LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2013 >> XC90 R-Design, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 4 Of 13 >> ECM-303D: Front Knock Sensor (KS). Signal Too Low (B5254T2; 2005-2007) >> Signal Too Low. Permanent Fault >> Checking Wiring And Connectors
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Checking Wiring And Connectors

Check the knock sensor (KS) connector. Check for contact resistance and oxidation.

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

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

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