Hondata

the compressor clutch is not engaging. I put in the old ecu back in and the problem goes away.

Hondata re-installed, i looked at the hondata parameters and nothing is set to use the AC switch that im aware of. I checked several tabs. AC control is set to turn off at 7krpm and 100% throttle

in the sensors section, when i turn AC on it says the fan and compressor is on, but when i look only the fan is on.

Post the calibration and a datalog showing the issue.

What is the part number of the ECU you are using?

i looked for the ecu part number but it has been removed. I bought it on eBay. The description on eBay said it was OBD1 P28 VTEC ECU computer S300 V3 cost $879.95 on Oct 2021.

The original ECU was 37820-P28-A01

Try putting the AC controls back to 5000RPM and 36% throttle.

ok i put the AC controls back on 5000 rpm & 36%, then i recorded this datalog. I started recording with key in accessory and then started the engine with the ac off. Then i turned on the AC and waited. Then revved it up. then waited. then turned AC off. then stopped the recording. then turned engine off.

According to the datalog it is working. If the AC is sill not engaging then the ECU is probably missing the components for AC or is damaged.

Do i need to sell the ecu or can i get ac on it? How do I check to see if it has the components? Can you or i repair it?

I'm sorry, but it's not something that we repair or add components for. I would recommend switching to a different ECU that is socketed for the s300.

How can i be sure that this ecu doesn't have the components?
And if i directly wire the compressor to the positive battery terminal it will work but does that actually solve my problem?
I have another ecu with a/c which when i hook up solves my problem, how can i socket it for hondata if it comes to that?

Since it works with the original ECU, it is either a damaged ECU or the ECU does not have the circuitry for it to operate. Wiring it directly just tells you that the AC system works but is not a solution to the problem. Leaving it constantly on by wiring it directly will eventually burn it out as it must cycle as needed. You will need to obtain a different ECU to put the s300 into.

Heres another data log of when i was driving. I tried to use ac for a little bit as well. I plan to send this data log to my tuner and see if he can tell me why my ac wont work, why i am gettng such bad gas mileage, and why it seems to barely start although it starts every time.

My tuner suggested I change the fuel filter because motor needs fuel for the added power. He's gonna lean the vacuum tables out and look over the tune. He also may send another p28 that's s300 ready to see if it fixes the A/C.

He can't send his ecu because his has BBG and mine doesn't. How can i get around that?

It will not be a problem just to try the AC.

Ok i sold that ecu where the ac wasn't working and got the new one installed. Haven't tested the AC yet but was wondering about my fuel economy.

I have a AEM 30-0300 X-Series Wideband UEGO.
I hooked it up to d14 and grounded it to a26.

Found an article describing the d10 vs d14 issue on HAMotorsports' website.
"UPDATE: With all newer wideband systems that use the Bosch LSU 4.9 sensor, 0-3.73 volts reading through the stock D14 02 sensor input is more than sufficient for reading air/fuel ratio, so using the D10 ELD input is no longer beneficial. If your wideband uses the Bosch LSU 4.9 sensor, we recommend using the D14 input now, this way you can leave the ELD circuit functional."

I'm not turbo or anything yet just bolt ons and my tune is using too much fuel so I replaced it with the stock calibration file.

What should i do in the s300 under closed loop parameters and closed loop advanced parameters? For best fuel economy can i select narrowband even though it's a wideband?

Or should i just install the stock narrowband o2 sensor for now until i go turbo and get tuned?

When turbo will i need a narrowband AND a wideband sensor installed for best fuel economy?

Also, suppose i get a tune done with the wideband, then can / should i then replace the wideband sensor with the stock narrowband o2 sensor for better fuel economy and what changes to s300 would i have to make?