READ DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)
CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK 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
Flat-type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 5 kHz and 15 kHz.A knock sensor is 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.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0327 P0332 | The output voltage of the knock sensor is below 0.5 V (1 trip detection logic). |
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| P0328 P0333 | The output voltage of the knock sensor is higher than 4.5 V (1 trip detection logic). |
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- HINT:
- When DTC P0327, P0328, P0332 or P0333 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. The ECM continues fail-safe mode until the engine switch is turned off.
The correct waveform is as shown.
| Item | Content |
| Terminal | KNK1 - EKNK KNK2 - EKN2 |
| Equipment Setting | 1 V/DIV. 1 msec./DIV. |
| Condition | Engine speed maintained at 4000 rpm with warm engine |
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 stores 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, DTC P0327, P0328, P0332 or P0333 is stored 5 seconds after the engine is next started.
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 GTS. Freeze frame data records 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.
| 1.READ DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT) |
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Disconnect the Ch1 connector.
Using lead wires, connect the connectors as follows:
| Male Connector - Female Connector |
| Terminal 2 - Terminal 4 |
| Terminal 5 - Terminal 6 |
| Terminal 4 - Terminal 2 |
| Terminal 6 - Terminal 5 |
Warm up the engine.
Run the engine at 3000 rpm for 10 seconds or more.
Connect the GTS to the DLC3.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result Result Proceed to DTC is same as when vehicle was brought in
(for example, P0327 and P0328 are output again, or P0332 and P0333 are output again)A DTC is different from when vehicle was brought in
(for example, P0327 and P0328 are output at first, but then P0332 and P0333 are output, or vice versa)B Text in Illustration *1 Knock Sensor *2 ECM *a Front view of wire harness connector
(to Knock Sensor Wire)*b Front view of wire harness connector
(to ECM Wire)
Reconnect the Ch1 connector.
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| A | |
| 2.CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM) |
Disconnect the Ch1 connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition Ch1 female connector 2 - C35-11 (KNK1) Always Below 1 Ω Ch1 female connector 5 - C35-12 (EKNK) Always Below 1 Ω Ch1 female connector 4 - C35-5 (KNK2) Always Below 1 Ω Ch1 female connector 6 - C35-6 (EKN2) Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition Ch1 female connector 2 or C35-11 (KNK1) - Body ground Always 10 kΩ or higher Ch1 female connector 5 or C35-12 (EKNK) - Body ground Always 10 kΩ or higher Ch1 female connector 4 or C35-5 (KNK2) - Body ground Always 10 kΩ or higher Ch1 female connector 6 or C35-6 (EKN2) - Body ground Always 10 kΩ or higher
Reconnect the Ch1 connector.
Reconnect the ECM connector.
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| OK | |
| 3.INSPECT ECM (VOLTAGE) |
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Disconnect the Ch1 connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition Ch1 female connector 2 - 5 Engine switch on (IG) 4.5 to 5.5 V Ch1 female connector 4 - 6 Engine switch on (IG) 4.5 to 5.5 V
Text in Illustration *a Front view of wire harness connector
(to ECM Wire)
Reconnect the Ch1 connector.
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| OK | ||
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| 4.INSPECT KNOCK SENSOR |
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Disconnect the Ch1 connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition Ch1 male connector 2 - 5 20°C (68°F) 120 to 280 kΩ Ch1 male connector 4 - 6 20°C (68°F) 120 to 280 kΩ
Text in Illustration *a Front view of wire harness connector
(to Knock Sensor Wire)
Reconnect the Ch1 connector.
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| OK | ||
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| 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 of the right bank.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit of the left bank.
Disconnect the Ch1 connector.
Disconnect the knock sensor connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition Ch1 male connector 2 - h2-2 Always Below 1 Ω Ch1 male connector 5 - h2-1 Always Below 1 Ω Ch1 male connector 4 - h1-2 Always Below 1 Ω Ch1 male connector 6 - h1-1 Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition Ch1 male connector 2 or h2-2 - Body ground Always 10 kΩ or higher Ch1 male connector 5 or h2-1 - Body ground Always 10 kΩ or higher Ch1 male connector 4 or h1-2 - Body ground Always 10 kΩ or higher Ch1 male connector 6 or h1-1 - Body ground Always 10 kΩ or higher
Reconnect the Ch1 connector.
- HINT:
- for Automatic Transmission
- Perform "Inspection After Repair" after replacing the knock control sensor (LandCruiser RM000004NJC03SX.html).
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| OK | ||
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