Mitsubishi 3000GT 1991 Service Manual page 227

FUEL SYSTEM - On-vehicle lnwection of MPI ComDonents
EGR CONTROL SOLENOID VALVE <California - Non Turbo, Turbo>
OPERATION
The EGR control solenoid valve is a duty control type solenoid valve. It makes control by leaking EGR valve
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operating negative pressure to the throttle body A port.
Power supply from the battery is sent through the control relay to the EGR control solenoid valve. When
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the engine control unit turns off the power transistor inside the unit, current no more flows through the
coil and EGR valve operating negative pressure leaks.
TROUBLESHOOTING HINT
If the results of EGR control solenoid valve on-vehicle and off-vehicle inspections are normal but the
self-diagnosis code for EGR system failure is displayed, check the EGR valve, vacuum hose and EGR passage
for blocking.
Control relav
connector
EGR control
solenoid valve
Engine
control
unit