TOYOTA CAMRY 1999 Service Repair Manual

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.

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

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:

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.

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

EC01W±03
B06721
VSV for Vapor
Pressure Sensor Vapor Pressure
SensorVacuum Surge
Tank
EGR Valve
Position
Sensor
A/F Sensor
(California A/T)
Heated Oxygen Sensor
(Bank 2 Sensor 1/
Except California A/T)
A/F Sensor
(California A/T)
Heated Oxygen
Sensor
(Bank 1 Sensor 1/
Except California A/T)
Heated Oxygen
Sensor
(Bank 1 Sensor 2) VCV
TWC VSV for EVAP
Fuel Tank
Charcoal
CanisterVSV for EGR
WU±TWC
(California A/T)
EVAP Service Port
Purge Line
Air Inlet Line
Air Drain Hose
WU±TWC
(California A/T)
EVAP Line
Vent Line
± EMISSION CONTROL (1MZ±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
EC±3
1418 Author: Date:
DRAWING

EC01X±03
P02006Cylinder Head sideClean Hose
P02477
Air Intake
Chamber Side
P12931
EC±4± EMISSION CONTROL (1MZ±FE)POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM
1419 Author: Date:
POSITIVE CRANKCASE
VENTILATION (PCV) SYSTEM
INSPECTION
1. INSPECT PCV VALVE
(a) Remove the PCV valve.
(b) Install clean hose to the PCV valve.
(c) Inspect the PCV valve operation.
(1) Blow air into the cylinder head side, and check that
air passes through easily.
CAUTION:
Do not suck air through the valve.
Petroleum substances inside the valve are harmful.
(2) Blow air into the air intake chamber side, and check
that air passes through with difficulty.
If operation is not as specified, replace the PCV valve.
(d) Remove clean hose from the PCV valve.
(e) Reinstall the PCV valve.
2. INSPECT HOSES, CONNECTIONS AND GASKETS
Visually check for cracks, leaks or damage.

EC0AU±01
B01507
Vapor Pressure Sensor
ConnectorVapor Pressure SensorVSV Connector for Vapor
Pressure SensorEVAP Line Hose
Vent Line Hose
Air Inlet Line Hose
Purge Line Hose
Air Drain Hose
VSV for Vapor Pressure Sensor
39.2 (400, 29)
N´m (kgf´cm, ft´lbf) : Specified torqueCharcoal Canister
± EMISSION CONTROL (1MZ±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±5
1420 Author: Date:
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
COMPONENTS

EC0AV±01
B01082B04812B06707
Type A
Type BGasket
Gasket
B06544
Vacuum
Gauge
S05331
TOYOTA
Hand±Held Tester
DLC3
EC±6
± EMISSION CONTROL (1MZ±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
1421 Author: Date:
INSPECTION
1. INSPECT LINES AND CONNECTORS
Visually check for loose connections, sharp bends or damage.
2. INSPECT FUEL TANK FILLER PIPE
Visually check for deformation, cracks or fuel leakage.
3. INSPECT FUEL TANK CAP
Visually 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 the
purge 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.

B06722
Battery
B06545
B06543
Hose Clipper
Air Drain Hose
± EMISSION CONTROL (1MZ±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±7
1422 Author: Date:
(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.
(e) Check the vacuum at idle.
Vacuum:
Maintain at 0.368 ± 19.713 in.Hg (5 ± 268 in.Aq) for over
5 seconds
HINT:
If the vacuum does not change, you can conclude that the hose
connecting the VSV to the service port has come loose or is
blocked, or the VSV is malfunctioning.
(f) 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 from the VSV terminals for the
EVAP.
(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) Check the pressure.
(1) Close off the air drain hose at the marked position
of the canister with a hose clipper or similar instru-
ment.