Toyota Yaris: Sfi System / Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511)

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).

  • Short in knock control sensor circuit
  • Knock control sensor
  • ECM

Comes on

SAE: P0327

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 the 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

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Start the engine and wait 5 minutes.
  7. Turn the GTS on.
  8. Enter the following menus: Powertrain / Engine / Trouble Codes.
  9. 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.
  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  11. Input the DTC: P032511.
  12. 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

    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.

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) 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

e1-2(KNK1) - e1-1(EKNK)

Ignition switch ON

4.5 to 5.5 V

*a

Front view of wire harness connector

(to Knock Control Sensor)

NG

GO TO STEP 3

OK

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

e1-2(KNK1) or D104-111(KNK1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(b) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

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

P032511 is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE ECM

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