MGV101

I am looking into setting up PWM control for a number of fans and water pump for my car and is trying to figure out the wiring side of things. I know the general approach would be to drive a solid state relay using a PWM output on the G4+ and use the PWM duty cycle to control the effective voltage so I though simply wring a PWM output from the relay would do the job.
However, the more research I do the more I am confused. Searching online I have found diagrams from haltech and adaptronic where both had a similar setup. Both diagram had a 1K pull up resistor connected in parallel to the input side and haltech warned that damage would occur if the resistor is not installed. The adaptronic diagram also what looked like a freewheeling diode but it is connected in parallel to the output side (you shouldn't need one even if it is on the output side since there are no coils to drive in a SSR anyway).
I cannot figure out what is the purpose of that 1K resistor nor the diode on the outside. What exactly are their purpose?
Also, both diagram had prescribed specific outputs to use for this purpose and warned that damage may occur if any other outputs are used. Will that be the case for G4+?
Thank you!
 
http://www.adaptronic.com.au/forum/index.php?topic=6106.0

Look for pinouts on the 1zz coil.
I connected the +12 to the original coil power supply coming out from the fuse box, -ve to a grounding point on the engine block itself, and IGT (trigger) to the appropriate ignition outputs from the ECU according to cylinder number. It's nothing complicated, the ECU settings will handle the rest. The IGF pin on the coil is not used.
 

I'm in the process of tidying up all my wiring while the engine is out of the car.
Got sick and tired of the entangled mess of wires and splices into the stock ECU harness that I have actually printed a PCB with proper header and connectors acting as a central hub for all my external input/outputs that routes everything to my MR2Link V2-3 plug-in ECU with the XS loom through the expansion connectors.
Originally the boost solenoid and tach output were connected to the Aux output through splices in the stock ECU harness and I planned to clean things up by relocating them to my custom hub. While looking through the help files today I have noted that certain Auxiliary Output channels can only be used with certain Functions and according to the table in the help file, Aux Ign 5 to 8, being the only output available on the expansion connectors on the MR2Link, do not support boost solenoid or tacho functions.
However when I open up menu for Aux Ign 5 to 8 in the PCLink software, it does allow me to assign boost solenoid or tacho functions to those outputs. I noted the output functionality documented in the help file was based on the older 5.4.3 firmware and was wondering whether newer firmware had enabled this or the output function in PCLink is actually false and the output would actually not function properly when boost or tacho is selected.
As the engine is out, I am unable to test the outputs and is hoping that I can find an answer here so that I can do all the re-wiring work correctly.
Thank you!

I've done it!
The basic information for EGT communication were publicly available on their website all along! Seems like we have just overlooked it!
The user manual for their CAN EGT module actually carried information for their CAN setup within the wiring diagram on the very last page!
 http://microtechefi.com/wp-content/uploads/2015/05/EGTModule.pdf
However can ID was actually given in HEX format so their CAN ID of 018 and 019 actually represented 24 and 25 in PCLink. As for the parameter format, it was straight forward enough to guess following the same logic as the Microtech Protocol. EGT 1 to 4 was carried by CAN ID 24 anf EGT 6 to 8 was carried by CAN ID 25 in a single frame. All eight bytes of data are used for carrying parameter values and all parameters are sent in sequence as 16bit unsigned numbers MS first and needs an offset value of -50 from PCLink.
For this to work, the display must be in MicroTech mode though.