Checking the power supply

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.

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on.
Connect a voltmeter between the idle air control (IAC) valve connector terminal 1 (control module side) and ground.

Fig 2: Identifying Idle Air Control (IAC) Valve Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Voltage Display
Courtesy of VOLVO CARS OF NORTH AMERICA.

The voltmeter should read battery voltage for 2 seconds immediately after the ignition is switched on.

OK
Refer to Checking the signal cable
NOT OK
Refer to Checking the signal cable