(d) Reconnect the knock control sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (KNOCK CONTROL SENSOR - ECM)
OK -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
From 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0327,P0328,P0332,P0333: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DESCRIPTION
A flat type knock control sensor (non-resonant type) has a structure that can detect vibration between approximately 6 kHz and 15 kHz.
Knock control sensors are fitted onto the engine block to detect engine knocking.
The knock control sensor contains a piezoelectric element which generates a voltage when it becomes deformed.
The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the
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
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