Detection Condition

• DTC P0451 indicates fuel tank pressure changes more than 14 in. H2O in 0.10 seconds (sensor circuit noisy).
• DTC P0461 indicates Fuel Level Input (FLI) noisy.

Fuel Tank Pressure (FTP) sensor measures fuel tank pressure during EVAP monitor test and to control excessive fuel tank pressure by forcing a system purge. FLI indicates fuel level in tank with a hard wire signal input to PCM from fuel pump module.