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Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 5 Of 11 >> ECM-304C: Rear Knock Sensor (KS). Signal Too High (B5254T2; B6294S2; B6294T; 2005-2006) >> Signal too high. Permanent fault >> Checking components and wiring >> Notes

Checking components and wiring: Notes

Check the signal cable between knock sensor (KS) terminal #3 and control module terminal #A45 (#A45). Check the ground lead between knock sensor (KS) terminal #4 and control module #A67 (#B7). Check for a short-circuit to supply voltage.

Check that the knock sensor (KS) is tightened to the correct torque.

HINT: The diagnostic trouble code (DTC) may be caused by a worn engine. Start the engine and listen for noise. 

Remedy as necessary.

Other information 

Fig 1: Identifying Connector Terminals
GLL104077Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying Knock Sensor
GLL103035Courtesy of VOLVO CARS OF NORTH AMERICA.