P0328

3MZ-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) has the structure that can detect the vibration in a wider band of frequency from about 6 kHz to 15 kHz and has the following features.
Knock sensors are fitted on the right bank and left bank of the cylinder block to detect engine knocking. Each knock sensor contains a piezoelectric element which generates voltage when it becomes deformed. Generation of the voltage occurs when the cylinder block vibrates due to a knocking. If an engine knocking occurs, the ignition timing is retarded in order to suppress the knocking.





- Reference: Inspection using the oscilloscope.









The correct waveform is as shown.

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects an engine knocking. When an engine knocking occurs, the sensor picks-up vibrates. When the ECM (Included in HV control ECU) detects the voltage in this frequency range, it retards the ignition timing to suppress the engine knocking.
The ECM (Included in HV control ECU) 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, and if the knock sensor output voltage is out of 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

P0327, P0332





P0328, P0333





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 Techstream. The ECM (Included in HV control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 EA1 connector.
(b) Using lead wires, connect the EA1 terminals as follows.





(c) Warm up the engine.
(d) Run the engine at 3,000 rpm for 10 seconds or more.
(e) Connect Techstream to the DLC3.
(f) Turn the ignition switch to the ON position and turn the tester on.
(g) Select the items: Powertrain / Engine and ECT / Trouble Code.
(h) Read the DTCs.
Result:





(i) Reconnect the EA1 connector.
B -- CHECK KNOCK CONTROL SENSOR (SENSOR RESISTANCE)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR





(a) Disconnect the EA1 connector.





(b) Disconnect the H33 HV control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the EA1 connector.
(e) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HV CONTROL ECU





(a) Disconnect the H33 HV control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage between the specified HV control ECU terminals
Standard voltage:





(d) Reconnect the HV control ECU connector.
NG -- REPLACE HV CONTROL ECU
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. CHECK KNOCK CONTROL SENSOR (SENSOR RESISTANCE)





(a) Disconnect the EA1 connector.
(b) Measure the resistance between the terminals of the EA1 male connector.
Standard resistance:





(c) Reconnect the EA1 connector.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - KNOCK SENSOR)
HINT:
- If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.





(a) Disconnect the EA1 connector.





(b) Disconnect the K2 or K3 knock sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the EA1 connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR