2006 Prius DTC P3102 troubleshooting

welcome and thank you!

 

Hi,am working at same codes,is hard access to shift control actuator o conector?

 

Thank you so much for posting this. I’m getting the same code and p lock message too. Lol sounds like you’ve dug deep into this issue so I’m going to give your solution a shot

 

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So it sounds like you ended up replacing/repairing a bad connection on the green wire from shifter actuator sensor to transmission ecu but is that something you can confirm worked??

I think this is my issue because I had the same code(s) that brought me to replace a bad shifter actuator because it was literally snapped off leaving it to keep spinning on the transmission. I replaced it and maybe 1,000 miles later same codes you got returned. Codes pop up every 40-120 miles now.

thanks for your help just need to know what to look for when I do pull the harness down

 

Did you have any success with this issue?

 

I assume you have a P3102 set by the hybrid control ecu. What codes are in the transmission control module? What are the INF subcodes? That will determine what circuits you need to focus on in the procedures in the service manual.

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I am on my 3rd shifter actuator in the span of 5,000 miles now.
codes prior went to C2301,40,10 and then normally this round on my 3rd shifter actuator shows P3102, 582 every 40-120 miles now. I have replaced the transmission ecu and checked for bad grounds on the engine with no issues.

I have my mechanic scanner and I do notice on a freeze frame that the the 3 phase readings show the following:
Phase U 0.15v
Phase V 12.96v
Phase 0.31v
which is very off considering all 3 must be 12.00volts and higher.



I also notice my parking shifter learning continues to say NOT GOOD prior to giving me transmission ecu.

So on a live data it looks like I have issues somewhere with the shifter actuator and transmission ecu.

The first shifter actuator for some reason was cracked and replaced but nothing changed.

2nd shifter actuator began giving random codes c2301/40/10 and P3201, 581

I have the repair guide and I am at almost everything it tells me to do with last resort being to replace the shifter actuator AGAIN. If this doesnt fix it maybe replacing the harness might fix it but I see nothing wrong with it nor are the voltages from transmission ecu showing anything.

I have exhausted just about everything the repair guide suggests.

next would be ecu's being swapped out but I doubt that will help

 

part 2.
I also do not always have success using this repair guide and sometimes fix things on my own contrary to what repair guides suggest. There are times it ended up being something else other than what repair guides have sworn to be the issue, I will continue to check things out and replace other components for now.

I am only asking here to see if anyone found something else to be the problem outside of what repair guides are saying

 

Are we talking here about the repair manual where the people who built the car tell you how it's built, or some other kind of repair "guide" from somewhere else?

I agree the internet is awash with repair "guides" that often lead to goose chases.

 

the toyota repair guides. I have had success with the guides but i have also had many situations where they didn't really help at all.

All I'm suggesting is sometimes the repair manual guides don't help. I own 9 of these cars and fix a lot on my own selling a lot more for my business and sometimes I get stuck like with this particular situation.

I am on shift actuator #3 within 5,000 miles and have come to the conclusion that possibly the transmission or a bad ground somewhere is messing up my shift actuators.

I have a lot of experience with the gen 2 and some with gen 3 but this problem is a tough one

 

True, the troubleshooting steps in the manual sometimes call for an active-reading approach: "why are they telling me to test these things in this order, what does that tell me about how the car is built, and how does that help me interpret what I'm seeing, beyond blindly following some steps?"

One of the best examples I've noticed is in the engine disassembly / reassembly steps, where they very carefully tell you to move the crankshaft at least 40° away from TDC before moving the camshafts at all with the timing chain off. They never straight-out say "hey, we built an interference valve train, you need to do this so you don't clobber the valves"; you just have to infer that from what they do say.

 

mechanically the repair guides are spot on and have helped me with engine/tranny swaps.

I think when it comes to electrical or hybrid issues it can be a headache to follow because like most electrical issues it can be 1 of 100 possibilities.

I will drive 1,000 miles with my third shift actuator in 5,000 miles and see what happens.

the next thing to do here would be to replace harness but I honestly don't see anything wrong to call for a new part. I've never had to replace an ecu on any prius I've worked on unless water damage or totally fried due to low 12v battery beating it up.

I WORK ON A LOT OF GEN 2'S AND GEN 3'S HERE IN THE BAY AREA SO IF ANYONE HAS ANY QUESTIONS ABOUT THE CARS FEEL FREE TO MESSAGE ME