Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028HAR
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): Engine Oil Level Sensor Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

Engine Oil Level Sensor Circuit

DESCRIPTION

The combination meter assembly and engine oil level sensor are connected via direct line. The combination meter assembly determines the engine oil level based on the engine oil level sensor status signal.

HINT:

The coolant temperature signal and engine speed signal is sent from the ECM to the combination meter assembly via CAN communication. Because an accurate engine oil level cannot be detected when the engine is cold or operating at high speeds, warning control is only performed after the engine is warmed up and the engine is stopped or idling.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • When replacing the combination meter assembly, update the ECU security key.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: UPDATE ECU SECURITY KEY

  • The following troubleshooting procedure is based on the assumption that the SFI system is normal. Confirm that the SFI system is not malfunctioning before performing the following procedure.

    for HV Model: Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

    for Gasoline Model: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CHECK ENGINE OIL

(a) Check the engine oil level and engine oil quality is normally .

for HV Model: Click here 2020 - 2023 MY Corolla Corolla HV [01/2019 - 08/2023]; 2ZR-FXE (LUBRICATION): LUBRICATION SYSTEM: ON-VEHICLE INSPECTION 2024 - 2025 MY Corolla Corolla HV [08/2023 -        ]; 2ZR-FXE (LUBRICATION): LUBRICATION SYSTEM: ON-VEHICLE INSPECTION

for Gasoline Model: Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 08/2023]; M20A-FKS (LUBRICATION): LUBRICATION SYSTEM: ON-VEHICLE INSPECTION 2024 - 2025 MY Corolla Corolla Hatchback [08/2023 -        ]; M20A-FKS (LUBRICATION): LUBRICATION SYSTEM: ON-VEHICLE INSPECTION

NG

REPLACE OR ADD ENGINE OIL

OK

2.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Oil Level Switch

Engine oil level sensor input

OFF or ON

OFF: Engine oil level not low

ON: Engine oil level low

-

Body Electrical > Combination Meter > Data List

Tester Display

Oil Level Switch

Result

Proceed to

The Data List item changes correctly

A

The Data List item do not change correctly

B

A

REPLACE COMBINATION METER ASSEMBLY

B

3.

INSPECT ENGINE OIL LEVEL SENSOR

for HV Model: Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (LUBRICATION): OIL LEVEL SENSOR: INSPECTION

for Gasoline Model: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (LUBRICATION): OIL LEVEL SENSOR: INSPECTION

NG

REPLACE ENGINE OIL LEVEL SENSOR

for HV Model: Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (LUBRICATION): OIL LEVEL SENSOR: REMOVAL

for Gasoline Model: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (LUBRICATION): OIL LEVEL SENSOR: REMOVAL

OK

4.

CHECK HARNESS AND CONNECTOR (ENGINE OIL LEVEL SENSOR - COMBINATION METER ASSEMBLY)

(a) Disconnect the I4 combination meter assembly connector.

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

Standard Resistance (for TMC Made (for M20A-FKS)):

Tester Connection

Condition

Specified Condition

C38-1 (LVL) - I4-14 (OILW)

Always

Below 1 Ω

C38-1 (LVL) or I4-14 (OILW) - Body ground

Always

10 kΩ or higher

Standard Resistance (for HV Model (for 2ZR-FXE), for TMMMS Made (for M20A-FKS)):

Tester Connection

Condition

Specified Condition

C37-1 (LOIL) - I4-14 (OILW)

Always

Below 1 Ω

C37-1 (LOIL) or I4-14 (OILW) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR