Skyhawk L4-112 1.8L Turbo VIN J FI (1984)
2.
Checks to see if ESC can detect a knock and retard the timing without road testing.
3.
By disconnecting the ESC module, the ECM see slow voltage at Terminal "B7 " and should retard timing. After approximately 4 seconds,
"SERVICE ENGINE SOON" light will come "ON" and Code 43 will be stored.
4.
Checks for proper voltage output (measured on A.C. scale) of knock sensor. Low or no voltage would indicate an open circuit to Terminal "E" or
faulty sensor.
5.
Checks to see if constant retard is due to a faulty knock sensor or module, or if a false voltage signal is being transmitted on the wire from the
knock sensor by induction from an adjacent wire, such as a spark plug wire, ignition wire, etc. Reroute wires as necessary.
