I have a 2008 Prius touring 127K miles I purchased this car with the under standing it needed a new hybrid battery. The car would not go into reverse or drive. I purchased a reconditioned battery and installed it myself. I installed a new 12v battery as well. I go to start the car and I still have the RED TRIANGLE OF DEATH. Upon first start up the engine would not start. I removed the mass air flow sensor used maf cleaner and reinstalled the sensor. The engine then started. The car has the ready light illuminated. It will drive now. I started researching and found about the water leak in 2nd gen cars. Sure enough the white connector were corroded at the black and red wire. I soldered those wires together and eliminated the connector. Still have the red triangle and these codes. I am using a Autel scan tool. I can see the battery temp sensors are all reading. The battery is charging. The car will start and get in “ready” mode. I can command the hybrid battery fan on with my scanner so I know that is working. I am hoping someone here can help. I’m out of ideas as I am very green in the hybrid community.
So now what codes do you have The red triangle is on the door open or you have codes close the door make the autel read the codes?
Is your inverter water pump working but your hand on it and touch it while the car is ready look in the little pink tank next to the inverter take the cap off Make sure it's not overfilled do you see the pink fluid moving just a little bit No? it needs to be
I do not have the codes from before I replaced the hybrid battery. The three codes listed are still present. Having the door of the car open when reading codes will effect the outcome?
The P0AAC is the code that tells the story. It's from the battery ECU. The P3000 is just the HV control ECU saying "shhh, the battery ECU has a story", and the C1310 is just the brake ECU saying "story? did the HV ECU say something about a story?". The story is about the battery 'inhaling' air temperature sensor. You get the P0AAC if the temperature reading is either suspiciously low (which an open circuit could do), or suspiciously high (which a short circuit could do). If your scan tool can show all the temperature sensor readings, you should be able to tell which of those cases you've got.
It's almost like we need to add faces and animations on each of the ECUs... I suspect the rebuilt pack this person is using is just the modules and they haven't looked at the temp sensor wirring harness for damage or inside their battery ECU for corrosion yet. But it may also be that re builder failed to do that on the pack they rebuilt that they sold them, which would be a bad sign on the ability of the rebuilder.
Is that a minus sign? Seems awfully chilly even for Chicago. Weird low readings happen either if the thermistor circuit is open, or if somehow another circuit carrying battery voltage is shorted to it. (If the circuit were shorted to ground, the reading would be weird high.)
The wire connector that is located next to the hybrid fan. What is that connector for? I did solder those connection but I almost feel there was an issue with the black wire the copper was not clean.
that white plug with way less wires than it's designed for? It gets corroded due to leaky roof seams that lead to a puddle in the 12v wheel well.
I don't think that's involved with the inhaling air temp sensor though. All those sensors (the three among the modules, and the inhaling one) are inside the battery case and wired straight to the battery ECU. My guess is the inhaling one is the one with green wires ... that's the one that has a mnemonic in the wiring diagram a little different from the other three.
Tomorrow I will inspect the wiring going to the battery ecu. I opted for a reconditioned pack so I got the whole unit. I am in contact with the battery rebuilder.
Yes I was wondering what those wires did. I have seen a video where the red wire connection was broke and the hybrid fan would not spin without connection. As I mentioned my fan will spin when I command it with the scan tool. I have not seen the fan spin without the scan tool. But why would it spin in the inhaling temp is -87 degrees.
Other than rare instances in super hot weather, your battery cooling fan is primarily a default safety feature used when the red triangle comes up. If there's any corrosion problems with that plug above and behind where cooling fan is located it will show up as a bad voltage for cooling fan error code.
I installed a different rebuilt battery and the red triangle is gone. I did notice my first replacement battery had a red label ecu and the new replacement has a black label ecu.
The (-87°) reading is what the scantool is programmed to display if something in that temperature sensor circuit is "open". The engineers also decided to turn the fan on because if the sensor doesn't work, then the ecu can't know what the temperature actually is. So having the fan turn on is a "fail-safe" mode to protect the battery. Posted via the PriusChat mobile app.
New issue with the Prius. I have codes P3190 , P0A0F. My oil level is corrected it was a 1/4 inch over full line. I have a full tank of gas. Mass air flow is testing correct.
A new thread for the new issue might help, as people will be looking at this thread for P3000, C1310, P0AAC info. Or there might be a P3190, P0A0F thread to tag on to. P3190 means the engine was producing less than a fifth of the expected power at some point. It's a code from the engine control module. P0A0F is from the HV control ECU (kind of the orchestra conductor for the car) saying "hey, engine missed my cue, go ask him why."
