hi everyone, my name is John and before posting this thread I read around the forums. I have a first gen 02 prius with 111k miles. Codes p3006 and p3021 show on a OBD reader. I did some scans and search and found the damaged blocks and voltages including resistance. From looking at these voltage and resistance numbers, which blocks should I replace? I'm not too sure on the numbering system for them.
Your block 11 is causing the p3021. Notice it's 1V lower in one shot and about .4V higher in another shot than the others? There's a very good chance that you have other modules with very diminished capacity in your pack. In all honesty, the 1st gen modules have pretty much lived a good life at this point in time and are ready to move on to their resting place. I have went through 9 first gen packs now looking for 4 good modules to go with the 34 decent ones I have and have not found 1 single good one! Zero out of 342! I believe you'd be time and money ahead to retrofit the whole pack with either 2nd or 3rd gen modules and recondition them if you want to DIY. Or you could buy a pack already refurbished.
For Gen I Prius 2001 to 2003 the blocks (pairs) are numbered starting at the ECU. I concur. My Gen I is running on modules with 2000 mAh capacity. It's likely that your pack is just as bad. I have a few spares in the 2000 mAh range. Let me know if you want to buy a couple. That's the cheap fix. The real fix is a new pack from Toyota. Brad
Thanks for the reply guys. I know that there may be some damaged modules, so I'm having a guy come out and help me do it so I can learn as well. I'll keep you guys updated. What I didn't mention was that the check engine light is on, traction light, and the hybrid battery on the touch screen. Also sometimes when I would drive it during this condition, during some higher speeds the gas would rev and the brake light comes on.
You are not listening. Replace the one bad module and be ready to do it every few months. Or, buy a new pack from Toyota. The vast majority of Gen I modules are so far gone they will not respond to any reconditioning. This is what you are up against.
There is a vast amount of info here on how to recondition the modules if you're up to the project. The easiest way is to buy the kit from Hybrid Automotive. It's even listed here in the Shop section I believe. It takes about a week to do a complete battery, and you will need some spare modules to replace the failed ones with. If that's not your idea of fun, you can buy one already reconditioned or even a new one from Toyota.
Unless you only have time and no money you are wasting your time trying to revive gen1 modules since you'll be "whack a moling" the car months from now. After 15 years, the modules are done. Toast. Finite. Get the idea? Best option is to get a BRAND NEW "ZERO MILE" battery from a Toyota dealer. Even the people refurbishing Gen1s with gen2 modules are having troubles since gen2 modules are now getting old. Yes new is the most expensive, but you get what you pay for.
I definitely agree. No use messing with any 1st gen modules. And the older 2nd gen modules, with high miles are getting pretty used up as well.
