Oil temperature sensor | HELLA
General
Depending on the type of vehicle, oil temperature sensors may be installed in addition to oil pressure sensors in some vehicles.
The oil temperature sensor sends its information to a separate instrument or to the ECU for monitoring the oil temperature of the engine. In modern vehicles, oil temperature sensors are integrated into the oil level sensor.
Function
In the housing of the temperature sensor, there is a measuring resistor made of semiconductor material having a negative temperature coefficient (NTC). This measuring resistor has a high resistance at low temperatures, which decreases with increasing temperatures.
Possible causes of failure
· Contact failure on connector
· Internal short-circuits
· Damaged measuring element
Effects of failure
- Missing or incorrect information about the engine oil temperature
Troubleshooting
· Check electrical connectors and wiring for proper fit or damage.
· Verify the resistance values of the sensor.
Important safety notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.
The reprinting, distribution, reproduction, exploitation in any form and disclosure of the contents of this document, even in part, is prohibited without our express written approval and indication of the source. The schematic illustrations, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.
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