F300-EC-Emission_Control_System-Part1
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DAIHATSU
F300
EMISSION CONTROL SYSTEM
PURPOSE OF SYSTEM
COMPONENT LAYOUT & SCHEMATIC DIAGFIAM EC- 3 POSITIVE CRANKCASE VENTILATION (PGV) EO- 4
FUEL EVAPORATIVE EMISSION CONTROL SYSTEM
(GCC specifications only)
[HD-E Engine]
PURPOSE OF SYSTEMS
COMPONENT LAYOUT 8| SCHEMATIC DIAGRAM
(General Specification) EG-14 (US Specification) EC-15 POSITIVE CRANKCASE VENTILATION SYSTEM (PGV) EC-16
FUEL EVAPORATIVE EMISSION CONTROL
(EVAP) SYSTEM EG-17 THROTTLE POSITIONEFI (T P) SYSTEM EC-21
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
(US Specifiwiion Only) THREE-WAY CATALYST (TWC) SYSTEM SST (Special Service Tools) TIGHTENING TORQUES
SERVICE SPECIFICATION
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EMISSION CONTROL SYSTEM
[HD-C Engine] PURPOSE OF SYSTEM
'W I I
System
Positive crank case ventilation
SD I Reduction of HC and NOx
Choke breaker System
Throttle positioner system
TP | Reduction of HC ana co
EVAP l Reduction oi evaporative HC emissicm
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7 EMISSION CONTROL SYSTEM
COMPONENT LAYOUT & SCHEIVIATIC DIAGRAM
fl I Hfii I h Charcoal camster
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To combat air-pollution probiems. the engine is equipped with a seated type positive crankcase ventilation system in order to prevent blow-by gases generated inside the crankoase from being released into the atmosphere. The biow-by gases generated inside the crankcase flow into the cylinder head side through the gas passages of the cylinder block. When the throttle valve opening degree is small. first the oil in the blow-by gas is separated by the oil separator provided at the cylinder head cover. Then, the blow-by gases flow from the carburetor heat insulator section to the intake manifold. Thus. the gases are sucked into the cylinder and burned again. At this time, fresh air flows from the upstream of the throttle valve into the cylinder head cover. The air flow rate is restricted by a jet located at the cylinder head cover, thus stabilizing the engine idling. When the throttle valve opening degree is great and/or a large amount of blow-by gases are generated, the blow-by gases flow through both the upstream and the downstream of the throttle valve and are sucked into the combustion chamber.
W
INSPECTION OF POV HOSE & CONNECTION | A_______ , '
Visual inspection of hoses and connection f Check the hoses for improper connections. cracks. leak or damage. 5! Replace or repair any part which exhibits defects.
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EMISSION CONTROL SYSTEN
FUEL EVAPORATIVE EMISSION CONTROL SYSTEM (GCC specifications only)
The fuel evaporative emission control system prevents the fuel evaporative emission generated inside the fuel tank or the float chamber of the carburetor from being discharged to the atmosphere. As the temperature rises, the pressure of the fuel evaporative emission generated in the fuel tank increase: while the engine is stopped. When this pressure rise exceeds a certain level, the check valve at the positive pressure side is raised and the evaporative emission is absorbed into the activated carbon in a charcoa canister. When the engine starts running, the check valve at the negative pressure side opens so that any evaporative emission stored in the canister may be sent to the combustion chamber to be reburnt there. On the other hand, the fuel evaporative emission generated in the float chamber of the carburetor is sen' into the charcoal canister when the BVSV exceeds the set temperature (65°C).
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Fuel tank Charcoal canister
3. Visual inspection of fuel filier cap 1 7* W
Check the cap and gasket for damage or deformation.
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EMISSION CONTROL SYSTEM
Inspection of charcoal canister (GCC speciiication only)
Disconnect the rubber hoses and remove the charcoal canister. NOTE: - Put a tag on each of the rubber hoses so that they may
be reconnected correctly to the original positions.
Visual inspection of charcoal canister case Visually inspect the charcoal canister case for cracks or damage.
Check of canister for restriction (1) With the pipe at the BVSV side plugged with your finger, appiy compressed air from the pipe at the fuel tank side. Ensure that air ieeks from the other pipe.
(2) Appty compressed air from the purge side. Ensure that
no air continuity exists. It the check results are unsatisfactory, replace the char- coal canister.
Cleaning of filter in canister Clean the filter by biowing compressed air of 294 kPa (3 kgi/cmz) into the tank pipe while hoiding the other upper canister pipe dosed. NOTE: - Do not attempt to wash the canister. - No activated carbon should come out during the test.
lnstaT1 the charcoal canister and reconnect the rubber hose.
EC-6
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. Insiection of outer vent valve 7
3. With the ignition key switch tumed OFF. blow air into the
outer vent valve. Ensure that air continuity exists. It no air continuity exists, check to see if any abnormality is present in the electric circuit of the outer vent valve. Then, replace the outer vent valve. as required. CAUTION:
o Never inhale the air during the continuity inspection.
4. Connect the rubber hose to the BVSV. Attach the hose
bands.
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Emlsslon QQQTRQQLSYSTEM f
SPARK DELAY SYSTEM
During an acceleration period, this system reduces the HC and NOx emissions generated during the transient period by retarding the ignition advance timing temporarily. This is accomplished by means ofthe VW which retards the application of a negative pressure being applied to the main diaphragm of the distributor vacuum advancer through the carburetor advance port.
Auxiliary diaphragm chamber H E
Unit inspection of spark delay system X/ ff' f' ' f 1, Remove the VTV from engine.
e
2. tnspection of VTV
(1) Blow your breath into the VTV carburetor side (side B).
Ensure that the air passes through without restriction. if significant restriction exists, replace the VTV. (2) Blow your breath into the VTV distibutcr side (side A),
Ensure that there is restriction. if no restriction exists, replace the A
B
3. instali the VTV to the engine.
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CHOKE BREAKER SYSTEM
This system opens the choke valve during a period immediately after starting so as to reduce the HC and CO emissions.
Operation During a period immediately after starting, negative pressure is applied gradually to the firsi stage of the choke breaker diaphragm. Consequently. the choke valve is opened siightly. When the water temperature is low, the atmosphere is applied to the second stage of the choke breaker diaphragm via the TVSV. Thus, the second diaphragm remains inoperative
When the temperature reaches a certain level as the cooling water temperature rises. the negative pressure of the intake manifold starts to be applied to the second stage ofthe choke breaker diaphragm via the TVSV. As a result, the choke valve opens further, thereby preventing the air-t0- fuel ratio from becoming too rich.
EMISSION CONTROL SYSTE!-7
Switching Temperature of TVSV
Above 25°C
Inspection of choke breaker system "
. 1. insnectinn nf TVSV wi" ' ' Choke mkage
_ inspection of TVSV with cold engine
(1) Start the engine. (2) With the coolant temperature below 15°C, disconnect the vacuum hose from choke breaker diaphragm B and check that the choke linkage does not move, (3) Re-connect the vacuum hose to diaphragm B.
2. Inspection of iet and diaphragm A
(1) Disconnect the vacuum hose from the choke breaker
diaphragm A and check linkage moves. (2) Reconnect the vacuum hose to diaphragm A and check that the choke iinkage moves within the specified time after reconnecting the hose. Specitied 1 - 5 seconds
Diaphragm A
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