Ask Xulfiqar - An Automotive Encyclopedia

[afnan.bashir]

That is the thing. CEL is not on.

[afnan.bashir]

MAP tests good.
IGN ON = 2.9 V
Start = 1.0 V

Sudden Throttle = 2.9 V

Resting after RPM Rise = 0.9V

[tintin1]

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[afnan.bashir]

I am just posting my diagnostic so that it may help someone someday.
UPDATE: So if its in Limp mode it considers default calculations to run engine. Which works fine.

This rules out Fuel Pressure.
I have checked MAP Sensor its fine
O2 sensor .... i dont think it will cause that issue.

Next stop Opened ECU You will see this black square IC with hole.

.

On tracing the sensor.
Pin
1,5,7 are GND
3,4,6 are logic + = 5V.
2 is Voltage out.
8 seems NC.

Normal voltage is 1.5v.

Upon inducing P2228 or P2229 that is grounding output or giving VCC, the car throws CEL which it is supposed to do, Car is now not reading this BARO but reading TPS and MAP. Now the car is not in Limp mode hence TPS,MAP, Fuel Pressure and O2 are fine.

That is good news rite? well yeh and a big NO. Solution to this problem is replacing the ecu, which means either i swap EEPROM to new board or get dealer program the key. Again PITA.

I am thinking, although not a wise option to put a variable to replicate 1.5 and then play with its adjustment until car works fine. but that may result in P2227. Only time will tell. Cant find replacement part no otherwise i would just swap the part.

[afnan.bashir]

UPDATE:

Removed the Baro and installed 10k variable resistor. On adjustment car is fine. Downside to this is compensation to air density based on altitude would be missing. I will find a solution to that sometine later. Maybe sensor swap with other ecu or using sensor like MPX2450 .....

[arsalaanali89]

Have u solved the heatup issue? Besides, using an out of spec thermo switch ain't advisable. If a car is designed to run optimally at 50%, let it b so

[aminurrehman]

@Xulfiqar

I bought a used 2014 Grande on 96k mileage. The A/C was sometimes cooling fine but sometimes would totally stop cooling. I took it to an A/C mechanic and he filled the gas and installed a new blower filter in the dashboard.

The problem still remains. He told me that the compressor is weak. Now the new compressor is super expensive ~Rs. 56k from Toyota.

What's the best way I can fix this problem? Any specific A/C mechanic I should take this car to?

Also, I have an import business. Can you please share a link from ebay.co.uk of the Grande Compressor that I can buy? (I'm assuming, it might be cheaper there).

[imrananr]

Bro, if you are installing new A/C compressor, the following also have to be replaced:

1) Accomulator or receiver drier
2) Orifice tube or expansion valve ( which ever installed in ur system)

If you do not replace these items, after complete flushing of your system, simply replacing compressor will do you no good.

[OgRe1985]

@Xulfiqar @capsat I am having AC problem in Toyota Corolla Xli 2010. AC works fine when the car is moving above 1 rpm but at idling AC stops working. I checked with the AC guy and he told me it's a compressor problem and change it with duet or Toyota 2005-6 model compressor. Should I go for it? Is it really a compressor fault?

[tintin1]

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[xenerking]

i didn't know that compressor needed current to pump refrigerant!! i though current was only needed to activate AC clutch!!

corolla is not hybrid/EV as well!

[afnan.bashir]

Relay is not the solution to these problems. It may be HACK way of doing things. Compressor should work all time at idle RPM provided your car is ideling at correct RPM.

When these mechanics install compresser they just dont put correct specified oil and they dont put it at all. This causes metal shavings and then choke your condenser and sometime making way to evap as well.

Good mechanic is a myth. I spent like thousands to get my cars done from mechanics until I pay 1000 rupee labour and direct them to do work as per books which I told them.

reciepie to success is
1. Correct volume of oil
2. Specified grade oil
3, Fill gas by weight (there is a reason companies mention gass required in grams under the hood sticker)
4. Fill it with max blower windows open

[OgRe1985]

Yes I am from Lahore

[OgRe1985]

So what is the solution? What should I do?

[xenerking]

as the car is fairly new and if you intend to keep it and want to get optimal results then please be prepared to spend good chunk of money:

1. open the system and try to observe/inspect very carefully the internal position of condenser, if there is black slug then simple change it.
2. properly wash all tubes with CTC
3. also check evaporator for same, there are chances that debri from compressor havent reached there yet.
   4.check the TX valve, of blocked, then get a new original one.
4. get e new compressor of find a kabuli unit with very good condition/ carefully add original denso oil in mentioned quantity on compressor
   6.Install everything using new O-rings, and then pressure test with nitrogen.
   7.fill in refrigerant according to weight.

InshAllah it will serve to max.

[tintin1]

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[saboor73]

Firstly I will suggest to try to increase the idling RPMs with ac on.
Increase just little bit (try only 100 rpms first and later 100-150 more) otherwise it will increase fuel consumption.
if issue solve, then are you lucky.

How exactly will he be able to increase idle rpm on such a modern engine ?

[afnan.bashir]

By messing with Tratle bady screw and curse car after that

[hassantahir2]

mentioned quantity on compressor

Are you sure about that?
Isn't oil quantity according to the size of system..
I was checking about that online different car's having the same compressor but different A/C components had different amount of compressor oil....
I doubt if the oil quantity is dependent on compressor..

[saboor73]

By messing with Tratle bady screw and curse car after that

Even that isnt possible as grande 2zrfe engine is equipped with drive by wire throttle body