Guest Posted November 29, 2013 Share Posted November 29, 2013 An auto electrical engineer was surprised to find the MAP sensor vacuum pipe on my 150 Sigma engine was capped off but was still connected electrically. The car runs fine and has been inspected by Caterham post build. Can anyone explain the reason behind this? Thanks Pete Link to comment Share on other sites More sharing options...
ChrisC Posted November 30, 2013 Share Posted November 30, 2013 It's my understanding that the MAP sensor information was removed from the latest ECU maps for the 150, so a am not suprised by your configuration. I suspect it was easier to leave the redundant sensor in the loom instead of creating a new engine loom. Edited by - ChrisC on 30 Nov 2013 08:16:16 Link to comment Share on other sites More sharing options...
Guest Posted November 30, 2013 Share Posted November 30, 2013 thanks Chris I thought it must have been intentional but couldn't see the reason Pete Link to comment Share on other sites More sharing options...
Mr Locust Posted November 30, 2013 Share Posted November 30, 2013 If not connected to the engine, is it being used to to check barometric pressure in this application? Link to comment Share on other sites More sharing options...
ChrisC Posted November 30, 2013 Share Posted November 30, 2013 I understand the ECU does not use any information on manifold pressure, only throttle position, after the final changes made for drivability. These being Change in throttle quadrant (larger) Map change Remove MAP Sensor Stronger throttle return spring Changes to cam belt tensioner Link to comment Share on other sites More sharing options...
Jason Plato Posted November 30, 2013 Share Posted November 30, 2013 it will need a map sensor if you go to the alps ! Link to comment Share on other sites More sharing options...
ChrisC Posted November 30, 2013 Share Posted November 30, 2013 No if the ECU ignores all the information coming from it. Edited by - ChrisC on 30 Nov 2013 16:57:02 Link to comment Share on other sites More sharing options...
Jason Plato Posted November 30, 2013 Share Posted November 30, 2013 so how is the fuelling going to be reduced then ? if the map sensor is not present ? Link to comment Share on other sites More sharing options...
DJ. Posted November 30, 2013 Share Posted November 30, 2013 Quoting Dave Jackson: so how is the fuelling going to be reduced then ? if the map sensor is not present ? Good question. Duncan Link to comment Share on other sites More sharing options...
ChrisC Posted November 30, 2013 Share Posted November 30, 2013 Don't shoot the messenger, the MAP Sensor was remove with the 150 map version H here since 2009 Edited by - ChrisC on 30 Nov 2013 20:13:30 Link to comment Share on other sites More sharing options...
7 wonders of the world Posted November 30, 2013 Share Posted November 30, 2013 The ECU can adjust fuelling by use of either/or hot wire air flow meter and the use of dual lambda sensor pre and post cat. The pre cat one registers fuel emissions before the cat and is best placed to keep fueling within prescribed limits. Link to comment Share on other sites More sharing options...
geko Posted November 30, 2013 Share Posted November 30, 2013 Hi, the map sensor (if still connected) or a internal pressure sensor in the ECU can also measure the barometric pressure to correct the fuel mapping for high altitude. It is a matter of the ECU map to change the sensor inputs from MAP to barometric correction. Edited by - geko on 30 Nov 2013 21:42:45 Link to comment Share on other sites More sharing options...
Beejay993 Posted July 24, 2014 Share Posted July 24, 2014 Hi, does anyone know if you can only buy the MAP sensor directly from Caterham or can it be purchased directly from Ford ? I presume it's a Delphi part...? Link to comment Share on other sites More sharing options...
John Hughes Posted July 24, 2014 Share Posted July 24, 2014 The fuel is calculated by the tps / engine speed, there are then correction factors applied relating to engine coolant temp, air intake temp, alternator voltage, barometric pressure (map sensor) Lambda under certain conditions. As far as I can tell the map sensor is used in certain Vauxhalls and Volvos They can be got from eBay cheaply but a check with Easimap is useful to confirm they are giving the right output. Edited by - John Hughes on 24 Jul 2014 20:29:48 Link to comment Share on other sites More sharing options...
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