Mitsubishi LANCER EVOLUTION-IV 1998 - Page 241

MPI – Troubleshooting
13-18
5. SERVICE DATA LIST
<EVOLUTION-IV>
Item
No.
Inspection
item
Inspection contents Normal condition
11 Oxygen
sensor
Engine: After having been warmed
up
Air/
f
uel mixture is made leaner when
When at 4,000 r/min, engine is
suddenly decelerated
200 mV or less
Ai
r
/f
ue
l
m
i
x
t
ure
i
s ma
d
e
l
eaner w
h
en
decelerating, and is made richer
when racing.
When engine is suddenly
raced
600 – 1,000 mV
Engine: After having been warmed
up
The ox
yg
en sensor si
g
nal is used to
Engine is idling 400 mV or less
(Chan
g
es)
The
oxygen
sensor
signal
is
used
to
check the air/fuel mixture ratio, and
control condition is also checked by
the ECU.
2,500 r/min
(Changes)
600 – 1,000 mV
12 Air flow
sensor
*
D Engine coolant temperature:
80 95
_
C
Engine is idling 17 – 43 Hz
sensor
*
80
–
95_C
D Lamps, electric cooling fan and
all accessories: OFF
2,500 r/min 46 – 86 Hz
a
ll
accessor
i
es:
OFF
D Transmission: Neutral
Engine is raced Frequency increases
in response to racing
13 Intake air
temperature
sensor
Ignition switch: ON or with engine
running
When intake air temperature
is –20_C
–20_C
sensor
When intake air temperature
is 0_C
0_C
When intake air temperature
is 20_C
20_C
When intake air temperature
is 40_C
40_C
When intake air temperature
is 80_C
80_C
14 Throttle
position
Ignition switch: ON Set to idle position 300 – 1,000 mV
pos
iti
on
sensor
Gradually open Increases in proportion
to throttle opening
angle
Open fully 4,500 – 5,500 mV
16 Power
supply
voltage
Ignition switch: ON System voltage
18 Cranking
signal
Ignition switch: ON Engine: Stopped OFF
g
(ignition
switch-ST)
Engine: Cranking ON
NOTE
*: When the car is new (distance it travelled is less than 500 km), output frequency of the air flow sensor may
become about 10% higher.