DESCRIPTION
A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 and 23 kHz.
The knock control sensor is 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.
HINT:
When DTC P032511 is 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.
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Note |
---|---|---|---|---|---|
P032511 | Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground |
The knock control sensor output voltage is less than 0.5 V for 1 second or more (1 trip detection logic). |
| Comes on |
|
Reference: Inspection using an oscilloscope
HINT:
The correct waveform is as shown.
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 |
MONITOR DESCRIPTION
If the output voltage transmitted by the knock control sensor remains low for 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, illuminates the MIL and stores this DTC.
MONITOR STRATEGY
Related DTCs | P0327: Knock control sensor range check (low voltage) |
Required Sensors/Components (Main) | Knock control 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 the following DTCs are not stored |
None |
Both of the following conditions are met |
- |
Auxiliary battery voltage |
10.5 V or higher |
Time after engine start |
5 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
Knock control sensor voltage | Less than 0.5 V |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
HINT:
GTS Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Read Freeze Frame Data using the GTS. 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.
PROCEDURE
1. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR) |
*a | Front view of wire harness connector (to Knock Control Sensor) |
(a) Disconnect the knock control 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 | Condition |
Specified Condition |
---|---|---|
Z1-2 - Z1-1 | Ignition switch ON |
4.5 to 5.5 V |
NG | ![]() | GO TO STEP 3 |
|
2. |
INSPECT KNOCK CONTROL SENSOR |
Click here
HINT:
Perform "Inspection After Repair" after replacing the knock control sensor.
Click here
OK | ![]() | GO TO STEP 4 |
NG | ![]() | REPLACE KNOCK CONTROL SENSOR
|
3. |
CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM) |
(a) Disconnect the knock control sensor 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 |
---|---|---|
Z1-2 or C76-111 (KNK1) - Body ground |
Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
5. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P032511) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Read the DTCs.
Powertrain > Engine > Trouble Codes
Result | Proceed to |
---|---|
DTCs are not output | A |
DTC P032511 is output |
B |
A |
![]() | CHECK FOR INTERMITTENT PROBLEMS |
B |
![]() | REPLACE ECM
|