ktloah Posted June 25 Share Posted June 25 My 04 Dynasty is at DDA repair for a speed sensor failure. Does anyone know where the ECM for the transmission is located? Any info would help...Thanks Link to comment Share on other sites More sharing options...
vito.a Posted June 25 Share Posted June 25 The Allison ECU and the HWH leveling computer are attached to the basement ceiling in the main basement compartment where the inverter is located. You'll need to remove the black felt/plywood ceiling cover to access them. Make sure you check the wire connecter on the front of the Allison. Link to comment Share on other sites More sharing options...
Frank McElroy Posted June 25 Share Posted June 25 It's likely in the ceiling between the frame rails in the first storage bin behind the front fuel tank. You will need to unscrew this center ceiling cover to gain access Link to comment Share on other sites More sharing options...
ktloah Posted June 25 Author Share Posted June 25 Thanks Frank, when replacing the speed sensor I assume they need to program it to the ECM? DDA is wanting to know this. Thanks, I'll relay that this is possibly where it is Link to comment Share on other sites More sharing options...
Solution Frank McElroy Posted June 25 Solution Share Posted June 25 Likely they don't need access to the transmission ECM to replace the sensor. Electronic access to the transmission computer should be via the rear databus port using the Allison software. The transmission should be on the same databus diagnostic port as the engine. The rear databus port is in the engine bay on the passenger side below the RRB (rear run bay electrical panel box). Link to comment Share on other sites More sharing options...
ktloah Posted June 25 Author Share Posted June 25 Thankyou for the info Frank...love this group!! 1 Link to comment Share on other sites More sharing options...
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