2002 Prius, 141,000 miles. Pictures show what came up on my Mini VCI Showing 3000-123 code and 3030 I checked all the cells withing the HV battery. All are what is shown. Any idea how to remedy block 18?
The code to focus on is the P3030. Check the voltage sense wire, particularly going to blocks 17 & 18. When you say: do you mean you checked them with a voltmeter and they were the same as Techstream showed?
Thank you dolj. I did check the voltage with a volt meter as well. I also check the wire going to block 18. If my count is correct it is red. It looked intact at the connection at the stainless steel plate. I also cleaned the brass plates within the orange wire harnesses on both sides of the HV. Still registered these codes.
You probably need to remove the voltage sense wires and check each one with an ohmmeter using the "wiggle test". Visual inspection doesn't always reveal an internal wire break. Also, are you counting the blocks/modules from the correct end? on the Gen 1, looking at the battery from the back facing forwards (as installed in the car), the count starts at block/module 1 on the left-hand side and goes to block 19/module 38 on the right-hand side. I'm still confused, you measured voltage with a voltmeter on block 17 and got 20 V and block 18 and got 0 V?
Thank you. I apologize I miss typed, the individual blocks on 17 and 18 were 7.5 respectively. That's what had me perplexed. All else were the voltage shown. I did start my cell count at the battery ECU. (left side).
OK, that also most conclusively points to a problem in the voltage sense wires. What you reported just now was what I was expecting.
0 Ohms, and when you wiggle them they should stay at 0 Ohms. If they show any increase in resistance or it goes to 1, then you almost certainly have a broken wire on that lead. And sorry for harping on about this, but do you mean you checked each individual module in each block pair and you found each one was 7.5 V? That is you checked 4 modules (2 blocks – 17 & 18.)
@dolj has said everything that needs to be said and checked at. 1+. Unfold all the voltage wires, linking the modules,and the battery ECU. Check for corrosion on em. Have a closer look at the bus bars too.
No worries, I don't like to always assume, usually it gets me in to trouble. Let us know how you get on.
Replaced the wiring harness in the hv battery. Noticed blackened connection to the battery ECU. Put everything back together and the same codes came up. I am thinking something made have happened inside the battery ECU. There were black/burn marks on the ecu connectors as well. Is there a way to isolate and check the hv battery ecu?
Unscrew the ECU itself and take a look inside it. You might be surprised at the level of corrosion in there. If you can, clean every corrosion in the ECU with electronic spray. If can't, just replace it with another.
A few months ago I replaced a cell and noticed the Sensor Harness was burned/corroded. The mating HV ECU socket was also burned. I took the HV ECU cover off and found corrosion had eaten away one of the pins. It was completely open. Quite the surprise. After replacing the harness, the block and the HV ECU, all was good, again.
Replaced the hv battery internal wiring harness and hv battery ecu. Cleared codes. The following codes came up after all were cleared- P3009 and P3000-123 Any idea what happening now?
