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E30 318I tacho reading low (approx.50%) and l/100 gauge not working

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Posted on Jan 02, 2017

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SOURCE: 99 lancer,speedo tacho n gauge problem.

probably burnt or cracked circuit board on back of gauge cluster

Posted on Jun 21, 2009

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SOURCE: speedo,tacho,fuel gauge,temp gauge stopped working

Maybe, a wire came lose. Did you hit anything? Spill any water inside? Could be a short, considering they all went out. Did they all go out at once?

Posted on Jan 13, 2011

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My tachometer quit working in my 2001 rodeo,ive checked all the connections ad it stills not working how can i fix the problem

no engine stated. ouch....
all else work? car drives, no mifire????
no low MPG?
no CEL lamp glowing driving,?????? check engine light,.??
if the cluster TACH (stock ) is dead.
then its bad, or the wires from it to the PCm. are bad.
of other cluster gauges or lamps are dead, the fuse blew to the cluster.
that is all i can do working blind, id have to see all to tell all.

ill get your custer drawings and look for you, you can too at Mitchells DIY'
there is 2001 rodeo and rodeo sports. ill guess non sport.

ok the PCM if you scan it and RPM reads ok then all that is ok
the PCM on this car sends RPM data , on 1 wire to the techo,
if it arrives there, (wires) then the tacho works if and only if it has power, if the coolant gage works that means tacho has power too. as they sit on the same power rail in the head.

Oct 27, 2016 | 2001 Isuzu Rodeo

1 Answer

My Sonoma 4.3 v6 is having some issues the rpm gauge is jumping at any giving time besides idling would you know why and I couldn't run dynastics

tachos get their signal from the coil or the ignition control module or ECM
check for ;loose / broken wires in the harness or at connections
There will be no fault codes for tachs unless it affects an adjacent sensor
could be a faulty tacho unit (tacho--tachometer--rev gauge --rpm indicator )

Jan 06, 2016 | Cars & Trucks

1 Answer

1989 regal tach stopped working

check for a faulty wire/s to the tacho of a faulty tacho unit
the tacho gets its reading by the ignition impulses so any engine running problems may have been a result of the faulty tacho or wires.

Jun 11, 2015 | Buick Regal Cars & Trucks

1 Answer

2003 Satria, Tacho and Fuel gauge dont work . Fuel gauge comes up now & again low fuel light works. Tacho works now & again. But speedo and temp do work all the time.

It may be that the speedo and temp are mechanical, whereas the tach and fuel are electrical. Check fuse for inst. cluster for clean and tight fitment. Check electrical connection at back of inst. cluster.

Dec 09, 2014 | Cars & Trucks

1 Answer

Tacho and speedo incorrect readings

compared to what?

tell method of test.
tell numbers. my engines idles hot at 800 (hand tacho)
but gauge reads in dash 200.
or im going 50mph ,my cell phone with free GPS shows 40.
like that, use real numbers.

Jan 31, 2014 | 1992 Toyota Celica

1 Answer

Tachometer not working correctly - reads low

what engine, what transmission? ok ,no one ever knows....
gas, not diesel low, compared to what>? you have a hand held
optical tach? like me? or is this post just a post
saying why is my engine idling way below 800.
or why is my slushpump A/T stuck in 4th gear.?
ever scan the PCM? do so, or miss the boat (i promise)
lets say the tach reads, 2000 but my opto scan shows 3000.

the cluster brain gets tacho data , via a data buss (CAN) from the
PCM brain, so scan the PCM for errors
it can be 3 things.
1: bad tacho.
2: bad PCM , no way
3: bad comm buss. if you see scanned DTC errors for the comm buss fix that first.

Also the PCM , you connect any scan tool made to the 16pin DLC
and see live RPM, it its correct? and no comm errors?
then the I/P cluster brain is bad or gauge. (or scrambled)
id reset the cluster head power. the fsm covers this.
its the memory wire. to the head.
but resetting things can be dicey. if not done right.
The PCM will report all RPM errros.

the FSM is here. buggy it is...

id check all fuses.
id scan it
if head lies. and PCM scan shows good.RPM
id then reset the head, the fuse are OID named, (hot all time)
do you have your glove box , operators guide.
in mine on page 400 is the fuse box. see that.?
mine has 2, m13 fuse is mine. ill look yours up. now
ok its fuse #17 (IOD) IOD means ign. off, draw (old school hot all time) F17 is 10amps.

do not pull fuses in a random way
or ever pull the battery cables.
or you might find bad happens, lost radio codes and other issues
even security system goes nuts.

Aug 29, 2013 | 2004 Jeep Grand Cherokee

1 Answer

99 lancer,speedo tacho n gauge problem.

probably burnt or cracked circuit board on back of gauge cluster

Jun 21, 2009 | 2002 Mitsubishi Lancer

3 Answers

1997 CE Lancer speedometer

i had the same problem on my g/f's 2000 lancer GLXi, (with tacho),
i fixed the problem by putting a jump wire on the back of the instrument cluster,
the fault was in the wiring to the tacho part & i drew up my own wiring diagrams for the cluster unit,
then traced the fault,
looking @ the back of the cluster unit, the top right hand screw for the speedometer,,, follow the track on the circuit-board, there is a link wire UNDER the board (there is a dotted line on top where it goes, i think its the left 1,,, there is 2) this track then goes to the bottom left screw on the tacho,,,
i soldered a small gauge wire from the bottom of the link solder joint (MAKE SURE ITS THE CORRECT LINK, THERE IS 2 SIDE BY SIDE) to the bottom right track on the vertical plug socket (its common pos for the warning lights) this is where the "MIRAGE" & other "CE LANCER" (without tacho) gets its speedometer & gauges power from,

kind regards waz
if anyone needs a photo i will pull out the dash again lol its only 6 screws

Jul 17, 2008 | 2003 Mitsubishi Lancer

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