Vauxhall Workshop Service and Repair Manuals

Trouble Code

Information Sensor Cause of Fault

Remedy in F0:DATA LIST No.

Trouble Code Storage when ...

18

KNOCK FILTER MODULE

16

·   The control unit recognises a constant voltage condition from the knock module (cannot occur under normal operating conditions)

·   Above condition must be fulfilled for at least 4 s

Replacement value:

·   RON 91 octane characteristic curve

Effects:

·   Knock control is switched off

or

·   The control unit tests the knock module under certain operating conditions:

     The firing angles of cylinders 2 and 3 are advanced twenty times by 0.7 °CA each time. The knock module must recognise knock at least once.

·   Following trouble codes not stored: 14, 15, 33, 34

·   RON 91 octane characteristic curve not activated

·   Engine speed lower than 5000 rpm

·   Coolant temperature higher than 85 °C/ 185 °F but lower than 104 °C/ 219 °F

·   Contents of long term correction for active knock cell is 0 °CA

·   Intake manifold absolute pressure lower than 9.8 kPa (98 mbar)

·   Above conditions must be fulfilled for at least 15 s

Replacement value:

·   RON 91 octane characteristic curve

Effects:

·   Knock control is switched off

Note:

If trouble code 18 was recognised, carry out following instructions:

·   Disconnect battery;

·   Connect battery again;

·   Delete trouble code and read out trouble codes again;

·   If trouble code 18 occurs: check that knock module is correctly seated in socket, if necessary replace knock module;

·   Delete trouble code again and read out trouble codes;

·   If trouble code 18 occurs again: replace control unit;