Mitsubishi Lancer Evolution IV, Workshop Manual

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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 from 11
14 V
14 No.2 injector
suddenly depress the accelerator pedal. slightly from 11 – 14 V.
2 No.3 injector
15 No.4 injector
3 Fuel pressure control
valve Ignition switch: ON Battery voltage
valve
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
for warming up Changes repeatedly
from battery voltage to
17 Stepper motor coil (A2)
for warming up from battery voltage to
0 – 6 V and from 0 – 6
V to battery voltage
5 Stepper motor coil (B1)
V to battery voltage.
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
valve
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
signal
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