Question about 1988 Pontiac 6000 Wagon

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Replaced vss do I need to reset ECU

The speedo was going crazy so I replaced the vss, but it still is not working. Do I need to reset the ECU?

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Probably wasn't the VSS to begin with and resetting the ECM won't help the speedo . 80% of all vehicle electronic issues can be tracked back to wiring and or connections. You need some diagnostic skills here, a few cheap tools like a DVOM and test light, and a wiring diagram. You have to test each circuit (wire) from one end to the other. Auto supply stores will hook up their scanner and tell people "Oh, you got a problem with ______." Their job is selling parts. Sure the scanner sees a problem with the VSS but it can't tell if it's the sensor, a wire, a poor connection, or the speedo itself.

Posted on Jan 01, 2014

  • Sandy Biggs Feb 02, 2014

    So I need a wiring diagram.

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1994 prizm speedometer eratic tried 3 used clusters and replaced sensor New schematic shows ckt runs through ECM is this a possibility


automatic or stick shift car???????
prizm = toyota corolla, (vast parts to be had and books on same)
1994
what are the symptoms, not guessing I need all facts on symptoms.
lets see. 1.6L engine or 1.8L , sorry they are not the SAME>
so what engine is there?

fuses test good?
car drives perfectly, all other electrics run ok , all lighting ok.
bad cluster , well what is bad, tacho, speedo, odometer, gauges, warning lamps. what?
say all things in the cluster that work and not work.
then and only then can any one give good advice.
ill run with only speedo needle bounces,
most 90s cars love to do that, its a fact. (high miles)
if need speedo and dead odometer that is unique.
that is correct more modern cars, all deleted that speedo cable
long long ago and is now a 10cent wire from cluster to ECU.
as did yours.
since the ECU knows speed already why not let it do the job for free. and did.
end history class but, the odd duck cars exist.

first thing to do is learn that the cars ECU has flash codes
you jumper 2 pins on a DLC, and the ECU flashes the CEL lamp with codes, if the code for VSS is set BINGO transmission VSS is dead, or erratic. code 42 tells you VSS is bad. does it flash 42?

The ECU uses speed, to calculate load and fuel better , knowing this facts.

but in your case its 1/2 true, the odd duck, the toyota way in 1994
is to have the VSS sensor drive the cluster
and the cluster speed drives the ECU.
(have book in hand from mitchells online, so can you of you look)

V3 is bad, (or as in all electrics, (laws) wires./loose/bad, there.
VSS means veh. speed sensor
my guess is you will ask where is it, like all here do not wanting
to pop 15bucks to read at mitchels.
At 55 mph:= 48 Hz ( the signal speed on it) square wave.

where it is depends on auto or stickshift
but its FWD and this sensor in on the side with axle ring gear
i guess.
the 3 wire sensor with R-Y, R-G and R-L color wires is a BINGO.

vss-5okvwe4z4w3ktgpaujwqctz2-1-0.jpg

Mar 28, 2017 | 1994 Geo Prizm

1 Answer

All my dash lights are on and no odometer


car runs? and moves?
headlights work (full bright not dim) all lights work.
you key on, and the warning lights glow, and the CEL lamp too.
that is first.
then the odometer
no OD
means what ( blank, stuck, wont roll if mechancal?)
the odometer must work on all cars if the speedo works
so does speedo work?

ill look up the system now, varies by year.
first off , all answers USA cars on this USA forum.
cant do others. ever.
omg its GM car, in sheep skins...
s10../blazer
what engine, you do know systems vary by ENGINE. in car.
ill guess. now.
4.3L engine
the ECU has a 2 wire connection to the VSS sensor (speed)
so that means the ECU sees all speeds and sends those to the
cluster and odometer.
it uses 2 wires to the cluster to talk.

the first wise step on all cars is to check fuses.
then scan the OBD2 port
if the scan shows VSS dead, it is. P0502 or P0503?
end story, fix VSS, (replace it or clean it)
if no errors with VSS and speedo works (do says so.....?????_)
then the odometer is messed up. (not good that)

the books says if any part of cluster is bad. the whole cluster must be changed out.
but fails to say, (bad) that if MPH and ODOMETER
are dead., the VSS is bad. and the scan tool told you that.
all scan tools sold work here,
why not scan it first like we all do.....(never work blinds)

Sep 26, 2015 | 1998 Isuzu Hombre

1 Answer

My 1999 Isuzu hombre odometer not working how to fix???? Asap


if the speedo works, and odometer not then the odometer is bad.
what is VIN/ in what country, so i can look this up.
1999 are transitional year, in USA fed laws on this changed.

on old cars, the speedo cable ran both . so if one dies only
that which died is bad.
in later years, the speedo is run by ECU, from VSS inputs
and obometer is digital and stored in the ECU. (or BCM)
and the cluster is just a digital display and if its dead , then it is dead. this display.
one even newer cars, comm errors on CAN-buss can cause this.
2004 up. but you dont have this bus.
did you scan it first and check all fuses.>?
scan it to see that VSS is wrong, by live data stream, or DTC error, driving for VSS dead.
ill not post details lacking country , as other countries laws vary on ODOMETER TYPES> big time.

Mar 24, 2015 | 1999 Isuzu Hombre

1 Answer

99 silverado abs light stays on transmission won't shift from 1st and speedo doesn't work I have replaced all vss sensors and checked fuses and still no luck help please!


for the speedo its going to be a speed sensor and with the ABS light on it will probably be an ABS sensor you'll have to figure out which one.Does the speedo go crazy sometimes or just doesn't work at all

Mar 28, 2014 | Cars & Trucks

1 Answer

Speedometer going crazy


USA or non USA car. not knowing this makes answers , all wrong.
define crazy.?
if bouncing like mad"? is
1: the cable to it bad. if cable good ,speed is bad, (tests, ask)
2: if the cable gets bad enough the CEL comes on and shows bad VSS. (DTC) veh.speed sensor, dead.
oops 99 is a cust year,
every page in fsm (related) shows if equipped.
cable speed (old school)
electric gauge, no cable. new cars. cusp year.
that means , one looks for the cable to the
tranny or to the not stated 4wd transfer case.

if its a 100% electric gauge
and crazy means bouncing?
its:
A: bad meter.
B: bad power to meter (or loose fuse or speedo connector plug)
C: Bad ECU (hah)
D: vss input to ECU is crazy,

or go to alldata.com and read, its all there. RTM.




Nov 21, 2013 | 1999 Suzuki Grand Vitara

1 Answer

95 buick regal custom speedo issues


There is a gear that drives the sensor gear much like the old speedo cable gear.
If you connected the sensor and the check engine light went off, chances are the sensor is working.

Jul 04, 2013 | Cars & Trucks

1 Answer

No overdrive on a 2.8 pajero and then speedo stopped working


In 2.8 Pajero the speedo receive electronic signal from the VSS sensor, but if the speedo for any reason stop working, O/D will stop work because the Trans ECU needs signal from the speedometer electronics to made the gear change into O/D

Feb 13, 2012 | 1995 Mitsubishi Pajero 1.1

2 Answers

Hello, I have a 96 tercel with a 4sp man. I recently replaced the speedo cable to fix a MIL on due to VSS code. The cable had been broken for some time. After in stalling the new cable I still have the VSS...


you have to replace the speed sensor itself not just the cable to correct that problem, the cable doesnt do anything with the computer, try that sensor and youll be ok.

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