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:

Front Console Removal/Installation
CAUTION: Affix protective tape to the position shown in the figure. 1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Decoration panel. b. Shift lever knob (MTX). c. Front console box. d. Shift panel. e. Upper panel. f. Rear console. g. ...

Ambient Temperature Display
Purpose The ambient temperature display notifies the user of the ambient temperature. Function The instrument cluster displays the ambient temperature based on the ambient temperature signal sent from the PCM as a CAN signal. The ambient temperature is displayed betwee ...

Blind Spot Monitoring (Bsm) Off Indicator Light
Purpose The BSM OFF indicator light informs the driver that the Blind Spot Monitoring (BSM) system is turned off or there is a malfunction in the system. Function The instrument cluster illuminates the BSM OFF indicator light based on the BSM system off signal sent via a CA ...