DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of 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 the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.
DTC No. |
DTC Detection Condition |
Trouble Area |
P0327 P0332 |
Output voltage of knock sensor 1 or 2 is less than 0.5 V (1 trip detection logic) |
|
P0328 P0333 |
Output voltage of knock sensor 1 or 2 is more than 4.5 V (1 trip detection logic) |
|
HINT: When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During failsafe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.
Reference: Inspection using an oscilloscope
The correct waveform is as shown.
MONITOR DESCRIPTION
The knock sensor, located on the cylinder block, detects spark knock. When a 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 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.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock Sensor Range Check (High voltage) P0328 and P0333:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
1 READ VALUE OF DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
Result
2 CHECK HARNESS OR CONNECTOR (EA1 CONNECTOR - ECM)
Standard resistance: Check for open
Check for short
3 INSPECT ECM
Standard voltage
NOTICE: Fault may be intermittent. Check the wire harness and connectors carefully and retest.
CHECK FOR INTERMITTENT PROBLEMS
4 INSPECT KNOCK SENSOR
Standard resistance
5 CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - KNOCK SENSOR)
HINT:
Standard resistance: Check for open
Check for short
REPLACE KNOCK SENSOR
Reassembly
1. INSTALL NO. 2 SEAT LEG SUB-ASSEMBLY
Install the No. 2 seat leg sub-assembly with the 3
bolts and nut.
Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf)
NOTICE:
Tighten the bolts and nuts in the order shown in
the illustration.
Install the 3 clamps.
2. INSTALL NO. 2 SEAT ...
Diagnostic trouble code chart
1. DTCS FOR OCCUPANT CLASSIFICATION SYSTEM
If a trouble code is displayed during the DTC check,
check the circuit listed for the code in the table below
(proceed to the page listed for that circuit).
HINT:
When DTC B1150/23 is detected as a result of
troubleshooting for the airbag system, pe ...
Zero Point Calibration of Yaw Rate Sensor Undone
DESCRIPTION
The skid control ECU receives signals from the yaw rate sensor via CAN
communication system.
Yaw rate sensor has the built-in deceleration sensor.
If there is trouble in the bus lines between the yaw rate and deceleration
sensor and CAN communication
system, the DTC U0123 ...