Checking the ground lead

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Connect a voltmeter between mass air flow (MAF) sensor connector terminal #1 (engine control module (ECM) side) and ground.

Fig 1: Identifying Atmospheric Pressure Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 Ω.

OK
Refer to Defective mass air flow (MAF) sensor
NOT OK
Refer to Checking wiring and terminals