2004 Honda Pilot EXFACTORY OEM SERVICE PROCEDURE

DTC P0451: FTP Sensor Range/Performance Problem

Special Tools Required  Vacuum Pump/Gauge, 0-30 in.Hg A973X-041-XXXXX

  1. Remove the fuel fill cap.
  2. Turn the ignition switch ON (II).
  3. Monitor the FTP sensor voltage with the scan tool or the HDS, or measure voltage between PCM connector terminals A29 and C18.
    Fig 1: Measuring Voltage Between PCM Connector Terminals A29 & C18
    G01464236Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.5 V? 

    1. YES  -Go to step 4.
    2. NO  -Replace the FTP sensor.
  4. Turn the ignition switch OFF.
  5. Remove the EVAP canister cover (see step 1 on EVAP Canister Replacement  ).
  6. Disconnect the hose between the EVAP two way valve and the FTP sensor at the EVAP two way valve end.
  7. Connect a vacuum pump to the open end of that hose.
    Fig 2: Connecting Vacuum Pump
    G01464237Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the ignition switch ON (II).
    9. NOTE: Do not apply too much vacuum or you will damage the FTP sensor.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.