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

Check the signal line for open circuit, short-circuit to ground and short-circuit to voltage.

Check the carrier plate.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
• For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
• see REPLACING THE ENGINE SPEED (RPM) SENSOR
• see CHECKING WIRING AND TERMINALS

Fig 2: Identifying Engine Speed (RPM) Sensor Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Engine Speed (RPM) Sensor

Courtesy of VOLVO CARS CORPORATION

Refer to VERIFICATION