Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)
INSPECT ECM (KNK1 VOLTAGE)
INSPECT KNOCK SENSOR
CHECK HARNESS AND CONNECTOR (ECM - 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) |
DESCRIPTION
Flat-type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 6 kHz and 15 kHz.The 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
| The output voltage of the knock sensor is below 0.5 V (1 trip detection logic).
| - Short in knock sensor circuit
- Knock sensor
- ECM
|
P0328
| The output voltage of the knock sensor is higher than 4.5 V (1 trip detection logic).
| - Open in knock sensor circuit
- Knock sensor
- ECM
|
- 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. The ECM continues operating in fail-safe mode until the ignition switch is turned off.
Reference: Inspection using an oscilloscope
The correct waveform is as shown.Item
| Content
|
ECM Terminal Name
| KNK1 - EKNK
|
Tester Range
| 1 V/DIV., 1 ms./DIV.
|
Condition
| Engine speed maintained at 4000 rpm after engine warmed up
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the intelligent tester. 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 VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE) |
Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.
Read the values displayed on the tester while the vehicle is being driven.
- OK:
- The values change.
- HINT:
Malfunction does not occur
| Knock feedback values change
|
Malfunction occurs
| Knock feedback values do 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.
| 2.INSPECT ECM (KNK1 VOLTAGE) |
Disconnect the knock sensor connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
S1-2 - S1-1
| Ignition switch ON
| 4.5 to 5.5 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Knock Sensor)
|
Reconnect the knock sensor connector.
Inspect the knock sensor (HILUX_TGN26 RM000000VWF01RX.html).
| 4.CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR) |
Disconnect the knock sensor 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
|
S1-2 - C95-6 (KNK1)
| Always
| Below 1 Ω
|
S1-1 - C95-5 (EKNK)
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
S1-2 or C95-6 (KNK1) - Body ground
| Always
| 10 kΩ or higher
|
S1-1 or C95-5 (EKNK) - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the knock sensor connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK SENSOR) |
|
|
