my F20B motor have changed to use OBD1 P28 ECU recently, it using the OBD2B to OBD1 conversion hardness with P28 ECU. However, I found the ac condenser fan is not turn on when I switch on the ac.

Suspect is the ECU or the conversion hardness problem...

Any one can advise on that?

 

bump!!

provide more information......the ac clutch is engaged when i switch on the ac....but the condenser fan is not working...

Any one can help!?

 

bump!!

I have tried to fallback to use orignal ECU(OBD2), the ac condenser fan is working fine without any issue....once switch on the ac, the ac condenser fan will turn on together...

Any one any help?

 

I am having this problem. Old thread but looking for any answers. Can anyone help?

 

MM&Y of car would help, along with any mods.

Have you checked anything yet, is the condensor fan any good, will it run if powered directly, have you checked fuses, condensor fan relay, anything? 94

 

I have a 2000 accord ex coupe. New F20b swap that's giving me a huge headache. Chipped p28. All physical components are in good working order.
I've recently discovered that the temp gauge doesn't respond to the type of signal the p28 sends to it. Does the breakdown in the ECT system using the p28 affect the condenser fan as well? How can this be fixed?

 

If you're looking at it using your laptop the temperature you are seeing from the ecu is coming from the engine coolant temperature sensor. The temp gauge on the cluster is getting its reading from the temperature sender that is located next to the coolant temperature sensor below the distributor. The one prong is the sender and the two prong is the sensor.

 

This is not correct for my motor. There is no sending unit. It has been integrated into the coolant temp sensor. My accord only has 2 plugs: coolant temp & fan control.
Any other advise?

 

I was responding to the OP without realizing the date.