ignition timing.
HINT
When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition
timing is delayed to its maximum retardation. Fail-safe mode continues until the engine switch is turned off.
Reference: Inspection using an oscilloscope
The correct waveform is as shown in the illustration.
MONITOR DESCRIPTION
The knock control sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor
vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock control sensor and uses this noise to check for faults in the sensor. If the knock
control sensor signal level is too low for more than 10 seconds, or if the knock control sensor output voltage is outside the normal range, the ECM
interprets this as a fault in the knock control sensor and sets a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low Voltage): P0327 and P0332
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