Fuel Tank Pressure Sensor: Testing and Inspection

FUEL TANK PRESSURE SENSOR (FTPS)

INSPECTION

FUNCTION AND OPERATION PRINCIPLE






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 installed on the canister and is an integral part of the evaporative monitoring system. The PCM 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.

SPECIFICATION

Specification:

SCHEMATIC DIAGRAM

Schematic Diagram:

COMPONENT INSPECTION
1. Connect a scantool on Diagnosis Link Connector (DLC).
2. Check FTPS output voltage at idle.