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New install, question on the relay board

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So I have the brackets and bits bolted onto engine all supplied in the kit from Nige 

Then bought the relay board from diyautotune now going to start running the wires.

After looking at the board was wondering if anyone has a diagram for which wires go where ?

Most I can figure out but cannot see Pwm or where the white ignition wires go?

Any help would be greatly appreciated 


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MS Relay Board Wiring


The Relay Board has 4 sockets for fuses

Main Fuse : 20A,  INJ1 Fuse and INJ2 Fuse : 7.5A  FP Fuse : 10A


It also has one “20 Way” screw Terminal Strip, and 3 x solder leads, which are used to connect to your vehicle to the MS ECU, and a D37 Solder Plug connector. No other connections are required


The “20 Way” Pinouts for Spark n EDIS are as Follows :


BOTH INJ2 Pins connect together as do INJ1

MS Switches the Ground connection on and off

The + Connection to the injectors comes from the

4 way Screw Terminal board on the relay board


INJ2 -  Injector Bank 2 GROUND      


INJ2      - Injector Bank 2 GROUND     

INJ1 - Injector Bank 1 GROUND     

INJ1 - Injector Bank 1 GROUND     

FP – To Fuel Pump

FIDLE – To Fast Idle Solenoid – PWM Valve





S5 – To SAW Connection on EDIS – See EDIS Diagram on CD

Vref - +5v to throttle position sensor

TPS -  Throttle position “Wiper”

TPS Ret – Throttle Position Sensor – GROUND

Tach – To PIP connection on EDIS – See EDIS diagram on CD

MAT – Manifold Air Temperature Signal

MAT Ret – Manifold Air Temperature Ground

CLT – Coolant  Temperature Signal

CLT Ret – Coolant Temperature Ground

O2 – Lambda Exhaust Sensor Signal – see 4 wire info on CD Lambda page


There are Indentifiers on the Board as to what goes where, but if you look at the picture of the relay board here, there has been a alternative way of connecting which is explained below, and why done.


Whilst this is not the “Proper way” as outlined above, it has its merits, read both and decide.


On the relay board there are 4 connectors the injectors with +ve and 2 connectors each for bank 1 and bank 2 negative.

In the picture the slight change has been to use 2 of the injector +VE to supply the EDIS +VE and then connecting 2 injector +VE wires to each of the 2 injector +VE connectors on the relay board.

Basically 4 wires into 2 sockets leaving the other two spare for a nice healthy supply for the EDIS +VE.  The far end of the relay board connector strip has the 4 injector -VE connectors, 2 for each bank.

So this means you’ll  have 8 wires running from relay board to engine, 4 +VE, 2 -VE bank 1, 2 -VE bank 2. When the wires get to the engine, they are spilt accordingly so there are 2 +VE and 2 -VE each side.

Run these down the side of the fuel rail and snip them to length to fit the middle two injectors. You will then have 2 +VE and 2 -VE each side so that's enough to feed 2 injectors.

All you have to do then once you're sure and you cut them to length for the middle injectors is to piggyback from those middle injectors to the front injector from the front-middle and to the rear from the rear-middle, nice and simple just wire them in parallel.  



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Posted (edited)

Thanks for the reply Nige, was there suppose to be a piccy involved with it ?

So the three solder terminals are ground, 12 volt from battery, a 12 volt switched from ignition ?

Edited by johno753

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Nige - do you need to bridge out the FIDLE relay?

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After going through all that I have one more question about the pwm valve, does the orange to 12v switched live hook into the white 12v switched live from the ignition ?

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