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OBD I Trouble Codes

Decoding your VIN
OBD I Fault Code Detail
Code 43
Electronic Spark Control (ESC) Circuit
The knock sensor is used to detect engine detonation and the ECM will retard the electronic spark timing based on the signal being recieved.  The circuitry within the knock sensor causes the ECM's supplied 5 volt signal to be pulled down, so that under a no knock condition the knock sensor circuit would measure about 2.5 volts.  The knock sensor produces an A/C signal which rides on the 2.5 volts DC voltage.  The amplitude and signal frequency is dependent upon the knock level.

If the knock sensor circuit becomes open or shorted to ground, the voltage will either go above 3.5 volts or below 1.5 volts.  If either of these conditions are met for 20 seconds, a Code 43 will be stored.

Code 43 will set if:
-  Voltage on knock sensor circuit goes above 3.5 volts or below 1.5 volts
-  Condition present for 20 seconds
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