I hate wiring, Help me 4x4 my IX! No Spark, FML

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  • JakeP
    Grease Monkey
    • Oct 2010
    • 315

    #31
    Thanks Matt. If I get one before then, I'll let you know.

    Comment

    • accident
      R3V OG
      • Sep 2008
      • 7303

      #32
      i have a spare ignition switch.

      Originally posted by ROLLingKING
      i have a bronzit and plan on making it look sweet.
      Originally posted by slammin.e28
      Moral of this story?

      If you drive your e30 on stairs, you're gonna have a bad time.

      Comment

      • nando
        Moderator
        • Nov 2003
        • 34827

        #33
        Originally posted by dark89e30
        Just because you have continuity to ground does not mean you have good ground. You'd have to measure voltage drop under load to determine that. If your coil is not getting batt positive, its prob a 90% chance the ignition switch is the problem, just based on that. Pin 18 is hot at all times, pin 27 is the dme turn on lead and splits to the coil AFTER the ignition switch. Go buy a NEW ignition switch.
        but pin 18 at the C101 is working and that is hot from the switch.
        Build thread

        Bimmerlabs

        Comment

        • dark89e30
          Wrencher
          • Jul 2007
          • 263

          #34
          Originally posted by nando
          but pin 18 at the C101 is working and that is hot from the switch.
          The Alldata wiring diagram shows pin 18 hot at all times, not through switch. Do you have one that says different? Maybe a factory book?


          Here's what I'm going off of.

          Comment

          • nando
            Moderator
            • Nov 2003
            • 34827

            #35
            Originally posted by nando
            but pin 18 at the C101 is working and that is hot from the switch.
            I think you are missing that part, I'm not talking about pin 18 at the motronic connector.

            pin 7 of the C101 is also switched 12v from the ignition switch (and connects to pin 27 at motronic).

            although I realized he should be testing pin 7 and not 18, as 18 is only hot when you are trying to crank the motor. I just glanced at my C101 chart and saw that 18 went to the switch.
            Build thread

            Bimmerlabs

            Comment

            • JakeP
              Grease Monkey
              • Oct 2010
              • 315

              #36
              In the following posts, you're talking about the round connector on the firewall? On the round connector, (C101?) What pin is #18?

              I traced the pin 27 all the way through that connector to the plug near the brake pedal using the ohm-meter on my multimeter, so that wire is continuous. Hopefully we can get this hammered out tomorrow so I can take it out for a test drive.

              I think this is a connector for an e21, but I'll just use the diagram. I believe I traced the pin from the ECU to #8 on this diagram...



              Originally posted by nando
              the switch could be bad, yes. the ignition switch also powers the coil and FP relay.

              you can check pin 18 on the C101 connector, it should be hot with the key turned on.
              Originally posted by nando
              well you can just check for voltage at pin 18 of the C101 with the key on. I think you can uplug the engine harness side of the C101 for that.

              the C101 is a round 20 pin connector on the firewall above the brake booster. the top portion of the plug goes to the engine harness, the bottom portion to the body harness.
              Originally posted by nando
              then the switch isn't the issue.

              How about the pin itself, is it clean? can you check continuity/resistance from the engine harness side of pin 18 to pin 27 of the motronic connector?

              heres another one - are you sure the main relay works? since the ECU turns on the FP relay, without a working main relay the FP will not work.

              Comment

              • JakeP
                Grease Monkey
                • Oct 2010
                • 315

                #37
                Put a new ignition switch in. Still no power at pin 27 of the DME connector.

                Comment

                • DaveSmed
                  E30 Fanatic
                  • Apr 2007
                  • 1406

                  #38
                  No power at pin 27?

                  What is your OBC up to?
                  -Dave
                  2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

                  Need some help figuring out the ETM?

                  Comment

                  • JakeP
                    Grease Monkey
                    • Oct 2010
                    • 315

                    #39
                    Originally posted by DaveSmed
                    No power at pin 27?

                    What is your OBC up to?
                    Huh?

                    Comment

                    • DaveSmed
                      E30 Fanatic
                      • Apr 2007
                      • 1406

                      #40
                      The little clock mileage computer thing next to the radio. Also happens to be the thing that controls the black box by the clutch pedal.
                      -Dave
                      2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

                      Need some help figuring out the ETM?

                      Comment

                      • DaveSmed
                        E30 Fanatic
                        • Apr 2007
                        • 1406

                        #41
                        Also, what year is the car?

                        Specifically, Do you have this connector?
                        Attached Files
                        Last edited by DaveSmed; 10-24-2010, 02:55 PM.
                        -Dave
                        2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

                        Need some help figuring out the ETM?

                        Comment

                        • JakeP
                          Grease Monkey
                          • Oct 2010
                          • 315

                          #42
                          The car is an 88. I'll be by the shop tomorrow afternoon, I'll look for that connector then. I have 2 unplugged connectors near the black box that I can't ID either.

                          Comment

                          • JakeP
                            Grease Monkey
                            • Oct 2010
                            • 315

                            #43
                            Would the OBC cause the car to not start? or honk once when the key turns on and off?

                            Nope, don't have that exact connector. I have this one:

                            Comment

                            • delphini
                              Mod Crazy
                              • Apr 2006
                              • 680

                              #44
                              YES , the obc if its the 13 button variety will cause a no start condition ..... remember that the security device with the security code prevents the car from being started if it is enabled. Get a new black box and your problem is solved .
                              :pimp:

                              Comment

                              • JakeP
                                Grease Monkey
                                • Oct 2010
                                • 315

                                #45
                                Hmmmm. I'll pull the radio panel and see what I can do. I may be able to find a replacement if need be. Should it light up when the key is turned on? Mine doesn't.

                                Comment

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