DTC P0451 '01 Model: FTP Sensor Range/ Performance Problem Honda Odyssey II

Special Tools Required

1. Vacuum pump/gauge, 0-30 in.Hg A973X-041-XXXXX

Scheme 68

Scheme 69

Scheme 70

1. Remove the fuel fill cap.
2. Turn the ignition switch ON (II).
3. Monitor the FTP sensor voltage with the HDS, or measure voltage between PCM connector terminals E7 and E28. Is there about 2.5 V? YES: Go to step 4. NO: Replace the FTP sensor.
4. Turn the ignition switch OFF. 5.
5. Disconnect the hose between the EVAP two way valve and the FTP sensor at the EVAP two way valve end.
6. Connect a vacuum pump to the open end of the hose.
7. Turn the ignition switch ON (II).
8. Monitor the FTP sensor voltage with the HDS, or measure voltage between PCM connector terminals E7 and E28, and slowly squeeze the vacuum pump one stroke at a time.
9. The voltage should drop smoothly drop from about 2.5 V down 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: Check for misrouted, leaking, or broken FTP sensor vacuum lines. If the vacuum lines are OK, substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the symptom/indication goes away, replace the original PCM. NO: Replace the FTP sensor.