Toyota 2GR-FE Manual page 380

ES–224
DTC
DTC
DTC
DTC
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of
ES
frequencies: between approximately 6 kHz and 15 kHz.
Knock sensors are fitted onto the engine block to detect engine knocking.
The knock 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.
DTC No.
P0327
P0332
P0328
P0333
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.
Item
Terminals
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Knock Sensor 1 Circuit Low Input (Bank 1 or
P0327
Single Sensor)
Knock Sensor 1 Circuit High Input (Bank 1 or
P0328
Single Sensor)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)
DTC Detection Condition
Output voltage of knock sensor 1 or 2 is 0.5 V or less
(1 trip detection logic)
Output voltage of knock sensor 1 or 2 is 4.5 V or more
(1 trip detection logic)
KNK1 Signal Waveform
1 ms./Division
Content
KNK1 - EKNK
KNK2 -EKN2
• Short in knock sensor 1 or 2 circuit
• Knock sensor 1 or 2
• ECM
• Open in knock sensor 1 or 2 circuit
• Knock sensor 1 or 2
• ECM
1 V/DIV.
GND
A140638E01
or
Trouble Area