General Information

Engine Control
P0451 Evaporative Emission System-Pressure Sensor Range / Performance - General Information

Component Location





General Description

The evaporative emission control system prevents hydrocarbon vapors from escaping from the fuel system into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Fuel Tank Pressure Sensor (FTPS) is an integral part of the evaporative system testing. The PCM monitors the FTPS signal while checking the system for vacuum decay, valve leakage and restrictions. monitoring pressure and vacuum levels in the fuel tank during the purge control solenoid valve operating cycles.

DTC Description

Checking output signals of tank pressure under detecting condition, if the tank pressure does not change less than 0.2(0.05V) within 3min., PCM sets P0451. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig.1) Normal data & waveform of FTPS at idle.
Fig.2) Abnormal data & waveform of FTPS when FTPS connector disconnected.