Goodevening everyone

First of all I apologize for my eng Have mercy

For a series of coincidence a parent of mine gave me for free his lexus rx400h ( 2006 model ), I'm not familiar with hybrid cars in general but step by step I'm getting closer.
Mileage is 380k on the clock, the V6 runs incredibly fine, no leaks since the previous owner ran on the highway for the 90% of time so all the services where done every 8k/10k.

The only problem that I'm trying to troubleshooting is on the hybrid battery and in general to the hybrid system.

The symptom:
If I accelerate normally by pressing the gas pedal slowly, the car will quietly reach 160/180 kmh, but if I full kick the gas pedal the car accelerates for a few seconds and then stops, going no further.
And if I keep the gas pedal down, a lot of warning (red triangle) telling me to check hv system , vsc and abs.

For what I can tell, the HV battery is still the original one and with 380k on it and after 17 years... maybe its time is arrived? The only thing I can see is that the capacity of the charge never goes up always stay near to 50% even after 3-4 Km of downhills.

hypothesis:
I checkd with techstream for any codes and I get theese in the pic but noone seems direcly releated to a battery faliure; at this point I don't know if some ecu is bad ( like skid control, HV control, yawrate sensor ) or is the HV battery so bad that sends or mess up can signals to thoose ecus, not give the correct ammount of power in the moment of need.

---

In the end, last week I went to an official lexus workshop and left the car for a diagnosis. They told me that the problem was not on the EV system but on the gas engine. They changed 6 spark plugs, 6 coils and the intake manifold gaskets but when we went to test the car, the problem was still there.

They apologized and left me a courtesy car while they delve into the problem.

Unfortunately, in my area there are no electrician workshop that works on hybrid systems, but according to one of them I approached through a tester told me that " the 12V battery seems to receive too much current when accelerating "

Could it be the alternator? ( I don't even know if the rx 400h has this component )





Mirko

 

1. https://www.clublexus.com/forums/rx-...l#post11120000
2. What did they find? If you got a car for free, spend some money for a diagnosis at Lexus/Toyota dealer. Don't play in "guessing" of the problem.

PS: It looks like an "engine" problem (error with fast speed up), not a "Hybrid battery" problem.

 

I tested the car with that app before taking it to lexus. When I try to press the throttle all the way over 80 mph, the app shows this data

But if I use the car slowly/normal speed instead, no kind of error or abnormality appears on the hybrid system.

It could be a problem on the engine but at this point I don't know what to think, every now and then the check engine light comes on but generic errors come out and I don't know if they can be related to this case

 

https://repairpal.com/obd-ii-code-p0...ailed-to-start