Lexus ES: Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511,P033011)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511,P033011)

DESCRIPTION

A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 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 engine switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P032511	Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground	The knock control sensor (bank 1) output voltage is less than 0.5 V for 1 second or more (1 trip detection logic).	Short in knock control sensor (bank 1) circuit Knock control sensor (bank 1) ECM	Comes on	DTC stored	SAE Code: P0327
P033011	Knock Sensor 2 Bank 2 Circuit Short to Ground	The knock control sensor (bank 2) output voltage is less than 0.5 V for 1 second or more (1 trip detection logic).	Short in knock control sensor (bank 2) circuit Knock control sensor (bank 2) ECM	Comes on	DTC stored	SAE Code: P0332

Reference: Inspection using an oscilloscope

HINT:

The correct waveform is as shown.

ECM Terminal Name

Between KNK1 and EKNK

Between KNK2 and EKN2

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, and stores this DTC.

MONITOR STRATEGY

Related DTCs	P0327: Knock control sensor (bank 1) range check (low voltage) P0332: Knock control sensor (bank 2) 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	-
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:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Start the engine and wait 5 minutes [A].
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P032511 or P033011.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.
[A] to [B]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

DTC P032511 is for the bank 1 knock control sensor circuit.
DTC P033011 is for the bank 2 knock control sensor circuit.
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
Read freeze frame data using the Techstream. 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)

Front view of wire harness connector

(to Knock Control Sensor)

Bank 1

Bank 2

(a) Disconnect the knock control sensor connector.

(b) Turn the engine switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
F6-1 (EKNK) - F6-2 (KNK1)	Engine switch on (IG)	4.5 to 5.5 V
F7-1 (EKN2) - F7-2 (KNK2)	Engine switch on (IG)	4.5 to 5.5 V

GO TO STEP 3

2.	INSPECT KNOCK CONTROL SENSOR

(a) Inspect the knock control sensor.

Click here

HINT:

Perform "Inspection After Repair" after replacing the knock control sensor.

Click here

GO TO STEP 4

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F6-2 (KNK1) or C32-82 (KNK1) - Body ground	Always	10 kΩ or higher
F7-2 (KNK2) or C32-114 (KNK2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P032511 OR P033011)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P032511 or P033011 is output	B

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

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Disassembly

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Installation

INSTALLATION CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. PRECAUTION NOTICE: After turning the engine switch (for Gasoline Model) or power switch (for HV Model) off, waiting time may be required bef

Lexus ES: Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511,P033011)

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