Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
2Gr-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
CHECK WIRE 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
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.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0327 P0332 | Output voltage of knock sensor 1 or 2 is 0.5 V or less (1 trip detection logic) |
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| P0328 P0333 | Output voltage of knock sensor 1 or 2 is 4.5 V or more (1 trip detection logic) |
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- 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.
The correct waveform is as shown.
| Item | Content |
| Terminal | KNK1 - EKNK or KNK2 -EKN2 |
| Equipment Setting | 0.01 to 10 V/DIV. 0.01 to 10 ms./DIV. |
| Condition | Keep engine speed at 4000 rpm with warm engine |
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 intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (RAV4_ACA30 RM000000PDS09FX.html).
| 1.READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT) |
Disconnect the connector.
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Using lead wires, connect the connectors as follows:
Male Connector - Female Connector Terminal 2 - Terminal 4 Terminal 1 - Terminal 3 Terminal 4 - Terminal 2 Terminal 3 - Terminal 1
Warm up the engine.
Run the engine at 3000 rpm for 10 seconds or more.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
- Result:
Display Proceed to DTCs same as when vehicle brought in P0327, P0328 → P0327, P0328 or P0332, P0333 → P0332, P0333 A DTCs different from when vehicle brought in P0327, P0328 → P0332, P0333 or P0332, P0333 → P0327, P0328 B
Reconnect the connector.
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| A | |
| 2.CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM) |
Disconnect the connector.
 |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Check for open):
- Bank 1:
Tester Connection Specified Condition Bi1 female connector 2 - KNK1 (B96-95) Below 1 Ω Bi1 female connector 1 - EKNK (B96-94) Below 1 Ω - Bank 2:
Tester Connection Specified Condition Bi1 female connector 4 - KNK2 (B96-118) Below 1 Ω Bi1 female connector 3 - EKN2 (B96-117) Below 1 Ω
- Standard resistance (Check for short):
- Bank 1:
Tester Connection Specified Condition Bi1 female connector 2 or KNK1 (B96-95) - Body ground 10 kΩ or higher Bi1 female connector 1 or EKNK (B96-94) - Body ground 10 kΩ or higher - Bank 2:
Tester Connection Specified Condition Bi1 female connector 4 or KNK2 (B96-118) - Body ground 10 kΩ or higher Bi1 female connector 3 or EKN2 (B96-117) - Body ground 10 kΩ or higher
Reconnect the connector.
Reconnect the ECM connector.
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| OK | |
| 3.INSPECT ECM |
Disconnect the connector.
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Turn the ignition switch to the ON position.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Specified Condition Bi1 female connector 2 - 1 4.5 to 5.5 V Bi1 female connector 4 - 3 4.5 to 5.5 V
Reconnect the ECM connector.
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| OK | ||
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| 4.INSPECT KNOCK SENSOR |
Disconnect the connector.
 |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Specified Condition Bi1 male connector 1 - 2 120 to 280 kΩ Bi1 male connector 3- 4 120 to 280 kΩ
Reconnect the connector.
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| NG | |
| 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.
Disconnect the connector.
 |
Disconnect the knock sensor connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Check for open):
- Bank 1:
Tester Connection Specified Condition Bi1 male connector 2 - i2-2 Below 1 Ω Bi1 male connector 1 - i2-1 Below 1 Ω - Bank 2:
Tester Connection Specified Condition Bi1 male connector 4 - i1-2 Below 1 Ω Bi1 male connector 3 - i1-1 Below 1 Ω
- Standard resistance (Check for short):
- Bank 1:
Tester Connection Specified Condition Bi1 male connector 2 or i2-2 - Body ground 10 kΩ or higher Bi1 male connector 1 or i2-1 - Body ground 10 kΩ or higher - Bank 2:
Tester Connection Specified Condition Bi1 male connector 4 or i1-2 - Body ground 10 kΩ or higher Bi1 male connector 3 or i1-1 - Body ground 10 kΩ or higher
Reconnect the connector.
Reconnect the knock sensor connectors.
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| OK | ||
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