DTC 31

CIRCUIT DIAGRAM





USING OSCILLOSCOPE

Steps 1-2:

HARNESS INSPECTION


OPERATION

The detonation sensor is provided in a position allowing accurate detection of knocking generated in each cylinder. The cylinder block vibration generated by knocking is detected. Proportionally to its magnitude, the Voltage is output. Since the block frequency generated by knocking is known on each engine, ECU only detects knocking through the frequency filter to control the retard angle of the ignition timing according to the strength of the knocking.

TROUBLESHOOTING HINTS

If the detonation sensor is troubled, a slight reduction of power will be felt since the ignition timing angle is forcibly retarded.