2002 Prius P3000 & P3030 Codes

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?

 

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?

 

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.

 

Most certainly a sensor harness/plug issue, ecu plug receptacle or ecu failure.

 

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.

 

Wrong thread.