Jetta L4-1781cc 1.8L SOHC (RV, PF) (1989)
Knock Sensor Location
KNOCK CONTROL
The Digifant II control unit actively controls knock "ping" allowing calibration of the ignition timing for normal operating conditions, while eliminating
the danger of knock or detonation due to influences by engine heat, load, fuel quality or engine deposits.
Knock Sensor Regulation
When the Digifant II control unit recognizes a knock condition, the ignition point for that individual cylinder will be retarded 3.0°. If the knocking stops,
the timing will be advanced in increments of .33° back to programmed values.
If knocking continues, the ignition point can be retarded up to 15° for an individual cylinder, however, it is limited to a maximum of 9° difference
between cylinders.
Idle Stabilization Operation
IDLE STABILIZATION CONTROL
Idle speed is electronically controlled by the Digifant II control unit with relation to engine coolant temperature and engine load signals.