stuck in open loop!

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  • 02stu
    E30 Modder
    • Jan 2005
    • 872
    #1

    stuck in open loop!

    I can not get my m50 to run in a closed loop. The o2 sensor is reading .5 or whatever the bottom of the voltage range is, and it is brand new. The only other code I have is the air temperature sensor which is reading 162C, I will replace that this week, could that be making it run in a open loop. What do the 2 female connectors on the o2 sensor harness need to be connected to?
    Tags: None
    • PiercedE30
      R3V Elite
      • Apr 2005
      • 4220
      #2
      162c = 323*F
      My 2.9L Build!

      Originally posted by Ernest Hemingway
      There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

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        • 02stu
          E30 Modder
          • Jan 2005
          • 872
          #3
          Originally posted by PiercedE30
          162c = 323*F
          I know that is why I am replacing it, however will that make it run in an open loop. If its running in an open loop will the DME even be looking at that value?

            Comment

            • matt
              No R3VLimiter
              • Oct 2003
              • 3731
              #4
              Open/closed loop refers only to O2 sensor feedback.

              The engine is referring to the IAT/MAF/CLT all the time.

                Comment

                • 02stu
                  E30 Modder
                  • Jan 2005
                  • 872
                  #5
                  Originally posted by matt
                  Open/closed loop refers only to O2 sensor feedback.

                  The engine is referring to the IAT/MAF/CLT all the time.
                  Thanks, I have been trying to figure that out for awhile. Is there any other variable with the o2 sensor that would be causing this, like the preheat relay or any wiring that was supposed to be done during the swap?
                  Thanks again Matt

                    Comment

                    • matt
                      No R3VLimiter
                      • Oct 2003
                      • 3731
                      #6
                      Not that I know of... the O2 sensor seems to hook up just to the M50 harness. Did you wire it properly? White to white, black to black, and the two grays can go either way since the heater is a resistive element.

                      Now... having wildly "off" values of the other sensors might prevent the DME from going into closed loop... not sure. I'll ask Mike when I get a chance.

                        Comment

                        • 02stu
                          E30 Modder
                          • Jan 2005
                          • 872
                          #7
                          Originally posted by matt
                          Not that I know of... the O2 sensor seems to hook up just to the M50 harness. Did you wire it properly? White to white, black to black, and the two grays can go either way since the heater is a resistive element.

                          Now... having wildly "off" values of the other sensors might prevent the DME from going into closed loop... not sure. I'll ask Mike when I get a chance.
                          All I did was screw the o2 connector to the harness as you would when replacing a o2 sensor in an e36

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