Speedometer Diagnosis
#1
Speedometer Diagnosis
My speedometer quit today. I’ve been reading the forums and trying to diagnose what caused it to fail as to not waste a lot of time and money on fixing it. The basic symptoms were that the speedometer and odometer and trip meter all stopped working and the O/D light was blinking. Stopped the car after a few miles, shut it off and sat for 10 minutes. After restarting both were working, no blinking O/D light but the speedo was inaccurate. Not a little inaccurate but a lot like reading 22 mph when I was easily going 60 then it quit again. O/D light did not start back up again. Car seemed to shift fine and run fine throughout all of this
Looks to me like there are a number of suspects:
Speedometer Sensor
wiring from the sensor to the speedometer
the speedometer cluster
ECB
My thoughts on this are it probably isn’t the speedometer sensor at the transmission because it still shifts fine and that probably eliminates most of the wiring as well. I’m also eliminating the speedometer cluster since the problems there seem to be mechanical (ie lube leaking out causing the needle to stick) and the digital odometer quits at the same time.
So with all that I’m thinking it’s the ECB and probably the leaky capacitor issue talked about here. That being said am I missing something? Any thoughts from you guys that have lots more experience?
Thanks in advance.
1991 LS400
Looks to me like there are a number of suspects:
Speedometer Sensor
wiring from the sensor to the speedometer
the speedometer cluster
ECB
My thoughts on this are it probably isn’t the speedometer sensor at the transmission because it still shifts fine and that probably eliminates most of the wiring as well. I’m also eliminating the speedometer cluster since the problems there seem to be mechanical (ie lube leaking out causing the needle to stick) and the digital odometer quits at the same time.
So with all that I’m thinking it’s the ECB and probably the leaky capacitor issue talked about here. That being said am I missing something? Any thoughts from you guys that have lots more experience?
Thanks in advance.
1991 LS400
#3
Also there is no "lube" in the needles. Needles reading much less or needles that don't move at all are both symptoms of gauge cluster problems.
It was either a coincidence or there is still something off with the transmission sensor.
If the odometer logs one mile at 60mph in exactly 1 minute then the problem is the speedometer. If the odometer is off then trans sensor.
It was either a coincidence or there is still something off with the transmission sensor.
If the odometer logs one mile at 60mph in exactly 1 minute then the problem is the speedometer. If the odometer is off then trans sensor.
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262-456-4147
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#7
I've been driving it for a bit and today the whole cluster went dead. Temp gauge, tach speedo, gas gauge and cluster lights. Nothing. The weird thing is the alarm for when you leave your lights on also quit as well as the auto seat adjustment (seat 1 and 2). I did check fuses they all look good.
I'm guessing I'll need to read up on pulling the cluster out and get it sent off and then take it from there.
I'm guessing I'll need to read up on pulling the cluster out and get it sent off and then take it from there.
Last edited by gkane; 09-15-15 at 01:51 PM.
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#9
Then it is always the cluster.
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262-456-4147
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262-456-4147
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#11
Same concept. The cluster is likely the issue.
__________________
TANIN AUTO ELECTRONIX
262-456-4147
contact@taninauto.com
www.taninautoelectronix.com
TANIN AUTO ELECTRONIX
262-456-4147
contact@taninauto.com
www.taninautoelectronix.com
#12
Smack the dash on top of the speedometer. See if it comes to life. I lived down at the beach for awhile and mine starting acting up. At the suggestion of some here, I did this. Had to do it every couple of weeks. Since I have quit living at the beach, it's given me no more problems.
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