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 knockings. 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 engine knocking occurs, the sensor picks-up vibrates. When the ECM (included in the hybrid vehicle control ECU) detects the voltage in this frequency range, it retards the ignition timing to suppress the engine knocking.
The ECM (included in the hybrid vehicle 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:
- DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
- DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
- Read freeze frame data using the Techstream. The ECM (included in the hybrid vehicle control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
(a) Disconnect the Bd1 connector.
(b) Using lead wires, connect the Bd1 terminals as follows.
(c) Warm up the engine.
(d) Run the engine at 2500 rpm for 10 seconds or more.
(e) Connect the Techstream to the DLC3.
(f) Turn the power switch on (IG) and turn the Techstream on.
(g) Select the items: Powertrain / Engine and ECT / Trouble Codes.
(h) Read the DTCs.
Result:
(i) Reconnect the Bd1 connector.
B -- CHECK KNOCK CONTROL SENSOR (SENSOR RESISTANCE)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (Bd1 CONNECTOR - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the Bd1 connector.
(b) Disconnect the hybrid vehicle 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 Bd1 connector.
(e) Reconnect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EA1 CONNECTOR KNOCK CONTROL SENSOR)
OK -- Continue to next step.
3. CHECK HYBRID VEHICLE CONTROL ECU
(a) Disconnect the hybrid vehicle control ECU connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Reconnect the hybrid vehicle control ECU connector.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. CHECK KNOCK CONTROL SENSOR (SENSOR RESISTANCE)
(a) Disconnect the Bd1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reconnect the Bd1 connector.
NG -- CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - KNOCK CONTROL SENSOR)
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - KNOCK CONTROL 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 Bd1 connector.
(b) Disconnect the d1 or d2 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 Bd1 connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EA1 CONNECTOR KNOCK CONTROL SENSOR)
OK -- REPLACE KNOCK CONTROL SENSOR