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99 Dodge 3500 auto throws code for no com from pump to ecm it’ll run with ecm bypassed all wireing checks put a ecm off of a 2000standard still nothing 


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I'm going to assume you are talking about the P1689 code. There is a few things that can cause that code. 


Possible Causes

  • Wiring & Connectors
  • Fuel Injection Pump Relay Output Circuit Open
  • Ground Circuit Open Or High Resistance
  • Datalink (+) Circuit Open
  • Datalink (+) Circuit Shorted To Ground
  • Datalink (-) Open
  • Datalink (-) Shorted To Ground
  • ECM

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