| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
Knock sensor is located on right side of cylinder block. Sensor generates voltage when engine block vibrates due to knocking. DTC is set when there is no knock sensor signal to ECM with engine speed of 1200 RPM or more. Possible causes are
- Open or short in knock sensor circuit.
- Knock sensor (loose).
- ECM.