Radiator Fans only working with A/C on - ZR-1 Net Registry Forums

MrsMcNastys · 07-17-2014

OK so we have done the ECM coolant sensor swap with no change in problem.

Went back and verified fans, relays wiring again everything as it should be.

Fans only activate with A/C operating or pressure switch connector unplugged.

Was able to figure out engine data from A/C system control screen to verify ECM knows engine temp to activate and it does know correct engine temps.

Soooo ... we are back to square 1. Having a second ZR-1 available is a great resource as we will be swapping chips and ECU to determine if that is the problem.

Special thanks to Marc Haibeck who took the time to help on the phone, this one is a head scratcher for him also.

Ed

07-17-2014	#11
MrsMcNastys Join Date: Jul 2012 Location: Somerset KY Posts: 16	Re: Radiator Fans only working with A/C on OK so we have done the ECM coolant sensor swap with no change in problem. Went back and verified fans, relays wiring again everything as it should be. Fans only activate with A/C operating or pressure switch connector unplugged. Was able to figure out engine data from A/C system control screen to verify ECM knows engine temp to activate and it does know correct engine temps. Soooo ... we are back to square 1. Having a second ZR-1 available is a great resource as we will be swapping chips and ECU to determine if that is the problem. Special thanks to Marc Haibeck who took the time to help on the phone, this one is a head scratcher for him also. Ed