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ENGINES
Jllll
EXHAUST GAS RECIRCULATION SYSTEM
A - To E G R - C T O Valve
B - To E G R Valve
90756
EGR SYSTEM THERMO VACUUM SWITCH
(TVS) FUNCTIONAL TEST
Cool the air cleaner intake air below the T V S
calibrated temperature, 4 ° C (40°F).
Disconnect the vacuum hoses from the T V S and
connect a vacuum pump to the inner port.
Apply vacuum to the T V S . Vacuum should be
maintained by T V S check valve. If vacuum is not
maintained, replace the T V S .
Start the engine and warm the air cleaner intake
air to above 1 3 ° C (55°F). Vacuum should not be
maintained. If vacuum is maintained by T V S ,
replace it.
EGR SYSTEM THERMO VACUUM
SWITCH REMOVAL
Remove the vacuum hoses from the T V S .
Remove the retaining clip(s) attaching the T V S
to the air cleaner.
Remove the T V S .
EGR SYSTEM THERMO VACUUM SWITCH
INSTALLATION
Install the T V S in the air cleaner.
Install the retaining clip(s).
Install the vacuum hoses.
Install the air cleaner.
EGR SYSTEM FORWARD DELAY VALVE
The E G R system forward delay valve is used
with certain four-cylinder engines. It is located
between the E G R T V S and the E G R valve.
Refer to the Vacuum Diagram for the exact
location.
Its purpose is to modify the initial vacuum
applied to the E G R valve by delaying the full
vacuum force.
With a gradual vacuum applied to the E G R
valve, a harsh, sudden activation of the E G R
system is avoided.
The black side of the valve must always be
installed toward the E G R vacuum source.
SEE
I.S.
N
O
T
E
S
Remove the air cleaner.
B-241
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Troubleshooting
