Thread: Prepping for MAP conversion

If you do use the ECU to control the fan MAKE SURE YOU USE A RELAY!

The ECU outputs are not made to drive something like the fan directly and must use a relay in line.

O2 sensor is an input, so you haven't actually used an output.

Cheers,
Dave

Man this looks so confusing man i'm getting a bit nervous now

oh, i thought using the o2 heater to activate vvl counted has output? my bad.



totally! i was thinkin last night how i'd go about that.. maybe i could just hook one of the outputs to that white wire w/ green stripe that goes to the relay.. now that i know what it does.. i plan on going ape shit with the multimeter today lol



well im doing my best to document this so that other guys have an easier time haha.

O2 sensor is an input, O2 heater is an output.

Cheers,
Dave

If you have any specific questions you can always ask on here or just shoot me an email.

I would suggest keeping it simple and just running your own wiring instead of hacking into the stock harness, especially if you are unsure of some of the wiring.

I specified a 5k ohm to limit the current draw when thermistor resistance is low. Wiring two 5k ohm resistors in parallel is the equivalent of 2.5k ohms, doubling the current draw. While I have not tested the upper current limit of the 5V supply in the breakout box, I suggest using at least 5k ohms and calibrate by shifting the IAT conversion table. There should be plenty of resolution in a reasonably expected IAT range.

If I had the ability, I'd attach an excel sheet that shows the voltage based on divider resistor. (Vadim?)

Cheers,
Dave

OK so IGNORE the white wire with green stripe!!!

that little suckers all over the place.. it not only goes to the AIV and EGR canister plugs but it leads to the white dash plug, from there it goes to (i think) the fan relay under the hood and then the fuse box in cabin to the engine control fuse, or something along them lines.. So using it for a ground was highly foolish, i should have checked into it more.. BUT NOW YALL KNOW..

i replaced the burnt fuse and now my rad fan works again, so no need to macgyver that shit... This time...

im going to keep it simple and run external grounds, i already utilized the pink and grey wires from the AIV and EGR canister stuff which is all good..

alright i finally got the map an iat wired up! yay! ended up just running a ground from the map an iat to where my ecu an maf are grounded.. made life simple! lol

you can see here, at first i tried utilizing the pin 21 ecu ground, wasn't working tho.. so went the other route.. however everything else remained but i dropped the grounds..



i know my wire selection is limited but thats ok, i know whats what

in this pic you can see how i wired up the resistor, what i did was ran a wire from the 5v out to one side of the resistor, then i peeled part of the insulation back on the grey wire im using as signal from the iat sensor and attached the resistor there, then the end of the grey wire goes to adc



this is all i could find at my local radioshack



hopefully that resistor will work ok..

i tried to solder everything an use heat shrink.. having an inverter in the car kicked ass for using the soldering gun hehe

@lynchfourtwenty, how did this setup work for you? Everything working okay?