P0a7f

 

This is the general deterioration code. The only diagnostics Honda specifies is to replace the battery pack. This is likely the reason the previous owner bypassed the pack. Essentially, you bought a car with a weak/bad pack. The fact that you've already grid charged the pack and still see issues under heavy loads suggests "bad" pack.

What is likely happening is that under load, one or more of the voltage taps drops well below the highest voltage, and the car registers this as deteriorated capacity and throws the code.

Since you've already grid charged once, your only "easy" option is to deep discharge the pack manually with light bulbs.

I'm not familiar with AC power in your region. Are your incandescent light bulbs 110V or 220V rated?

 

Yes they are

 

I asked you 110V OR 220V.

I expected either "110V" or "220V". You said "yes."

Please clarify.

 

Sorry I meant 110v

 

You need to build a dual-bulb discharger like this:



In the states, this represents about $3 in ceramic lamp holders $1 for the board (it has two pre-drilled holes with a metal screen I removed. In Arizona, these are commonly used for attic inlet vents between rafters) and a few $ in bulbs.

The bulbs must be wired in series.

You need to repeat your grid charge checking voltage hourly. Charge until you hit peak voltage and hold for 8 hours. Do not exceed 24 hours total charge time.

BEFORE YOU DISCONNECT THE CHARGER, measure and record each tap. Take the reading and write it down.

Disconnect charger.

Pack master off.

Attached discharger to same contacts as charger. Install 100-250W bulbs (whatever you can get, but they MUST be the same wattage).

Master switch on.

Record Pack voltage at:

30 second
1 min
5 min
10 min
15 min and every 15 min thereafter

Upon reaching 145V, measure and record all 11 voltage tap values BEFORE you terminate discharge. Don't say "about" this or that voltage. Write them down.

Master switch off. Allow bulbs to cool. Install 2X 25W bulbs. Master switch on.

Discharge pack to 132V. This will take awhile. Measure and record all 11 tap voltage WITH discharger connected. If you miss 132V by a bit, that's fine.

Continue discharge to 105V. Measure and record all 11 tap voltages. Again, if you miss, fine, just try to get close.

Continue discharge to 66V. Measure and record the 11 tap voltages.

Remember, 25W discharges will take hours. Allow 24 hours for the whole discharging process.

Master switch off.
Disconnect discharger.
Wait 10 hours.
Measure and record all 11 tap voltages.

Report all tap voltages measured as follows:

1) Taps at end of grid charger with charger attached and charging.
2) Taps at 145V with discharger attached and discharging.
3) Taps at 105V with discharger attached and discharging.
4) Taps at 66V with discharger attached and discharging.
5) Taps at rest 10 hours after terminating discharge.

Please follow my instructions exactly. Do not take shortcuts. This makes it much easier to help you.

Thanks,

Steve

EDIT: NOTE! THE IMA COVER NEEDS TO BE INSTALLED WHILE GRID CHARGING TO ENSURE THAT THE FAN CAN COOL THE PACK. PLEASE CONFIRM YOUR GRID CHARGER POWERS THE FAN.

 

In fact, to ensure you grab the right data, I made a quick sheet here:

https://docs.google.com/spreadsheets...cfA/edit#gid=0

If you PM me a gmail ID, I will share it with you, so you can edit it yourself.

Steve

 

Thanks Steve

I will do as instructed

But not until Friday I will be able to do that

 

makes sense. Are you at least getting 12V charging now?

 

Yes I'm getting 12v charging

And thanks for the sheet