Mitsubishi LANCER EVOLUTION-IV 1998 - Page 245

MPI – Troubleshooting
13-22
6. ENGINE-ECU INSPECTION
6-1 TERMINAL VOLTAGES
Engine ECU connector
Terminal
No.
Check item Check condition (Engine condition) Normal condition
1 No.1 injector While engine is idling after having been warmed up,
suddenly depress the accelerator pedal
Momentarily drops
slightly
f
rom 11 14V
14 No.2 injector
su
dd
en
l
y
d
epress
th
e acce
l
era
t
or pe
d
a
l
. s
li
g
htl
y
f
rom
11
–
14
V
.
2 No.3 injector
15 No.4 injector
3 Fuel pressure control
valve
Ignition switch: ON Battery voltage
va
l
ve
Engine: Cranking to idling (within about two minutes) 0 – 3 V to battery
voltage
4 Stepper motor coil (A1) Engine: Immediately after engine has been started
f
or warming up
Changes repeatedly
f
rom battery voltage to
17 Stepper motor coil (A2)
f
or warm
i
ng up
f
rom
b
a
tt
ery vo
lt
age
t
o
0 – 6 V and from 0 – 6
V to battery voltage
5 Stepper motor coil (B1)
V
to
b
attery vo
l
tage.
18 Stepper motor coil (B2)
6 Secondary air control
solenoid valve
Ignition switch: ON Battery voltage
8 Fuel pump relay Ignition switch: ON Battery voltage
Engine: Idling 0 – 3 V
10 Power transistor unit
(A)
Engine speed: 3,000 r/min 0.3 – 3.0 V
23 Power transistor unit
(B)
11 Wastegate solenoid
valve
Ignition switch: ON Battery voltage
va
l
ve
Engine: At idle after having been warmed up (when
premium gasoline is used)
0 – 3 V
12 Power supply Ignition switch: ON Battery voltage
25
19 Air flow sensor reset
signal
Engine: Idling 0 – 1 V
s
i
gna
l
Engine speed: 3,000 r/min 6 – 9 V
20 Fan motor relay (HI) Fan not operating (coolant temperature: 90_C or
below)
Battery voltage
Fan at high speed (coolant temperature: 105_C or
above)
0 – 3 V