| MegaSquirt Relay Board Wire Coloring |
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Label |
Wire Color |
Wire Gauge |
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Comments |
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Injector pairing 1+4 and 3+2 for alternating squirts |
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Inj2 |
Light Green |
18 |
Cylinder 1 |
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Inj2 |
Dark Green |
18 |
Cylinder 4 |
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Inj1 |
Light Blue |
18 |
Cylinder 3 |
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Inj1 |
Dark Blue |
18 |
Cylinder 2 |
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FP |
2 Conductor |
16 |
Red to FP, black to ground or ground pump at
pump location |
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Fidle |
Blue |
18 |
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S1 |
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SAW wire for EDIS if used V2.2 board |
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S2 |
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S3 |
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S4 |
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S5 |
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SAW wire for EDIS if used V3 board |
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Vref |
Yellow |
20 |
(Tps pin 2 German) (Mexican Top) |
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Tps |
Orange |
20 |
(Tps pin 3 German) (Mexican Middle) |
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Tps Ret |
Blk |
20 |
(Tps pin 1 German) (Mexican Bottom) |
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Tach |
Grey |
18 |
PIP wire for EDIS if used, otherwise this is
the coil tach wire |
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MAT |
Orange |
20 |
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MAT Ret |
Black |
20 |
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CLT |
Yellow |
20 |
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CLT Ret |
Black |
20 |
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02 |
White |
18 |
Brown from LC-1 |
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Inj 12v |
Red |
18 |
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12v BATT |
Red |
12 |
Direct to battery |
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12v Switch |
Red |
18 |
Use a coil or power that is live for run and
crank |
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Engine GND |
Black |
12 |
Direct to battery, if you are getting noise
logs try a chassis ground |
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| 4 cylinder
EDIS module pinout |
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Signal |
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EDIS Module Terminal |
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Pin |
Color |
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PIP (EDIS output signal) |
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1 |
Grey |
"Tach" on relay board |
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IDM (diagnostic signal to ECU) |
2 |
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Can be used as a tach signal, may get a jumpy
signal with the key on |
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and the motor not
running do to the pulse it sends to the factory ecu |
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SAW (ECU spark control signal) |
3 |
White |
"S1" on relay board for V2.2 or "S5"
for V3 |
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IGN GND (signal return) |
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4 |
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N/C |
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VRS - (crank sensor negative) |
5 |
Red |
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VRS +(crank sensor positive) |
6 |
Green |
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VRS shield (crank sensor shield) |
7 |
Black |
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VPWR (ignition switched 12 volts) |
8 |
Red |
This power also goes to the coil pack |
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PWR GND |
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9 |
Black |
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COIL 1 (coil drive) |
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10 |
Light Green |
Twisted pair to coil pack |
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CTO (clean tach out) |
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11 |
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To dash tach, some modules do not have the output |
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COIL 2 (coil drive) |
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12 |
Dark Green |
Twisted pair to coil pack |
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