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EGR SYSTEM TEST
WARNING:
APPLY
PARKING
BRAKE
AND/OR
BLOCK WHEELS BEFORE TESTING THE EGR SYS-
TEM.
(1) Check the condition of all EGR system hoses
and tubes for leaks, cracks, kinks and hardening of
rubber hoses. Repair and correct these conditions
before performing any tests.
(2) Be sure the hoses at both the EGR valve and
EGR valve control are connected to the proper fit-
tings (Fig. 5).
(3) Be sure the electrical connector is firmly con-
nected at the valve control.
(4) To check EGR system operation, connect the
DRB scan tool to the 16–way data link connector.
The data link connector is located on the lower edge
of the instrument panel near the steering column.
Refer to the appropriate Powertrain Diagnostic Pro-
cedures service manual for operation of the DRB
scan tool when diagnosing the EGR system.
(5) After checking the system with the DRB scan
tool, proceed to the following EGR Valve Leakage and
EGR Valve Control Tests and repair as necessary.
EGR GAS FLOW TEST
Use the following test procedure to determine if
exhaust gas is flowing through the EGR valve. It can
also be used to determine if the EGR tube is plugged,
or the system passages in the intake or exhaust man-
ifolds are plugged.
This is not to be used as a complete test of the
EGR system.
The engine must be started, running and warmed
to operating temperature for this test.
(1) All engines are equipped with two fittings
located on the EGR valve (Fig. 6). The upper fitting
(located on the vacuum motor) supplies engine vac-
uum to a diaphragm within the EGR valve for valve
operation. The lower fitting (located on the base of
the EGR valve) is used to supply exhaust back-pres-
sure to the EGR valve control.
(2) Disconnect the rubber hose at the vacuum
motor fitting (Fig. 6) on the top of the EGR valve
vacuum motor.
(3) Connect a hand-held vacuum pump to this fit-
ting.
(4) Start the engine.
(5) Slowly apply 5 inches of vacuum to the fitting
on the EGR valve motor.
(6) While applying vacuum, a minimum of 3 inches
of vacuum, and with the engine running at idle
speed, the idle speed should drop or the engine may
even stall, if the vacuum is applied quickly. This is
indicating that exhaust gas is flowing through the
EGR tube between the intake and exhaust manifolds.
Fig. 5 EGR Value and EGR Value —Typical
DIA-PHRAGM
PISTON
SPRING
EGR
VALVE
ASSEMBLY
VACUUMMOTOR
VACUUM
MOTOR FITTING
VACUUM
OUTLET
FITTING
TO
EGR
VALVE
EGR
VALVE
CON-
TROL ASSEMBLY
ELECTRIC
SOLENOID POR-
TION OF VALVE
CONTROL
VACUUM INLET FITTING
FROM ENGINE
BACK-
PRESSURE
HOSE
TRANSDUCER POR-
TION
OF
VALVE
CONTROL
ELECTRICAL
CONNECTION
POINT
EGR
VALVE
BACK-PRES-
SURE FITTING
EXHAUST
GAS
INLET
STEM
PROTECTOR
AND BUSHING
BASE
MOVEMENT
INDICATOR
POPPET
VALVE
SEAT
EXHAUST
GAS
OUT-
LET
Fig. 6 Typical EGR Valve
JX
EMISSION CONTROL SYSTEMS
25 - 25
DIAGNOSIS AND TESTING (Continued)
Summary of Contents for 1997 Stratus Convertible LHD
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