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DTC P0451: FTP Sensor Range/Performance Problem Honda Pilot I

Auxiliary Emission Control Systems 10 illustrations ~756 words

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

Scheme 18

Scheme 18: DTC P0451: FTP Sensor Range/Performance Problem
Scheme 18: DTC P0451: FTP Sensor Range/Performance Problem

Scheme 19

Scheme 19
Scheme 19
  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. Is there about 2.5 V? YES -Go to step 4. NO -Replace the FTP sensor.
  4. Turn the ignition switch OFF.
  5. Remove the EVAP canister cover (see step 1 on «EVAP Canister Replacement»(ref-174004-S27539932452005041500000) ).
  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.
  8. Turn the ignition switch ON (II).
  9. Monitor the FTP sensor voltage with the scan tool or the HDS, or measure voltage between PCM connector terminals A29 and C18, and slowly squeeze the vacuum pump a little while watching the voltage.
  10. The voltage should smoothly drop from about 2.5 V to about 1.5 V. Stop applying vacuum when the voltage drops to about 1.5 V or damage to the FTP sensor may occur. Does the voltage drop to about 1.5 V and hold? YES -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If the symptom/indication goes away, replace the original PCM. NO -Replace the FTP sensor.

Scheme 20

Scheme 20: DTC P0452: FTP Sensor Circuit Low Voltage
Scheme 20: DTC P0452: FTP Sensor Circuit Low Voltage

Scheme 21

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Scheme 23

Scheme 23
Scheme 23
  1. Check for misrouted, poorly connected, damaged, or pinched vacuum lines at the FTP sensor. Are the vacuum lines OK? YES -Go to step 2. NO -Repair or replace vacuum lines as necessary.
  2. Reset the PCM (see «HOW TO RESET THE PCM»(ref-173995-S09390407622005041500000) ).
  3. Remove the fuel fill cap.
  4. Turn the ignition switch ON (II).
  5. Monitor the FTP sensor voltage with the scan tool or the HDS, or measure voltage between body ground and PCM connector terminal A29. Is there about 2.5 V? YES -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and at the PCM. NO -Go to step 6.
  6. Turn the ignition switch OFF.
  7. Reinstall the fuel fill cap.
  8. Disconnect the FTP sensor 3P connector.
  9. Turn the ignition switch ON (II).
  10. Measure voltage between FTP sensor 3P connector terminals No. 1 and No. 2. Is there about 5 V? YES -Go to step 11. NO -Repair open in the wire between the FTP sensor and the PCM (C28).
  11. Measure voltage between FTP sensor 3P connector terminals No. 2 and No. 3. Is there about 5 V? YES -Replace the FTP sensor. NO -Go to step 12.
  12. Turn the ignition switch OFF.
  13. Disconnect PCM connector A (32P).
  14. Check for continuity between FTP sensor 3P connector terminal No. 3 and body ground. Is there continuity? YES -Repair short in the wire between the FTP sensor and the PCM (A29). NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM.

Scheme 24

Scheme 24: DTC P0453: FTP Sensor Circuit High Voltage
Scheme 24: DTC P0453: FTP Sensor Circuit High Voltage

Scheme 25

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Scheme 27

Scheme 27
Scheme 27
  1. Check for misrouted, poorly connected, damaged, or pinched vacuum lines at the FTP sensor. Are the vacuum lines OK? YES -Go to step 2. NO -Repair or replace vacuum lines as necessary.
  2. Reset the PCM (see «HOW TO RESET THE PCM»(ref-173995-S09390407622005041500000) ).
  3. Remove the fuel fill cap.
  4. Turn the ignition switch ON (II).
  5. Monitor the FTP sensor voltage with the scan tool or the HDS, or measure voltage between body ground and PCM connector terminal A29. Is there about 2.5 V? YES -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and at the PCM. NO -Go to step 6.
  6. Turn the ignition switch OFF.
  7. Reinstall the fuel fill cap.
  8. Disconnect the FTP sensor 3P connector.
  9. Turn the ignition switch ON (II).
  10. Measure voltage between FTP sensor 3P connector terminals No. 1 and No. 2. Is there about 5 V? YES -Go to step 11. NO -Repair open in the wire between the FTP sensor and the PCM (C18).
  11. Measure voltage between FTP sensor 3P connector terminals No. 2 and No. 3. Is there about 5 V? YES -Replace the FTP sensor. NO -Go to step 12.
  12. Measure voltage between PCM connector terminals A29 and C18. Is there about 5 V? YES -Repair open in the wire between the FTP sensor and the PCM (A29). NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM.

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