Not Starting or No Ready

Have you checked your 12 volt battery? Weird stuff happening? MPGs dropping? Test The Battery | PriusChat

Wait until the car has sat overnight or for MANY hours. Please state the voltages at each step.

 

Define "fine". What are the voltages at each step?

 

P0AA6 is a 'hybrid battery voltage system isolation fault'. The car will drive normally until you turn it off, then it won't go into READY. It indicates that the car thinks that there's a possibility of shock from the HV battery, because there was an unexpected voltage drop somewhere in the system.

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Read more: http://priuschat.com/threads/transaxle-failure.58920/​

 

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The air conditioner compressor has an electric motor and is powered by the inverter. Since your mechanic believes that the AC compressor has the ground fault, he asked you to drive the car for a few days without using the AC, to see whether the P0AA6 DTC comes back.

If that fault code does not reappear then that is evidence that your mechanic is right. If the fault code comes back that is evidence that some other component exposed to high voltage has the ground fault.

 

Assuming that the AC compressor has a ground fault, you will need to replace it. The electric motor within probably has a winding insulation failure causing the problem.

By the way, I'm impressed that your mechanic was able to figure this out so quickly - I don't imagine there are many Prius in Pakistan.

 

Have you had any work done on the air con "gas top up or refill" if so this could be the problem if the wrong oil was used. Oil should be ND11 and nothing else.

If the wrong oil was used a flush and refill may work but not guaranteed.

 

No ND11 oil is a special oil for the Prius and "other hybrids" air con system, if the wrong oil is used or even possibly equipment that has had other types of air con oil can contaminate the Prius system.

The problem is that the oil used basically must not conduct electricity, if it does it conducts electricity from the compressor motor windings to ground "the car body" this then causes a fault code to be output as in your case.

I would take the car back to the place you had the work done and get them to correct it or pay to have it corrected by someone that knows what they are doing.

Although a flush and refill may work it may not, then it will get very expensive very quickly with possibly the whole system having to be replaced.

The oil is available in small quantities from a company called Interdynamics.

John.

 

You can try to have the system purged of refrigerant and compressor oil, and install the correct refrigerant and compressor oil (which is pretty expensive by the way.) However it is likely that the evaporator, condenser and compressor will all have to be replaced since they are all contaminated - so this may be a case of pouring more money down the drain without return.

 

Get him to drain the system as soon as possible and refill with the correct oil, to see if this cures the problem. If it does all's well and good, if it does not do it again.

If that does not cure the problem the compressor, condenser, and evaporator will all have to be changed.

I have the manual for the system but for some reason I can no longer attach files to posts. Keep an eye on hear and I will keep trying.

I seem to have after 600 posts become a new member.

John.