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:

Fuel Tank Pressure Sensor Inspection
Voltage Inspection NOTE: The fuel tank pressure sensor cannot be removed as a single unit. When replacing the fuel tank pressure sensor, replace it together with the charcoal canister as a single unit. 1. Disconnect the negative battery cable.. 2. Disconnect the fuel tank pres ...

Hydraulic Lash Adjuster, Rocker Arm
Purpose, Function HLA The HLA maintains the valve clearance at a constant 0 mm and maintenance-free valve clearance is realized. Rocker arm With the adoption of the needle roller bearing built into the rocker arm, the contact to the cam employs rolling contact to reduce sl ...

Manual Transaxle [C66 M R]
Purpose, Function The MTX converts the drive force (speed, torque, rotation direction) input from the engine according to the shift lever operation inside the vehicle. Construction Operation ...