P1455
DTC P1455 Vapor Reducing Fuel Tank System MalfunctionDESCRIPTION
DTC Detection Condition:
Using the heated oxygen sensor and pressure switching VSV, the ECM detects fuel leaks from inside of a bladder tank in the fuel tank.
Based on signals from the heated oxygen sensor while the VSV for purge flow switching valve is ON, the ECM judges if fuel is leaked from the bladder tank or not.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
The ECM detects leakage of evaporative emissions from the bladder membrane by using the heated oxygen sensor and pressure switching valve. By opening the purge VSV and then closing the pressure switching valve, air in the outer tank is drawn into the intake manifold.
The ECM checks concentration of hydrocarbon (HC) molecules in the air drawn from the bladder membrane area. Also, the ECM checks the sensor output before and after closing the pressure switching valve. If there is change in the HC concentration when the pressure switching valve is opened or closed,the ECM will conclude that the bladder membrane is leaking. The ECM will illuminate the MIL and set a DTC.
MONITOR RESULT
Refer to detailed information. Checking Monitor Status
INSPECTION PROCEDURE
HINT: Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
