Checking the pressure switch (Pressostat) resistance

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 Switch OFF Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Pressure switch (Pressostat) disconnected.

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.
- Connect an ohmmeter across both pressure switch (Pressostat) terminals.

The ohmmeter should read approximately 0 Ω.

OK
Refer to Checking for an open-circuit
NOT OK
Refer to Fault-tracing information