Park Lock Malfunction

Greetings. I picked up a 2006 (yeah I know) but it was only 1000 so its whatever.

I knew the mfd wasnt working so its stuck on full ac. I already knew how to fix that.

Ride home the triangle came on with the park lock malfunction message.

I got home, reset it and it restarted and went back into park.

The 12v appears to be a newer advance battery. I'll pull it tomorrow and check the voltage.

Anything else? Mfd and error code not related or are they?

 

The 12v was brand new. Had it tested and load tested 12.5-12.6 which was only a hair off their brand new ones. They said its definately not the 12v.

I'll put it back in and see what happens. I could never get my mini vci software to work so I guess it may have to goto the dealer.

 

I have a regular scanner but it doesnt do the prius I dont think.

I drove the car all the way and took the battery out to get it tested.

The battery is still out now because I removed the mfd but couldn't find a replacement yet. I wanted to be able to use the diagnostic mode on the screen.

I got the mini vci a couple years ago and it came with a mini laptop disk and I didnt realize my laptop doesnt have a drive. None of the downloads I tried could get working without the passcode or something I dont know.

The only other thing I could find was maybe the transmission relay. If I can find a mfd I'll grab another relay and hopefully get lucky replacing everything at once.

 

Ok. So I found a mfd that was 47220 instead of 47210, the donor car has nav and mine didnt. I swapped them and they were both compatible minus the data feed plug.

Put the new battery back in and the park lock malfunction came back on again. No codes, not with the regular scanner anyways.

So I meant to grab another white relay but I didnt want to experiment taking one out for the first time since I'm not sure how its attached.

Anyone familiar with this? Nothing helpful on youtube in terms of a visual walkthrough.

 

I was able to get a master relay from the same donor car as the mfd.

I got back and put the "new" one in. Did the beltloop around town and no lights.

Stopped at the grocery store and when I put it in park in came back on, so I put it back in gear and drove to toyota.

I pulled up to the service door, put it in park and it worked still. Turned the car off, back on and the light went off so I drove back.

Really strange but I'm guessing it was definately the relay and possibly something mechanical as well but as of right now it is working.

 

Ok. So the lights stayed off for 3 days. I drove about 3 hours away no problem.

On the way back the abs brake pump thing started buzzing every 30 seconds. Then the park lock malfunction came back on and the brake pump stopped excessive cycling.

The lights are the hazard triangle, vsc and exclamation circle.

Could it be the brake pump?

I really dont want to go back to Toyota after having already been run around by them before.

 

Codes are: C2301 and P3102.

I'll check the negative ground next. So far I have tested the battery and terminals, replaced the mfd, replaced master relay, checked p con circuit.

I'm guessing now either the wiring to the actuator or the actuator itself, which I can not find anywhere for less than twice the cost of a whole transmission.

 

Maxidas tablet. All those sub codes I guess would be useful other than they all read the exact same causes.

 

After extensive research I was able to narrow it down quite a bit.

No bad connections in trunk or related battery issues.

P con circuit under the hood is displaying proper voltages at all terminals and connections.

Checking the tcm connections all seemed to be displaying over 12v which was comparable to all connections in that area. However after reconnecting the tcm the first time the codes were cleared, after subsequent reconnections the codes stayed on.

I ordered a new used tcm for $14 on ebay. I also have access to a parts prius but wanted to get a verifiable correct part # and try both if necessary to rule it out.

That only leaves the actual shift actuator itself, so I will try to pull that one from the parts prius if possible. Hopefully all this will save a $1200 dollar visit to the dealer. As of so far I have spent under $100.

 

I was saving it for last for that reason, time and money. I read in another thread it is accessible through the wheel well. So if I am able to get one out that way I should be able to get it back in, hopefully.

 

Installed the new tcm. No luck.

I crawled underneath to get to the actuator. 2 out of 3 bolts are fairly accessible. I was able to loosen those in no time.

The third bolt on the top is the beast. Its one inch from the steering column. I tried for a few minutes but the wrench kept falling.

I got a better angle with my left hand but no coordination since I am right handed.

I'll just have to keep practicing.