Re: Holley EFI - Useful Links, Tips, Tricks
Electric Fan Wiring - Holley ECM Controlled - From
http://forums.holley.com/showthread.php?6569-Wiring-an-Electric-Cooling-Fan-Holley-EFI
in short.
Understanding how a relay works
http://www.autoshop101.com/forms/hweb2.pdf
1st, Enable the Electric Fan(s) in "Basic I/O" - "System Parameters".
2nd, Enter "Inputs/Outputs" (also in System Parameters), and select the "Output Type" for Electric Fan(s).
I prefer it to be a ground output, however, it can be programmed to be either one (+12V or ground).
3rd, It must be Pin-Mapped to an available J1 connector output pin; click "View Outputs" on the Pin Map.
Then click & drag it to an available J1 Connector pin. Now you can run this wire to your electric fan relay.
A relay must be used because all the ECU's Outputs are rated at a maximum of 2 amps.
You're actually programming the ECU to assign a specific function to that pin/circuit.
It doesn't have a specific assigned pin;
it's any available Output pin, according to which Output Type you selected
in Inputs/Outputs (System ICF).
Don't worry, the EFI software won't allow you to make a mistake with the Pin Map.
Pin Mapping http://documents.holley.com/techlibrary_199r10545rev.pdf
To connect up to 4 Inputs & Outputs to the EFI main harness, use I/O Auxiliary Harness 558-400.
Eight Wire I/O Auxiliary Harness Connector Pin-Out (also in the Holley EFI Wiring Manual Link):
Pin A...A12...White/Blue (Input #1)
Pin B...A3...White/Red (Input #2)
Pin C...A13...White/Black (Input #3)
Pin D...A4...White/Green (Input #4)
Pin E...B12...Gray/Yellow (Output #1)
Pin F...B11...Gray/Red (Output #2)
Pin G...B10...Gray/Black (Output #3)
Pin H...B3...Gray/Green (Output #4)
Fan Relay Schematic
http://documents.holley.com/199r10158rev.pdf
Fan RelayKit
https://www.holley.com/products/fue...rts/commander_950_service_parts/parts/534-134
