- Short in knock sensor (for Bank 1 Sensor 1) circuit
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000SVT05DX |
| Title: 3UR-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 |
P032C |
Knock Sensor 3 Circuit Low |
|
DTC |
P032D |
Knock Sensor 3 Circuit High |
|
DTC |
P0332 |
Knock Sensor 2 Circuit Low Input (Bank 2) |
|
DTC |
P0333 |
Knock Sensor 2 Circuit High Input (Bank 2) |
|
DTC |
P033C |
Knock Sensor 4 Circuit Low Input |
|
DTC |
P033D |
Knock Sensor 4 Circuit High Input |
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations 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 |
Output voltage of knock sensor (for Bank 1 Sensor 1) is 0.5 V or less (1 trip detection logic) |
|
|
P0328 |
Output voltage of knock sensor (for Bank 1 Sensor 1) is 4.5 V or more (1 trip detection logic) |
|
|
P0332 |
Output voltage of knock sensor (for Bank 2 Sensor 1) is 0.5 V or less (1 trip detection logic) |
|
|
P0333 |
Output voltage of knock sensor (for Bank 2 Sensor 1) is 4.5 V or more (1 trip detection logic) |
|
|
P032C |
Output voltage of knock sensor (for Bank 1 Sensor 2) is 0.5 V or less (1 trip detection logic) |
|
|
P032D |
Output voltage of knock sensor (for Bank 1 Sensor 2) is 4.5 V or more (1 trip detection logic) |
|
|
P033C |
Output voltage of knock sensor (for Bank 2 Sensor 2) is 0.5 V or less (1 trip detection logic) |
|
|
P033D |
Output voltage of knock sensor (for Bank 2 Sensor 2) is 4.5 V or more (1 trip detection logic) |
|
HINT:
When any of DTCs P0327, P0328, P0332, P0333, P032C, P032D, P033C and P033D 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
Standard:
|
Tester Connection |
Tool Setting |
Condition |
Specified Condition |
|---|---|---|---|
|
D56-94 (KNK1) - D56-93 (EKNK) |
0.01 to 10 V/DIV. 0.01 to 10 msec./DIV. |
Keep engine speed at 4000 rpm with warm engine |
The correct waveform is as shown |
|
D56-117 (KNK2) - D56-116 (EKN2) |
0.01 to 10 V/DIV. 0.01 to 10 msec./DIV. |
Keep engine speed at 4000 rpm with warm engine |
The correct waveform is as shown |
|
D56-96 (KNK3) - D56-95 (EKN3) |
0.01 to 10 V/DIV. 0.01 to 10 msec./DIV. |
Keep engine speed at 4000 rpm with warm engine |
The correct waveform is as shown |
|
D56-119 (KNK4) - D56-118 (EKN4) |
0.01 to 10 V/DIV. 0.01 to 10 msec./DIV. |
Keep engine speed at 4000 rpm with warm engine |
The correct waveform is as shown |
MONITOR DESCRIPTION
The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and stores a DTC.
MONITOR STRATEGY
|
Related DTCs |
P0327: Knock sensor (for Bank 1 Sensor 1) open/short (Low voltage) P0328: Knock sensor (for Bank 1 Sensor 1) open/short (High voltage) P0332: Knock sensor (for Bank 2 Sensor 1) open/short (Low voltage) P0333: Knock sensor (for Bank 2 Sensor 1) open/short (High voltage) P032C: Knock sensor (for Bank 1 Sensor 2) open/short (Low voltage) P032D: Knock sensor (for Bank 1 Sensor 2) open/short (High voltage) P033C: Knock sensor (for Bank 2 Sensor 2) open/short (Low voltage) P033D: Knock sensor (for Bank 2 Sensor 2) open/short (High voltage) |
|
Required Sensors/Components (Main) |
Knock sensor (Bank 1, 2 Sensor 1, 2) |
|
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 are 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, P0332, P032C and P033C
|
Knock sensor voltage |
Less than 0.5 V |
Knock Sensor Range Check (High Voltage): P0328, P0333, P032D and P033D
|
Knock sensor voltage |
More than 4.5 V |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- DTCs P0327 and P0328 are for the bank 1 sensor 1 knock sensor circuit.
- DTCs P032C and P032D are for the bank 1 sensor 2 knock sensor circuit.
- DTCs P0332 and P0333 are for the bank 2 sensor 1 knock sensor circuit.
- DTCs P033C and P033D are for the bank 2 sensor 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. |
INSPECT KNOCK SENSOR |
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D56-94 (KNK1) - D56-93 (EKNK) |
20°C (68°F) |
120 to 280 kΩ |
|
D56-117 (KNK2) - D56-116 (EKN2) |
20°C (68°F) |
120 to 280 kΩ |
|
D56-96 (KNK3) - D56-95 (EKN3) |
20°C (68°F) |
120 to 280 kΩ |
|
D56-119 (KNK4) - D56-118 (EKN4) |
20°C (68°F) |
120 to 280 kΩ |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK |
B |
|
|
2. |
CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR) |
(a) Disconnect the ECM 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 |
|---|---|---|
|
b1-2 - D56-94 (KNK1) |
Always |
Below 1 Ω |
|
b1-1 - D56-93 (EKNK) |
Always |
Below 1 Ω |
|
b2-2 - D56-117 (KNK2) |
Always |
Below 1 Ω |
|
b2-1 - D56-116 (EKN2) |
Always |
Below 1 Ω |
|
b3-2 - D56-96 (KNK3) |
Always |
Below 1 Ω |
|
b3-1 - D56-95 (EKN3) |
Always |
Below 1 Ω |
|
b4-2 - D56-119 (KNK4) |
Always |
Below 1 Ω |
|
b4-1 - D56-118 (EKN4) |
Always |
Below 1 Ω |
|
b1-2 or D56-94 (KNK1) - Body ground |
Always |
10 kΩ or higher |
|
b1-1 or D56-93 (EKNK) - Body ground |
Always |
10 kΩ or higher |
|
b2-2 or D56-117 (KNK2) - Body ground |
Always |
10 kΩ or higher |
|
b2-1 or D56-116 (EKN2) - Body ground |
Always |
10 kΩ or higher |
|
b3-2 or D56-96 (KNK3) - Body ground |
Always |
10 kΩ or higher |
|
b3-1 or D56-95 (EKN3) - Body ground |
Always |
10 kΩ or higher |
|
b4-2 or D56-119 (KNK4) - Body ground |
Always |
10 kΩ or higher |
|
b4-1 or D56-118 (EKN4) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
INSPECT ECM |
(a) Disconnect the knock sensor 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 |
|---|---|---|
|
1 - 2 |
Ignition switch ON |
4.5 to 5.5 V |
|
|
|