EC02E-01

-EMISSION CONTROL EMISSION CONTROL SYSTEMEC-1

700Author: Date:

2002 ECHO (RM884U)

EMISSION CONTROL SYSTEMPURPOSEThe emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from theengine ((3) and (4)), to prevent the atmospheric release of blow-by gas-containing HC (1) and evaporatedfuel containing HC being released from the fuel tank (2).The function of each system is shown in these table.

System Abbreviation Function

(1) Positive Crankcase Ventilation(2) Evaporative Emission Control(3) Three-way Catalytic Converter(4) Sequential Multiport Fuel Injection*

PCVEVAPTWCSFI

Reduces HCReduces evaporated HCReduces HC, CO and NOxInjects a precisely timed, optimum amount of fuel for reducedexhaust emissions

Remark: *For inspection and repair of the SFI system, refer to the SF section of this manual.

EC0E6-01

B04812

Gasket

B06544

VacuumGauge

D08002

TOYOTA Hand-held Tester

B09807

-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEMEC-5

704Author: Date:

2002 ECHO (RM884U)

INSPECTION1. INSPECT LINES AND CONNECTORSVisually check for loose connections, sharp bends or damage.2. INSPECT FUEL TANK FILLER PIPEVisually check for deformation, cracks or fuel leakage.

3. INSPECT FUEL TANK CAPVisually check if the cap and/or gasket are deformed or dam-aged.If necessary, repair or replace the cap.

4. INSPECT EVAP SYSTEM LINE(a) Warm up the engine and stop the engine.

Allow the engine to warm up to normal operating tempera-ture.

(b) Install a vacuum gauge (EVAP control system test equip-ment vacuum gauge) to the EVAP service port on thepurge line.

(c) TOYOTA hand-held tester:Forced driving of the VSV for the EVAP.(1) Connect a TOYOTA hand-held tester to the DLC3.(2) Start the engine.(3) Push the TOYOTA hand-held tester main switch

ON.(4) Use the ACTIVE TEST mode on the TOYOTA

hand-held tester to operate the VSV for the EVAP.

(d) If you have no TOYOTA hand-held tester:Forced driving of the VSV for the EVAP.(1) Disconnect the VSV connector for the EVAP.(2) Connect the positive (+) and negative (-) leads from

the battery to the VSV terminals for the EVAP.(3) Start the engine.

B06545

D08002

EC-6-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

705Author: Date:

2002 ECHO (RM884U)

(e) Check the vacuum at idle.Vacuum:Maintain at 0.368 - 19.713 in.Hg (5 - 268 in.Aq) for over5 seconds

HINT:If the vacuum does not change, you can conclude that the hoseconnecting the VSV to the service port has come loose or isblocked, or the VSV is malfunctioning.(f) If you have TOYOTA hand-held tester:

Conclude forced driving of the VSV for the EVAP.(1) Stop the engine.(2) Disconnect the TOYOTA hand-held tester from the

DLC3.(g) If you have no TOYOTA hand-held tester:

Conclude forced driving of the VSV for the EVAP.(1) Stop the engine.(2) Disconnect the positive (+) and negative (-) leads

from the battery, and from the VSV terminals for theEVAP.

(3) Connect the VSV connector for the EVAP.(h) Disconnect the vacuum gauge from the EVAP service

port on the purge line.(i) Connect a pressure gauge to the EVAP service port on

the purge line.

(j) If you have TOYOTA hand-held tester:Force driving of the VSV for canister closed valve (CCV)(1) Connect a TOYOTA hand-held tester to the DLC3.(2) Turn the ignition switch ON.(3) Push the TOYOTA hand-held tester main switch

ON.(4) Use the ACTIVE TEST mode on the TOYOTA

hand-held tester to operate the VSV for canisterclosed valve (CCV).

NOTICE:Do not start the engine.HINT:If the check is not completed within 10 minutes, the forced closeof VSV for canister closed valve (CCV) will be reset.

B09372

Hose ClipperAir Drain Hose

B06546

PressureGauge

Pressure

B06547

Fuel Tank Cap

-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEMEC-7

706Author: Date:

2002 ECHO (RM884U)

(k) IF you have no TOYOTA hand-held tester:Close off the air drain hose at the marked position of thecanister with a hose clipper or similar instrument.

(l) Check the pressure.(1) Add the pressure (13.5 - 15.5 in.Aq) from the EVAP

service port.Pressure:2 minutes after the pressure is added, the gaugeshould be over 7.7 - 8.8 in.Aq.

HINT:If you cant add pressure, you can conclude that the hose con-necting the VSV for EVAP-canister-fuel tank has slipped off orthe VSV is open.

(2) Check if the pressure decreases when the fuel tankcap is removed while adding pressure.

HINT:If the pressure does not decrease when the filler cap is re-moved, then you can conclude that the hose connecting theservice port to the fuel tank is blocked, etc.(m) If you have TOYOTA hand-held tester:

Conclude forced driving of he VSV for canister closedvalve (CCV).(1) Turn ignition switch OFF.(2) Disconnect the TOYOTA hand-held tester from the

DLC3.(n) If you have no TOYOTA hand-held tester:

Remove the hose clipper or similar instrument from the airdrain hose.

(o) Disconnect the pressure gauge from the EVAP serviceport on the purge line.

B09373

EVAP Line HoseA

A

B09374

Air

EVAP Line Hose

Purge Line Hose

B09375

AirAir Inlet Line Hose

EC-8-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

707Author: Date:

2002 ECHO (RM884U)

5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLERPIPE

(a) Disconnect the EVAP line hose from the charcoal canis-ter.(1) Pinch portion A.(2) Pull out the connector.

(b) Pressurize and make the internal pressure in the fuel tank4 kPa (41 gf/cm2, 0.58 psi).

(c) Check that the internal pressure of the fuel tank can beheld for 1 minute.

(d) Check the connected portions of each hose and pipe.(e) Check the installed parts on the fuel tank.If there is no abnormality, replace the fuel tank and filler pipe.(f) Reconnect the EVAP line hose to the charcoal canister.

6. INSPECT FUEL CUTOFF VALVE AND FILL CHECKVALVE

(a) Disconnect the purge line hose and EVAP line hose fromthe charcoal canister.

(b) Plug the cap to the air drain hose.(c) Pressurize 4 kPa (41 gf/cm2, 0.58 psi) to the purge port

and check that there is ventilation through the EVAP linehose.

HINT:In the condition that the fuel is full, as the float value of the fillcheck valve is closed and has no ventilation, it is necessary tocheck the fuel amount (volume).(d) Check if there is anything stuck in the vent line hose and

EVAP line hose.If there is nothing stuck in them, replace the fuel cut off valveand fill check valve.(e) Reconnect the purge line hose and EVAP line hose to the

charcoal canister.

7. CHECK AIR INLET LINE(a) Disconnect the air inlet line hose from the charcoal canis-

ter.(b) Check that there is ventilation in the air inlet line.(c) Reconnect the air inlet line hose to the charcoal canister.

B09376

Pinch

A

Pinch

B09377

B09378

Air

Purge PortVent Port

Air Drain Port

Cap

EVAP Port

B09379Air Inlet Port

Air Drain PortPurge Port

EVAP PortAir

-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEMEC-9

708Author: Date:

2002 ECHO (RM884U)

8. REMOVE CHARCOAL CANISTER ASSEMBLY(a) Disconnect the VSV connector.(b) Disconnect the purge line hose, EVAP line hose and air

inlet line hose from the charcoal canister.(c) Disconnect the vent line hose from charcoal canister.

(1) Push the connector deep inside.(2) Pinch portion A.(3) Pull out the connector.

(d) Remove the 3 nuts and charcoal canister assembly.

9. INSPECT CHARCOAL CANISTER(a) Visually check the charcoal canister for cracks or dam-

age.

(b) Inspect the charcoal canister operation.(1) Plug the vent port with a cap.(2) While holding the purge port closed, blow air (1.76

kPa, 18 gf/cm2, 0.26 psi) into the EVAP port andcheck that air flows from the air drain port.

(3) While holding the purge port and the air drain portclosed, blow air (1.76 kPa, 18 gf/cm2, 0.26 psi) intothe EVAP port and check that air does not flow fromthe air inlet port.

B09380

Air Inlet Port Purge Port

Vacuum

B09381

Air Inlet PortPurge Port

EVAP PortVacuum

EC-10-EMISSION CONTROL EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

709Author: Date:

2002 ECHO (RM884U)

(4) Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg)to the purge port, check that the vacuum does notdecrease when the air inlet port is closed, andcheck that the vacuum decreases when the air inletport is released.

(5) While holding the air inlet port closed, apply vacuum(3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP portand check that air flows into the purge port.

If a problem is found, replace the charcoal canister.(6) Remove the cap from the vent port.

10. INSPECT VSV FOR EVAP(See page SF-50 )

11. INSPECT VSV FOR CANISTER CLOSED VALVE (CCV)(See page SF-52 )

12. INSPECT VAPOR PRESSURE SENSOR(See page SF-56 )

13. REINSTALL CHARCOAL CANISTER ASSEMBLY

EC0E5-01

P11834

Clean Hose

Cylinder Head Side

P11831

Clean Hose

Intake Manifold Side

B00412

EC-4-EMISSION CONTROL POSITIVE CRANKCASE VENTILATION (PCV)

SYSTEM

703Author: Date:

2002 ECHO (RM884U)

POSITIVE CRANKCASEVENTILATION (PCV) SYSTEMINSPECTION1. REMOVE PCV VALVE(a) Remove the No. 2 cylinder head cover.(b) Disconnect the PCV hose from the PCV valve.(c) Remove the PCV valve.

2. INSTALL CLEAN HOSE TO PCV VALVE3. INSPECT PCV VALVE OPERATION(a) Blow air into the cylinder head side, and check that air

passes through easily.CAUTION:Do not suck air through the valve. Petroleum substancesinside the valve are harmful.

(b) Blow air into the intake manifold side, and check that airpasses through with difficulty.

If operation is not as specified, replace the PCV valve.4. REMOVE CLEAN HOSE FROM PCV VALVE5. REINSTALL PCV VALVE(a) Install the PCV valve to the cylinder head cover.

Torque: 27 Nm (275 kgfcm, 20 ftlbf)(b) Connect the PCV hose to the PCV valve.

6. VISUALLY INSPECT HOSES, CONNECTIONS ANDGASKETS

Check for cracks, leaks or damage.

EC02G-07

B09796

CharcoalCanister

Vapor Pressure Sensor

VSV for EVAP

Heated Oxygen Sensor(Bank 1 Sensor 1)

Heated Oxygen Sensor(Bank 1 Sensor 2)

Fuel Tank

Purge Line

TWC

EVAP ServisePort

Fuel Tank Cap

EVAP Line

Vent Line

Air Inlet Line

Air Drain Hose

Filler PipeVSV for ChanisterClosed Valve (CCV)

-EMISSION CONTROL PARTS LAYOUT AND SCHEMATIC DRAWINGEC-3

702Author: Date:

2002 ECHO (RM884U)

DRAWING

EC02F-08

B09371

VSV for EVAPEVAP Service Port

Charcoal Canister

EVAP Line

Vent Line

Purge Line

Air Inlet Line

Air Drain Hose

Vapor Pressure Sensor

EC-2-EMISSION CONTROL PARTS LAYOUT AND SCHEMATIC DRAWING

701Author: Date:

2002 ECHO (RM884U)

PARTS LAYOUT AND SCHEMATIC DRAWINGLOCATION

EC02K-05

-EMISSION CONTROL THREE-WAY CATALYTIC CONVERTER (TWC) SYSTEM

EC-1 1

710Author: Date:

2002 ECHO (RM884U)

THREE-W AY CATALYTIC CONVERTER (TWC) SYSTEMINSPECTION1. CHECK TWC FOR DENTS OR DAMAGEIf any port of the heat insulatr is damaged or dented to the extent that it contacts the three-way catalyticconverter, repair or replace it.2. CHECK EXHAUST PIPE CONNECTIONS FOR

LOOSENESS OR DAMAGE3. CHECK EXHAUST PIPE CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE4. CHECK HEAT INSULATOR FOR DAMAGE5. CHECK FOR ADEQUATE CLEARANCE BETWEEN EXHAUST SYSTEM AND HEAT INSULATOR

ON THE BODY