Mitsubishi Lancer Evolution-IV Workshop Manual page 63

13-22
6. ENGINE-ECU INSPECTION
6-1 TERMINAL VOLTAGES
Engine ECU connector
Terminal Check item
No.
1 No.1 injector
14 No.2 injector
2 No.3 injector
15 No.4 injector
3 Fuel pressure control
valve valve
4 Stepper motor coil (A1)
17 Stepper motor coil (A2)
5 Stepper motor coil (B1)
18 Stepper motor coil (B2)
6 Secondary air control
solenoid valve
8 Fuel pump relay
10 Power transistor unit
(A)
23 Power transistor unit
(B)
11 Wastegate solenoid
valve valve
12 Power supply
25
19 Air flow sensor reset
signal signal
20 Fan motor relay (HI)
MPI –
Troubleshooting
Check condition (Engine condition)
While engine is idling after having been warmed up,
suddenly depress the accelerator pedal suddenly depress the accelerator pedal.
Ignition switch: ON
Engine: Cranking to idling (within about two minutes)
Engine: Immediately after engine has been started
for warming up for warming up
Ignition switch: ON
Ignition switch: ON
Engine: Idling
Engine speed: 3,000 r/min
Ignition switch: ON
Engine: At idle after having been warmed up (when
premium gasoline is used)
Ignition switch: ON
Engine: Idling
Engine speed: 3,000 r/min
Fan not operating (coolant temperature: 90_C or
below)
Fan at high speed (coolant temperature: 105_C or
above)
Normal condition
Momentarily drops
slightly from 11 – 14 V. slightly from 11 14 V
Battery voltage
0 – 3 V to battery
voltage
Changes repeatedly
from battery voltage to from battery voltage to
0 – 6 V and from 0 – 6
V to battery voltage V to battery voltage.
Battery voltage
Battery voltage
0 – 3 V
0.3 – 3.0 V
Battery voltage
0 – 3 V
Battery voltage
0 – 1 V
6 – 9 V
Battery voltage
0 – 3 V