Mitsubishi Eclipse 1990 Service Manual page 547

Code No. Excessive
Control
[Comment]
Background
The system reduces exhaust emissions by means of closed-loop fuel control.
The engine control module checks the time taken until closed-loop fuel control commences.
Check Area
Engine coolant temperature is higher than
Intake air temperature is
Barometric pressure is 76
Engine speed is at between about 1800 and 3500
Volumetric efficiency is 16
Running within air/fuel mixture ratio feedback zone.
Monitoring time: 128
Judgement Criteria
fuel injection system doesn't enter the closed loop control within about 30 sec.
Monitored only once per trip.
Check the heated oxygen sensor (front). (Refer to
Engine>
Check the harness wire between the ECM and the heated oxygen
sensor connector.
Check me Injector. (Refer to P.l
Check the fuel pressure. (Refer to
Check for air being drawn into me air intake system.
Check for exhaust gas leaks (oxygen sensor fitting, exhaust
Check the fuel pump (insufficient discharge).
Replace the ECM.
ENGINE (TURBO)
AND ENGINE>
to Enter Closed Loop Fuel
or higher
(11 psi.) or higher.
62%.
OK
OK
OK
OK
OK
Revision
Troubleshooting
Replace
NG
Repair
NG
Repair
NG
Replace
NG
Repair
NG
Repair
Heated oxygen failed
Injector failed
Fuel pressure regulator failed
Fuel pump failed
Fuel filter blocked,
into
intake system-
Exhaust-gas leak
Engine control module
,