- Short in knock sensor circuit
- Knock sensor
- ECM
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000SVT05EX |
| Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
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 6 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 |
Output voltage of knock sensor less than 0.5 V (1 trip detection logic) |
|
|
P0328 P0333 |
Output voltage of knock sensor more than 4.5 V (1 trip detection logic) |
|
HINT:
When any of DTCs P0327, P0328, P0332 and P0333 are 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
The correct waveform is as shown.
|
Item |
Content |
|---|---|
|
Terminal |
KNK1 - EKNK KNK2 - EKN2 |
|
Equipment Setting |
1 V/DIV. 1 msec./DIV. |
|
Condition |
Keep engine speed 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.
MONITOR STRATEGY
|
Related DTCs |
P0327: Knock sensor (for bank 1) range check (Low voltage) P0328: Knock sensor (for bank 1) range check (High voltage) P0332: Knock sensor (for bank 2) range check (Low voltage) P0333: Knock sensor (for bank 2) range check (High voltage) |
|
Required Sensors/Components (Main) |
Knock sensor |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
1 second |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs not present |
None |
|
Battery voltage |
10.5 V or more |
|
Time after engine start |
5 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low Voltage) P0327 and P0332
|
Knock sensor voltage |
Less than 0.5 V |
Knock Sensor Range Check (High Voltage) P0328 and P0333
|
Knock sensor voltage |
More than 4.5 V |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- DTCs P0327 and P0328 are the bank 1 knock sensor circuit.
- DTCs P0332 and P0333 are the bank 2 knock sensor circuit.
- Read freeze frame data using the Techstream. 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.
PROCEDURE
|
1. |
READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT) |
(a) Disconnect the ED2 connector.
(b) Using lead wires, connect the connectors as follows:
|
Male Connector - Female Connector |
|---|
|
Terminal 10 - Terminal 4 |
|
Terminal 9 - Terminal 5 |
|
Terminal 4 - Terminal 10 |
|
Terminal 5 - Terminal 9 |
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream ON.
(f) Clear DTCs
.
(g) Warm up the engine.
(h) Run the engine at 3000 rpm for 10 seconds or more.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes.
(j) Read the DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is same as when vehicle brought in (for example, P0327 and P0328 are output again, or P0332 and P0333 are output again) |
A |
|
DTC is different from when vehicle brought in (for example, P0327 and P0328 are output at first, but then P0332 and P0333 are output, or vice versa) |
B |
HINT:
- If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the left bank side.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the right bank side.
|
|
2. |
CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM) |
(a) Disconnect the ED2 connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
ED2 male connector 10 - D56-94 (KNK1) |
Always |
Below 1 Ω |
|
ED2 male connector 9 - D56-93 (EKNK) |
Always |
Below 1 Ω |
|
ED2 male connector 4 - D56-117 (KNK2) |
Always |
Below 1 Ω |
|
ED2 male connector 5 - D56-116 (EKN2) |
Always |
Below 1 Ω |
|
ED2 male connector 10 or D56-94 (KNK1) - Body ground |
Always |
10 kΩ or higher |
|
ED2 male connector 9 or D56-93 (EKNK) - Body ground |
Always |
10 kΩ or higher |
|
ED2 male connector 4 or D56-117 (KNK2) - Body ground |
Always |
10 kΩ or higher |
|
ED2 male connector 5 or D56-116 (EKN2) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
INSPECT ECM (VOLTAGE) |
(a) Disconnect the ED2 connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
ED2 male connector 10 - 9 |
Ignition switch ON |
4.5 to 5.5 V |
|
ED2 male connector 4 - 5 |
Ignition switch ON |
4.5 to 5.5 V |
|
|
4. |
INSPECT KNOCK SENSOR |
(a) Disconnect the ED2 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
ED2 female connector 10 - 9 |
20°C (68°F) |
120 to 280 kΩ |
|
ED2 female connector 4 - 5 |
20°C (68°F) |
120 to 280 kΩ |
Result
|
Result |
Proceed to |
|---|---|
|
Outside standard range |
A |
|
Within standard range |
B |
|
|
5. |
CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR) |
(a) Disconnect the ED2 connector.
(b) Disconnect the knock sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
ED2 female connector 10 - E10-2 |
Always |
Below 1 Ω |
|
ED2 female connector 9 - E10-1 |
Always |
Below 1 Ω |
|
ED2 female connector 4 - E9-2 |
Always |
Below 1 Ω |
|
ED2 female connector 5 - E9-1 |
Always |
Below 1 Ω |
|
ED2 female connector 10 or E10-2 - Body ground |
Always |
10 kΩ or higher |
|
ED2 female connector 9 or E10-1 - Body ground |
Always |
10 kΩ or higher |
|
ED2 female connector 4 or E9-2 - Body ground |
Always |
10 kΩ or higher |
|
ED2 female connector 5 or E9-1 - Body ground |
Always |
10 kΩ or higher |
|
|
|