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Old 11-13-2019, 07:50 PM #61
phattyduck phattyduck is offline
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Originally Posted by cahilc View Post
Edit: Was reviewing past comments and you were having trouble reading speed using Torque Lite? OK that's weird. Leaning more toward the abs/speed sensor speedometer side.
Not too weird. The ABS system sends a speedo signal to the gauge cluster, which then modifies it and sends it to the ECU. If the speedo is whacko, it could/would affect the speedo signal to the ECU. It is a hold over from older Toyota setups that either had mechanical speedos (where the electrical drive to the ECU was in the gauge cluster) or electric speedo drivers (where there still was electrical modification of the speedo signal before it was sent to the ECU).

-Charlie
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Old 11-13-2019, 11:51 PM #62
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Gotcha Charlie & TX.

Trying to see if we can break down the circuit into smaller diagnostic chunks.

Or if there's another way to disconnect something besides battery or dome fuse that would clear the cluster. Help narrow down the view of the problem.

Cheers - Cahil
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Old 11-14-2019, 05:52 PM #63
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Ok so in an effort to narrow the issue down - I have found that the problem resets just like pulling the dome fuse if I pull this blue plug from the back of the cluster - guess now cut each wire next time it happens?? I will look back at the diagrams and see if the color of the plugs is labeled.

Also - pulling ABS fuse does nothing and unplugging the fuel tank plug does nothing.

This is that plug that when pulled, resets it.
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Old 11-14-2019, 07:12 PM #64
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That blue connector is "C28" or D on the Combination Meter pages.

Pin Color Function
1 Gr-L Raw speed signal from ABS ECU
2 B Tachometer signal from igniter
3 G-O Conditioned speed signal out to ECU, etc
4 Y-R Fuel Level Sender
5 O Fuel Level Sender
6 Br-B Ground for Fuel Level Sender
7 B-W Neutral signal
8 Couldn't find this on the diagrams, probably unused?
9 Should be unused
10 G Illumination power (10A Tail fuse) and other unknown functions
11 W-G Illumination variable negative voltaget (to rheostat)
12 L-Y To 15A Dome fuse (door ajar light and other unknown functions)

So, next try pulling these fuses individually:
- 10A Tail
- 15A Dome

And see if either/both reset it.

-Charlie
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Old 11-14-2019, 07:50 PM #65
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duck, thanks so much for that info!

the 15 amp dome resets it - I am not sure about the 10 amp tail fuse
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Old 11-14-2019, 08:33 PM #66
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guess now cut each wire next time it happens??
Don't be cutting wires! You can remove wires individually from those plugs (just take note of where it goes back!) if you have a small pick and you lift up the pin retainer.

-Charlie
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Old 11-15-2019, 12:25 PM #67
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While its plugged in??
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Old 11-15-2019, 01:22 PM #68
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While its plugged in??
No, you won't be able to remove wires while it is plugged in, sadly...

Another thought I had - removing the Dome fuse resets it, but any of the wires on either the blue or white connector could be the thing that initiates the problem.

It is just so weird that two different gauge clusters had the same (ish) issue!

-Charlie
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Old 11-15-2019, 02:44 PM #69
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Right, but unplugging the blue plug resets it - so how would I go pin by pin with it plugged in without cutting/reconnecting each wire?


As soon as it resets, I have to wait for it to happen again which is extraordinarily inconvenient.

I think the fact that the same thing happens on a different cluster is enough reason to believe the issue is not the cluster(s)
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Old 11-16-2019, 05:38 PM #70
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Has anyone made a 'breakout box' for that blue connector?

Would be possible to make a breakout box for the connector with long enough wires to bring the access box eternal to the dash.

Install, drive around until the condition happens the look at the box for lights and disconnect the individual lines accordingly.

Would eventual find the exact line but I'm not convinced of a solution yet because of a lot of unknowns of how the circuit works.

Not sure yet if it's a physical problem (voltage/resistance) or a logical problem (chips/logic) . Seems to be leaning toward the latter.

Edit: definitely 10a tail fuse check and would be worthwhile checking those lines against the combination meter diagnostic.

- Cahil

Last edited by cahilc; 11-16-2019 at 09:34 PM.
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