P0327
2AR-FXE ENGINE CONTROL: SFI SYSTEM: P0327, P0328: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DESCRIPTION
A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 kHz.
The knock control sensor is fitted onto the engine block to detect engine knocking.
The knock control 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 DTC P0327 or P0328 is stored, 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 power switch is turned off.
Reference: Inspection using an oscilloscope
HINT
The correct waveform is as shown.
MONITOR DESCRIPTION
If the output voltage transmitted by the knock control sensor remains low or high for 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.
The monitor for DTCs P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0327
P0328
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the power switch off and wait for at least 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode) Component Tests and General Diagnostics.
7. Start the engine and wait 5 minutes.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0327 or P0328.
12. 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 N/A, idle the engine for 5 minutes and check the DTC judgment result again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
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
Read freeze frame data using the Techstream. The ECM 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 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 VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode (maintenance mode) Component Tests and General Diagnostics.
(e) Start the engine.
(f) Warm up the engine.
(g) Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Knock Feedback Value.
(h) Read the value while driving the vehicle.
OK:
The value changes.
HINT
The Knock Feedback Value change can be confirmed by running the engine with a high load, for example, by racing the engine.
NG -- CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)
(a) Disconnect the knock control sensor connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
OK -- Continue to next step.
3. INSPECT KNOCK CONTROL SENSOR
(a) Inspect the knock control sensor Testing and Inspection.
HINT
Perform "Inspection After Repair" after replacing the knock control sensor Programming and Relearning.
NG -- REPLACE KNOCK CONTROL SENSOR Removal
OK -- REPLACE ECM Removal
4. CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
(a) Disconnect the knock control sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal