Charade a/c wiring to ecu

[jdolondriz]

Thank you so much for all the help. Will a 1n4007 diode suffice?

[Hassan1991]

Yes but should be higher amps.
Anytime.

[jdolondriz]

How many amps should i get?

[jdolondriz]

Could I use like 50v 4700uF?

[Hassan1991]

Yes you can.

[jdolondriz]

How abt amps of the diode? 20 amps?

[Hassan1991]

No, it's going to be used as a flyback diode. A 2-amp 1n4007 will work.

[jdolondriz]

Would a 6amp 1000w diode be ok? I have this at home already

[Hassan1991]

Will function.

[jdolondriz]

Good day. Where should i place the other diode? Is it through from the relay to the compressor? Or from the thermo switch to the ac relay?

[jdolondriz]

@Hassan1991 Thank you so much for the help. It is fixed already. Added capacitor to the acc wire of radio. Should it be connected to b+ instead?. 1n4007 from ac switch to thermo switch. 6a10 diode from thermo switch to ac relay. Thank so much. Really appreciate it.

[Hassan1991]

Glad to know. Anytime.
Yes, connect to B+.
Also flyback diode should be installed between the coils pins of relay.

[jdolondriz]

@Hassan1991 thank you so much for all the help! Would you know if ecu aignal to radiator fna send negative or positive? Thank you.

[Hassan1991]

ECU provides ground to high-current devices.

[jdolondriz]

Thank you ao much. It is indeed ground after checking diagram. Thank you for the confirmation.

[jdolondriz]

Good day, just want to ask if wiring thermistor should be E2 on one wire and the other wire goes to ecM/ecu? Am i correct in my understanding that thermistors have no resistance at temp higher than 1c? Then it adds resistance at temps lower than 1c? Tha ks for the reply.

[Hassan1991]

It's an NTC. Negative temperature-coefficient thermister. As temperature rises, resistance decreases. You can find the temperature to resistance graph in the service manual.
One wire will be ground and the other to the ecu.

[jdolondriz]

It says here to wire e2 to thr. Can i just wire it to ground? Does e2 on ecu also send ground?

Thank you

[Hassan1991]

Connect it to e2. It's the reference ground for sensors. See which other sensor has e2 close to the thermistor you can connect it with that sensor ground.

[jdolondriz]

I think im giving up on this ac system. Ill just let it have high idle when ac is off. I have hooked up e2 and thr to ntc thermistor. Prs on constant ground and kept ac wire from ec disconnected to act as turned off but nothing is happening. Rpm is still at 1.3.

Last hope is to open ecu to check labels of pins. But i still have to buy the right screwdriver to ope. It.

Thanks for all the help