Mazda CX-5 Service & Repair Manual: Fuel Pump Control

Mazda CX-5 Service & Repair Manual / Engine / Fuel / Fuel Pump Control

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 drive force 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	When engine is stopped

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%	Feedback value from fuel pressure sensor is the specified value or more (Determined that high pressure fuel pump compression is high.) Except for control conditions with output duty ratio of 5% or 95%
5%	When engine is stopped

Fuel pump operation circuit diagram

Fuel Pump Control Module

Purpose, Function Controls the voltage applied to the fuel pump for reducing fuel pump load and improving fuel economy. Controls the voltage applied to the fuel pump based on the con ...

Fuel Pump Unit Disassembly/Assembly

WARNING: Fuel is very flammable liquid. If fuel spills or leaks from the pressurized fuel system, it will cause serious injury or death and facility breakage. Fuel can also irritate skin ...

Other materials:

Oil Shower Pipe
Outline Mechanical resistance loss has been reduced through structural changes to achieve optimum fuel economy. An oil shower pipe has been adopted as a part of this structural change. Purpose, Function The oil shower pipe injects engine oil to lubricate the contact points ...

Restraints
Abbreviations AAS Active Adaptive Shift ABS Antilock Brake System ABDC After Bottom Dead Center ACC Accessories AFS Adaptive Front Lighting System ...

Climate Control Unit Inspection [Full Auto Air Conditioner]
1. Remove the climate control unit with the connector connected.. 2. Switch the ignition ON (engine off or on). 3. Connect the negative (-) lead of the tester to body ground. 4. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage acco ...