2008 getting P0a93 after inverter pump replacement

Replacement inverters are cheap and just a couple hours of work to R&R... There's plenty of salvage vehicles available. I have 3 Gen 2 inverters in the shop as 'just in case' items. I think it's great the guy is taking care of the problem (hopefully)....reputation is everything..

 

P0A93 can be things other than the pump, tho. It has two possible subcodes. 346 and 347.

346 designates it as a likely cooling water pump system problem
347 designates it as a likely cooling fan circuit problem.

But of course, either one may be triggered by any of the combined causes, including the inverter.

Hope they get it solved for you.

 

What can be done to solve the circuit fan cooling problem? Just had my coolant inverter replaced.

 

@jewellrunner and @Thomas Wesley Heard, referring back to the OP, it could also be a blockage in the inverter cooling fins inside the inverter. Less likely for jewellrunner as the whole inverter was replaced, but it is feasible the replacement inverter was clogged as well (maybe the reason it was changed out). Blockages are most often the reaction caused by mixing and matching different coolant formulations – even if they are the same color even! If you (not necessarily directed at the posters) are using a different brand of coolant, drain the entire loop and flush, before installing a new brand of coolant.

It would pay to eliminate a blockage as a cause though.

Another poster here had a clogged inverter and manage to unclog it enough using water pressure from a water hose (in both directions alternately) to get the system to stop throwing the P0A93. He reported a gritty black sludge coming out.

Just a thought.

 

See the inspection procedure below:

Inspection Procedure | DTC P0A93/347 | Inverter Cooling System Performance

For step 6 - INSPECT COOLING FAN MOTOR (See page 16–8) use the attached pages CO-3 ff.

 

How can I tell when the code pops up if its /346 or /347? Does the OBII say?

 

Those are information codes that display to help with further troubleshooting and narrowing the cause.

Techstream will have them and some more advanced readers might (like an Autel).

Good luck and keep us posted .

 

You can check pump and circulation just open the cap of the inverter reservoir look inside at the coolant should look like it’s boiling meaning aggressive pump action. If it’s tepid movement or just sitting there you either have an airlock Or new pump is not a denso pump or the inverter aluminum cooling channels are clogged. Pump could be dead to as when the previous pump failed it ususlly blows fuse am2. If the nverter system has an airlock you may be able to hear the pump making noise as it circulates airlock.

Get an Ir thermometer and do some tests a happy inverter coolant system should be 70-80 degrees cooler than the engine.

Also since the inverter coolant shares the rad make sure the rad is full and engine not running hot.

Take black plastic cover off the top of the rad take the rad cap off coolant should be right to the top of the cap. If rad low you may have a leak check fir engine water pump leak. Neither the op or the hijacker could post there mileage.

 

The readings I got

Car Scanner ELM OBD2
DTC report
Selected brand: Toyota
VIN: JTDKB20U473265191

============1==============
P0A93
Raw code: 0A93
ECU: 7EA
Status: Confirmed
OBDII: Inverter A - cooling system performance
============2==============
P0A93
Raw code: 0A93
ECU: 7EA
Status: Pending
OBDII: Inverter A - cooling system performance
============3==============
P0A93
Raw code: 0A93
ECU: 7EA
Status: Confirmed
OBDII: Inverter A - cooling system performance

 

If you have a good scanner you should be able to drill down into the freeze frame data which is where you will find the sub-codes (aka detail codes or INF codes). If you can't get to the freeze frame you will just need to check both. Looking at the pump first and verify that is working and you see vigorous movement in the inverter coolant reservoir. If that looks ok, move on to the diagnostics for the fan and cooling radiator.

 

Today I drove about an hour in hot weather (90 f) and I had the heater on the whole time
No codes popped up
Does this mean anything? Other than something’s overheating

 

Yikes! Or do you mean the climate control cooling you? If you did indeed have the heater on, was it blowing nice and hot?

It could mean you did have some air in your system but it has now shifted and no longer air-locked. You could verify this by checking the level in the inverter reservoir. If this happened, the level would be lower and it may need a top-up.

Not sure I understand your meaning. Why would you think something's overheating if there are no codes?

 

I’ve gotten the p0a93 code every time I’ve driven in the heat, which is at least 90 f, every time. Tried blasting the heat yesterday and it didn’t set the codes. and yes heater was nice and hot.

 

What does the car's heater have to do with the inverter pump issue? The cars heater heat is coming from the engines radiatorr just like any other car.

The inverter cooling system is completely separate its designed to cool the inverter and the trans. has nothing to do with cabin heat..

Please read my earlier post and do what I suggested. takes 5 seconds to do. look at the inverter coolant in its reservoir. i bet its just sitting there not moving when the car is in ready. Pump fuse AM2 is probably blown.One of the most common prooblems on a prius there is.

 

Back in August 2020, I was driving my 2008 Prius at 70 mph down a freeway when the car shut down and the dash went dark. I managed to coast to a corner store where I looked for blown fuses. The AM2 fuse was blown and through a quick search, I discovered that the Inverter pump was shorted. I unplugged the pump and limped the 30 miles home. I got a pump through Advanced Auto and replacing it was easy. So, for 4 months the new pump worked fine until I tried to take the car on a short trip. The triangle of death popped up, the cruise control shut off and the A/C quit. I carefully drove back home, about 35 miles, and put my OBDII scanner on the car. I got the P0A93 code. I looked into the reservoir and there is no movement at all when the car is started. I hooked a multimeter set to read amps to where the inverter pump relay is. The pump made a loud whirring noise but still no movement in the reservoir. The meter read a steady 4.15 amps.

I want to replace the pump. I am going to check to see if the pump isn't clogged, although I don't see how as the coolant is clear.

 

Your much better off in the future starting your own thread instead of tagging into a months old post.