Prius (Gen 1) :: OBD Scanner From ECROS Won't Run
Sep 6, 2010
I purchased a Gen I prius (non running) two years ago for a very low price and kept it in dry storage. At the time it threw a P3125 code on the ECROS scanner and would not start.
I finally have the non-running one in my own garage and am trying to get it running. The HV battery has been charged to 285 volts by a DC/DC converter I built. Last year the car would power up the ECROS OBD scanner and throw a P3125 code and I could hear the main HV Battery relay connect then disconnect. Now when trying to start it the 12 volt systems work, the OBD scanner from ECROS will not run, it has power, but no data - no OBD signal I guess, and no HV contactor noise either. I took the Vehicle ECU out from under the passenger carpet and replaced it with a good one from one of our daily drivers and still no OBD signal. I have checked all the fuses and no blown ones in any of the three fuse boxes. With the used Prius ECU in the daily driver, the OBD does work, the daily driver does not start, but no error codes.
Why does the OBD II not fire up the ECROS scanner in the broken Prius?
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Scanner found u0293,,,recommended reseal power inverter. what I have read for two days says its Power source ECU.. What happened,,,kids was driving car, had 3 phones plugged in, ac, lights, and when she tried to set cruise, car went into limp mode, gear lights flashing,,,went into neutral,,,stop beside highway,,had to be towed.
12 volt battery charged and tested ok. no blown fuses. I reset ECU by jumping pins 14 and 4. no change, tried master reset by holding brake and power button down, no change..removed ecu fuse to reset, no change.
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I've been searching a way to read my check engine code WITHOUT a scanner (scan gauge etc...). I have a 2008 Prius and given that there is a lot of things that we CAN program just by presets, it would be surprising if there wasn't a way to read the error codes by some keypresses. Heck, in reality there should be a page on the MFD that just shows the error in english.
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The Prius has 115ooo miles. It is a 2005. Just recently it started showing the red triangle of death, check engine light, and the brake light. When I check for codes using a scanner it comes with the following:
P0A80
C1310
C1259
P3015
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My Prius has started throwing the code P0A80, it all happened after I went away for work and left the car in storage for 15 days, during that time I left the OBD scanner plugged in and it drained the 12v battery, a quick jump start and it was back up and running.
While I was backing it out of the driveway the warning triangle came on and the MFD said "problem" the scanner showed the P0A80 code. I thought that was odd, but maybe related to the flat 12v battery and self discharge of the traction battery so I reset the code, it drove normally to the shops. When I restarted it and started to drive it threw the same code again.
I then installed techstream on my laptop to try and get some more in depth answers but was having trouble getting that running on Windows 8. So overnight I disconnected the 12v battery and would try again in the morning.
I got techstream working and connected it up to the car, connected the 12v and started it. While I was configuring techstream to graph the pack voltages I noticed something odd, the engine was being loaded and unloaded in 2 second cycles, and at the same time the inverter was whining as it does this. I was thinking maybe it's doing some sort of charge and measure cycle since the ECU's have lost any pack data due to the power loss of the 12v battery?
It ran like this for 20 mins or so and the engine stopped, techstream showed pretty normal cell voltages, I couldn't see any wild differences between the cells.
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Searching on google, i found that the reason could be the aftermarket radio, but I am not sure about that, the connections are seen aparently fine. I Read in one thread that disconnecting the aftermarket radio harness is enough to can read codes from computer.
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The fact is that I don't want to get in troubles with the harness of radio, I don't have tools like multimeter neither knowledge about electrical systems, i just want to know if disconnecting the radio harness is enough in order to read codes. (in case of the problem be on the K-line wire).
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Link to OBD2 : .........
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