P0327

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

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 P032C - Knock Sensor 3 Circuit Low

DTC P032D - Knock Sensor 3 Circuit High

DTC P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)

DTC P0333 - Knock Sensor 2 Circuit High Input (Bank 2)

DTC P033C - Knock Sensor 4 Circuit Low Input

DTC P033D - Knock Sensor 4 Circuit High Input

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations 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.





HINT: When DTC P0327, P0328, P0332, P0333, P032C, P032D, P033C or P033D is 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.






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 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, P0332, P032C and P033C:





Knock Sensor Range Check (High voltage): P0328, P0333, P032D and P033D:





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- DTCs P0327 and P0328 are for the bank 1 sensor 1 knock sensor circuit.
- DTCs P032C and P032D are for the bank 1 sensor 2 knock sensor circuit.
- DTCs P0332 and P0333 are for the bank 2 sensor 1 knock sensor circuit.
- DTCs P033C and P033D are for the bank 2 sensor 2 knock sensor circuit.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. INSPECT KNOCK SENSOR




(a) Disconnect the E3 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






OK -- INSPECT ECM
NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM)




(a) Disconnect the H14, H10, H12 or H7 knock sensor connector.
(b) Disconnect the E3 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for open):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR
3. INSPECT ECM




(a) Turn the engine switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS