Mazda CX-5 Service & Repair Manual: High Pressure Fuel Pump Control
Outline
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Changes the fuel pressure applied to the fuel injector according to engine operation conditions to improve engine output and startability.
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The PCM determines the fuel pressure value corresponding to the engine operation conditions based on the each input signal, and drives the spill valve control solenoid valve for optimum control of fuel pressure.
Block Diagram
OPERATION
Directly after engine start
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During a cold engine start, the fuel pressure is raised to promote fuel atomization.
Basic Control
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The PCM determines the target fuel pressure according to charging efficiency and performs feedback control by monitoring the fuel pressure in the fuel delivery pipe using the fuel pressure sensor.
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When idling after engine warm up: Approx. 3 MPa {31 kgf/cm2, 435 psi}
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After engine warm up, engine speed is 3,000 rpm or more, charging efficiency is 60 % or more: Approx. 15.0 MPa {153 kgf/cm2, 2176 psi}
Fuel Tank
Purpose, Function
Store fuel safely and supply fuel to the engine.
Construction
U.S.A. and CANADA
The fuel tank is installed below the rear seat.
2WD
AWD
T ...
High Pressure Fuel Pump Inspection
NOTE:
The following vacuum values are indicated by relative pressure from the fuel
pressure sensor.
1. Verify that the fuel pressure sensor is normal..
2. Connect the M-MDS to the D ...
Other materials:
Room Straight Line Dimensions (1) [Dimensions]
Point symbol
Designation
Hole diameter or bolt or nut size mm {in}
A
Front pillar inner datum hole
?7 {0.3}
B
Front pillar inner datum hole
?7 {0.3}
C
...
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 and eyes. To prevent this, always complete the “Fuel
Line Safety Procedure”, while referring ...
Power Steering
Power Steering
• Power steering is only operable when the
engine is running. If the engine is off or if the power steering system is inoperable,
you can still steer, but it requires more physical effort.
If the steering feels stiffer than usual during normal driving or the steering
vibrate ...
