Pcm Function [Lf]; Function List; Pcm Construction/Operation [Lf]; Structure - Mazda 2006 MX-5 Service Highlights

PCM FUNCTION [LF]

Function List

• The control descriptions are as shown below.
Function
Main relay control
Drive-by-wire control
Drive-by-wire relay control
Variable intake air control
Variable valve timing control
Fuel injection control
Fuel pump control
ESA control
Evaporative purge control
EGR control
HO2S heater control
A/C cut-off control
Electrical fan control
Starter cut-off control
Generator control
CAN
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PCM CONSTRUCTION/OPERATION [LF]

Structure

• A 120-pin (two-block) PCM connector has been adopted.
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CONTROL SYSTEM
When the ignition switch is turned to the ON position, the main relay turns on.
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.
Supplies power to the drive-by-wire control.
Switches energization of the variable shutter valve actuator according to engine speed to
enhance the inertia charging effect.
Changes the intake valve timing according to engine operation conditions to improve engine
output, fuel economy and exhaust emission performance.
Performs optimum fuel injection according to engine operation conditions.
Performs energization of the fuel pump relay only when the engine is running (operates fuel
pump) to improve stability and durability.
Controls ignition to optimum timing according to engine operation conditions.
An appropriate amount of evaporative gas is fed into the dynamic chamber by the driving of the
purge solenoid valve according to the engine operation conditions to ensure driveability and
prevent release of fuel vapor gas into the atmosphere.
Adjusts the EGR to the optimum opening angle according to engine operation conditions.
Based on the control of the front and rear HO2S heater, a stabilized oxygen concentration is
detected even at low exhaust gas temperature and feedback control of fuel injection even
during cold engine start is made possible for improved cold temperature emission performance.
The current application (energize/non-energize) to the A/C relay (magnetic clutch) is controlled
according to the engine operation conditions to prevent deterioration of engine performance,
damage to the engine, and deterioration of the A/C function.
Through cooling of the radiator and condenser by operation of the cooling fan according to
vehicle conditions, engine reliability and cooling performance have been improved.
Theft deterrence has been improved by controlling energization to the starter relay according to
an engine stop request signal from the immobilizer system.
Generator output is optimized according to the engine operation and electrical load conditions,
ensuring idling stability and anti-load performance.
Used for communication with the EHPAS control module, ABS HU/CM, instrument cluster and
DLC-2.
Description
E5U014018880N01
01–40
E5U014018880N02
01–40–39