2006 Honda CR-V EX, 2.4 RD6FACTORY OEM SERVICE PROCEDURE

DTC P0451: FTP Sensor Circuit Range/ Performance Problem

NOTE: If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422 first, then recheck for DTC P0451.
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine, and let it idle 1 minute.
  4. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    1. YES -  Go to step 5.
    2. NO -  If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and the ECM/PCM. If the screen indicates NOT COMPLETED, go to step  3 and recheck.
  5. Turn the ignition switch OFF.
  6. Replace the FTP sensor (see FTP SENSOR REPLACEMENT  ).
  7. Turn the ignition switch ON (II).
  8. Reset the ECM/PCM with the HDS.
  9. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  10. Start the engine, and let it idle 1 minute.
  11. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES -  If DTC P0451 is indicated, check for poor connections or loose terminals at the FTP sensor and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO -  Go to step 12.
  12. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    1. YES -  Troubleshooting is complete.
    2. NO -  If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the ECM/PCM, then go to step  1. If the screen indicates NOT COMPLETED, go to step  10 and recheck.
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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.

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