P0327
1GR-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 a structure that can detect vibrations over a wide band of frequencies: 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 any of DTCs P0327, P0328, P0332 and P0333 are 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 ignition switch is turned OFF.
- Reference: Inspection using an oscilloscope
The correct waveform is as shown.
MONITOR DESCRIPTION
If the output voltage transmitted by the knock sensor remains low or high for more than 1 second, the ECM interprets this as a malfunction in the sensor circuit, and sets a DTC.
The monitor for DTCs P0327, P0328, P0332 and P0333 begins to run when 5 seconds have elapsed since the engine was started.
If the malfunction is not repaired successfully, any of DTC P0327, P0328, P0332 or P0333 is set 5 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock Sensor Range Check (High voltage) P0328 and 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 a Techstream. Freeze frame data record 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. READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
(a) Disconnect the BU1 connector.
(b) Using lead wires, connect the connectors as follows.
(c) Warm up the engine.
(d) Run the engine at 3,000 rpm for 10 seconds or more.
(e) Connect a Techstream to the DLC3.
(f) Turn the ignition switch ON and turn the tester ON.
(g) Select the item: Powertrain / Engine and ECT / Trouble Codes.
(h) Read DTCs.
Result:
(i) Reconnect the BU1 connector.
B -- INSPECT KNOCK SENSOR
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)
(a) Disconnect the BU1 connector.
(b) Disconnect the B2 ECM 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 BU1 connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM
(a) Disconnect the B2 ECM connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(d) Reconnect the ECM connector.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT KNOCK SENSOR
(a) Disconnect the BU1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the BU1 connector.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (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 BU1 connector.
(b) Disconnect the U1 and U2 knock sensor connectors.
(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 BU1 connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR