2005 won’t start long story

So you bought the inverter pump the one on the gold bracket that goes right under the headlight basically from the Toyota dealer it's a Toyota part?? If so generally that's a real pump and they don't generally fail so I find that pretty interesting that they're saying a Toyota pump failed and they're replacing a different inverter pump there is a pump right up there next to the break actuator and the other brake part on the firewall where your foot touches there is a little pump up there I think it's rated 14.4 volts looks like a mini spa circulation pump and there is another one right in your left front fender at the coolant recovery tank or coolant storage tank this beautiful stainless steel tank that's behind your fender liner and behind your fender on the left side there's another pump that looks like the other one near the brake parts down in that fender so I don't know which one they're replacing I would find that kind of suspect because those two pumps usually last the life of the car upwards of 200,000 near 300 possibly more One guy has 600k on his and I think those pumps are probably original. So it's interesting by looking at this bill or whatever I don't see any part numbers that they're applying or whatever is going on for $800 here I'm on a phone so I have to look at this and try to pinch and squeeze and blow it up and read all the hoo ha.

 

there have been a spate of black market aftermarket pumps that fail in a short time

 

the hybrid inverter pump is the only inverter pump. so they are saying the one you changed isn't working.
you can check the reservoir for movement if you can turn it on as you did before.

then they are saying more diagnosis will be needed, but i don't understand what they mean. if something else is wrong, they should be getting trouble codes

 

"After replacement, will need to proceed with further diagnosis"

A dealer busting out the parts cannon huh? Or maybe they're not interested in working on a 2005 car and this is a PFO...specially if they didn't bother to pull codes..

You got any good independent shops you can take it to for a second opinion?

 

wow $800 for a cooling service!

looks like a parts cannon approach, I run away from this stealership. What a waste in $$ for diagnostic. That pump rarely is the reason for a no start condition. They just run their scanner, see the codes and voila! money codes!! no further checking required. Next car..

 

There might be a bit of confusion here. The inverter water pump isn't connected to the heater working. The heater uses coolant from the engine, a separate system.

The inverter water pump does have an indirect connection to the A/C working, because it cools the inverter, and the inverter powers the A/C compressor, so if the pump fails, the inverter may overheat, and if it does, it may shed the power to the A/C, and then the air blowing won't be cold.

The pump situation in a Gen 2 is confusing because there are four water pumps in a Gen 2, three electric and one belt-driven. There's only one for the inverter, and the other three are all for the engine cooling system and heat. One of those is kind of near the inverter though. People get mixed up a lot.

Did the dealer give you any paperwork with the part number of the pump they're proposing to replace?

 

Either someone at the dealer is lazy, or they're not giving you the full story. Yes, if the inverter pump failed then the inverter can overheat, turn on warning lights and shutdown.

I would expect certain codes to be present if this was the case. I would also expect the car to power on and drive once it cooled off- until it got too hot again.

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Yes I can drive my car gently on a 95° day with the sun out and I can go a hundred miles with the inverter pump not functioning at all and when I get to where I'm going or running my route I generally lift the hood and touch my inputs and outputs of my inverter and rarely have I ever seen or felt much above 105 108° . I drove like this for a week running service calls in the summer time never a problem and then I took out of another car the little spa circulation pump looking thing in between the brake actuator and what I'll call the master cylinder which is connected to your pedal I took that pump from another vehicle moved it to my vehicle where the inverter pump goes left the original bracket for the original inverter pump sitting there and everything but in this 14.4 volt rated pump and it's been working now for over a year or close to it and works very well I'll be surprised at this pump ever dies well kind of surprised anyway and the one I've taken off and put on my car has 200,000 mi on it from another vehicle it's just the way the pump is built and designed it's a tried and true type of design not this flat pancake thing that somebody just came up with or whatever happened with that.

 

The symptoms certainly point to an inverter pump failure. Every one I've seen fail has failed electrically. Sometimes they can load the circuit down enough that it doesn't blow the AM2 fuse, but drops the voltage enough to affect the other systems in the circuit.

Just unplug the pump, replace the AM2 fuse anyway and then drive the car and see what happens. Just keep in mind that if you go highway speeds, you'll likely make the inverter warm enough to code. I think my local Toyota dealership has these pumps for like $140

I was wrong, it's $124 (item number G902047031)
INVERTER COOLING. 2007 Toyota Prius Hatchback | Jim Hudson Toyota, Irmo SC

 

May that is a good deal. My local stealership it was $183 out the Door. But when you are down one..You gotta pay for speed. This was on my wifes car and was back when she commuted 100 miles round trip everyday.

 

can you give us the 12v specs?

what happens when you put your foot on the brake and press power?

 

keep in mind, >12v may not be enough. my 4 year old battery is 12.8v

 

Did you unplug the pump, replace the AM2 fuse with a new 15 amp fuse and then try to start it? Just trying to take the pump and wiring out of the circuit and ensuring the AM2 fuse is good, before sending you elbows deep in more difficult stuff.

If this fails to change anything, you may have a power source ecu problem. There are other threads on the forum about that.