Checking for contact resistance and oxidation. Intermittent fault

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.

Ignition off.
The fault can be caused by temporary interference in the communication between engine control module (ECM) and immobilizer control module.

Check ground connections for contact resistance and oxidation according to Contact resistance and oxidation .

Fig 2: Identifying Ohms Display
Courtesy of VOLVO CARS OF NORTH AMERICA.