P0327
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327,P0328,P0332,P0333: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 5 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.
- 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 1 second, the ECM interprets this as a malfunction in the sensor circuit, and sets a DTC.
The monitor for DTCs P0327 and P0328 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
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on.
6. Start the engine and wait 10 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the DTCs.
HINT
* If a DTC is output, the system is malfunctioning.
* If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0327, P0328, P0332, P0333.
11. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 5 minutes and check the DTC judgment result again.
12. If no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
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. 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 EE1 connector.
(b) Using lead wires, connect the connectors as follows.
(c) Warm up the engine.
(d) Run the engine at 3000 rpm for 10 seconds or more.
(e) Connect the Techstream to the DLC3.
(f) Turn the ignition switch to ON and turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(h) Read DTCs.
Result
(i) Reconnect the knock sensor connector.
B -- INSPECT KNOCK SENSOR
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)
(a) Disconnect the EE1 connector.
(b) Disconnect the 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 EE1 connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM
(a) Disconnect the ECM connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(d) Reconnect the ECM connector.
NG -- REPLACE ECM Removal
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
4. INSPECT KNOCK SENSOR
(a) Disconnect the EE1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the EE1 connector.
NG -- CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
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 EE1 connector.
(b) Disconnect the 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 EE1 connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR