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> Speed Sensor Fault Where Are They?, car the rev counter and speedo stops working the vsc light comes on th
fire
post Oct 27 2007, 10:21 PM
Post #1


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Group: Members
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Joined: 27-October 07
Member No.: 7,357
Drives: 1997 toyota caldina gtt
Location: new zealand



Hi guys.... i'm a newb here I currently own a 1997 toyota calinda gtt 2litre engine number 3s-gte MODEL e-st215w-dwpzzz. i have a fault in the car that has got worst over time. the fault is that as you are driving the car the rev counter and speedo stops working the vsc light comes on the overdrive light comes on to stay o/d off. if you stop and turn off the ignition and restart car its resets to normal untill you drive or leave idleing for a which can be as short as 2 to 5mins or even straight away that it will go into fault mode again with all the same fault occurring as mentioned above.
I have had a auto electrican check out his finding on his computor read out was it was a speed sensor fault we then replace both right and left front wheel abs speed sensors as they could not find any speedo cable on the gearbox.
So they are asuming that the abs sensor give the speed of car. we replaced these and the car was still the same.
But they coulnt tell me why i the other things go into fault.
HAVE YOU HERD OF THIS HAPPENING BEFORE TO ANY BODY.
Do you now of a way to fix this problem.
THankyou Bruce.
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Hiebsta
post Sep 6 2008, 09:52 PM
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Joined: 6-September 08
Member No.: 13,671
Drives: 1997 Caldina GTT
Location: New Zealand



Hi i am having this problem with my car now i am just wondering if you ever got an answer and if so what was causing the fault.
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mobilenvidia
post Sep 8 2008, 10:42 PM
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Joined: 8-July 08
Member No.: 12,600
Drives: 1998 Toyota Caldina GT-T ST215
Location: New Zealand



I take it the ABS has motion sensors not speed, as it only detects when wheel(s) has stopped when the other(s) are still turning.

Speed sensor should still come from the gearbox but might be a electric cable (as the km's are clocked up digitally)
The speedo will work with the electronic pulses sent from the gearbox. (no more cables that break)
This is probably what is causing your issues.
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nz_aj
post Oct 15 2008, 07:28 PM
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Joined: 15-October 08
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Drives: 1998 Caldina 1.8L 5spd
Location: Auckland, NZ



My 98 Caldina is a 1.8L 7A-FE 5spd ABS version.

I think I may have the same problem too.

My LCD odometer is not displaying anything, along with speedo & rev counter not working.
This was an intermittant problem, happening for a couple of short period during the last few years. It now appears permanent.

My 5spd caldina does not have a speedo cable or an electronic pickup in the gearbox. Where the cable or speed sensor normally goes has a blank. My gearbox is a C52, C57 or similar, can't remember the exact number, but having had many Toyotas I'm familiar with this box & where the speedo normally connects. When I first noticed the problem, I only saw the speedo not working & this was the first thing I looked for. I assumed that it must be getting the speed signal from an ABS computer or similar, and until recently had been thankful it was an irregular problem.

I've pulled out the cluster & checked for broken or scorched/burnt components. I've disconnected & reconnected plugs there & at the engine computer behind the glovebox (pull out the plastic glovebox hinge pins for easy access). I've checked for voltage & ground at the cluster. There are two fuses which are not blown, labelled something like gauges & panel (fuses are behind pull out cubby hole to the lower right of the steering wheel, similar location as most toyotas I've had).

Hoping for a miracle answer please. I've got until the end of the year to solve this, when the car must pass a WOF, & needs a functioning speedo (I don't want to have to install a GPS or bicycle computer).
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nz_aj
post Oct 15 2008, 09:47 PM
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Drives: 1998 Caldina 1.8L 5spd
Location: Auckland, NZ



Now wondering if it is running a similar system to an Altezza???
Rather than One wire for water temperature, one wire for speedo, one wire for tacho, etc. Altezza system apparently runs differently. It only runs one wire to the dash for all of these, called something like 'MMC' or 'MMX'. It sends this one signal to the dash with all of the information imbedded in it; this signal is interpreted by the circuitry in the altezza dash; and sent to the appropriate gauges etc.
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nz_aj
post Oct 25 2008, 11:12 PM
Post #6


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Joined: 15-October 08
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Drives: 1998 Caldina 1.8L 5spd
Location: Auckland, NZ



SOLVED!!!

A surface mount component had broken off the odometer circuit board. Only two connections, soldered it back on and rev counter, odometer, speedo, ECONO light all work again.

To get to it first pull the instrument cluster out of the dash. I noticed this problem because the cluster rattled when shaken.

Then take the odometer module out through the back of the instrument cluster by undoing 2 screws, taking out a bulb & releasing the plug from the back of the module (plug is part of the flexible circuit board on the back of the cluster).

Then take the hard circuit board off the odometer module by removing 2 screws, pulling the odometer LCD out of it's plug & releasing the 2 plastic clips holding the circuit board.

The loose component & side of the circuit board where it should be connected can now be seen. Put a little solder on each circuit board pad, hold the component down & apply a touch of heat/solder to the connection on the side furthest from the edge & then the edge connection. The text on the component should be the same way around as the square ~40 pin chip beside it (not the ~4 pin folded down transistor looking device to the side)
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