FUEL PUMP CONTROL [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)]

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Outline

•  By switching the fuel pump discharge amount, reduced power consumption and improved fuel economy have been achieved.
•  The PCM determines the optimum fuel pump discharge amount according to the engine operation conditions, and sends the fuel pump drive signal to the fuel pump control module.

Block Diagram

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Operation


Fuel pump relay

•  The PCM switches the fuel pump relay on/off according to the engine operation conditions.

Relay ON/OFF

Control conditions
ON
•  When any of the following conditions is met:
―  When ignition is switched ON (for approx. 1 s)
―  During engine cranking
―  While engine is running
OFF
•  When engine is stopped
•  Immobilizer system related information (engine start prohibited) received from start stop unit
•  Collision signal from SAS control module is received


Fuel pump control module

•  The PCM determines the fuel pump discharge amount according to the engine operation conditions, and controls the output duty ratio to the fuel pump control module according to the discharge amount.

Output duty ratio

Control conditions
95%
•  When any of the following conditions is met:
―  At engine start
―  Fuel pump control module malfunction (if request voltage is unobtainable)
10—90%
•  Except for control conditions with output duty ratio of 5% or 95%

Fuel pump operation circuit diagram

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