Raymond Foster Posted May 16, 2019 Report Share Posted May 16, 2019 Hi I have a g4+ extreme ecu wrx v1-2 plug in, in a 1990 rs legacy. Car starts fine run ok just this code won’t go away just want to know if it’s important and how do I fix. I clear the fault code it comes straight back an1 is for my map sensor. Also it won’t let me calibrate my map sensor also it says MAP SENSOR CALIBRATION COMAND FAILED: <5kpa or >5kpa of baro reading. Any help will do. Don’t want to reck my car is all Also in status for fault codes it says AN V1 at GND am I able to fix it or is this a buy a new map sensor. Also my map sensors not that old Quote Link to comment Share on other sites More sharing options...
Simon Posted May 16, 2019 Report Share Posted May 16, 2019 Yep that is going to be a critical error. It is either the map sensor has failed and shorted to ground. A wiring issue such as sensor is unplugged, Broken wires to / from sensor. Signal wire shorted to ground between sensor and ECU. Quote Link to comment Share on other sites More sharing options...
Raymond Foster Posted May 16, 2019 Author Report Share Posted May 16, 2019 thanks you. Would you recommend buying a new map sensor 1st or checking continuity on wires. FYI I’m a google auto electrician:):) Quote Link to comment Share on other sites More sharing options...
Raymond Foster Posted May 16, 2019 Author Report Share Posted May 16, 2019 Can anyone help with how to test map sensor through pc link I don’t know where to find the volts, vacuum etc on pc link Quote Link to comment Share on other sites More sharing options...
Simon Posted May 16, 2019 Report Share Posted May 16, 2019 You can test it at the sensor with a volt meter. With power to the sensor you need to measure the voltage on the signal wire it should change with pressure and vacuum want to see around 1.5Volts at rest moving up and down with pressure changes. The actual voltage will depend on the range of the map sensor. Quote Link to comment Share on other sites More sharing options...
Raymond Foster Posted May 16, 2019 Author Report Share Posted May 16, 2019 Thank for that I have back probed and tested my map sensor it shows 4.9v at rest. It is a link 3 bar map sensor also. I’m not sure but I’m sucking on a line very hard and am seeing no change in voltage. I’m not sure on parameters of map sensor but I’m sure I should see it change correct Quote Link to comment Share on other sites More sharing options...
Simon Posted May 16, 2019 Report Share Posted May 16, 2019 That sound like you have measured across the power supply and the signal or ground wire. You want to measure between the ground and the signal wire. Quote Link to comment Share on other sites More sharing options...
Raymond Foster Posted May 16, 2019 Author Report Share Posted May 16, 2019 Thank you Simon you have been a great help thus far. Yes u were correct I wasn’t reading the sensor wire I was testing the 5v. Additionally I would like to add code 11 says on my pc that it is low on negative . with map off I get full continuity on negative which is 0 on my multimeter. then turn map on continuity lessons to 1.2 on my multimeter. So I did test with map on sensor sits at 1.61v which I’m not sure is normal. Adding wen I suck I can get it down to 0.85v and wen blow I can get it to 1.82v. I’m not sure if this is normal or not. Would you suggest my map is working and it is a wiring issue any more detail will help. I just don’t wan to buy a map sensor to find out it wasn’t the issue. Thank you for your help Actually on testing continuity on negative while map on it jumps up and down but my buzzer for continuity doesn’t sound so I’m not sure if it’s a negative anymore or am I figuring out the issue here and it’s my negative wiring. I’m not sure at all if that’s how it is supposed to be Quote Link to comment Share on other sites More sharing options...
Simon Posted May 17, 2019 Report Share Posted May 17, 2019 That is good that would suggest the MAP sensor is happy. So we need to check the signal wire back to the ECU header. At the ECU connector you should get the same voltages. Pin 78 as marked is the map signal into the ECU check between ground and pin 78 and see if you have voltage. (This image is looking into the ECU from wire side ) I should check when you are clearing the code you are clearing the codes via the event log. And that your error voltages are correct. Quote Link to comment Share on other sites More sharing options...
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