Eec-V Component Descriptions - Mazda B-Series 1997 Workshop Manual

FT
OUTLINE
EEC-V COMPONENT DESCRIPTIONS
COMPONENT
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FUNCTION
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REMARK
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Air cleaner
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Filters air entering throttle body.
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#C cycling switch
Sends a voltage s~gnal input to PCM when
N C
IS
requested.
A/C pressure switch
Brake OnIOff (BOO)
switch
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Camshaft position
sensor (CMP)
Carbon canister
Clutch pedal position
(CPP) switch
(MK only)
Prevents N C pressure from rising to a level Uses normally closed switch.
that would open the AIC high pressure relief Open switch contacts when AIC head pressure is
valve. extremely high.
Sends a battery voltage signal to PCM when
1
If all stoplamp bulbs are open, a high voltage is
depressing brake pedal.
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present at PCM due to a pull-up resistor in PCM.
PCM adjusts or controls the following: This provides fail safe function in event circuit to
1. Maintains idle speed with brake applied BOO switch has failed.
Electronic vacuum
regulator (EVR)
solenoid
2. N C compressor ON/OFF
3. Disengages torque converter clutch
p - p p - - - - - p
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Detects position of camshaft and sends
signal to PCM.
PCM uses for synchronizing firing of
sequential fuel injectors.
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Provides storage of fuel vapors.
Detects a load on engine.
PCM uses load information in mass air flow
and fuel calculations.
Coast clutch solenoid
(ccs)
Crankshaft position
(CKP) sensor
Data link connector
@LC)
Differential pressure
EGR valve
Uses a Hall Device Type for 3.OU4.OL or a
Variable Reluctance type for 2.3L.
CMP identifies when #1 piston is at top dead
center of its compression stroke.
CMP for 3.OL is adjustable.
Contains activated carbon, which has the ability to
store fuel vapors and to purge stored fuel vapors.
Uses normally open switch.
One volt or less signal input at PCM indicates a
reduced engine load. 5 volts signal input at PCM
indicates engine load. On PJT model, jumper is
connected to connector.
Applies and releases coast clutch.
PCM outputs driver signals to solenoids.
Monitors trigger wheel to indicate crankshaft
position and speed information to PCM.
PCM uses this signal for ignition control.
Connector for scan tool or NGS tester.
Monitors differential pressure through two
Electronic pressure
control (EPC)
solenoid
Uses normally closed and ONJOFF style solenoid.
Solenoid is an electro-hydraulic actuator
combining a solenoid and regulator valve.
CKP is a magnetic transducer.
CKPs for all three engines are not adjustable.
Uses SAE defined J1962 data link connector.
Located left side of hood release lever.
Uses a ceramic capacitive type pressure
feedback EGR sensor
,
hoses referred to as down and upstream
(DPFE) pressure hoses and outputs voltage to PCM.
PCM uses signal to adjust EVR solenoid
duty cycle and achieve desired EGR flow.
Regulates vacuum supply to EGR valve.
!
As duty cycle increases, vacuum output also
PCM outputs a duty cycle to drive the EVR increases. With 0 percent duty cycle or no
solenoid. electrical signal applied, EVR solenoid allows
some vacuum to pass, but not enough to open
;
EGR valve.
Controls transmission line pressure used to
apply and release clutches and bands in
transmission.
PCM outputs driver signals to solenoid.
transducer.
Marks HI and REF signals on sensor housing for
identification (HI signal uses a larger diameter
hose).
Increases or decreases flow of exhaust gas
recirculation.
Uses normally closed and variable force style
solenoid. Solenoid is an electro-hydraulic actuator
combining a solenoid and regulator valve.
Produces resisting forces to main regulator and
line modulator circuits. If EPC solenoid is shorted
to ground, PCM outputs DTC for VSS.
Uses conventional vacuum-actuated valve.
At vacuum signal of 1.6 in-Hg (41 mm-Hg) or less,
spring force in EGR valve closes valve. Valve is
fully opened at about 4.5 in-Hg (114 mm-Hg).