Checking the signal cable

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.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Disconnect the ignition coil connector.
Ignition on.
Connect a voltmeter between the ignition coil connector terminal 2 (engine control module (ECM) side) and ground.

Fig 3: Identifying Outside Temperature Sensor Connector Terminal 2
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

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

OK
Refer to Checking ignition coil
NOT OK
Refer to Checking ignition coil