Alfa Romeo 159 Training Material page 102

ENGINE
Oil level and temperature sensor
FEATURES: The sensor monitors lubricant oil level and temperature inside the oil sump fitted underneath the engine
block. This sensor is not connected to the engine ECU: it interfaces with the instrument panel node (NQS) instead.
The diagram connection is:
SPLICE CONNECTION A
- connector pin 1 to splice pin 8
- connector pin 2 to splice pin 3
- connector pin 3 to splice pin 4
- connector pin 4 to splice pin 5
POSITION: The minimum oil level sensor connection is positioned on the front side of the engine, on the bottom right.
1. Oil level and temperature sensor fitting
Air mass meter
FEATURES: The air mass meter essentially consists of a heated film arranged in a
measuring channel through which engine intake air flows.
The hot film is kept at a constant temperature of 120°C (this is why a temperature sensor
is present) by a heating resistor.
The flow of intake air takes heat from the hot film causing a potential lowering of
temperature: the heat given up by the film is proportional to the intake air mass. A certain
current is circulated in the resistor to keep the film temperature constant: this current is
proportional to the given up heat.
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