Lexus ES: Engine Oil Temperature Sensor Circuit Short to Ground (P019511)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / A25a-fxs (engine Control) / Sfi System / Engine Oil Temperature Sensor Circuit Short to Ground (P019511)

DESCRIPTION

The engine oil temperature sensor replaces the oil temperature with electrical signals and outputs them to the ECM.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P019511	Engine Oil Temperature Sensor Circuit Short to Ground	The engine oil temperature sensor output voltage is less than 0.535 V for 5 seconds or more (1 trip detection logic).	Short in engine oil temperature sensor circuit Oil pressure and temperature sensor (engine oil temperature sensor) ECM	Except Mexico models: Comes on Mexico models: Does not come on	DTC stored	SAE Code: P0197 DTC for Mexico Models: Applies

HINT:

When this DTC is output, check the engine oil temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Engine Oil Temperature Sensor.

DTC No.	Engine Oil Temperature Sensor	Malfunction
P019511	-40°C (-40°F)	Short to ground in THEO circuit Short in EPEO to THEO circuit Open in VCPE circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

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MONITOR DESCRIPTION

The ECM monitors the engine oil temperature sensor and uses the sensor voltage to calculate the engine oil temperature. If the engine oil temperature sensor output voltage deviates from the normal operating range, the ECM determines that the engine oil temperature sensor circuit is malfunctioning and stores this DTC.

Example:

If the engine oil temperature sensor output voltage is less than 0.535 V for 5 seconds or more, the ECM will store this DTC.

MONITOR STRATEGY

Related DTCs	P0197: Engine oil temperature sensor range check (low voltage)
Required Sensors/Components (Main)	Engine oil temperature 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
Both of the following conditions are met	-
Auxiliary battery voltage	8 V or higher
Power switch	On (IG)

TYPICAL MALFUNCTION THRESHOLDS

Engine oil temperature sensor voltage [Engine oil temperature]

Less than 0.535 V [Less than -55°C (-67°F)]

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.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) [A].
Turn the Techstream on.
Wait 10 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P019511.

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 has a malfunction.
[A] to [C]: Normal judgment procedure.The normal judgment procedure is used to complete DTC judgment and also usedwhen clearing permanent DTCs.
[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 auxiliary 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

NOTICE:

Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
for NICKEL METAL HYDRIDE BATTERY:

Click here

for LITHIUM-ION BATTERY:

Click here

(Select Powertrain in Health Check and then check the time stamp data.)

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If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
for NICKEL METAL HYDRIDE BATTERY:

Click here

for LITHIUM-ION BATTERY:

Click here

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.	CHECK HARNESS AND CONNECTOR

*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.

(a) Disconnect the engine oil temperature sensor connector.

(b) Turn the power switch on (IG).

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

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

(e) 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

REPLACE OIL PRESSURE AND TEMPERATURE SENSOR

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

(a) Disconnect the engine oil temperature sensor connector.

(b) Disconnect the ECM connector.

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

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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