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  • Trans ECU not talking anymore.

    U1120 code
    Cannot do anything like an auto reset or injector relearn (trans temp depandant)
    Watching data from the auto is hit ans miss with comms errors all the time. With mut.

    Any sugestions. New/ second hand trans ecu about $200. Might start with the loom.

    Any suggestions I'm all ears (or eyes).
    .Previously an NP GLX 3.8 auto RIP
    NS VRX DiD auto. RIP.

  • #2
    Sorry Goodsy, I do not have the Service Manual for your Paj, so I do not know what you fault code is. However if it is a "communication" error it will be caused by a high resistance across one or more connection, and most likely a plug. Best way to check is to come in with your multimeter probes from the back of each plug and measure the resistance across the connected plug.
    Circuit must not be live, so disconnect the battery/s and pull the multi pin connector out of the AT ECU. If you have a fault that you can reset and then re-triggers, then this will be an intermittent connection or connections fault which is difficult to find.

    Best of luck.

    cheers, old Jack.
    2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
    MM4x4 Auto Mate, Serial No 1 .

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    • #3
      Doesn't really effect the driving at all. I just cannot do certain things to the auto.
      Still drives fine, but seems a bit reluctant to change down. Manual mode sorts that.

      Fun Fun.
      .Previously an NP GLX 3.8 auto RIP
      NS VRX DiD auto. RIP.

      Comment


      • #4
        Do you still have your front CV removed?

        AT ECU could read it as a malfunction.
        NS Pajero Exceed. With stuff

        Comment


        • #5
          This might help

          http://pajero.2de.ru/22/html/M122110940002500ENG.HTM
          NS Pajero Exceed. With stuff

          Comment


          • #6
            Main ECU is not talking to the AT ECU. Comms error.
            Either. Main ECU, AT ECU or a bad joint somewhere in the loom. Hoping for the later but going to be a bitch to fault find.
            Has nothing to do with CV. They don't do much when stationary.

            Thanks Nick. Have done a lot of reading. The U1120 code can be a bit of a red herring but I know where to start looking. Will run a can bus check this arvo
            Also the center CD light flashes when stopped. Another clue.
            As I said it's not stopping me and throws no cels just annoying.
            I want to do an auto reset but cannot as the mut cannot connect with the AT ECU.
            .Previously an NP GLX 3.8 auto RIP
            NS VRX DiD auto. RIP.

            Comment


            • #7
              the problem you have is can bus related


              Terminator for the bus is astc ecu and combination meter.

              make sure can lines are not shorted in any way

              can you talk to atsc and imo ecu
              can isn't completely stuffed as mutt can talk to engine ecu and thats done via can bus
              looks isolated to transecu check the ecu

              Trans ecu is under passenger foot well make sure its clean and not wet or anything

              so on the first screen of the mutt the is can bus get see what it says

              did you fit yr own tc lockup kit and tampered with trans ecu loom ?


              Yann

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              • #8
                Will test all when I get home.
                As for the trans lockup kit. I have removed it and joined the only wire you have to break.
                Was working fine. Will plug the mut back in and run tests.
                Will report back! Did spill a can of coke in the passenger foot well. Will pull her apart again tonight.
                ECU would be the easiest option. Only $180 for a replacement.

                We'll see.
                .Previously an NP GLX 3.8 auto RIP
                NS VRX DiD auto. RIP.

                Comment


                • #9
                  As a side note I still get all AT readings on the mut. All read ok but Comms drop out every 5 seconds or so and back to normal.
                  .Previously an NP GLX 3.8 auto RIP
                  NS VRX DiD auto. RIP.

                  Comment


                  • #10
                    Originally posted by pasniny View Post
                    looks isolated to transecu check the ecu

                    Trans ecu is under passenger foot well make sure its clean and not wet or anything



                    Yann
                    This on the left hand side of foot well. Saves looking at the manual.

                    Cheers
                    .Previously an NP GLX 3.8 auto RIP
                    NS VRX DiD auto. RIP.

                    Comment


                    • #11
                      Just ran a can bus test results below.

                      Big pic. Sorry



                      So where would you start looking for this? Learning the hard way here.

                      Where is NG?
                      .Previously an NP GLX 3.8 auto RIP
                      NS VRX DiD auto. RIP.

                      Comment


                      • #12
                        No idea now. Acording to above I have a problem with my ASTC ECU and not the AT ECU connections.

                        Just did an injector relearn.
                        I see that under the system select that AT and TC are in the same system. Is this traction control or something different?



                        Also did a self diagnosis on the METER and ASTC. All good. NFI
                        .Previously an NP GLX 3.8 auto RIP
                        NS VRX DiD auto. RIP.

                        Comment


                        • #13
                          The terminating resistors help to keep the CAN bus "balanced" - I'm not sure they're essential to operation, but the system doesn't work as well without them. They're normally built in to specific devices on the bus, which in your case, appears to be ASTC and Meter.

                          The diagnostic checks you're performing are testing responses of the individual units, a sort of "challenge - response" test - the MUT sends out a certain command or query, and checks for the appropriate response.

                          The brains inside each of these devices is working properly, providing the appropriate response, so there's nothing wrong with them from that respect. But it is detecting something wrong, probably something like an unusually high error rate, which it guesses is an error with the impedance of the system.

                          As old Jack said, possibly a dud (high impedance) connection in a plug & socket somewhere, or it could be something (spilled coke?) creating an unwanted impedance path between two pins?
                          NT Platinum. DiD Auto with 265/70R17 ST Maxx, Lift, Lockers, Lockup Mate, Low range reduction, LRA Aux tank, bull bar, winch, lots of touring stuff. Flappy paddles. MMCS is gone!

                          Project: NJ SWB. 285/75R16 ST Maxx, 2" OME suspension, 2" body lift, ARB 110, 120l tank, bullbar, scratches, no major dents. Fully engineered in SA. NW DiD & auto in place - a long way to go....

                          Scorpro Explorer Box

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                          • #14
                            With the location of the ASTC ESC being in the center console and the METER ESC located god knows where I'm starting to think I've had this fault a long time and only getting a Mutt showed it up.
                            .Previously an NP GLX 3.8 auto RIP
                            NS VRX DiD auto. RIP.

                            Comment


                            • #15
                              New symptom. ASC now kicks in at about 5k's an hour and limits throttle only.
                              Traction control working as normal. No other lights only car skidding light and no throttle.

                              Looking like an ATSC ESC atm.......
                              .Previously an NP GLX 3.8 auto RIP
                              NS VRX DiD auto. RIP.

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