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:

Drive Belt
Purpose, Function The drive belt transmits rotation force of the crankshaft pulley to the pulley for the auxiliary parts. Construction The drive belt is installed to the front of the engine. A V-ribbed belt has been adopted for the drive belt. The wat ...

Auxiliary Jack/Usb Port Inspection
Auxiliary jack inspection 1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Upper console. b. Auxiliary jack/USB port. 3. Connect a commercially-available plug to the external input unit. 4. Verify that the continuity between the external input unit terminal ...

Passenger Compartment Temperature Sensor [Full Auto Air Conditioner]
Purpose The passenger compartment temperature sensor detects the cabin temperature. Function The passenger compartment temperature sensor converts the detected temperature to an electric signal. Construction A thermistor-type passenger compartment temperature sens ...