Porsche 944 - Manual (Page 30)

03
Maintenance, Self-diagnosis 944
The tester is now active. If knocking occurs,
this will be indicated by the tester, e.g.:
Display:
After the expiry of 10000 ignitions. the
function
display will change to "r".
Display:
Counting is now complete.
The number af knocks is displayed in per
mill.
In this example. 25 knocks have occurred.
Knock detection must be carried out until the
function display switches over from the clear
symbol to the knock detection symbol. This is
always the case once 10000 ignitions have
occurred. All occurring knocks are added up
and displayed as the end result.
To restart knack detection. the green key
must be pressed until the clear symbol again
appears.
A knock display of > 2.5 (25) draws attention
to an error.
Error possibilities:
Defective cup tappets
Conical rod damage
Crank mechanism damage
To terminale knock detection mode. the
green and yellow keys must be pressed
simultaneously until the display appears.
Display:
03 - 18 Knock detection
Printed in Germany - XVI, 1987