permanent P0102 readiness monitor stuck "incomplete"

No bulletproof solution here. My first time reading about this issue. Looks like some get lucky and some don't.
I'm familiar with a few relearn procedures, but not the P0102. Looking in other threads (at the bottom of this page) Reset "permanent" p0102 , 2013 P0A80 error "permanent" and a couple others here at Priuschat
I read some notice a 600 mile estimate before the Permanent - clears for them and others appear to never get it cleared.
Thinking about why the ECU is not getting the info it needs to clear 102 takes me down the proverbial rabbit hole. trim is off, ECU looking for X in Y and not getting Z, VVT, Tech Trix, EVAP / canister / valve, etc.

Have you pulled the MAF plug again or removed the MAF sensor for inspection,
almost misspelled MAF as MAP. Don't know what I was thinking as I typed that.

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Ratchets And Wrenches ->> How to Test a MAF or MAP Sensor With a Multimeter - Plus an Operations Guide

 

Having recently swapped out my EGR cooler I had the water pump code pop up afterwards but also the MAF code too and I never had it before since owning it.

I burped the system of air and the codes finally went away at the same time.

https://plugoutpower.com/

http://projectlithium.com/



Home - Pulstar Spark Plugs

 

Same issue on my lady's Prius C. 800 miles later, still hasn't cleared itself.

 

Maybe, just may be, related:

 

I could not resist. Did you pick up your car and shake it a few times?

I too have the issue, and I think you mentioned it on the the EGR Cleaning Thread I started. I only see it in TS.

 

The Repair Manual (more info) for model year 2011 gives a different detection condition and confirmation driving pattern for DTC P0102. Perhaps this was actually a mid-year change for which Toyota never updated the 2010 edition of the manual.

The updated detection condition now depends on engine speed:

Mass air flow meter sub-assembly voltage is below 0.2 V for 3 seconds
(1 trip detection logic: Engine speed is less than 4000 rpm)
(2 trip detection logic: Engine speed is 4000 rpm or more).​

The confirmation driving pattern adds two steps that aren’t in the 2010 version:

11. During normal driving, increase the vehicle speed to 50 mph (80 km/h) [D].
12. Depress the accelerator pedal fully to increase the vehicle speed to between 62 and 75 mph (100 and 120 km/h) (engine speed of 4000 rpm or more) and then maintain the speed for at least 5 seconds [E].​

(“[D]” and “[E]” refer to a new figure, showing speed over time.)

 

Could someone please post all driving pattern steps to get rid of this code, would be much appreciated.

 

After my engine grenaded at 92,000 miles, I too had this problem. I put a new engine in, thanks to RagingFit and the GasketMasters on youtube.

The best way to avoid permanent P0102 readiness monitor stuck "incomplete" is to remember to plug in the MAF sensor and don't leave it unplugged while the Prius is on. I followed the steps posted by Elektroingenieur and the monitor still reported incomplete after a few tries and driving the P101 driving confirmation pattern. You can check if the monitor ran with Techstream by clicking on Powertrain > Engine and ECT> Utility > clicked on All Readiness, typed in P0102, hit next and the monitor shows a status. I think the monitor was still not running for some reason.

What I did to get the monitor to run again was, I cleared the DTCs. Powered off the car and waited 30 seconds. Disconnected the negative battery terminal for 10 minutes. Connected the battery. Before I followed the attached file with the MAF Low Input Driving Confirmation steps, I also did the ISC Leaning Initialization procedure, which is put the vehicle in maintenance mode and let the coolant warm up to 158F. You should see the ISC value in Techstream change change to completed. This supposedly fixes the Loud Rattle from Hybrid vehicle transmission. I noticed a little difference. I only mention this because it could have affected the P0102 monitor not running, but I doubt it. I then did the MAF Low Input Driving confirmation pattern the same steps posted by Elektroingenieur. Note: I would be uncomfortable doing the steps on a cold engine because of the hard acceleration. The directions say "Depress the accelerator fully". What I did was let the engine be warmed up, idle for a minute, drive up to 50 mph for several seconds, and push the accelerator to the floor **cross your fingers your engine doesn't blow up- I hate this step** and I SET cruise control at 64 mph- a speed that must be between 62 and 75mph. Then I pulled into a parking lot to check if the monitor even completed and in Techstream clicked on Powertrain > Engine and ECT> Utility > clicked on All Readiness, typed in P0102, hit next and the monitor shows COMPLETED! I did another trip or two of the MAF Low Input Driving confirmation steps, powering off the car in between, and did one included universal trip. Reran Health check and the P0102 permanent DTC cleared. Never was a pending or current P0102 present for days/months, this must be true for the permanent DTC to clear.

If you have a library card or college id some institutions will allow you access to ChiltonLibrary free where a recent version of the Repair manual is. After you login, type in your year make, model and the manual showed up. Google ChiltonLibrary click on Access Through your Library at the bottom of the page.