Mapsensor

fastfun

Supercharged
Joined
Jun 12, 2017
Messages
259
Location
Netherlands
Ride
triumph roadster supercharged, 2010
Is some one familiar with the wiring of the mapsensor ?(Triumph R III Roadster) Let me explain : I'm intending to install a Bosch 3 bar mapsensor because of the chargerpressure. However, I still have some doubts about 1 wire from the stock mapsensor connector that I have to connect to the ground wire of the Bosch mapsensor. So my question : is someody familiar with which is the ground wire in the stock map sensor ? btw. wire no 1 is showing 0.11 volts, wire no 2 is showing 4.14 volts and wire no 3 is showing 5.08 volts. Thanks !
 
I am not at the shop where all my info is at but I think that #1 is the the ground.
You can confirm this by volts from #3 to #1 should get 5 volts
#3 to ground or bat neg post 5 volts should confirm #1 as map sensor ground provided you are on the map sensor.
 
Thanks . I will check the combinations. Keep you posted.
 
Last edited:
Kevin frazier said:
Click to expand...
Thanks. However I don't get the link between your posted auxilliary and accessory circuit diagram and the map sensor circuit. e.g. no 15 in that auxilliary/accessory diagram is the direction indicator unit while no 15 in the complete electrical system diagram stands for the mapsensor.
 
5 volts is a reference voltage from the ecu and a few components use that voltage like tps, tip over ect
The ecu will set a code if it a lot lower and maybe if it is a lot higher. Kinda like saying a cup of coffee is full when it is not at the prime. So no problem with 4.98
#1 is ground
#2 is the voltage being sent to ecu
#3 is the map reference voltage Approx 5 volts
 

(Um, I get some issue with posting my answer under your reaction) Well, I have a try once again . So meanwhile I did have a check on the 3 wires/ports.
Wire/port no 3 to no 1 is showing a 4.98 volts
Wire/port no 3 to ground/neg batt is showing still a 5.08 volts
Wire/port no 1 to ground is still showing a 0.11 volts and another check a did :
Wire/port no 1 to wire/port no 2 is showing a 4.05 volts.
So could the current difference between 4.98 and the 'required' 5 volts become an issue.
 
 
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