P032511, P033011

DTC Code	DTC Name
P032511	Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground
P033011	Knock Sensor 2 Bank 2 Circuit Short to Ground

DESCRIPTION

A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 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.

Tech Tips

When DTC P032511 or P033011 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


*a	1 V/DIV.
*b	1 ms./DIV.

Tech Tips

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

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS 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.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
Tech Tips
- 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.

GTS 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

Tech Tips

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.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Tech Tips

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 transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
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

CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)

*a

Front view of wire harness connector

(to Knock Control Sensor)

*b

Bank 1

*c

Bank 2

Disconnect the knock control sensor connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
e7-1 - e7-2	Engine switch on (IG)	4.5 to 5.5 V
e8-1 - e8-2	Engine switch on (IG)	4.5 to 5.5 V

Result

Proceed to
OK
NG

NG

CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM) Click here

OK

INSPECT KNOCK CONTROL SENSOR

Inspect the knock control sensor.

Click here

Tech Tips

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

Click here

Result

Proceed to
OK
NG

OK

GO TO STEP 5 Click here

NG

REPLACE KNOCK CONTROL SENSOR Click here

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

Tester Connection	Condition	Specified Condition
e7-2 or F66-82 (KNK1) - Body ground	Always	10 kΩ or higher
e8-2 or F66-114 (KNK2) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTC.

Powertrain > Engine > Clear DTCs

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

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P032511 OR P033011)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

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

A

CHECK FOR INTERMITTENT PROBLEMS Click here

B

REPLACE ECM Click here

SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P032511, P033011