediately, pug it in and try it, if it does not work, you go get another one, not practical if you have to drive 5 hr., maybe worth the drive if you determined, [by swapping in a borrowed known working one] that the cluster was the problem. 94

 

I have swapped it with known working clusters as well :/

 

you need a wiring diagram for the vss to continue testing

 

 

yes, i know it sucks. but that's what shops pay thousands of dollars in diagnostic aid programs for. if you go to a reputable shop with a case of decent beer, i'm sure they'd be more than happy enough to print you out the diagram. mitchell is a great program for systematic diagrams. see if they run them.
you'll also need a multimeter

 

Lol case if beer? LEZ GO! Haha as long as I can help drink it! Lol nah but the closest shop to me is like 2 n half hours away. One way.....And not even sure if it would b called a "reputable" shop... Smh