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DTC P1458: FTP Sensor Circuit Range/Performance Problem

Special Tools Required 

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Note these recorded on-board snapshot parameters with the HDS:
    • Max Value of FTP SENSOR
    • Min Value of FTP SENSOR
    • FUEL LEVEL

    HDS on-board snapshot screen 

    Fig 1: Showing HDS On-Board Snapshot Screen
    G08069921Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Check the FUEL LEVEL in the DATA LIST with the HDS.

    Is the FUEL LEVEL less than it is in the on- board snapshot? 

    YES  - Go to step 4.

    NO  - Drain the fuel until the FUEL LEVEL is less than it is in the on-board snapshot, then go to step 4.

  4. Take a snapshot with the HDS for 3 minutes without starting the engine.
  5. Check these recorded snapshot parameters with the HDS:
    • Max Value of FTP SENSOR (FINE)
    • Min Value of FTP SENSOR (FINE)

    HDS snapshot screen 

    Fig 2: Showing HDS Snapshot Screen
    G08069922Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the difference between the MAX and MIN values of the FTP SENSOR (FINE) about 0.67 kPa (0.2 inHg, 5 mmHg) or less? 

    YES  - Go to step 6.

    NO  - Go to step  12.

  6. Check the FTP SENSOR (FINE) in the recorded snapshot with the HDS.

    Does it vary 0.067 kPa (0.02 inHg, 0.5 mmHg) or more for 3 seconds? 

    YES  - Go to step 7.

    NO  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the ECM/PCM. Also check for a blockage in the EVAP vent hose.

  7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the ON mode.
  8. Remove the FTP sensor.
  9. Reconnect the FTP sensor 3P connector.
  10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  11. Check the FTP SENSOR (FINE) in the DATA LIST with the HDS.

    Does it vary 0.067 kPa (0.02 inHg, 0.5 mmHg) or more for 3 seconds? 

    YES  - Replace the FTP sensor; with SH-AWD (see WITH SH-AWD  ), without SH-AWD (see FTP SENSOR REPLACEMENT  ), then go to step  28.

    NO  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the ECM/PCM. Also check for a blockage in the EVAP vent hose.

  12. Remove the fuel fill cap.
  13. Check the FTP SENSOR (FINE) in the DATA LIST with the HDS.

    Is the value about 0.67 kPa (0.2 inHg, 5 mmHg) or more, or about - 0.67 kPa (- 0.2 inHg, - 5 mmHg) or less? 

    YES  - Reinstall the fuel fill cap, then go to step  22.

    NO  - Go to step 14.

  14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the ON mode.
  15. Remove the FTP sensor.
  16. Reconnect the FTP sensor 3P connector.
  17. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  18. Check the FTP SENSOR (FINE) in the DATA LIST with the HDS.

    Is the value about 0.67 kPa (0.2 inHg, 5 mmHg) or more, or about - 0.67 kPa (- 0.2 inHg, - 5 mmHg) or less? 

    YES  - Remove the blockage in the EVAP vent hose, and replace it if needed, then go to step  26.

    NO  - Go to step 19.

  19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the ON mode.
  20. Disconnect the FTP sensor 3P connector.
  21. Check for a blockage or damage at the FTP sensor ports (EVAP canister side and vent side).
    Fig 3: Checking Blockage Or Damage At FTP Sensor Ports
    G08069923Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there any blockage or damage? 

    YES  - Remove the blockage, and replace the FTP sensor if needed; with SH-AWD (see WITH SH-AWD  ), without SH-AWD (see FTP SENSOR REPLACEMENT  ), then go to step  28.

    NO  - Replace the FTP sensor; with SH-AWD (see WITH SH-AWD  ), without SH-AWD (see FTP SENSOR REPLACEMENT  ), then go to step  28.

  22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the ON mode.
  23. Disconnect the fresh air hose (A) from the EVAP canister (B), then connect a vacuum pump/gauge, 0- 30 inHg, to the EVAP vent shut valve as shown.

    With SH-AWD 

    Fig 4: Identifying Fresh Air Hose And EVAP Canister (With SH-AWD)
    G08069924Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Without SH-AWD 

    Fig 5: Identifying Fresh Air Hose And EVAP Canister (Without SH-AWD)
    G08069925Courtesy of AMERICAN HONDA MOTOR CO., INC.
  24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  25. Try to apply vacuum to the valve (not more than 5.3 kPa (1.6 inHg, 40 mmHg)) while checking the FTP SENSOR (FINE) in the DATA LIST with the HDS.
    NOTE: To avoid damaging the FTP sensor, do not apply more than 5.3 kPa (1.6 inHg, 40 mmHg) of vacuum.

    Does the valve hold more than 1.3 kPa (0.4 inHg, 10 mmHg) of vacuum? 

    YES  - Replace the EVAP canister vent shut valve; with SH-AWD (see WITH SH-AWD  ), without SH-AWD (see WITH SH-AWD  ), then go to step 26.

    NO  - Remove the blockage in the fresh air hose, and replace it if needed, then go to step 26.

  26. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the ON mode.
  27. Reconnect all connectors and the fresh air hose.
  28. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  29. Reset the ECM/PCM with the HDS.
  30. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  31. Take a snapshot with the HDS for 3 minutes without starting the engine.
  32. Check these recorded snapshot parameters with the HDS:
    • Max Value of FTP SENSOR (FINE)
    • Min Value of FTP SENSOR (FINE)

    HDS snapshot screen 

    Fig 6: Showing HDS Snapshot Screen
    G08069926Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the difference between the MAX and MIN values of the FTP SENSOR (FINE) about 0.67 kPa (0.2 inHg, 5 mmHg) or less? 

    YES  - Troubleshooting is complete.

    NO  - Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the ECM/PCM, then go to step  1.

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