DTC 52 - No. 1 Knock Sensor Signal
DTC 52 is caused by a loss of No. 1 (front) knock sensor signal to ECM for 6 crank revolutions with engine speed at 1600-2000 RPM. Check for open short in No. 1 knock sensor circuit, a loose knock sensor or faulty ECM.
NOTE:
Diagnostic chart is not available from manufacturer.