Holley EFI - Optional I;O Connector Details; I;O Connector Pinout and Functions

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Figure 4. Flip door down
Figure 5. Slide door to the right to lock
Optional I/O Connector
The internal I/O connector can be used for stand-alone applications or as additional inputs and outputs. An
optional I/O adapter is available as part number 558-432, 558-433 or 558-434.
IO1
IO2
IO3
IO4
IO5
IO6
IO7
IO8
IO9
IO10
SSR GND switched output (2A)
Y
Y
5V Input
Y
Y
Y
Y
Y
Switch to GND input
Y
Y
Y
Y
Y
Y
Y
Switch to +12V input
Y
Y
Y
Y
Y
Y
Y
RPM Input
Y
Y
Speed Input
Y
Y
Oil Pressure (5V)
Y
Resistive Sensor to GND
Y
Y
Y
CTS / MAT Sensor to GND
Y
Y
Y
Fuel sender input
Y
I/O Connector Supported Functions
Pin
Function
Sample use
1
5V EXC
5V excitation output for sensors
2
IO1
Left turn input or General I/O
3
IO2
Right turn input or General I/O
4
IO3
Digital Engine RPM input or General I/O
5
IO4
Digital Speed Input or General I/O
6
IO5
High beam input
7
IO6
Brake input
8
IO7
Oil pressure input
9
IO8
Oil temperature sender input, built-in pullup
10
IO9
Coolant temperature sender input, built-in pullup
11
IO10
Fuel sender input, built-in pullup
12
GND
Ground reference
I/O Connector Pinout