| Author | Topic |
|---|
Location:
Sydney
Registered:
October 2003
|
|
Makeshift map sensor
|
Fri, 27 August 2004 00:26
|
 |
In looking for a map sensor for a gen2 3sgte (AFM), I had this reply.
This sounds pretty good, and negates the need for a FCD too.
From the mr2 board:
http://www.mr2oc.com/newreply.php?s=&action=ne wreply&postid=422533
| Quote: |
posted by JimKing
| Quote: |
posted by Driftin_AW
sweet so all you need is a resistor. Just need to find what resistance the stock one has around 0psi and get one to suit, or get a variable resistor and turn it until the computer doesnt' start in limp mode, but not so far that you get boost cut constantly.
|
To carry off this deception, you probably want to use a resistor "bridge". You use two resistors in series wired between ground and the +5v MAP sensor supply. You connect the MAP signal wire to the junction between the two resistors. The junction voltage is proportional to the resistances.
Vj = R2 / (R1 + R2) * 5.0v, assuming R2 is connected to the 5v supply, and R1 is connected to GND.
A two bar map sensor should read about 2.5v at 0.0psi, so if you want to simulate that, then a couple 10k ohm resistors should do.
See if this artwork helps:
.........R1.....................R2
.
..|-\/\/\/\/\-O-/\/\/\/\/-|
..|......................|.....................|
..|......................|.....................|
.GND...............Vj...................+5V
............(to ECU PIM input)
|
|
|
|
| | Subject | Poster | Date |
|---|
 |
Makeshift map sensor
|
davedave | Fri, 27 August 2004 00:26 |
