Checking the Pressure Switch (Pressostat)

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Disconnect the pressure switch (Pressostat) connector.
Connect an ohmmeter to both pressure switch (Pressostat) terminals.

Fig 3: Identifying Canister Purge Valve Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 ohm.

OK
FAULT NOT FOUND: Troubleshooting has been completed.
NOT OK
Refer to Checking Pressure On Low Pressure Side

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Disconnect the pressure switch (Pressostat) connector.
Connect an ohmmeter to both pressure switch (Pressostat) terminals.

Fig 3: Identifying Canister Purge Valve Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 ohm.

OK
FAULT NOT FOUND: Troubleshooting has been completed.
NOT OK
Refer to Checking Pressure On Low Pressure Side .