Knock Sensor: Testing and Inspection

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KNOCK SENSOR

The knock sensor is a piezoelectric device attached to the cylinder block that senses pressure from engine knock conditions. This vibrational pressure is then converted into a voltage signal which is delivered as output. It engine knock occurs, ignition timing is retarded to suppress it.

Circuit Diagram (Knock Sensor):

CIRCUIT DIAGRAM

Haness Connector:

HARNESS CONNECTOR

Troubleshooting Procedures:

TROUBLESHOOTING PROCEDURES

TROUBLESHOOTING HINTS

1. The MIL is ON or the DTC is displayed on the HI-SCAN (PRO) under the following condition:
1. When the knock sensor signal is not detected, even though the engine is in an overload condition.
2. When the knock sensor signal is abnormally low.

Harness Insepction Procedures (Knock Sensor):

HARNESS INSPECTION PROCEDURES (KNOCK SENSOR)