Egr System Inspection <California - Mitsubishi 1989-1993 GALANT Service Manual

EMISSION CONTROL SYSTEMS -
1
TSB Revision
Exhaust Gas Recirculation (EGR) System
EGR SYSTEM INSPECTION <Federal>
(1) Disconnect the vacuum
throttle body, and connect a hand vacuum pump to the
vacuum hose.
(2) Under the engine conditions described below, provide a
vacuum by using the hand vacuum pump, and then check.
When Engine is Cold-
coolant temperature 50°C (122°F) or below
Applying
Engine operating
condition
Try applying vacuum Vacuum leaks
Idling
When Engine is Hot-
coolant temperature 85"-95°C (185"-205°F) or higher
Applying vacuum
Engine operating
condition
Idling 45 mmHg
(1.7 in.Hg.1
Changes from
idling to slightly
unstable
EGR SYSTEM INSPECTION <California>
(1) Disconnect the vacuum hose (green striped hose) from the
exhaust gas recirculation (EGR) valve, and then connect a
manual vacuum pump via the three-way terminal.
(2) Check the following points when the engine is cold [engine
coolant temperature is 20°C (68°F) or below] and when the
engine is warm [engine coolant temperature is 70°C (158°F)
or higher].
hose (green stripe) from the
R e s u l t
vacuum
Result
Vacuum is maintained
Vacuum is maintained