DTC 52

CODE 52 - KNOCK SENSOR CIRCUIT

Circuit Description

Knock sensor is fitted the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.




Detecting Condition

If the ECM detects the above diagnosis conditions, it operates the fail safe function in which the corrective retard angle value is set to the maximum value.




Trouble Code Detection Driving Pattern

Purpose of the driving pattern

(a) To simulate diagnostic trouble code detecting condition after diagnostic; trouble code is recorded.
(b) To check that the malfunction is corrected when the repair is completed confirming that diagnostic trouble code is no longer detected.




Diagnostic Chart




Wiring Diagram

Step 1:

Step 2:

Step 3:

Step 4:

Inspection Procedure




Inspection Using an Oscilloscope