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Old 07-16-2019, 04:57 PM #31
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Quote:
Originally Posted by hamsandwiches View Post
Is the body ECU on the DOME fuse?
The body ECU has connections to many fuses - MPX-B, ECU-IG, POWER, HORN, WIPER, ACC and probably others.

You are on to something here through - it might be worth trying to remove individual fuses instead of the battery main ground to try to see which one resets the cluster.

A replacement body ECU might be worth trying to see if that can do it too - I did finally find one direct connection between the Body ECU and the Gauge Cluster (Combination Meter) on the multiplex communication bus pages of the diagrams - it look like it could be some sort of communication between the two.

-Charlie
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Old 07-17-2019, 10:20 AM #32
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Ok. I think I will be sourcing a body ECU.

While I'm at the yard, what other parts should I pull?

Where are the other ecus?

Maybe I'll pull a third cluster lol

Help
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Old 07-18-2019, 01:06 AM #33
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Quote:
Originally Posted by hamsandwiches View Post
Does anyone have downloadable copies of the instrument cluster wiring diagram?

I've been using this one which shows the 15 amp DOME fuse circuit. Just checked the sunroof and dome lights as well as the door courtesy switches.

Does the cluster receive power only from the DOME circuit? Or from other places once the engine is started.

Still scratching my head
From the 2000 EWD manual.
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File Type: pdf 228 Combination Meter.pdf (81.9 KB, 9 views)
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Old 07-18-2019, 09:51 AM #34
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Thank you Durk.

Trying to decide what the diagrams tell me given my symptoms.

Think it could be something on p 229 because that contains all the affected gauges.

Water temp gauge is on next page and is not affected when my problem happens.

That said, what should I look for??

Not used to electrical diagrams (teenager)

Thanks again
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Old 07-18-2019, 12:14 PM #35
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Quote:
Originally Posted by hamsandwiches View Post
Thank you Durk.

Trying to decide what the diagrams tell me given my symptoms.

Think it could be something on p 229 because that contains all the affected gauges.

Water temp gauge is on next page and is not affected when my problem happens.

That said, what should I look for??

Not used to electrical diagrams (teenager)

Thanks again
Honestly, your symptom set is pretty off the wall. And, as Charlie said, the diagrams are not meant to give detail on the internal wiring of units. My guess on this is you have an intermittent fault (wiring short?) on one of those gauge inputs outside the module that kicks the module into some kind of safe mode. Intermittents are a pain. I would look over the wiring to the speed sensor to start with and then the other affected gsuge inputs.
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Old 07-18-2019, 12:20 PM #36
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Quote:
Originally Posted by hamsandwiches View Post
Thank you Durk.

Trying to decide what the diagrams tell me given my symptoms.

Think it could be something on p 229 because that contains all the affected gauges.

Water temp gauge is on next page and is not affected when my problem happens.

That said, what should I look for??

Not used to electrical diagrams (teenager)

Thanks again
228 and 229 are where all your problems are happening, all are connected to that inner box inside the gauge cluster that probably represents the logic board attached to the back of the cluster:



The connectors C27 (E) and C28 (D) in the diagrams are the white and blue ones on the "MAIN PCB1" above. Since you changed gauge clusters and the problem persists, it likely isn't the cluster itself, but how it is interacting with the rest of the truck.

The connection now that concerns me is the G-W wire on page 228 that is "From Body ECU" - there is no description of how/what that wire does - but if it is some sort of communication, that may be the problem.

-Charlie
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Old 07-18-2019, 02:07 PM #37
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Ok thanks. I will get a 99 or 00 body ECU from the yard.


Where is the speed sensor located? I thought 3rd gens get that info from the wheel (ABS) sensors.

If they're still on the one i pulled the cluster from, ill get the sensors too.

What else should I pull off the donor yard 4runner that might be related?

Strange how no one has ever heard of this happening...
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Old 07-18-2019, 02:52 PM #38
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Quote:
Originally Posted by hamsandwiches View Post
Ok thanks. I will get a 99 or 00 body ECU from the yard.


Where is the speed sensor located? I thought 3rd gens get that info from the wheel (ABS) sensors.

If they're still on the one i pulled the cluster from, ill get the sensors too.

What else should I pull off the donor yard 4runner that might be related?

Strange how no one has ever heard of this happening...
On a 5-speed they do. I don't know about autos. There is one on the EWD.

Here is the Combo meter inspection chapter from the 2000 FSM. You might consider doing the tests in the first part which are tests of the truck, not the module. If something is out of spec, it might be a clue.
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File Type: pdf BE-42 Inspection (2000 4Runner) Combination Meter.pdf (228.3 KB, 8 views)
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Old 07-18-2019, 03:35 PM #39
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I had all my gauges, odo and ABS completely die on my 2001. Also got a CEL and running a reset through the diagnostic plugs came up short. Turned out to be the ABS ECU was dead. Itís different for 01 / 02 but replacing the whole ECU cleared my issue up after a ton of research in the FSM. It was written in very tiny print as an aside, like ďif the reset doesnít work, maybe the computer is dead?Ē The ABS ECU on yours is behind the passenger footwell trim panel, outboard side, iirc.

Not sure if that helps at all but may be a clue to start. I was v surprised that my odo was running through that computer, but whatever...Iíve been fixed and fine for the last 7-8 months.


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Old 07-18-2019, 05:26 PM #40
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Quote:
Originally Posted by hamsandwiches View Post
Where is the speed sensor located? I thought 3rd gens get that info from the wheel (ABS) sensors.
For non-ABS 4Runners, it is on the rear output of the transfer case (or transmission tailhousing if 2WD). All others use the ABS computer. A signal comes from the ABS computer to the gauge cluster (GR-L grey-blue wire), which then takes that signal and drive the speedo/odo and the rest of the truck (G-O green-orange wire).

-Charlie
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Old 07-18-2019, 06:40 PM #41
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Ok so from what ive gathered, I will pull a body ECU, abs ecu, and all 4 wheel sensors if i can find them.

About to look through that diagnostic.

Thanks guys!
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Old 07-18-2019, 06:50 PM #42
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Durk, That instrument cluster test diagnostic is very thorough, but I'm almost positive the issue isnt the cluster because I already replaced that and it is giving the EXACT same issue now as the original cluster.

I see the truck body tests, I will look into those and also the wheel sensor tests
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Old 07-18-2019, 06:50 PM #43
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I don't think the ABS ECU or the wheel speed sensors are the problem - those wouldn't have anything to do with the tach or fuel level gauge... That's also why I asked if the OBD speed reading was still valid when the gauge cluster 'locks up' - it would tell you if that part of the circuit / truck is still working and it is just the display on the cluster that is going wrong.

-Charlie
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Old 07-18-2019, 07:08 PM #44
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Duck, I understand the tach and fuel gauge are on the same circuit as the speedometer, so maybe the weird signal from the ABS ECU is disrupting the adjacent gauges?

My OBD speed live data has never worked on torque lite, it cuts in and out from the correct number to zero. I only have tested that once this issue began.

Can't imagine that if thats the true data the engine ECU is receiving it wouldn't trigger a CEL or ABS light.

So basically I have no clue what the OBD speed reading is when the issue is happening or when its not.
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Old 07-18-2019, 09:01 PM #45
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Quote:
Originally Posted by hamsandwiches View Post
Durk, That instrument cluster test diagnostic is very thorough, but I'm almost positive the issue isnt the cluster because I already replaced that and it is giving the EXACT same issue now as the original cluster.

I see the truck body tests, I will look into those and also the wheel sensor tests
Yeah, I was not suggesting the cluster tests. Just the body tests.
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