Page 3369 of 4770

EC03G±04
S05568
Cap
Filter
B06540
Vacuum Gauge
3±Way Connector
A07370
SST
E1
TE1
B06541
HOTHigh Vacuum at 2,500 rpm
Port R
Disconnect
EC±12
± EMISSION CONTROL (5S±FE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
1410 Author: Date:
INSPECTION
1. INSPECT EGR SYSTEM
(a) Inspect and clean the filter in the EGR vacuum modulator.
(1) Remove the cap and filter.
(2) Check the filter for contamination or damage.
(3) Using compressed air, clean the filter.
(4) Reinstall the filter and cap.
HINT:
Install the filter with the coarser surface facing the atmospheric
side (outward).
(b) Using a 3±way connector, connect a vacuum gauge to the
hose between the EGR valve and VSV.
(c) Inspect seating of the EGR valve.
Start the engine and check that the engine starts and runs
at idle.
(d) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843±18020
(e) Inspect the VSV operation with the cold engine.
(1) The engine coolant temperature should be below
55°C (131°F).
(2) Check that the vacuum gauge indicates zero at
2,500 rpm.
(f) Inspect the operation of the VSV and EGR vacuum modu-
lator with the hot engine.
(1) Warm up the engine to above 60°C (140°F).
(2) Check that the vacuum gauge indicates low vacu-
um at 2,500 rpm.
(3) Disconnect the vacuum hose port R of the EGR vac-
uum modulator and connect port R directly to the in-
take manifold with another hose.
(4) Check that the vacuum gauge indicates high vacu-
um at 2,500 rpm.
Page 3370 of 4770

B06539
Disconnect
S05567
Air Engine Stopped
S05566
Engine at
2,500 rpm
Air
± EMISSION CONTROL (5S±FE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
EC±13
1411 Author: Date:
HINT:
As a large amount of exhaust gas enters, the engine will misfire
slightly.
(g) Remove the vacuum gauge, and reconnect the vacuum
hoses to the proper locations.
(h) Inspect the EGR valve.
(1) Apply vacuum directly to the EGR valve with the en-
gine idling.
(2) Check that the engine runs rough or dies.
(3) Reconnect the vacuum hoses to the proper loca-
tions.
HINT:
As exhaust gas is increasingly recirculated, the engine will start
to misfire.
(i) Remove the SST from the DLC1.
SST 09843±18020
2. INSPECT EGR VACUUM MODULATOR
(a) Disconnect the vacuum hoses from ports P, Q and R of
the EGR vacuum modulator.
(b) Block ports P and R with your finger.
(c) Blow air into port Q, and check that the air passes through
to the air filter side freely.
(d) Start the engine, and maintain speed at 2,500 rpm.
(e) Repeat the above test. Check that there is a strong resis-
tance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.
Page 3371 of 4770
S05559
EC±14
± EMISSION CONTROL (5S±FE)EXHAUST GAS RECIRCULATION (EGR) SYSTEM
1412 Author: Date:
3. INSPECT EGR VALVE
(a) Remove the EGR valve.
(1) Disconnect the 2 vacuum hoses from the EGR
valve.
(2) Remove the 2 bolts, 2 nuts, EGR valve and 2 gas-
kets.
(b) Check the EGR valve for sticking and heavy carbon de-
posits.
If a problem is found, replace the valve.
(c) Reinstall the EGR valve.
(1) Temporarily 2 new gasket and the EGR valve with
the 2 nuts and 2 bolts.
(2) Tighten the nuts.
Torque: 13.3 N´m (136 kgf´cm, 10 ft´lbf)
(3) Tighten the bolts.
Torque: 10 N´m (102 kgf´cm, 7 ft´lbf)
(4) Connect the 2 vacuum hoses to the EGR valve.
4. INSPECT VSV FOR EGR (See page SF±43)
Page 3372 of 4770
EC03H±03
± EMISSION CONTROL (5S±FE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±15
1413 Author: Date:
THREE±WAY CATALYTIC CONVERTER (TWC) SYSTEM
ON±VEHICLE INSPECTION
1. INSPECT EXHAUST PIPE ASSEMBLY
(a) Check the connections for looseness or damage.
(b) Check the clamps for weakness, cracks or damage.
2. INSPECT REAR TWC
Check for dents or damage.
If any part of the protector is damaged or dented to the extent that it contacts the TWC, repair or replace
it.
3. INSPECT REAR TWC HEAT INSULATOR
(a) Check the heat insulator for damage.
(b) Check for adequate clearance between the catalytic converter and heat insulator.
Page 3373 of 4770
EC03I±04
B06537
Front TWC (California)
Exhaust Manifold
(Front TWC)
No.3 Exhaust
Manifold Heat
Insulator
No.2 Exhaust
Manifold Stay
A/F Sensor GasketA/F Sensor Connector
Gasket Clampx 6
N´m (kgf´cm, ft´lbf)
Non±reusable part
49 (500, 36)
44 (450, 32)
62 (630,46)
: Specified torque
No.1 Exhaust
Manifold Stay
No.1 Exhaust Manifold
Heat Insulator
No.2 Exhaust Manifold
Heat Insulator
(TMC Made)
(TMMK Made)
EC±16± EMISSION CONTROL (5S±FE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
1414 Author: Date:
COMPONENTS
Page 3374 of 4770
B06538
N´m (kgf´cm, ft´lbf)
Non±reusable part
TWC (Except California)
Rear TWC (California)
Gasket
BracketTWC (Except California)
Rear TWC (California)
Front Exhaust Pipe Gasket
Stay
62 (630, 46)
56 (570, 41)
: Specified torque
± EMISSION CONTROL (5S±FE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±17
1415 Author: Date:
Page 3375 of 4770
EC01U±03
± EMISSION CONTROL (1MZ±FE)EMISSION CONTROL SYSTEM
EC±1
1416 Author: Date:
EMISSION CONTROL SYSTEM
PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3), (4), (5) and (6)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evap-
orated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in these table.
SystemAbbreviationFunction
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Warm Up Three±Way Catalytic Converter
(5) Three±Way Catalytic Converter
(6) Sequential Multiport Fuel Injection*PCV
EVAP
EGR
WU±TWC
TWC
SFIReduces HC
Reduces evaporated HC
Reduces NOx
Reduces HC, CO and NOx
Reduces HC, CO and NOx
Injects a precisely timed, optimum amount of fuel for reduced
exhaust emissions
Remark: * For inspection and repair of the SFI system, refer to the SF section of this manual.
Page 3376 of 4770
EC01V±03
B06386
VSV for EGREGR Valve
Vent LineCharcoal Canister
Fuel Tank
EVAP Line
Air Drain Hose
Filler Pipe
Air Inlet Line
Purge Line
Cut Off Valve
Fill Check Valve
VSV for EVAP
VCVVacuum Surge Tank
EVAP Service Port
Vapor Pressure Sensor
Fuel Tank Cap
VSV for Vapor Pressure Sensor
Vacuum Surge Tank EC±2
± EMISSION CONTROL (1MZ±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
1417 Author: Date:
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION