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Equipment Settings
Conditions
MONITOR DESCRIPTION
The knock 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 spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for
faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock
sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor
and sets a DTC.
Required Sensors/Components (Main)
Duration
Time after engine start
Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock sensor voltage
Knock Sensor Range Check (High voltage) P0328 and P0333:
Knock sensor voltage
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Content
0.01 to 10 V/DIV.
0.01 to 10 ms./DIV.
Keep engine speed at 4,000 rpm with
warm engine
P0327: Knock sensor (Bank 1) open/short (Low voltage)
P0328: Knock sensor (Bank 1) open/short (High voltage)
P0332: Knock sensor (Bank 2) open/short (Low voltage)
P0333: Knock sensor (Bank 2) open/short (High voltage)
Knock sensor (Bank 1 and 2)
-
Immediate
None
None
10.5 V or more
ON
Less than 0.5 V
More than 4.5 V
ES–225
ES
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