Mazda X-5. Manual - part 34

CONTROL SYSTEM 

01–40–9

01–40

ENGINE CONTROL SYSTEM RELATION CHART [LF]

E5U014000000N06

×: Applicable

Item

Input device

Neutral switch (MT)

×

×

×

×

×

×

CPP switch (MT)

×

×

×

×

×

ECT sensor

×

×

×

×

×

×

×

×

×

×

IAT sensor

×

×

×

×

×

×

×

×

CKP sensor

×

×

×

×

×

×

×

×

×

×

×

CMP sensor

×

×

×

TP sensor No.1, No.2

×

×

×

×

×

×

×

×

×

×

APP sensor No.1, No.2

×

×

×

×

MAF sensor

×

×

×

×

×

×

×

Front HO2S

×

×

Rear HO2S

×

MAP sensor

×

×

×

×

×

BARO sensor (Built into PCM)

×

×

×

×

×

KS

×

Ignition switch

×

×

×

×

TR switch (AT)

×

×

×

×

×

×

Brake switch No.1, No.2

×

×

×

×

A/C amplifier

×

×

×

×

×

Refrigerant pressure switch (high, 
low)

×

×

×

×

×

Refrigerant pressure switch (middle)

×

×

×

Cruise control switch

×

PSP switch

×

Vehicle speed signal

×

×

×

×

×

×

Instrument cluster (Immobilizer 
related information)

×

Instrument cluster

×

DSC HU/CM

×

ABS HU/CM or DSC HU/CM

×

Generator (Terminal P: stator coil)

×

×

×

Battery

×

×

×

×

×

×

TCM (AT)

×

×

×

MAIN RELA

Y CONTR

OL

DRIVE-BY

-WIRE CONTR

OL

V

ARIABLE INT

AKE AIR CONTR

OL

V

ARIABLE V

AL

VE TIMING 

CONTR

OL

FUEL INJECTION CONTR

OL

FUEL PUMP CONTR

OL

ESA CONTR

OL

EV

APORA

TIVE PURGE CONTR

OL

EGR CONTR

OL

HO2S HEA

TER CONTR

OL

A/C CUT

-OFF CONTR

OL

ELECTRICAL F

AN CONTR

OL

ST

AR

TER CUT

-OFF CONTR

OL

GENERA

T

OR CONTR

OL

CAN

CONTROL SYSTEM 

01–40–10

End Of Sie

Output device

Main relay

×

Fuel pump relay

×

A/C relay

×

Cooling fan relay No.1

×

Cooling fan relay No.2

×

Cooling fan relay No.3

×

Starter relay

×

Purge solenoid valve

×

EGR valve

×

Variable intake air solenoid valve

×

Throttle valve actuator

×

Front HO2S heater

×

Rear HO2S heater

×

OCV

×

TCM (AT)

×

Fuel injector

×

Ignition coil

×

Generator (Terminal D: field coil)

×

Instrument cluster

×

ABS HU/CM or DSC HU/CM

×

Keyless control module

×

Item

MAIN RELA

Y CONTR

OL

DRIVE-BY

-WIRE CONTR

OL

V

ARIABLE INT

AKE AIR CONTR

OL

V

ARIABLE V

AL

VE TIMING 

CONTR

OL

FUEL INJECTION CONTR

OL

FUEL PUMP CONTR

OL

ESA CONTR

OL

EV

APORA

TIVE PURGE CONTR

OL

EGR CONTR

OL

HO2S HEA

TER CONTR

OL

A/C CUT

-OFF CONTR

OL

ELECTRICAL F

AN CONTR

OL

ST

AR

TER CUT

-OFF CONTR

OL

GENERA

T

OR CONTR

OL

CAN

CONTROL SYSTEM 

01–40–11

01–40

MAIN RELAY CONTROL OUTLINE [LF]

E5U014000000N56

• When the ignition switch is turned to the ON position, the main relay turns on.

• When the ignition switch is turned from on to off, the main relay turns on for a few minutes to activate the fully-

closed throttle learning function of the drive-by-wire control, the after-cleaning function of the electrical fan 
control, and EVAP system leak detection function of the EVAP control system.

End Of Sie

MAIN RELAY CONTROL BLOCK DIAGRAM [LF]

E5U014000000N57

• The PCM controls the main relay on/off, based on commands from the ignition switch or the controls.

End Of Sie

MAIN RELAY CONTROL OPERATION [LF]

E5U014000000N58

• When the ignition switch is turned to the ON position, the main relay turns on and power is supplied to sensors 

and devices.

• When the ignition switch is turned from on to off, a main relay on command signal is received the main relay 

turns on and the following actions take place:

1. Throttle valve control: Fully closed throttle learning function (See 01–40–13 DRIVE-BY-WIRE CONTROL 

OPERATION [LF].)

2. After-cooling function of the electrical fan control (See 01–40–34 ELECTRICAL FAN CONTROL 

OPERATION [LF].)

3. EVAP system leak detection function of the EVAP control system (See 01–16–7 EVAPORATIVE 

EMISSION (EVAP) CONTROL SYSTEM OUTLINE [LF].)

• When the on request signal from the controls stop, the main relay turns off.

End Of Sie

DRIVE-BY-WIRE CONTROL OUTLINE [LF]

E5U014000000N59

• The drive-by-wire control calculates the optimum target throttle valve opening angle at all ranges of engine 

speeds and controls the throttle valve actuator.

• The drive-by-wire control includes idle speed control, accelerator control, traction control and cruise control.

Control List

End Of Sie

PCM

MAIN RELAY

IGNITION SWITCH

E5U140ZT5301

Control name

Control Outline

Idle speed control

• Controls the throttle valve opening angle during idling so that the idle speed is at the 

target idle speed.

Accelerator control

• Controls the throttle valve opening angle according to the amount of AP depression. 

Has a fully-closed throttle learning function for consistent setting of the optimum 
throttle opening angle according to changes due to age deterioration.

Traction control

• Controls the throttle valve opening angle by torque up/down request signals from the 

DSC HU/CM and TCM (AT).

Cruise control

• Sets the vehicle speed by operation of the cruise control switch and controls the 

throttle valve opening angle so that it becomes close to the set vehicle speed.

CONTROL SYSTEM 

01–40–12

DRIVE-BY-WIRE CONTROL BLOCK DIAGRAM [LF]

E5U014000000N64

• The PCM calculates the throttle valve opening angle matching the engine operation conditions from the 

following input signals and sends a duty signal to the throttle valve actuator.

End Of Sie

REFRIGERANT 

PRESSURE SWITCH 

(MIDDLE)

MAF SENSOR

IAT SENSOR

MAP SENSOR

CKP SENSOR

ECT SENSOR

A/C AMPLIFER

REFRIGERANT 

PRESSURE SWITCH

(HIGH, LOW )

GENERATOR

(TERMINAL P: STATOR COIL)

BARO SENSOR

NEUTRAL SWITCH (MT)

CPP SWITCH (MT)

BRAKE SWITCH 

NO.1, NO.2

VEHICLE SPEED SIGNAL

PCM

TR SWITCH (AT)

TROTTLE VALVE 

ACTUATOR

TP SENSOR NO.1, NO.2

APP SENSOR NO.1, NO.2

TCM (AT)

CRUISE CONTROL SWITCH

IGNITION SWITCH

DSC HU/CM

PSP SWITCH

E5U140ZT5002