The Holley EFI CAN Input/Output Module can be added to Holley EFI HP, Dominator, Terminator X, and Terminator X Max EFI installations. It adds up to 8 inputs and 8 outputs to the system, useful for controlling additional accessories or reading extra sensors once an existing ECU's inputs and outputs are used up. This version ships without the pre-terminated harness; see part number 554-165 for the complete kit with harness.
Specifications:
- Compatible Systems: HP, Dominator, Terminator X, Terminator X Max
- Adds: Up to 8 additional inputs and 8 additional outputs
- Input Uses: 12V toggle switches, ground input for a brake pedal switch, 5V analog inputs for pressure sensors, thermistor inputs for coolant temperature
- Output Uses: Switch-low (ground) for relay control, switch-low PWM for fan or fuel pump control
- Software Requirement: Dominator and HP require V6 software Build 200 or higher; Terminator X requires V2 software Build 51 or higher
- Harness Included: No — see part number 554-165 for the harness-included kit
- Part Number: 554-166
FAQ
What EFI systems does this module work with?
Holley HP, Dominator, Terminator X, and Terminator X Max EFI installations.
Does this version include a wiring harness?
No, this is the module without a harness. For a kit with a pre-terminated harness, see part number 554-165.
What software version do I need?
Dominator and HP require V6 software Build 200 or higher; Terminator X requires V2 software Build 51 or higher.
What can the extra inputs and outputs be used for?
Inputs can handle toggle switches, brake pedal switches, pressure sensors, or coolant temperature thermistors; outputs can control relays, fans, fuel pumps, or other PWM-controlled devices.
