Checking the knock sensor (KS) signal

Fig 1: Engine Start Verification

GLL101037

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Connecting Connector

GLL101069

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Reinstall the components, reconnect the connectors etc.
Start the engine and run it to normal operating temperature
Rev the engine to 3500 RPM. Read off the value of the knock sensor (KS) signal.
The value must be between 2 and 6.

If the value is now OK it means that the cause of the fault was loose connections in connector.

Other information
- To access or replace the knock sensor (KS):
  - For B5xx4T, see Replacing knock sensors (KS)
  - For B6xx4x, see Knock sensor (KS), replacing .
- For information about signals on 5 cylinder engines, see Signal specification
- For information about signals on 6 cylinder engines:
  - For 6 cylinder engines -2001, see Signal specification
  - For 6 cylinder engines 2002-, see Signal specification
  - For 6 cylinder engines -2004, see Signal specification
  - For 6 cylinder engines 2005-, see Signal specification .
Fig 3: Identifying Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 5: Identifying Knock Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the value between 2 and 6?

OK
OKAY: Troubleshooting has been completed.
NOT OK
Refer to Replacing the component