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Connecting a Map sensor vacuum

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Old 08-01-2011, 05:00 PM
  #16  
Lizard928
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Thinking about it, it should be linear from 0kPa to 104kPa 0V - 5V
I dont know if more vacuum is more volts or less though.
Old 08-01-2011, 05:37 PM
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No you were right because I checked the manual and they say at sea level it should read 101Kpa.

A=ground
B=signal
C=5volts
Soooo I did a resistance check from A-C (2.08)and then from A-B (4.56)and C-B(6.65)ohms
The higher resistance is in the wrong spot?
I connected it up with the Power and ground swaped and wala!! 4.8 volts

I am going to hook it up with the A-C wires swapped
What do you think?
Old 08-01-2011, 07:05 PM
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Lizard928
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I am not familiar with your MAP sensor to figure out as to which wires go where.

Get the specs for the MAP sensor and figure out what the input/output wires are.

Is it possible that you have a 5 wire MAP sensor and you have just counted from the wrong end?
eg ABCDE is how you counted it, when it should be EDCBA.....
Old 08-02-2011, 01:10 AM
  #19  
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Colin I am getting a goo map signal now.
Thanks a lot for your help as I would have never guessed the map was wired backwards, as per the Tec-GT instructions I might add.

Anyway Thanks a lot Colin.

Brad
Old 08-02-2011, 06:57 AM
  #20  
Lizard928
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What is your MAP signal at now when the car is off, and at idle.

Please also confirm what the computer reads vs a vacuum gauge.
Old 08-03-2011, 01:42 PM
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Originally Posted by Lizard931
What is your MAP signal at now when the car is off, and at idle.

Please also confirm what the computer reads vs a vacuum gauge.
I found the problem, well I sould say that Electromotive found the problem.

Thumbs up to them. I assume that 928 MS puts the kit together from components that they buy. This kit had a 3 bar MAP sensor in it for a boosted car.
Here is the replay from the TEC-GT fourm

Uwe@EMI wrote:

Figured I would chime in. The wiring diagram that is shown in the manual is absolutely correct. As for the part number you listed in the email, this is for a 3 BAR sensor. If the program in the TECgt was set up for a 1 BAR sensor, then the reading you originally got would make sense. If the engine is not boosted, you may have received the incorrect MAP sensor. The orange connector is a dead giveaway that the sensor is not a 1 BAR, as they use a green connector with a different key. Hope this helps clear things up!



-Uwe
I have a 3 bar instead of a 1 bar map sensor.
weeks of tuning down the drain.
Brad
Old 08-03-2011, 02:13 PM
  #22  
Lizard928
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As I said origonally, calibrate the unit. Had you calibrated it, it should have then realised that its a 3 bar
Old 08-03-2011, 05:37 PM
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Originally Posted by Lizard931
As I said origonally, calibrate the unit. Had you calibrated it, it should have then realised that its a 3 bar
Can you explain further. The map sensor itself can not be calibrated so I assume you mean try the different 1 bar, 2 bar, 3 bar, Map sensor styles in the drop down box (which I did with no change)
Please go into more detail colin



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