Mitsubishi 1989-1993 GALANT Service Manual page 433

FUEL SYSTEM <DOHC> -
INSPECTION
Using Scan tool
Item No.
Function
Data reading
11
HARNESS INSPECTION
connector
4 3
connector
Data display Inspection conditions
Engine: warm up
Sensor de-
tection vol- (Make the mixture lean
tage by engine speed reduc-
tion, and rich by racing)
Engine: warm up
(using the oxygen sen-
also check the condition
of control by the engine
control module)
Measure the power supply voltage of
the heated oxygen sensor.
C o n n e c t o r : D i s c o n n e c t e d
Ignition switch: ON
Engine
Check for an open-circuit or a short-
control module
circuit to ground, between the engine
harness side
control module and the heated oxy-
gen sensor.
. Heated oxygen sensor connec-
tor: Disconnected
. Engine control module connec-
tor: Disconnected
Check for continuity of the ground
circuit.
Disconnected
. Connector:
On-Vehicle inspection of MFI Components
Engine condition
When sudden decel-
eration from 4,000 rpm
When engine is sud-
750 rpm (Idling)
<Non-Turbo>
2,000 rpm
I
I
Standard value
250 mV or lower
400 mV or lower
(changes)
I
Repair the
harness.
harness.
Ground)