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 system to purge. FLI indicates fuel level in tank with a hard wire signal input to PCM from fuel pump module.