Checking wiring and connectors

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 OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Check the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation according to Contact resistance and oxidation .

Check the cable between control module terminal #65 and heated oxygen sensor (HO2S) connector terminal #2. Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check the cable between fuse 18 in the integrated relay / fusebox in the engine compartment and heated oxygen sensor (HO2S) terminal #1. Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Try a new rear heated oxygen sensor (HO2S) if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information
- To connect the breakout box and access the control module, see Connecting the breakout box. EMS 2000
- To access or replace the rear heated oxygen sensor (HO2S), see Replacing lambda sond rear
- For information about signals see Signal specification .
Fig 2: Identifying Terminals 1 And 4
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

Fig 4: Identifying EMS2000
Courtesy of VOLVO CARS OF NORTH AMERICA.

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