Brand:
Toyota
Model Name:
Camry ACV40 GSV40
Manual:
Repair Manual
Section:
2Az-Fe Engine Control System
Title:
Sfi System
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
A flat type knock control sensor (non-resonant type) has a structure that can detect vibration between approximately 6 kHz and 15 kHz.Knock control sensors are fitted onto the engine block to detect engine knocking.
The knock control 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 control sensor is 0.5 V or less (1 trip detection logic) |
|
| P0328 | Output voltage of knock control sensor is 4.5 V or more (1 trip detection logic) |
|
- HINT:
- When any of DTCs P0327 and P0328 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 in the illustration.
| Item | Content |
| ECM Terminal Name | Between KNK1 and EKNK |
| Tester Range | 1 V/DIV., 1 ms./DIV. |
| Condition | Engine speed maintained at 4000 rpm after warming up engine |
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- 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 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.INSPECT ECM (KNK1 VOLTAGE)
Disconnect the knock control sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition C30-1 - C30-2 Ignition switch ON 4.5 to 5.5 V
Text in Illustration *1 Front view of wire harness connector
(to Knock Control Sensor)
Reconnect the knock control sensor connector.
| Go to step 3 | |||
| OK | |
 |
2.INSPECT KNOCK CONTROL SENSOR
Remove the knock control sensor.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 120 to 280 kΩ
Text in Illustration *1 Component without harness connected
(Knock Control Sensor)*2 Ohmmeter
Reinstall the knock control sensor.
| REPLACE KNOCK CONTROL SENSOR (Click here) | |||
| OK | |
 | |
| REPLACE ECM (Click here) | |
3.CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
Disconnect the knock control 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 C30-2 - C24-110 (KNK1) Always Below 1 Ω C30-1 - C24-111 (EKNK) Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition C30-2 or C24-110 (KNK1) - Body ground Always 10 kΩ or higher C30-1 or C24-111 (EKNK) - Body ground Always 10 kΩ or higher
Reconnect the knock control sensor connector.
Reconnect the ECM connector.
| REPAIR OR REPLACE HARNESS OR CONNECTOR (KNOCK CONTROL SENSOR - ECM) | |||
| OK | |
| |
| REPLACE ECM (Click here) | |