SAE vs. Toyota nomenclature

In the generation 3 you're going to probably wind up down the rabbit hole changing both of the brake parts on the firewall like Toyota recommends. When the stuff starts failing there can be communication errors with other computers in the car just seemingly how it works I don't think you're looking to change computers and that sort of thing I think you're going to find your actuator and the other piece maybe having problems and then that causes the communication issues when they're not working properly or something along those lines Make sure you're using a very capable scanner so you can communicate with the whole can bus system I guess that is pretty important for this model vehicle.

 

There aren't any brake parts wanting changed here. The only codes from the brake system, C1259 and C1310, are the codes it sets when it is notified about trouble codes set for the hybrid system. Those codes will go away when the hybrid system trouble is attended to.

Yes, because that's a U0 code, it falls in the range of codes standardized by SAE, so the wording in its fortune cookie comes straight from SAE. If you had, say, a U1 code instead, that would be Toyota-defined and its fortune cookie would use Toyota wording (but also the same U1 code could mean something completely different in another car).



So the difference between the SAE-standard and manufacturer-defined trouble codes turns out to be not very much in practice: if you're looking at a manufacturer code, you gotta look in the specific car model's repair manual to get the right explanation of what the code means. If you're looking at a 'standard' code, it has a 'standard' meaning, but you still gotta look in the specific repair manual to find out what part the manufacturer chose to use SAE's 'standard' name like Drive Motor Control Module "A" to actually mean.

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It looks like someone will have to go online to look for U0110's full workup section, because there's a big PDF file floating around that somebody made by clicking Print-to-PDF a whole lot of times viewing the repair manual, but the U0110 section is among the ones that got missed.

There are enough other mentions (cross references) of that code in the circulating PDF to make me think that Drive Motor Control Module "A" is probably the MG ECU, located inside the inverter assembly.

But I wouldn't just charge in and replace that ECU. The U codes are communication codes; in this case, the power management control ECU under the dash (which handles both Hybrid Control and Cruise Control) is saying it can't communicate with the other ECU. The cause of the problem could be something in either ECU or in the wiring between them, so it pays to go through the troubleshooting steps and see what's really the root cause.

Regrettably, those steps will be in the section that's missing from the easy-to-find PDF, so a visit to the repair manual online may be called for.

 

FWIW:

 

You've merely attached a page from the summary chart of all DTCs at the front of the "Hybrid Vehicle Control System" diagnostic section. That chart did get included in the big PDF that floats around on the web.

That's enough to see that there are four different INF codes, and what the fortune cookie says, and generous lists of what trouble areas could be involved, and that it turns on the master warning light.

It's not enough to see what the code tells you or how to troubleshoot it. That will all be in the actual section for that code, which, like many of the other hybrid control DTC sections, got left out of that big PDF, and so can only be found by using one of the other avenues for access to the repair manual.

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