Speedometer Signal Code P0505

Discussion in 'Tech Tips, Instructions and Service Bulletins' started by glider., Jul 23, 2007.

  1. glider.

    glider. BOT Machine

    June 17, 2002

    Speedometer Signal and Code P0505
    The speedometer signal is an extremely important input for the Delphi fuel
    injection system. The ECM monitors throttle position and speed signal inputs in
    order to properly maintain the set idle speed. If the ECM loses the speed signal
    for any reason while the throttle is closed, the ECM assumes the vehicle is
    stopped and will adjust the idle air control counts to bring engine rpm to the set
    idle speed. This could set a P0505 code and adversely affect engine idle.