Riviera V6-231 3.8L Turbo VIN 9 FI (1984)
Knock Sensor: Testing and Inspection
Fig. 012 - WIRING DIAGRAM for Chart C-5 Electronic Spark Control Systems Check. VIN 3, VIN 9
CHART C-5, ELECTRONIC SPARK CONTROL
Electronic spark control is accomplished with a module that sends a voltage signal to the ECM. As the knock sensor detects engine knock, the voltage
from the ESC module to the ECM is shut off and this signals the ECM to retard timing.
