Checking connectors and wiring

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

Check the signal cable between:

• engine speed (RPM) sensor terminal #1 and engine control module (ECM) terminal #A48 (#A48)
• engine speed (RPM) sensor terminal #2 and engine control module (ECM) terminal #A66 (#B6).

Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

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 2: Identifying Engine Speed (RPM) Sensor terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Engine Speed (RPM) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification