i have wired the ecm for the dsp5 switch. so that part is done. i also have built the switch just like the dsp tutorial. i also have made my best tune into the dsp5 os. now the stupid part, the main tune says it has to be 4v or more, then lower for each tune down the line. the question is according to there tut. the main or (factory map) like it says, has a 25k resistor the highest resistance in the chart, and the highest corresponding voltage. sounds backwards to me. and the 5 position is the least voltage and least resistance. please help before i fry something like my brain
guys ? on dsp5
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Not a clue. Aren't you running a SoCalDiesel Switch?
If you are trying to figure out which position does what, zero out the fuel table in one tune. It won't start in that position.
If you are trying to figure out which position does what, zero out the fuel table in one tune. It won't start in that position.
Thats correct. Its like powerlines. The more ground u have the least resistance u have. Which allows the ecm to have so many tunes. Lol i no i didnt explain this right. I could explain it better in person lol
The voltage parameters are totally adjustable. Look at table A0142-A0145.
The factory map has the highest resistance on the circuit with a 25K resistor. The factory map circuit is designed to activate at above 4 volts. So anything between 4 and 5 volts will trigger the factory map or main calibration. The next circuit activates above 3 and less than 4, and so on down the tables.
With the switch not even installed (infinite resistance) the circuit will see 5 volts and default to the factory map.
Remember the other side of the switch is wired to ground in the ECM. As we decrease the resistance in the circuit we are in effect improving the ground and the voltage begins to drop as more of the current is allowed to flow through to ground.
Hope this helps.
Clear as mud?
Guy
The factory map has the highest resistance on the circuit with a 25K resistor. The factory map circuit is designed to activate at above 4 volts. So anything between 4 and 5 volts will trigger the factory map or main calibration. The next circuit activates above 3 and less than 4, and so on down the tables.
With the switch not even installed (infinite resistance) the circuit will see 5 volts and default to the factory map.
Remember the other side of the switch is wired to ground in the ECM. As we decrease the resistance in the circuit we are in effect improving the ground and the voltage begins to drop as more of the current is allowed to flow through to ground.
Hope this helps.
Clear as mud?
Guy
The voltage parameters are totally adjustable. Look at table A0142-A0145.
The factory map has the highest resistance on the circuit with a 25K resistor. The factory map circuit is designed to activate at above 4 volts. So anything between 4 and 5 volts will trigger the factory map or main calibration. The next circuit activates above 3 and less than 4, and so on down the tables.
With the switch not even installed (infinite resistance) the circuit will see 5 volts and default to the factory map.
Remember the other side of the switch is wired to ground in the ECM. As we decrease the resistance in the circuit we are in effect improving the ground and the voltage begins to drop as more of the current is allowed to flow through to ground.
Hope this helps.
Clear as mud?
Guy
that is exactly what i was looking for. thanks guy. now it is as clear as mud.
but really now i understand how it works. the ecm is only monitoring the signal side not the ground side. i was thinking it was like monitoring a sensor signal were it has 3 wires a signal the return to ecm and ground. thanks a million. :hug: thats love in a non fruity kinda way.
For some reason my switch has 12 positions, 10 of which have resistance and 2 are open. Not sure why but the switch also has 3 terminals so I am guesing it is so you can rotate it clockwise or counterclockwise as desired for set-up. It just would appear the stopper inside must be broke.
Anyways this thread helped me figure it out so thought I would bump it up-good info. 25K is my all the way left position it appears-as is position 7!
Anyways this thread helped me figure it out so thought I would bump it up-good info. 25K is my all the way left position it appears-as is position 7!
For some reason my switch has 12 positions, 10 of which have resistance and 2 are open. Not sure why but the switch also has 3 terminals so I am guesing it is so you can rotate it clockwise or counterclockwise as desired for set-up. It just would appear the stopper inside must be broke.
Anyways this thread helped me figure it out so thought I would bump it up-good info. 25K is my all the way left position it appears-as is position 7!
Did you take the switch out of the dash and fix the little tab that gives you how many tunes you want?
if the voltage drops 1 volt per click then we run out of voltage after 5 , thus we can inly run 5 tunes right ?? why not have a tune between 5v and 4v, and 4v and 3v, like a 3.5v tune and a 4.5 v tune? or does it not work that way?
if the voltage drops 1 volt per click then we run out of voltage after 5 , thus we can inly run 5 tunes right ?? why not have a tune between 5v and 4v, and 4v and 3v, like a 3.5v tune and a 4.5 v tune? or does it not work that way?
Os only allows dsp2 or dsp5 tune options in ecm. Other than that just stock.
Don't forget to drill the second hole that keeps the switch from spinning..
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Ya I cut that off. There was no way I was going to be able to drill that hole let alone get it close to where it would line up.
It won't spin the way I have it wedged in there - My switch is square where the resistors mount to the board.