Check EV System Message - My particular case/solution

[alflash]

Yes, the fourth pump is the cabin heater pump.

I think that the pumps fail more often than they do on ICE vehicles because, while an ICE vehicle runs its water pumps only when driving, an EV runs them when charging, too. Since charging is at fewer MPH than driving, they run them >> more.

As for not being familiar with the innards, neither (blissfully) was I until a few weeks ago. It was a learning experience born of necessity. The basic diagnostic service on this would have been $869 through the dealership. Then the cost of the part alone would have been >$500+tax. I think it could be done in one shop hour (~$100).
So >$1400 for a damned water pump.
-Davio

For that kind of money ($869), you are given documentary diagnostic results* (DTC, Live Data, Data List with the parameters of Tesla systems and of HV battery) in your hands or only Health Check Results using Toyota Techstream soft?

For example, Toyota Part No.:G9040-33020 Price is $259.12 in https://www.toyotapartsdeal.com/oem/toy ... 33020.html

*

http://alflash.com.ua/phpBB2/download/file.php?id=3536

[dfergenson]

This is what Toyota of Palo Alto says about the service:

A trained technician will analyze (diagnose) your concern. As a result of diagnosis, an estimate for repairs or additional diagnosis as required will be provided to you. Diagnosis fee does not include cost of parts and/or labor to complete repair. Please address any concerns directly with your service advisor upon arrival.
Disclaimer regarding price:
Waived if covered under factory or extended warranty. Dealership will determine eligibility.

As for the part, thanks. Yes, that would save me a few hundred dollars off of the Toyota of Walnut Creek price. I would still certainly like to know if the parts are truly identical or are merely interoperable.

-Davio

UPDATE: To be fair, on another tread a person with an EV charging malfunction much like mine reports that the diagnostics cost $160 at Tustin Toyota in Orange County, CA.

[alflash]

This is what Toyota of Palo Alto says about the service:

A trained technician will analyze (diagnose) your concern. As a result of diagnosis, an estimate for repairs or additional diagnosis as required will be provided to you. Diagnosis fee does not include cost of parts and/or labor to complete repair. Please address any concerns directly with your service advisor upon arrival.
Disclaimer regarding price: Waived if covered under factory or extended warranty. Dealership will determine eligibility.

As for the part, thanks. Yes, that would save me a few hundred dollars off of the Toyota of Walnut Creek price. I would still certainly like to know if the parts are truly identical or are merely interoperable.
-Davio
UPDATE: To be fair, on another tread a person with an EV charging malfunction much like mine reports that the diagnostics cost $160 at Tustin Toyota in Orange County, CA.

Note that I'm don't discuss the price of diagnostics (it depends on the hourly flat rate labor* of a particular service shop and on the "appetite" of its owner).
My question was what exactly can you get for that money.
Do I understand correctly their answer corresponds to a situation when a patient is tested to find the cause of the disease, but their results are a secret for the patient himself?

* For reference.

[dfergenson]

I'm not sure what information the dealership provides as part of the diagnostic service.

But since they would want to provide service based on the diagnostics, I would assume that they've provide enough information at least to explain what they would do to repair the car and why. Perhaps they'd provide a report similar to the one that you posted.

-Davio

[alflash]

... But since they would want to provide service based on the diagnostics, I would assume that they've provide enough information at least to explain what they would do to repair the car and why. Perhaps they'd provide a report similar to the one that you posted.
-Davio

I would like to hope so.

[alflash]

The Lingenfelter pump manual said to maintain 2 Hz +/- 0.2 Hz. They compare their pump performance to Bosch (and I think that the Tesla and Toyota pumps are actually Bosch) so I figured that, if it was intended as a replacement for those pumps, the same frequency would work.

As for the 50% duty cycle, yes, the pump speed is supposed to vary according to duty cycle. 50% was the middle of the range that they gave in Appendix A for the duty cycle vs. pump rotations/minute.

NOTE: In the Lingenfelter VariMax pump manual, there seems to be an error. On page 5, the pump view and connector view pin assignments should be flipped but don't seem to be. Believe the pump diagram (right side of the page). I've already reported this to Lingenfelter.

You were absolutely right.
And this is shown in this video how such a pump is controlled and how its speed feedback signal
https://youtu.be/6KOJhDqLX4Q