p3030 Code on 2001 Prius Battery that's been replaced

[jp3rks]

I have a 2001 Prius and needed to replace the HV battery. I purchased the new one from a salvage yard. It has approx 42k on it. The guy says it was fine when he removed it from the car. When I put it in my car, I get a p3030 code, which is something to do with a circuit not being complete or a busbar module... basically I think something with wiring inside the battery.

Does anyone have advice? Is it for sure the battery or is there a chance something else causes that p3030 code?

Thanks,
Jonathan

[vincent1449p]

There are 19 voltage sensors that are connected to a pair of battery module and send signals to the battery ECU. Have you measured them? (Standard voltage: 2V or more)
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[jk450]

<div class='quotetop'>QUOTE(jp3rks @ Oct 30 2007, 04:31 PM) [snapback]532565[/snapback]</div>

I have a 2001 Prius and needed to replace the HV battery. I purchased the new one from a salvage yard. It has approx 42k on it. The guy says it was fine when he removed it from the car. When I put it in my car, I get a p3030 code, which is something to do with a circuit not being complete or a busbar module... basically I think something with wiring inside the battery.

Does anyone have advice? Is it for sure the battery or is there a chance something else causes that p3030 code?

Thanks,
Jonathan
[/b]

It's a problem within the battery pack, but it can be caused by root causes other than what Toyota lists in their trouble trees. Even if the service plug is removed, I don't recommend rooting around underneath the sheetmetal of the battery box unless you are pretty familiar with the component.

Where did you get the pack? Any external dents?

[colonel570]

Originally Posted by jk450

<div class='quotetop'>QUOTE(jp3rks @ Oct 30 2007, 04:31 PM) [snapback]532565[/snapback]</div>
It's a problem within the battery pack, but it can be caused by root causes other than what Toyota lists in their trouble trees. Even if the service plug is removed, I don't recommend rooting around underneath the sheetmetal of the battery box unless you are pretty familiar with the component.

Where did you get the pack? Any external dents?

I am having a similar problem P3030 and P3001.

I have replaced the battery ECU with 2 diffrent ones from salvage yards and I still have a problem.

My 01 Prius has an 8 month old battery pack from Toyota at a cost of $2700.

I have the cover off the battery the connections look new on the battery pack cells.

Also when you drive the car and come to a stop the engine starts and stops every 3-5 seconds. odd!

I have replaced the inverter about 2 weeks ago. sigh! I don't know what else to do.

[Patrick Wong]

Have you verified (using an ohmmeter) that the sense wire connections from the battery modules to the battery ECU are solid?

[colonel570]

Originally Posted by Patrick Wong

Have you verified (using an ohmmeter) that the sense wire connections from the battery modules to the battery ECU are solid?

Ok so get this.

I took the service plug out and the negative cable off the 12v battery for about 10mins.

now i only have P3001 and not P3030, I guess im back to where I started before I got the salvage battery ECU.

[Patrick Wong]

Well, it might take a couple of driving cycles before DTC P3030 will reappear (if there's still something wrong with the battery sense wiring).

As you know, DTC P3001 indicates a problem with the battery ECU, but you've already replaced that a couple of times. I think you'll need to obtain the wiring diagram and check the continuity of each wire that connects to the battery ECU, especially those that connect between that ECU and the hybrid vehicle ECU.

[colonel570]

Originally Posted by Patrick Wong

Have you verified (using an ohmmeter) that the sense wire connections from the battery modules to the battery ECU are solid?

My Prius is at the Toyota Dealer im going in a min to pick it up, still broke.

I have a spare 01 Prius battery core.

I have taken it apart and I took all the sensing wires off it.

Now that I have them off how many ohms should I be getting from wire to wire?

I have a Craftsman autoranging multimeter 82139 is that what I need to figure this out?

How do I upload picktures to show you guys what im up to?

[Patrick Wong]

Measure continuity from one end of the sense wire to the other end of the same wire. The resistance should be less than one ohm. (First, short the two multimeter test leads together to see what the resistance measurement is. If greater than 0.0 ohms, note the value and call that the baseline reading. The true resistance across the sense wire will be whatever you measure minus this baseline.)

The autoranging feature sounds like you have a decent meter. I do not know the Craftsman line as I use Fluke.

If you "Go Advanced" you will see a section where you can upload your photos.

[colonel570]

Originally Posted by Patrick Wong

Measure continuity from one end of the sense wire to the other end of the same wire. The resistance should be less than one ohm. (First, short the two multimeter test leads together to see what the resistance measurement is. If greater than 0.0 ohms, note the value and call that the baseline reading. The true resistance across the sense wire will be whatever you measure minus this baseline.)

The autoranging feature sounds like you have a decent meter. I do not know the Craftsman line as I use Fluke.

If you "Go Advanced" you will see a section where you can upload your photos.

Another dealer replaced the battery under warranty.

Same problem and trouble codes. Aparently the old battery and new battery were fine. Is there any way to check the BATTERY ECU? I think this is the problem. I have replaced it with a few salvage Ecus. any ideas?