Performed Linear Solenoid Calibration, stopped it mid calibration and received codes C1203 & C1345

Hello,

Longtime lurker here. I've owned my 2007 Prius now for a few years and have arrived at that point where the Actuator needed to be replaced. I did my research here, watched plenty of videos and replaced it just a couple of days ago. Using Techstream, I went through the procedure today for bleeding the brakes after an actuator replacement. Selected actuator replacement, bled the brakes and everything went well. Then, according to techinfo.toyota, it directed me to clear the DTC's (which I did), then perform Initialization. I printed the initialization document off from techinfo.toyota and followed that. They never refer to Techstream, but simply to an "intelligent tester".

The first step had me perform a Reset Memory, so I did that step. Then, it said to turn the power switch off, then back on to perform Initialization of linear solenoid valve and calibration. Techstream had me turn the Prius off for 3 seconds before turning it back on so I followed those instructions. Next, I performed the linear solenoid valve and calibration in Techstream and it said that the test would take 120 seconds and not to hit the brake pedal. The ABS light was blinking quickly the entire time the test was being performed.

While this was going on I was reading the techinfo.toyota printout and it said that the light should change from blinking at 1 second intervals to 0.25 second intervals. My test finished in Techstream and that never happened. Techstream said I was done, but the techinfo.toyota document differed from Techstream in this so I assumed something was wrong. I then reset the DTC's again (there were none this time), and began the initialization again.seeing that the ABS was not flashing correctly this time again, I just ended the calibration before it was over. This is where things went wrong. Now I have the dreaded Red Triangle and some new codes. Those codes are:

C1203 engine control system communication circuit
and
C1345 not learning linear valve offset

I tried the test again to no avail. Someone on the forums said they went through the brake bleeding process (the one where you select 'replaced accumulator') and that fixed it. So, I tried that and it didn't work for me. I feel like stopping that calibration just bricked my new Actuator assembly. Does anyone have any advice on how to proceed from here? My apologies for the long rant and thanks for any help/advice.

 

Thanks for the replies. I haven't tried to drive the car since this happened because want to get this thing out on a road until I had everything in with no issues. So, I'm unsure of how the brakes perform while driving. When I performed the linear offset the first time, Techstream didn't pop up any errors and everything seemed fine with no communication errors or codes. After doing the step again, then stopping halfway is when all the codes appeared. The actuator isn't even going through the steps of calibration when trying the calibration. That's what made me think something happened to the Actuator.

I can't imagine how any of the parts replaced would have disturbed the skid ECU. I installed the Resistor that came with this Actuator under the dash, replacing the old one. But it's located on the far left side in the corner and the Skid ECU is under the dash beside the center column, so I can't see how I could have disturbed that in any way. Not saying that's not possible. Maybe that had a connection running across to the area I was working in and my hand bumped it while installing that resistor. I can check there as well as all the connections and see if something happened between the first and second calibration. Maybe one wasn't completely snapped in or something, but I'm pretty sure they were all secure.

Good reminder on filtering out the Gen3. I try to make sure it's all Gen 2 stuff, but sometimes it's a little unclear.

When searching for where the Skid ECU was located, I ran across a post similar to mine that had this reply:

I didn't see anything regarding the Skid ECU or putting it into test mode during the initialization step. Could this be something to try? I'll upload the Initialization sheet from my model year Prius that I downloaded from the techinfo.toyota site just so you can see what I was following. Thanks for the replies and insight.

 

Just an update for anyone who reads this post. The 12V battery dropped just below 9V after doing the calibrations and that is what made it unable to perform another calibration when I attempted. I charged the battery this morning and it calibrated just fine. So, thank you for the input, looks like this one is solved.

 

I did have a charger on the 12V when I was doing the bleed procedure. I had disconnected it after that was over and didn't try the calibration until the next day (it was late in the day when finishing with the bleeding process).