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: Identifying Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Front heated oxygen sensor (HO2S) connector disconnected
Ignition on.
Connect a voltmeter between connector terminal #4 on the heated oxygen sensor (HO2S) (control module side) and ground.

Fig 3: Identifying Heated Oxygen Sensor 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 approximately 0.5 V.

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

Check the cable between heated oxygen sensor (HO2S) connector terminal #4 and engine control module (ECM) connector terminal #45. Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Fig 1: Identifying Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

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Fig 3: EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

Continue
Refer to Verification