Fail Safe
WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.
Knocking compensation
When normal: Learning ignition advance angle value = knock F/B advance angle + entire learning advance angle value + proportional learning advance angle value
Failure: learned ignition advance value = -6°CA. (6°CA retard)
Knock F/B advancing angle = 0°CA
Whole learning prohibited
proportional learning prohibited