Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002B52C
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [03/2023 -           ]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P052012; Engine Oil Pressure Sensor/Switch "A" Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]

DTC

P052012

Engine Oil Pressure Sensor/Switch "A" Circuit Short to Battery

DESCRIPTION

Variable oil pump control uses the oil pressure control valve assembly, oil pressure and temperature sensor and ECM to optimize the oil pressure and oil volume required by each component to reduce friction by monitoring the engine temperature and engine speed. The oil pressure sensor utilizes a semiconductor type pressure sensor that changes resistance in accordance with changes in pressure. An internal electrical signal that varies with the change in resistance is amplified and sent to the ECM as the engine oil pressure signal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P052012

Engine Oil Pressure Sensor/Switch "A" Circuit Short to Battery

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • The oil pressure sensor output voltage is higher than 4.495 V.

Malfunction time:

  • 5 seconds or more

Trip logic:

  • 1 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection:

  • Oil pressure sensor
  • Open or short in oil pressure sensor circuit
  • Oil pressure and temperature sensor (oil pressure sensor)
  • ECM

Comes on

DTC stored
  • SAE Code: P0523
  • DTC for Mexico Models: Applies

Related Data List

DTC No.

Data List

P052012

Engine Oil Pressure

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the oil pressure sensor is higher than 4.495 V for 5 seconds or more, the ECM determines that the oil pressure sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0523: Engine oil pressure sensor range check (high voltage)

Required Sensors/Components (Main)

Oil pressure sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Battery voltage

8 V or higher

Ignition switch

ON

Starter

Off

TYPICAL MALFUNCTION THRESHOLDS

Engine oil pressure sensor voltage

Higher than 4.495 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 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream 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. Turn the ignition switch to ON [A].
  7. Turn the Techstream on.
  8. Wait 10 seconds or more [B].
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Proceed to the next screen and enter the DTC to be checked.
  13. 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, perform steps [A] through [C] again.
  • [A] to [C]: 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:

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.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

2.

CHECK DTC OUTPUT (DTC P052012 OR P052014)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the oil pressure sensor connector.

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

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

(d) Read the DTCs.

Powertrain > Engine > Trouble Codes

HINT:

When the ECM, wire harnesses and connectors are normal, DTC P052014 will be stored when the connector of the sensor is disconnected.

Result

Proceed to

DTC P052014 is output

A

DTC P052012 is output

B
B

GO TO STEP 5

A

3.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - BODY GROUND)

(a) Disconnect the oil pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C41-2 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE OIL PRESSURE AND TEMPERATURE SENSOR

NG

4.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)

(a) Disconnect the oil pressure sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (for K120):

Tester Connection

Condition

Specified Condition

C41-2 (GND) - C76-100 (EPEO)

Always

Below 1 Ω

Standard Resistance (for K121):

Tester Connection

Condition

Specified Condition

C41-2 (GND) - C160-145 (EPEO)

Always

Below 1 Ω
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK TERMINAL VOLTAGE (OIL PRESSURE SENSOR)

*a

Front view of wire harness connector

(to Oil Pressure Sensor)

(a) Disconnect the oil pressure 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

C41-1 (POUT) - Body ground

Ignition switch ON

0 to 5.5 V
NG

GO TO STEP 7

OK

6.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)

(a) Disconnect the oil pressure sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (for K120):

Tester Connection

Condition

Specified Condition

C41-3 (VC) - C41-1 (POUT) or C76-99 (VCPE) - C76-122 (PEO)

Always

10 kΩ or higher

Standard Resistance (for K121):

Tester Connection

Condition

Specified Condition

C41-3 (VC) - C41-1 (POUT) or C160-146 (VCPE) - C160-175 (PEO)

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)

(a) Disconnect the oil pressure sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (for K120):

Tester Connection

Condition

Specified Condition

C41-1 (POUT) or C76-122 (PEO) - other terminals

Always

10 kΩ or higher

Standard Resistance (for K121):

Tester Connection

Condition

Specified Condition

C41-1 (POUT) or C178-175 (PEO) - other terminals

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR