F300-HD_Engine-EC-Emission_Control_Systems-Part1
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DAIHATSU
F300
EMISSION CONTROL SYSTEMS E
[HD-C Engine] PURPOSE OF SYSTEM EO- 2 COMPONENT LAYOUT & SCHEMATIC
DIAGRAM EC- 3 Pos|T|vE cnANKcAsE vEN'r|LAT|oN
(Pcv) Ec- 4 FUEL EM|ss|oN
coNTno|_ svsrem Ec-10 [HD-E Engine] PURPOSE OF SYSTEMS EC-13 PGSITIVE CRANKCASE VENTILATION
SYSTEM (PCV) EC-14 coMPoNEN'r LAYOUT &
DIAGRAM Ec-15 FUEL EvAPoRA1'|vE Euusslon coN'rRo|.
(EVAP) sYs'rEM Ec-16 THROTTLE POSITIONER (TP)
SYSTEM EC-18 THREE-WAY CATALYST (TW C)
SYSTEM EO-19
WN88-ECXIJ1
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[HD-C Engine] PURPOSE OF SYSTEM
System Abbreviation PURPOSE
Positive crank case ventilation PCV zggzzrggeegmgg gases mm being released
Spark delay system
Redunes HC and NOx.
Choke breaker system
Reduces HC and CO.
Throttle positioner system
Reduces HC and CO.
Fuel evaporative emission control system
Reduces HC.
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COMPONENT LAYOUT & SCHEMATIC DIAGRAM
Distributor
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AIT Cleaflef
Choke breaker
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Vacuum motor
Charccai canister (GCC specifications only)
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POSITIVE CRANKCASE VENTILATION (PCV)
To combat with air-pollution problems, the engine is equipped with a sealed type positive crankcase ventila- tion system in order to prevent blow-by gases generated inside the crankcase from being released into the atmosphere. The blow-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 cyiinder 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 there 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 ofthe throttle valve and are sucked into the combustion chamber.
- Crankcase gas Fresh air
HD-C engine
INSPECTION OF PCV HOSE & CONNECTION
Ji?
Visual inspection of hoses and connection 3 in. Check the hoses for improper connections, cracks, leak or V damage. Replace or repair any part which exhibits defects.
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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 of the WV 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 - -111
C) © r Main diaphragm chamber
© r ' fr A T 5218"* 2; ff
2. inspection of
(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 VW. (2) Blow your breath into the distributor side (side A).
Ensure that there is restriction. If no restriction exists, replace the VTV. A
B
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CHOKE BREAKER SYSTEM
This system opens the choke valve during a period immediate- iy 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 first stage of the choke breaker diaphragm. Consequently, the choke valve is opened slightly. 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 of the choke breaker diaphragm via the TVSV. As a result, the choke valve opens further, thereby preventing the air-to- fuel ratio from becoming too rich.
Swnching Temperature of TVSV
nect the vacuum hose from choke breaker diaphragm and check that the choke linkage does not move. (3) Reconnect the vacuum hose to diaphragm B.
(1) Disconnect the vacuum hose from the choke breaker
diaphragm A and check linkage moves.
2. Inspection of jet and diaphragm A Jet , (1) Disconnect the vacuum hose from the choke breaker /
dianhraom A and check linkaoe moves. H mem if”
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that the choke linkage moves within the specified time after reconnecting the hose. Specified 'Fmez 1 - 5 seoonds
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3. Inspection of TVSV and diaphragm B with warm engine
(1) After warming up the engine, disconnect the vacuum hose from diaphragm B and check that the choke linkage returns. (2) Reconnect the vacuum hose to diaphragm B.
If no problem is found with this inspection, the system is okay; otherwise inspect each part.
Unit inspection of choke breaker 1. Inspection of jet
(1) Check the jet by blowing air from each side. (2) Ensure that there is no restriction if the air blows form the
gas filter side.
2. Inspection of choke breaker diaphragms
(1) Check that choke linkage moves in accordance with ap
plied vacuum.
3. Inspection of TVSV
(1) Drain the cooling water from radiator into a suitable con
tainer. (2) Disconnect the vacuum hose from the TVSV, and remove
the TVSV. NOTE: Be very careful not to damage the by hitting it to the
by-pass pipe.
(3) Cool the thermosensing section to below 12°C
(54°F), and check that air flows from pipe M to pipe J.
5 5 Gas filter side
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(4) Heat the TVSV more than 30°C (86°F), and check that air More than 30°C ;
flows from pipe M to pipe K. T
THROTTLE POSITIONER (TP) SYSTEM
Th,-Owe Vapuumlransmitting
Inspection of throttle positioner system $541 1. Warm up the engine. V 2. Disconnect the vacuum hose from the throttle oositioner. , " 7
3. Check that touch revolution speed is set.
5. Hold the engine revolution speed at about 2500 rpm at least five seconds by opening the throttle valve. Then, release the throttle lever. Check that the time required for the engine revolution speed to drop from 1500 rpm to 1200 rpm con- forms tothe specified value.
Specified Time: 0.5 - 5 seconds If the time will not conform to the specification, check the
direction of the Then, proceed to check the VTV.
EC-8
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Inspection of VTV 1. Remove the VTV. Blow your breath into the VTV from the car
buretor 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 from the throttle positioner side
(side A). Ensure that there is restriction. If no restriction exists, replace the VTV.
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FUEL EVAPQRATIVE 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 increases 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 charcoal 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 ofthe carburetor is sent into the charcoal canister when the BVSV exceeds the set temperature (65°C, 149°F).
_ Carburetor float chamber
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Flow of purge air _ _ _ - --> Flow of fuel vapor
1. Visual inspection of fuel vapor line and connections nemmpfpe
Check the line and connections for loose connections, kinks Main-pipe or damage. f---~
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*_ _ 2. Visual inspection of fuel tank l if cheek me fuel fenk fer deformation, creeks ef fuel leakage. *
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(t 1 l (' _
3. Visual inspection of fuel filler cap
Inspection of fuel vapor lines, fuel tank & filler cap emiss1°n.p1pe
Check the cap and gasket for damage or deformation.
EC-10
