Codes P043E, P043F, P2401, P2402 and P2419

Tiny
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Hello, it has been a while, did you have success with the repair?
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Wednesday, January 4th, 2023 AT 10:29 AM
Tiny
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Hello.
I'm comeback again.
I have changed a new evap assembly for my vehicle.
All code have dissappear. And fuel consumption gauge have raised to 26 mpg for only one day and it then decreases to 15 mpg.
I need your help to know what's the problems in my vehicle.

Thank you so much.
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Saturday, May 27th, 2023 AT 12:06 PM
Tiny
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Hello.
I'm comeback again.
I have changed a new evap assembly for my vehicle.
All code have dissappear. And fuel consumption gauge have raised to 26 mpg for only one day and it then decreases to 15 mpg.
I need your help to know what's the problems in my vehicle.

Thank you so much.
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Saturday, May 27th, 2023 AT 12:13 PM
Tiny
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26mpg at the same day when I changed evap assembly.
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Saturday, May 27th, 2023 AT 12:36 PM
Tiny
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All sensors live data.
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Saturday, May 27th, 2023 AT 1:33 PM
Tiny
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This data is just at an idle not even moving, I see 1 DTC at the top, what code is it?

The Calculated Load is very high for idle, 57.25%. The Barometric pressure is 78 kPA which is around 11psi that doesnt look right. And the biggest worry is the Catalytic Converter temperatures, 800 degrees F at the inlet and 480 degrees at the outlet.
As well as the OBD2 voltage reading there is low, 12.3-12.7, but that might just be a Toyota charging strategy at idle.

But the Calculated Load almost looks like the Catalytic Converter might be failing. Is the vehicle sluggish when taking off? The Calculated load should not be that high just sitting at an idle. I saw a couple places where the Mass air flow sensor was reading low, but would jump back up.
Let me know if there is a code stored, the proper way to test the Catalytic Converter is to remove the front Oxygen sensor, and do a back pressure test at the Oxygen sensor hole. Remember that the Evap system was not working correctly for awhile, and a rich running engine is what causes Converters to fail. If those temperature readings are correct, 800 degrees at the inlet and 480 at the outlet is way off.

But doing a back pressure test at the front oxygen sensor hole with a vacuum gauge that can read some positive pressure, (most can read up to 10psi for positive pressure). and taking a reading with the vehicle idling, and then rev it up to 2000rpm. You should have no more than 1-2psi at max for a back pressure test. Really there should be almost no back pressure. But I think youre going to find a high reading, The guide below will help with testing.
Just dont stick the rubber section of the vacuum gauge into the exhaust and melt it. Try to put some kind of adapter on there that wont melt, and you only need to get a quick reading.

If you start the vehicle, stick the vacuum gauge on there for a second and its reading a few psi, rev it up real quick, see what it reads and youre done with the test, I have heard of people sticking the rubber adapter of a vacuum gauge into the exhaust hole and it melts the vacuum gauge and adapters, dont do that.
Here is a diagram of the exhaust manifold below with the location of the front Oxygen sensor(Air Fuel Ratio Sensor).

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
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Saturday, May 27th, 2023 AT 4:04 PM
Tiny
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Okay, thank you.
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Sunday, May 28th, 2023 AT 1:04 AM
Tiny
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Today's drive cycle.
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Sunday, May 28th, 2023 AT 8:07 AM
Tiny
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Okay, the numbers look pretty much the same as yesterday. At some points I noticed the Calculated Load reaching 97.25 percent. That was at about 2300rpm, MAF 32.82g/s.
Then another spot was at Calculated load of 91.76 percent at 3000 RPMs, 97 percent is extremely high, for 11mph (19km/h). Does the vehicle feel very sluggish, can you do a wide-open throttle run, such as getting on a highway and see what the highest RPM you can reach and then let off the gas. Not hold it at that highest RPM but just to see what you can reach and record the live data, rpm, MAF, Intake Air Temp. I can go through the data on your videos and find the highest rpm like I have been so far. But I would expect the vehicle to be very sluggish if these readings are correct. Not being in the vehicle with you, I can only go by the data numbers I see.
But having the Catalytic Converter back pressure tested is one of the first tests to do. Just because over the past year dealing with the Evap system not functioning correctly, it could have overwhelmed the Converter over that amount of time.
This is a Volumetric Efficiency test (VE test) with the numbers you had, and 3000rpm was the highest I saw, and the EST_VE is the results of that test, 51.47%. Thats technically how well the engine is breathing, taking in air and allowing exhaust out. It's possible the scan tool data is not entirely correct, but you did notice a low mpg, and is there a code stored in the engine computer?
At the top there, MIL ON DTC count: 1 (code stored),
Catalyst: Available/Not completed, Evap System: Not Completed.
So, the Readiness Monitors have not been able to pass the self-tests. For some reason the Evap has not either, but the Evap Monitor has to be certain conditions to run its self test. Most have to have a certain amount of gas in the tank, a certain amount of cold soak (off time) has to have gone by, things like that.
So, I'm more concerned with the Catalyst not being complete.
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Sunday, May 28th, 2023 AT 1:04 PM
Tiny
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Car Scanner ELM OBD2
Version: 1.99.0/400990/GP
DTC report
Connection profile: Toyota OBD-II / EOBDDate: 5/29/2023 9:04:48 AM
VIN: 2T3BF4DV2CW234743
============================
OBD-IIOBD-II
DTCs: 2

P0137 [0x0137]
Heated oxygen sensor (HO2S) 2, bank 1 - low voltage
Oxygen Sensor Bank 1 Sensor 2 Low Voltage
Status: Confirmed

P1603 [0x1603]
EEPROM Malfunction
Status: Confirmed
============================
Engine control unit #1Engine control unit #1
DTCs: 2

P0137 [0x0137]
Heated oxygen sensor (HO2S) 2, bank 1 - low voltage
Oxygen Sensor Bank 1 Sensor 2 Low Voltage
Status: Confirmed

P1603 [0x1603]
EEPROM Malfunction
Status: Confirmed
============================
ABS control unit #2
No DTC found.
============================
Steering (EMPS/EHPS/PPS)
No DTC found.
============================
4WD4WD
DTCs: 1

C1280 [0x5280]
Status: Confirmed
============================
Dashboard/Instrument cluster #1
No DTC found.
============================
Climate/Heater
No DTC found.
============================
BCM #1/Convenience systems
No DTC found.
============================
Electric window/Driver door
No DTC found.
============================
Accessory gateway
No DTC found.
============================
Accessory network gateway
No DTC found.
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Monday, May 29th, 2023 AT 3:43 AM
Tiny
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Has the vehicle shut off or stalled out on you recently? These EEPROM codes point to the engine stalling out without turning the key off. Or possibly an error in the engine computer (ECM). Now the C1280 can indicate an issue with the ECM as well, although its reading as a 4wd code, if communications are lost with the ECM this code can set.
As for the P0137 Oxygen sensor Bank 1 Sensor 2, this low voltage I did notice on your live data, but because we didn't know there was a code for it I ignored it at the time. I think you check some of the connectors in the engine compartment and make sure there are no loose connectors, but the Catalytic Converter issue I mentioned already can cause a low voltage on the rear Oxygen sensor because there is a lack of emissions coming through.
If the vehicle did stall out at any time, there are a huge list of things that can cause that, but I think you really need to have a back pressure test done to see if the Catalytic Converter has failed and is restricting the exhaust. If that is bad enough it can cause a stall out as well. EEPROM codes are not good, that is the memory inside the ECM, but I think these problems are related.
In most situations when there are multiple codes like this from different systems, there is a common denominator or main issue causing all the codes, I don't think you have a failing ECM, failing 4wd drive and failing Oxygen sensor all at once.
With the code setting criteria I'm going over, I can see how these can set together if the engine performance is not where it should be due to a failed Converter. Clear all the codes and see what comes back first. But you have to check the Converter.
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Monday, May 29th, 2023 AT 11:40 AM

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