Megasquirt 3x 2rz and 3rz wiring diagram

The following diagram is for a 2000 model 2rz (twin coil type).   Wasted Spark, Sequential Injection.  It assumes use of an LC-1 Wideband.  The power up of the MS unit and control of the fuel pump is particular to the 1985-1988.5 Truck and 4runner:

Megasquirt 3 only – IE Megasquirt 3 with the MS3X board.  DIYAutotune colors, except where marked.   Components such as cam and crank sensor have indicators of factory wire color (1998-2000 2rz)

Click to Enlarge:


Click to enlarge – Tentative Diagram 4/12/2015





Here are MS3X wiring colors:

Megasquirt pin out and function MS3 / MS3X (not all are used – DIYAutotune colors)



MS3 primary connector wiring and colors (not all are used DIYAutotune colors):


MS3X Primary wiring harness colors





0 comments on “Megasquirt 3x 2rz and 3rz wiring diagram
2 Pings/Trackbacks for "Megasquirt 3x 2rz and 3rz wiring diagram"
  1. […] a lot of free support on multiple forums. My plan is to follow the wiring diagram laid out here: There will be some minor differences because my truck is coil on plug and theirs was a two coil. […]