Question about 1994 Isuzu Trooper

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Over drive lamp flashes and i lose over drive +speedo not/working

Only just got car it is a auto 3.1 bighorn fluid looks clean level looks ok smells ok not sure if it is dextron2 is there a filter i can change if so where will i find it .seems to hold onto the other gears a little to long as well and speedo not working but chap left a road angle in the car so know how fast i am going cheers peterfurry

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  • peterfurry1 Jul 20, 2009

    cheers simontricket this sounds a good fix may remove the sump and clean that mesh filter and check the speedo electical connector and speedo transduser dexton 3 cool i think i can get some of that at work cheers again furry

  • peterfurry1 Sep 17, 2009

    found to be a speedo sensor

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Most common fault is the speed sensor on the transmission as it signals the box to give you O/D . Dexron III is the oil and no filter to do unless you want to do a autobox sump off ! its a mesh thing isuzus say its lifetime .

Posted on Jul 20, 2009

Testimonial: "cheers mate speedo sensor 200 pounds but did fix"

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There is a problem with the over drive section or lock up torque convertor it is not applying when it should thats when the O/D lamp flashes.
suggest trans repair shop repair

Posted on Jul 17, 2009

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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

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1 Answer

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follow this steps and fix it. God bless you
First, check the transmission fluid level and condition. If you don't know how to do it, here is an illustration:
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With the engine idling and transmission in "Park" (some car may have different procedure, refer to the owner's manual) remove the automatic transmission dipstick and wipe it out with the clean lint-free cloth. Insert the dipstick back fully and then pull it out again. Check the fluid level; low level may indicate a transmission leak. Look at the fluid very closely. It helps if you drip the fluid onto a white paper to be able to see the fluid condition. The transmission fluid should be clean and transparent, without any metal filings or black flakes. The new fluid usually comes red. Over the time, it become more brownish, but it shouldn't be very dirty or black. Look at the image. Try to smell the transmission fluid; It should not have a burnt smell.
All this may seem difficult, but when you check few similar cars, you'll be able to see the difference. If the transmission fluid is too dirty or black, or smells burnt, it's better to avoid such a car.
Keep in mind, however, that some modern cars don't have the transmission dipstick and require special procedure performed in the auto repair shop to check the fluid level. In this case, the only way to check the transmission is on test drive. cc037824-574e-464e-b4e8-ab64c6eee062.jpg

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follow this steps and see the diagram attached.God bless you

First, check the transmission fluid level and condition. If you don't know how to do it, here is an illustration:
How to check the automatic fluid
With the engine idling and transmission in "Park" (some car may have different procedure, refer to the owner's manual) remove the automatic transmission dipstick and wipe it out with the clean lint-free cloth. Insert the dipstick back fully and then pull it out again. Check the fluid level; low level may indicate a transmission leak. Look at the fluid very closely. It helps if you drip the fluid onto a white paper to be able to see the fluid condition. The transmission fluid should be clean and transparent, without any metal filings or black flakes. The new fluid usually comes red. Over the time, it become more brownish, but it shouldn't be very dirty or black. Look at the image. Try to smell the transmission fluid; It should not have a burnt smell.
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Keep in mind, however, that some modern cars don't have the transmission dipstick and require special procedure performed in the auto repair shop to check the fluid level. In this case, the only way to check the transmission is on test drive. 68c27b4c-81ab-4513-9708-389569a89182.jpg

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1 Answer

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Had 2 Bighorns an would never buy another! But when there are no probs, these trucks are fantastic!! Frankster016

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