troubleshooting beyond the bland C1259 and C1310

C1259 and C1310 are codes that are set in the brake/skid ECU, and all they mean is that the brake/skid ECU knows that there are codes in the HV control ECU and/or the battery ECU. (I don't know exactly what car you're talking about, because you haven't said, and your profile says "other non-hybrid", so I'm kind of answering for a Gen 2 because you posted in this forum.)

A "C1259 and C1310 without other codes" story almost always means somebody is using a generic scan tool that shows codes from the brake ECU, but doesn't show the codes that matter from the other ECUs because it doesn't know about those.

However, if you are actually using Techstream and its health check doesn't show you any codes under Hybrid Control, then something else is wrong, say, Techstream isn't able to communicate with those ECUs for some reason. Can you post a screenshot of the health check results?

 

Your health check is only showing results from seven ECUs. There are around a dozen in the car (still assuming your car is a Gen 2 Prius). The ones that aren't showing up here include the engine control module and the hybrid-vehicle control ECU.

Those are kind of big deals. Your car has a network communication issue of some kind. The sections in the repair manual on "multiplex communication" and "CAN communication system" will have the information needed for sorting that out.

Toyota Service Information and Where To Find It | PriusChat

 

Unlikely that this will solve you current issue(s), but given that the 12v connection was removed, it would be best to clean up the MAF, butterfly valve, and surrounding throttle body area. Use a toothbrush and vodka/iso on the throttle body/butterfly, then MAF cleaner on the MAF sensor.

You may be able to skip the MAF cleaning if it has been cleaned recently or if the vehicle has lower mileage, how many miles on the vehicle?

Have you had a chance to look up the above OBD2 codes (DTCs), and were you able to go through the workups step-by-step?

 

The OP is mostly only seeing the codes that say there are other codes.

The codes that matter are the ones that aren't showing up, from the ECUs that aren't even showing up in the Techstream health check.

That's its own problem worth solving, right there.

 

i think you click on the snowflake

 

The step by step workups are contained in the factory repair manual, use a known DTC and the advanced search feature in the gen2 forums for the needed links. If you have trouble finding the workups, someone (including myself) will likely post them for you.

At 144k, clean up the butterfly valve, including throttle body that surrounds it, and the MAF as well. Then you won't have to worry for awhile.

When techstream offers a code (DTC) with a snowflake to the left of it, click on the snowflake to find/locate the related 3 digit subcode (AKA : detailed code, or INF). Knowing any related subcode(s) may help in isolating and potentially fixing the issue in a timely manner.








Since you've reported recently seeing P3000 and U0100 (both could have related INFs), it would a good idea to start there by checking for corrosion on the HV ECU connections (male/female), and the voltage sense harness (wire frame #2) the connects the modules.









If those look good, then take a peak inside the ECU and look for internal corrosion or whiskers :







Be sure to clean the HV battery fan, and the related connections as well :





The patina showing on the connectors below is corrosion :




Notice the broken pin in the connector below :

 

Actually, that B1210 is interesting. It's a code saying that the gateway module has lost communication with the power source control ecu. When you push the power button twice, what happens - what lights up on the dashboard?

Your health check should have reports from 16 ecu's (possibly 17 if you have navigation). You are "missing": ECM, hybrid control, HV battery, SRS,occupant detection, power source control, transmission control (parking pawl), cruise control, and smart key.

One of my first checks would be to use the power button to switch to "ignition on" mode (with a battery charger connected to keep the 12V system voltage up) then check every fuse in both fuse boxes for power and that none are blown.

Posted via the PriusChat mobile app.