FUEL PUMP CONTROL [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

FUEL PUMP CONTROL [SKYACTIV-G 2.5]

Outline

By switching the fuel pump discharge amount, reduced power consumption and improved fuel economy have been realized.

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

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	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%
5%	When engine is stopped

Fuel pump operation circuit diagram

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