Checking wiring and connectors

Check the cable between front heated oxygen sensor (HO2S) terminal #1 and the system relay. Check for an intermittent open-circuit.

Check the cable between control module terminal #A18 and front heated oxygen sensor (HO2S) terminal #2. Check for an intermittent open-circuit.

Other information 

• See Checking wiring and terminals. Intermittent faults
• See connecting the breakout box
• See Replacing the engine control module (ECM)
• See Heated oxygen sensor (HO2S), replacing
• See Signal specification

Fig 1: Identifying 4-Bit connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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