Checking connectors and wiring

Check the engine speed (RPM) sensor connector. Check for contact resistance and oxidation.

Check the signal cable between the engine speed (RPM) sensor terminal #1 and engine control module (ECM) terminal #A48 (#A48). Check the signal cable between engine speed (RPM) sensor terminal #2 and engine control module (ECM) terminal #A66 (#B6). Check for a short-circuit to supply voltage. Check for an short-circuit to ground. Check for an open-circuit.

Check the carrier plate, search for damage and other defects.

Remedy as necessary.

Other information: 

• To connect the breakout box / access the control module, see Connecting the breakout box
• To access or replace the engine speed (RPM) sensor, see Engine speed (RPM) sensor, replacing
• For information about signals, see ELECTRICAL SYSTEM
• See Contents .

Fig 1: Identifying Camshaft Reset Valve Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Engine Speed Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification