DTC P0195-15: Engine Oil Temperature Sensor Circuit Short to Battery or Open [07/2019 - 10/2019]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CONFIRM MODEL

Choose the model to be inspected.

Result

Result	Proceed to
for TMC Made	A
for TMMK Made	B

Result:

See step 4

Result:

See step 2

CHECK HARNESS AND CONNECTOR

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Engine Oil Temperature Sensor)

HINT:

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

Disconnect the engine oil temperature sensor connector.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C116-3 (VC) - C116-2 (GND)	Power switch on (IG)	4.5 to 5.5 V
C116-4 (TOUT) - C116-2 (GND)	Power switch on (IG)	0.54 to 4.86 V

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

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
C116-2 (GND) - Body ground	Power switch off	Below 1 Ω
C116-3 (VC) - C116-4 (TOUT)	Power switch off	171 to 189 kΩ

Result

Proceed to
OK
NG

Result:

REPLACE OIL PRESSURE AND TEMPERATURE SENSOR. Refer to REMOVAL [07/2019 - ]

Result:

See step 3

CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)

Disconnect the engine oil temperature 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
C116-2 (GND) - C88-100 (EPEO)	Always	Below 1 Ω
C116-4 (TOUT) - C88-123 (THEO)	Always	Below 1 Ω
C116-4 (TOUT) or C88-123 (THEO) - Other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE ECM. Refer to REMOVAL [06/2018 - 08/2020]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Engine Oil Temperature Sensor	*2	ECM
*a	Front view of wire harness connector (to Engine Oil Temperature Sensor)	-	-

Disconnect the engine oil temperature sensor connector.
Connect terminals 1 and 2 of the engine oil temperature sensor connector on the wire harness side.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Engine Oil Temperature Sensor.

Powertrain > Engine > Data List

Tester Display
Engine Oil Temperature Sensor

According to the display on the Techstream, read the Data List.

Techstream Display	Specified Condition
Engine Oil Temperature Sensor	Higher than 168°C (334°F)

Result

Proceed to
OK
NG

Result:

REPLACE ENGINE OIL TEMPERATURE SENSOR. Refer to REMOVAL [06/2018 - 10/2019]

Result:

See step 5

CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)

Disconnect the engine oil temperature 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
C64-1 - C88-123 (THEO)	Always	Below 1 Ω
C64-2 - C88-104 (ETHE)	Always	Below 1 Ω
C64-1 or C88-123 (THEO) - Other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE ECM. Refer to REMOVAL [06/2018 - 08/2020]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR