P0332

3UZ-FE 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 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) can detect vibration in a wide band of frequency (6 kHz to 15 kHz).
The sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the knock sensor picks up vibrations in a specific frequency range. When the ECM detects signal voltage in this frequency range, it retards the ignition timing to suppress the knocking. The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor.

- Reference: Inspection using an oscilloscope.
The correct waveform is as shown.

MONITOR DESCRIPTION

If the output signal remains low or high for more than 10 seconds, the ECM interprets this as a fault in the knock sensor and sets a DTC.
The monitors for DTC P0327, P0328, P0332 and P0333 run after the engine is started and 5 seconds have passed.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Knock sensor range check:

TYPICAL MALFUNCTION THRESHOLDS

Knock sensor range check (low voltage):

Knock sensor range check (high voltage):

COMPONENT OPERATING RANGE

WIRING DIAGRAM

INSPECTION PROCEDURE
HINT:
- DTC P0327 and P0328 are for the bank 1 knock sensor circuit.
- DTC P0332 and P0333 are for the bank 2 knock sensor circuit.
- Read freeze frame data using the Techstream. 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.

PROCEDURE

1. READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

(a) Disconnect the EB1 connector.
(b) Using lead wires, connect the EB1 terminals as follows.

B -- INSPECT KNOCK SENSOR (RESISTANCE)
A -- Continue to next step.
2. CHECK WIRE HARNESS (EB1 FEMALE CONNECTOR - ECM)

(a) Disconnect the EB1 connector.
(b) Disconnect the E3 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK ECM (KNK1, KNK2 VOLTAGE)

(a) Turn the ignition switch ON.
(b) Measure the voltage of the ECM connector.
Standard voltage:

NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT KNOCK SENSOR (RESISTANCE)

(a) Disconnect the EB1 connector.
(b) Measure the resistance of the EB1 female connector.
Standard resistance:

OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
5. CHECK WIRE HARNESS (EC2 MALE CONNECTOR - KNOCK SENSOR)

(a) Disconnect the EB1 connector.
(b) Disconnect the K1 and K2 knock sensor connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

HINT:
- If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the bank 1 side.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the bank 2 side.

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE KNOCK SENSOR