How to Megasquirt your 3G Hemi
Inputs First:
Crank trigger input (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 24 on the main megasquirt plug. FYI it is encased! See pic below. It is NOT clearly labeled.
Pic of encased crank sensor feed wire:
And another:
Cam sensor input (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 32 on the MS3X plug. Wire is labeled.
Throttle position sensor (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 22 on the main Megasquirt plug. Wire is labeled.
Coolant temp input (common ground to box and signal out)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal Out: Pin 21 on the main megasquirt plug. Wire is labeled.
Intake air temp input (common ground to box and signal out)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal Out: Pin 20 on the main megasquirt plug. Wire is labeled.
Wideband O2 sensor (O2 sensor to it's own box, then common ground to box and signal out)
Ground I grounded to Chassis
Signal to box Pin 23 on the main megasquirt plug. Wire is labeled.
Inputs First:
Crank trigger input (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 24 on the main megasquirt plug. FYI it is encased! See pic below. It is NOT clearly labeled.
Pic of encased crank sensor feed wire:
And another:
Cam sensor input (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 32 on the MS3X plug. Wire is labeled.
Throttle position sensor (5v power, common ground to box, and signal out)
5v power: comes from Pin 26 of the main megasquirt plug this 5V output is shared with crank, cam, & TPS)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal out: Pin 22 on the main Megasquirt plug. Wire is labeled.
Coolant temp input (common ground to box and signal out)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal Out: Pin 21 on the main megasquirt plug. Wire is labeled.
Intake air temp input (common ground to box and signal out)
Common ground to box any of the black wires going back to the box (pins 7-19 of the main megasquirt plug)
Signal Out: Pin 20 on the main megasquirt plug. Wire is labeled.
Wideband O2 sensor (O2 sensor to it's own box, then common ground to box and signal out)
Ground I grounded to Chassis
Signal to box Pin 23 on the main megasquirt plug. Wire is labeled.
