Checking the power 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.

Ignition off
Disconnect the connectors for the front (ECM-18) and rear (ECM-1C) heated oxygen sensor (HO2S)
Ignition on.
Connect a voltmeter between connector terminal 2 on the heated oxygen sensor (HO2S) (engine control module (ECM) side) and ground.

Fig 3: Identifying Heated Oxygen Sensor (HO2S) Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

The voltmeter should read 3- 5 V.

OK
Refer to Defective heated oxygen sensor (HO2S)
NOT OK
Refer to Checking the signal cable