Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 egr system

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                                         EGR SYSTEM

                                         1988 Toyota Celica




         1988 EXHAUST EMISSION SYSTEMS
         Toyota EGR

    DESCRIPTION
         The Exhaust Gas Recirculation (EGR) system is used for the
reduction of NOx emissions by lowering combustion temperatures.
Recycling metered amounts of exhaust gas back into the intake system
lowers combustion temperatures.
         Each system has a vacuum-operated EGR valve and a vacuum
modulator. Temperature sensing devices control EGR operation.
         Temperature sensing device used could be a Vacuum Switching
Valve (VSV), a Bi-Metallic Vacuum Switching Valve (BVSV), a
Thermostatic Vacuum Switching Valve (TVSV), Vacuum Control Valve (VCV)
or a combination of these valves. A check valve, EGR cooler and
computer may also be used on some models.

    OPERATION
         When engine is below operating temperature, no exhaust gas
recirculation is obtained. Increase in engine temperature allows
control valves to regulate vacuum to EGR valve for gas recirculation.
         Vacuum modulator is used to regulate exhaust backpressure,
balance atmospheric pressure and vacuum to allow EGR operation at
heavy throttle. The EGR cooler, used on the Cressida and Supra assists
in reducing exhaust gas temperature before entering combustion
chamber.

    TESTING

    EGR TEST
         1) Ensure modulator filter is clean and in good condition
prior to performing test. Clean filter with compressed air if
necessary. Disconnect vacuum hose from EGR valve.
         2) Using a "T" connector, connect a vacuum gauge in EGR valve
line. Check that engine starts and runs at idle. This ensures proper
seating of EGR valve.
         3) The BVSV, TVSV, VSV and EGR modulator can be checked with
engine coolant below minimum temperature and specified engine RPM in
accordance with application. See EGR SPECIFICATIONS table. Different
valves are used depending on model. See Figs. 1 through 16.
         4) Operate engine with engine coolant below minimum
temperature and specified RPM. No vacuum reading should be obtained
when operated with engine coolant below minimum temperature.
         5) Operate engine at normal operating temperature and
specified RPM. See EGR SPECIFICATIONS table for specified engine RPM.
Low vacuum reading should be obtained.
         6) Vacuum reading of 2.6 in. Hg should be obtained on
Cressida and Supra models. On Cressida, Land Cruiser, Pickup and
4Runner (3.0L) and Supra non-turbo models, check that no vacuum is
shown at idle. Also check Corolla models with EFI, Corolla FX-16 and
the MR2 models at 5000 RPM. No vacuum should exist.
         7) Disconnect hose from the "R" port of EGR vacuum modulator
on all models except the Celica 4WD, Tercel Wagon, Pickup (turbo) and
Supra (turbo) models. See Figs. 1 through 16.
         8) Using additional hose, connect "R" port directly to intake
manifold. High vacuum reading should be obtained at specified engine
RPM. See EGR SPECIFICATIONS table.

NOTE:            Engine should misfire due to large amounts of exhaust gas
                 being injected into intake manifold.

         9) Disconnect vacuum gauge and install vacuum hoses. To check
EGR valve, apply vacuum directly to EGR valve with engine idling.
Engine should run rough. If system did not operate within
specifications, each component should be tested. See COMPONENT TEST in
this article.

EGR SPECIFICATIONS TABLE
 

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