Fuel Injection System - Alfa Romeo 159 Training Material

ENGINE
The sensor connections to the engine ECU are:
CONNECTION TO ECU
- connector pin 1 to ECU pin 83
side K
- connector pin 2 to ECU pin 61
side K
- connector pin 3 to ECU pin 60
side K
- connector pin 4 to ECU pin 59
side K
- connector pin 5 to ECU pin 81
side K
- connector pin 6 to ECU pin 82
side K
Electrical specifications:
SENSOR FEATURES
OUTPUT SIGNAL TYPE

Fuel injection system

FEATURES: The direct injection system injects fuel directly inside the cylinder. The main advantages are better fuel
evaporation and increased engine volumetric yield because evaporation heat is subtracted from the suction air
instead of from the intake manifold walls. The air and petrol load therefore has a higher density and is cooler: this
reduces the compression ratio which has been set to a high value (11.3) despite the use of Euro Super petrol with a
relatively low octane rating of 95. The high compression ratio is useful to increase performance and increase engine
energy efficiency.
Fuel consumption is reduced by up to 20% with respect to similar traditional injection spark ignition engines thanks to
direct injection. CO emissions are reduced on the road.
2
Consumption reduction is possible with direct fuel injection when the engine can switch from stratified (partial load) to
homogenous (full load).
Injection system requirements include:
- extreme precision of the injected fuel quantity
- generation of the necessary injection pressure
- definition of precise instant of ignition of the mixture according to the operating mode of the engine
- fuel introduction directly and accurately into the engine combustion chamber.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
CONNECTOR
Double resistance sensor
Power voltage: 5 V
Electrical voltage signal
Variable resistance according to accelerator pedal position
Resistance track 1: 1.2 kOhm
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After Sales Training
DRAWING
1.5 kOhm (pedal 50%)
1.9 kOhm (pedal 100%)
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Fiat Auto S.p.A.