2015 RS265 Not starting after engine swap

Discussion in 'Electrical & Interior - Security, ICE, Wiring Loom' started by Mark Abbott, Mar 5, 2025.

  1. Hi all,

    We have a completely stock 2015 RS265 that we picked up for cheap as it had a broken cambelt (alternator belt fell apart and dropped into the crank pulley teeth)

    We sourced and installed a RS250 long block, changed the cambelt (using the proper cam locking tools), etc and installed it using the original harness & sensors.

    The problem is that it's injectors aren't pulsing, the engine runs perfectly off spray, there are zero stored codes and we're running out of ideas! We've switched out the cam and crank sensors, have manually fired the injectors using a jump harness and they all work just fine.

    The hot side of the injectors is just fine as well, the immobiliser seems to be inactive.

    Is there a specific ground circuit for the injectors that goes to the ecu?

    Anyone else had this issue?
     
  2. I haven't had the problem but the following documents may help you troubleshoot
    The grounding map does show different earth points for engine (E) and injection(Y) - though I think "injection" for the French, refers to the EMS as a whole, not specifically the injectors.

    If you have access to DDT4All or Clip etc, you can work through engine start/run permissives, just to make sure its not a "logic" problem thats stopping the injectors from firing
    Earthing point_map.jpg Earthing point_legend.jpg DDT4all_ems_general engine.png DDT4all_ems_immob and protected state.png DDT4all_ems_injection time.png
     

    Attached Files:

  3. Thanks for such a comprehensive response! (It's been driving us crazy)
     

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