Sensors - Alfa Romeo 159 Training Material

ENGINE

Sensors

Engine speed sensor
Camshaft timing sensor
High pressure fuel sensor
Knock sensor
Temperature sensor
Oil pressure on/off sensor
Oil level and temperature sensor
Air mass meter
Linear lambda sensor (post-cat)
Planar lambda sensor (pre-cat)
Engine speed sensor
FUNCTION: The sensor sends an electrical signal to the engine ECU used to compute the speed and angular
position of the engine.
FEATURES: The sensor consists of a body and metallic coil and a 2-pin connector.
OPERATION: The switch from empty to full due to the presence or absence of a tooth on the phonic wheel
determines variations in magnetic flow capable of generating induced alternating voltage which is used to count the
teeth on a ring (or phonic wheel). The frequency of the voltage sent to the ECU varies according to the angular speed
of the crankshaft.
The sensor connections to the engine ECU are:
CONNECTION TO ECU
- connector pin 1 to ECU pin 55 side A
- connector pin 2 to ECU pin 40 side A
REMOVAL/REFITTING: Fit the sensor by pressing it in the housing and fasten with a screw. Replace the sensor if it
is accidentally dropped.
POSITION: The crankcase sensor is positioned on the front side of the engine, in the bottom right: it faces the phonic
wheel positioned on the crankshaft.
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