Subaru Outback not start after flameout

  A mileage of about 56,000 km of the 2011 Subaru Outback. Customer reflect: the car has traveled 55213km, suddenly appeared a few days ago with the way the fault lamp is lit, the flame can not be started again after step aside, stop check request.
     Troubleshooting: Customer stop after an appointment, arrange for service technicians to check on the car, using SM3 diagnostic check engine diagnostic system, found fault code display P0890 AT self-closing relay failure. In order to determine whether the obd2 scanner occasional failure, so maintenance technicians will remove the fault code, then open the key, the vehicle a smooth start.
     Repair phenomenon seems different now, and then accompany clients road test also found no abnormalities, are occasional unexplained fault really? Unexpectedly, when the pit by a deceleration zone, bumped observed AT OIL flash on the instrument, and then turn off the vehicle into the shop, connected to diagnostic trouble code check, or initial fault code.
     When trying to start the vehicle again and found that the vehicle has been unable to start, just to hear the starter there, "da da da" sound. Erupted fault though reproduction, but the technician thought it might be battery power loss or power generator is not caused. Borrowing a new battery from the warehouse, but still can not start after installed.
     Honestly in accordance with DTC, it was discovered that the fault code relay is actually referring to TCM's power supply.
     Check the relay lines are good, also found no loose phenomenon, taken down to check on the relay itself, static testing and dynamic testing were also normal. At this point we doubt whether there is poor contact TCM itself inside the phenomenon exists, but did not because of the site which models TCM, so had to relay and TCM loading, try a hand car diagnsotic tool to shake these two components were tested, shaking and tapping TCM, failure did not occur, but beat the relay when, AT OIL suddenly lit on the instrument, then immediately turn off the engine while the vehicle can not be started again.
     Then you can say to the failed component was finally determined, that is the relay inside the TCM has a loose place, when after a bumpy road this failure phenomenon will occur. Replacing a relay troubleshooting.
       Failure Summary: regular maintenance in the mouth, when faced some failure, failure to follow judge's logic, especially when there has been relatively clear diagnostic trouble codes do reference, do not be ignored.
     In this case because of maintenance technicians with experience from start machine "da da" sound, derived battery failure, so take a detour.
       After three packs of policies for our maintenance work is also a test of the vehicle to be repaired in a short time, then determine the fault is particularly important.
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