Enhanced Testing

P0454 - Evaporative Emission System: Pressure Sensor Intermittent







Function
The evaporative emission control system prevents hydrocarbon vapors from escaping from the fuel tank 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 monitoring system. The ECM monitors the FTPS signal to detect vacuum decay and excess vacuum. The FTPS measures the difference between the air pressure inside the fuel tank and outside air pressure to check the purge control solenoid valve operation and for leak detection in the evaporative emission control system by monitoring pressure and vacuum levels in the fuel tank during the purge control solenoid valve operating cycles.

DTC Description
The ECM monitors pressure stability in the fuel tank by means of Fuel Tank Pressure Sensor (FTPS) for a predetermined duration just before leakage monitoring begins to detect FTPS signal noise. The ECM sets DTC P0454 if the pressure fluctuation is higher than the predetermined threshold. If the fault is detected within two consecutive test cycles, the ECM illuminates the MIL.

Detecting Condition





Specifications








Wiring Schematic