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P0504 - Brake Switch Correlation

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0504 - BRAKE SWITCH CORRELATION

Description:  The PCM does a comparison test between the brake pedal switch and the brake pedal position switch.
Possible Causes: 
  • Damaged brake switch
  • Open or short in the BPS circuit
  • Open or short in the BPP circuit
Diagnostic Aids:  Check the state of PID BPS and PID BPP. BPS is normally closed and BPP is normally open.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST FD .
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