Troubleshooting

DTC P0330 KNOCK SENSOR 2 CIRCUIT (BANK 2)

*: Only for 3MZ-FE

CIRCUIT DESCRIPTION

DTC Detection Condition:

Knock sensors are fitted on the right bank and left bank of the cylinder block to detect engine knocking. The sensor contains a piezoelectric element that becomes deformed by the cylinder block when the cylinder block vibrates as a result of engine knocking. The piezoelectric element generates voltage as a result of the cylinder block contact. If engine knocking occurs, the ignition timing is retarded to suppress it.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The knock sensor located on the cylinder block detects spark knock. When a spark knock occurs, the sensor picks up vibrations in a specific frequency range. When the ECM detects the 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 remains low for more than 10 seconds the output voltage is out of the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

Wiring Diagram:

Step 1:

Step 2:

Step 3:

INSPECTION PROCEDURE

HINT:
- DTC P0325 is for the bank 1 knock sensor circuit.
- DTC P0330 is for the bank 2 knock sensor circuit.
- Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.