Fuel tank pressure sensor (certain markets only)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Fuel Tank Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The fuel tank pressure sensor detects the pressure in the fuel tank. The signal from the sensor is used by the engine control module (ECM) during diagnostics to check for leakage in the fuel tank system.

The sensor, which is a piezo resistor, is grounded in the control module and supplied with power from the control module.

The resistance in the sensor changes depending on the pressure in the fuel tank, giving a signal of 0.5 - 4.5 V. Low pressure results in low voltage, high pressure in high voltage.

The tank pressure sensor can be diagnosed by the Engine control module (ECM), and the sensor's signal can be read using VIDA.

The fuel tank pressure sensor is positioned on top of the fuel tank on cars with leakage diagnostics for the evaporative emission (EVAP) system.