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Home >> Volvo >> 2013 >> XC90 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 4 Of 13 >> ECM-303C: Front Knock Sensor (KS). Signal Too High (B5254T2; 2005-2007) >> Signal Too High. Permanent Fault >> Checking Components And Wiring

Checking Components And Wiring

Check the signal cable between knock sensor (KS) terminal #1 and control module terminal #A46 (#A46). Check the ground lead between knock sensor (KS) terminal #2 and control module terminal #A64 (#B4). 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 CORPORATION
Fig 2: Identifying Ohm Meter
GLL101042Courtesy of VOLVO CARS CORPORATION
Fig 3: Identifying Knock Sensor
GLL103035Courtesy of VOLVO CARS CORPORATION