Imprint Contact 868 Videos
900.000 Callings


Wheel change
Save Energy

Video Multi-cylinder Engine
Video Inl. 2-cyl. 4-stroke
Video Inl. 2-cyl. 2-stroke
Video Opp. 2-cylinder
Video 2-cyl. V-engine
Video Inl. 3-cylinder
Video Inl. 4-cylinder
Video Opp. 4-cyl. 1
Video Opp. 4-cyl. 2
Video Inl. 5-cylinder
Video 5-cyl. V-Engine
Video Inl. 6-cylinder
Video 6-cyl. V-inline-engine
Video 6-cyl. V-engine
Video Opp. 6-cylinder
Video 8-cyl. Firing Order
Video 8-cyl. V-engine
Video 8-cyl.-V-Classic
Video V-8 Cylinder Block
Video V8 Turbo Engine
Video W-8 Cylinder Block
Video V-10 Cylinder Block
Video V-10 Diesel Engine
Video V-10 Porsche Engine
Video V-12 Engine
Video V-12 Cylinder Block
Video V-12 Ferrari Engine
Video W-12 Cylinder Block
Video W-12 Engine
Video Radial Engine
Video Rotary Radial Engine

Video Multi-cylinder 1
Video Multi-cylinder 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Temperature Sensor


As a passive sensor, the temperature sensor delivers information to the control unit about the momentary temperature of the coolant and thus of the engine.


Its resistance changes with the temperature. At a negative temperature coefficient (NTC), the ohmic resistance decreases as the temperature rises. This type of sensor is also called a 'hot-lead'. As a passive element, it is dependent on the control device for a voltage. The voltage change caused by the resistance is a measure of the engine temperature.

Reasonably priced component with a big effect ...

The resistances are accumulative. Should, e.g., an NTC-temperature sensor convey the coolant temperature to the control device and there is an additional resistance in play, it can happen that the fuei-air mixture is over-enriched, this can, at least partialy, be compensated for by the Lambda-regulation.

The temperature sensor used to be called 'The General', because of it's decisive influence on the mixture formation. If, e.g., it shows a minus temperature in the double figures range, the injection time of, normally a few milli-seconds when idling, can rise up to over 100. The car will then start only very unwillingly, or not at all. If the error continues for any length of time, the over-enrichment can have serious results for the engine. A typical indication would be the penetrating smell of petrol. 02/12               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

Our E-Book advertising