2NZ-FE ENGINE CONTROL SFI SYSTEM P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
DESCRIPTION
A flat type knock control sensor (non-resonant type) has a structure that can detect vibration 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. The occurrence of engine knocking can be suppressed by delaying the ignition timing.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0327 | Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) | Output voltage of knock control sensor is less than 0.5 V for 1 second or more (1 trip detection logic). | ·
Short in knock control sensor circuit ·
Knock control sensor ·
ECM |
Comes on | DTC stored |
| P0328 | Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) | Output voltage of knock control sensor is higher than 4.5 V for 1 second or more (1 trip detection logic). | ·
Open in knock control sensor circuit ·
Knock control sensor ·
ECM |
Comes on | DTC stored |
- 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 ignition switch is turned off.
Reference: Inspection using an oscilloscope
- HINT:
-
The correct waveform is as shown.
| ECM Terminal Name | Between KNK1 and EKNK |
| Tester Range | 1 V/DIV., 1 ms./DIV. |
| Condition | Engine speed maintained at 4000 rpm after warming up engine |
MONITOR DESCRIPTION
If the output voltage transmitted by the knock control sensor remains low or for high 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
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and wait 5 minutes.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
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.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0327 or P0328.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
| N/A | ·
Unable to perform DTC judgment ·
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit |
- 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.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- HINT:
-
Read freeze frame data using the GTS. 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
Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Knock Feedback Value.
- Powertrain > Engine and ECT > Data List
-
Tester Display Knock Feedback Value - 50003 234 192
Read the value while driving the vehicle.
- OK:
The value changes.
- HINT:
Malfunction does not occur Knock Feedback Value changes Malfunctions occur Knock Feedback Value does not change
-
The Knock Feedback Value change can be confirmed by running the engine with a high load, for example, by activating the air conditioning system and racing the engine.
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Knock Control Sensor) |
Disconnect the knock control sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition R1-2 - R1-1 Ignition switch ON 4.5 to 5.5 V
- Result:
Proceed to OK NG
OK
NG
Inspect the knock control sensor.
Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>KNOCK SENSOR>INSPECTION
- Result:
Proceed to OK NG
OK
NG
Disconnect the knock control sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition R1-2 - B56-110 (KNK1) Always Below 1 Ω R1-1 - B56-111 (EKNK) Always Below 1 Ω R1-2 or B56-110 (KNK1) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG