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Sorry i have 1997 toyota camry with ECC climate control. its like this. I heard that es300 is similar? Because this is rare in camrys even my 1200 page shop manual wont cover it. My first problem is that diagnose mode does not allways work. Its AUTO+RECIRC and then ignition on? Screen icons blink four times and then usually nothing happens. When happens, it does blower test and different blowing positions on and on it wont stop. It wont show any codes. Reason why i am doing diagnose is that my car wont give that hot air what it should.
At HOT position it gives about 70-80% what i should have. Itsn not cold but not hot enought. Thermostat is okay, hoses are hot and heater core wont leak. Some door is jamming etc?
I tend to think your problem is mechanical like a blend door not moving properly. That control unit seems to be hard to find I didn't see a single one on Ebay.
I tend to think your problem is mechanical like a blend door not moving properly. That control unit seems to be hard to find I didn't see a single one on Ebay.
Cant get that file open
I think too blend door etc but that diagnose mode fail is weird. All positions works.
Diagnostics system in that car has three different modes - first flashes all the lights and display segments for you to see if they all function as expected, it turns on each time you enter Diagnostics mode; the second mode outputs error codes stored in the system, it is shown right after the system is done flashing all the lights; third mode is an actuator check, which switches between different scenarios to check all the servos and a blower motor, that mode is activated by pressing Recirculation button while in Diagnostics. Here you can find a chart with all the codes available in the system; 00 indicates that everything is normal and no codes are stored, 21 may indicate that it is too dark outside, try using a flashlight on the sensor to see if the code will leave.
As for the heat issue, you are completely sure the car warms up to the operating temperature and stays there. What about coolant level, is it good? Other thing to consider is air trapped in the system, did you perform any maintenance on the cooling system recently? Check the cabin air filter, see if it is gunked up. When the engine is warm, set the temperature to Max Hot, locate two heater core hoses under the hood on the driver's side (here is a parts diagram) and carefully touch them - the inlet should be as hot as the radiator hose, the outlet should be a little cooler. If the outlet is cold, it will indicate that the heater core is clogged. If that's good, check the blend door and its actuator. How exactly it controls amount of hot air I am not sure, it is different between Camry and ES300.
P.S. As for the file host, have you tried Google Drive? It has 15GB of storage at your disposal for free, you can share files just by adding a link to your post, and as an added bonus, it lets you see the file without having to download it. I think by now everyone should have access to the Drive, maybe you should give it a try..?
Hope this helps and best of luck!
Last edited by Arsenii; Jan 3, 2021 at 03:43 PM.
Reason: Added information/Corrections
Diagnostics system in that car has three different modes - first flashes all the lights and display segments for you to see if they all function as expected, it turns on each time you enter Diagnostics mode; the second mode outputs error codes stored in the system, it is shown right after the system is done flashing all the lights; third mode is an actuator check, which switches between different scenarios to check all the servos and a blower motor, that mode is activated by pressing Recirculation button while in Diagnostics. Here you can find a chart with all the codes available in the system; 00 indicates that everything is normal and no codes are stored, 21 may indicate that it is too dark outside, try using a flashlight on the sensor to see if the code will leave.
As for the heat issue, you are completely sure the car warms up to the operating temperature and stays there. What about coolant level, is it good? Other thing to consider is air trapped in the system, did you perform any maintenance on the cooling system recently? Check the cabin air filter, see if it is gunked up. When the engine is warm, set the temperature to Max Hot, locate two heater core hoses under the hood on the driver's side (here is a parts diagram) and carefully touch them - the inlet should be as hot as the radiator hose, the outlet should be a little cooler. If the outlet is cold, it will indicate that the heater core is clogged. If that's good, check the blend door and its actuator. How exactly it controls amount of hot air I am not sure, it is different between Camry and ES300.
P.S. As for the file host, have you tried Google Drive? It has 15GB of storage at your disposal for free, you can share files just by adding a link to your post, and as an added bonus, it lets you see the file without having to download it. I think by now everyone should have access to the Drive, maybe you should give it a try..?
Hope this helps and best of luck!
Thank you!
So diagnose mode works like it should. It gived code 21 that solar sensor you mentioned. If there is more codes will it show these automaticly? I press all buttons but got only 21.
Solar sensor is only for ac? It cant effect max hot or max cold position?
There is air mix servo and air outlet servo, are both working with hot air? Or is air outlet servo only for recirc/outside air?
And that valve at heater hose normally closes heater hose only at ac and cold positions?
That servo what moves when i turn cold-hot sounds normal, not bogging or sagging.
If there is more than one code stored in the system, they will pop up in sequence, one after another. In your case, 21 is the only code stored; as I wrote before, to erase it, unplug ECU-B fuse (or the battery), and while at that, put a flashlight in the sensor, assemble everything back together and see if the code will leave. That sensor is mostly reference, and mostly for the Air Conditioning system, so that will not result in the issue you described.
There is a Air Mix Servo that controls the temperature in the cabin, and an Air Inlet Servo that opens or closes access to the outside air. Air Mix Servo is located on the driver's side, below the Air Outlet (Mode) Servo, and the Air Inlet Servo is on the passenger side, to the right of the Blower Motor. The water valve on the inlet hose is what blocks the fluid when you need cool air in the cabin, it is driven by the same servo that drives Air Mix door. You can try disconnecting the cable and seeing if you can open that valve more; if so, it may indicate that the cable is bad (very unlikely), or the servo is not reaching its limits.
As far as I know, that is how it works in ES300, I am not a 100% sure that it is the same exact setup in Camry..
If there is more than one code stored in the system, they will pop up in sequence, one after another. In your case, 21 is the only code stored; as I wrote before, to erase it, unplug ECU-B fuse (or the battery), and while at that, put a flashlight in the sensor, assemble everything back together and see if the code will leave. That sensor is mostly reference, and mostly for the Air Conditioning system, so that will not result in the issue you described.
There is a Air Mix Servo that controls the temperature in the cabin, and an Air Inlet Servo that opens or closes access to the outside air. Air Mix Servo is located on the driver's side, below the Air Outlet (Mode) Servo, and the Air Inlet Servo is on the passenger side, to the right of the Blower Motor. The water valve on the inlet hose is what blocks the fluid when you need cool air in the cabin, it is driven by the same servo that drives Air Mix door. You can try disconnecting the cable and seeing if you can open that valve more; if so, it may indicate that the cable is bad (very unlikely), or the servo is not reaching its limits.
As far as I know, that is how it works in ES300, I am not a 100% sure that it is the same exact setup in Camry..
Hope this helps and best of luck!
Thanks! I checked water valve, cable and valve moves good and closed when i want hot air inside.
I checked and soldered ecc panel which was allready at good condition.
There has been -4f and around weather and car gives hot air but if i adjust too much air then it starts to blow semi hot. So it must been servo or flap. I adjust cold hot cold hot and it works several times untill hot doesnt give that hot that it should. So servo wont adjust it or there is trash or some other.
I got soon inspection worm camera so i try look with that example cabin air filter place when i remove it first. If i see flap?
Es300 ECC / camry ECC
