Mitsubishi Lancer Evolution IX. Manual — part 476

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-379

CHECK AT THE ENGINE-ECU
TERMINALS

M1131153500744

TERMINAL VOLTAGE CHECK CHART

1. Connect a needle-nosed wire probe to a voltmeter

probe.

2. Insert the needle-nosed wire probe into each of

the engine-ECU connector terminals from the wire
side, and measure the voltage while referring to
the check chart.

NOTE:

.

1. Make the voltage measurement with the

engine-ECU connector connected.

2. You may find it convenient to pull out the

engine-ECU to make it easier to reach the
connector terminals.

3. The checks can be carried out off the order

given in the chart.

CAUTION

Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU or all of
them. Be careful to prevent this!
3. If voltmeter shows any division from standard

value, check the corresponding sensor, actuator
and related electrical wiring, then repair or
replace.

4. After repair or replacement, recheck with the

voltmeter to confirm that the repair has corrected
the problem.

21

Fan
controller

Actuate fan
motor

• Ignition switch: "ON"

• A/C switch: ON

Fan motor is
rotated

Procedure
No. 25

P.13A-32
4

37

Condenser
fan (high)

Condenser fan
motor is driven.

Ignition switch: "ON"

Fan motor
rotates at high
speed

Procedure
No. 26

P.13A-33
0

38

Condenser
fan (low)

Condenser fan
motor is driven.

Ignition switch: "ON"

Fan motor
rotates at low
speed

Item
No.

Inspection
item

Drive content

Inspection conditions

Normal
condition

Code No.
/Inspection
procedure
No.

Reference
page

AK201749AB

Needle-nosed wire probe

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-380

Engine-ECU Connector Terminal Arrangement

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

1

No. 1 injector

While engine is idling after having warmed
up, suddenly depress the accelerator pedal.

From 11

− 14 V,

momentarily drops slightly

9

No. 2 injector

24

No. 3 injector

2

No. 4 injector

3

Oxygen sensor
heater (front)

Engine: Idling after warming up

1 V or less

Engine r/min: 5,000 r/min

System voltage

6

EGR control
solenoid valve

Ignition switch: "ON"

System Voltage

While engine is idling, suddenly depress the
accelerator pedal.

From system voltage,
momentarily drops

8

Alternator G terminal

• Engine: Warm, idle (radiator fan: OFF)

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage increases by 0.2

−

3.5 V

11

Ignition coil

− No. 1,

No. 4

Engine r/min: 3,000 r/min

0.3

− 3.0 V

12

Ignition coil

− No. 2,

No. 3

14

Stepper motor coil
<A1>

• Engine: Soon after the warmed up engine

is started

• A/C switch: OFF → ON (A/C compressor

is operating)

• Headlight switch: OFF → ON

System voltage

⇔ 1V or

less (Changes repeatedly)

28

Stepper motor coil
<A2>

15

Stepper motor coil
<B1>

29

Stepper motor coil
<B2>

16

Purge control
solenoid valve

Ignition switch: "ON"

System voltage

Running at 3,500 r/min while engine is
warming up after having been started.

1 V or less

18

Fan controller

Radiator fan is not operating

0

− 0.3 V

Radiator fan is operating

0.7 V or more

19

Air flow sensor reset
signal

Engine: Idle speed

0

− 1 V

Engine r/min: 3,000 r/min

6

− 9 V

20

A/C relay

• Engine: Idle speed

• A/C switch: OFF → ON (A/C compressor

is operating)

System voltage or
Momentarily 6 V or more
→ 1 V or less

21

Fuel pump relay 2

Ignition switch: "ON"

System voltage

Engine: Idle speed

1 V or less

22

Engine warning lamp Ignition switch: "LOCK" (OFF)

→ "ON"

1 V or less

→ System

voltage (After several
seconds have elapsed)

26

Oxygen sensor
heater (rear)

Engine: Idling after warming up

1 V or less

Engine: Racing

System voltage

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-381

30

Condenser fan
motor relay (high)

Fan inactive state (Engine coolant
temperature: 90

°C or less)

System voltage

Fan high-speed rotation state (Engine
coolant temperature: 105

°C or less)

1 V or less

31

Condenser fan
motor relay (low)

Fan inactive state (Engine coolant
temperature: 90

°C or less)

System voltage

Fan low-speed rotation state (Engine coolant
temperature: 95

− 100°C or less)

1 V or less

33

Oil feeder control
valve

Ignition switch: "ON"

System voltage

High-load running

4.0

− 10 V

41

Waste gate solenoid
valve

Ignition switch: "ON"

System voltage

Engine: After warm-up, idle operation (When
using premium gasoline)

1 V or less

42

Sensor impressed
voltage

Ignition switch: "ON"

4.9

− 5.1 V

43

Crank angle sensor

Engine: Cranking

0.4

− 4.0 V

Engine: Idling speed

1.5

− 2.5 V

44

Engine coolant
temperature sensor

Ignition switch: "ON"

When engine coolant
temperature is

−20°C

3.9

− 4.5 V

When engine coolant
temperature is 0

°C

3.2

− 3.8 V

When engine coolant
temperature is 20

°C

2.3

− 2.9 V

When engine coolant
temperature is 40

°C

1.3

− 1.9 V

When engine coolant
temperature is 60

°C

0.7

− 1.3 V

When engine coolant
temperature is 80

°C

0.3

− 0.9 V

45

Tachometer signal

Engine r/min: 3,000 r/min

0.3

− 3.0 V

47

Power supply

Ignition switch: "ON"

System voltage

59
48

Fuel pressure
control solenoid
valve

Ignition switch: "ON"

System voltage

Engine: Cranking

→ Idle operation (within

approximately 2 minutes or less)

1 V or less

→ System

voltage

50

Exhaust camshaft
position sensor

Engine: Cranking

0.4

− 3.0 V

Engine: Idling

1.5

− 3.0 V

51

Barometric pressure
sensor

Ignition switch: "ON"

Altitude: 0 m

3.8

− 4.2 V

Altitude: 600 m

3.5

− 3.9 V

Altitude: 1,200 m

3.3

− 3.7 V

Altitude: 1,800 m

3.0

− 3.4 V

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-382

52

Alternator FR
terminal

• Engine: Warm, idle (radiator fan: OFF)

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage decreases

53

Intake camshaft
position sensor

Engine: Cranking

0.4

− 3.0 V

Engine: Idling

1.5

− 3.0 V

54

Power steering fluid
pressure switch

Engine: Idling after
warming up

When steering wheel
is stationary

System voltage

When steering wheel
is turned

1 V or less

55

Fuel pump relay 3

While engine is idling, suddenly depress the
accelerator pedal.

Temporarily rises slightly
from 1 V or less.

57

Control relay (Power
supply)

Ignition switch: "LOCK" (OFF)

System voltage

Ignition switch: "ON"

1 V or less

60

Backup power
supply

Ignition switch: "LOCK" (OFF)

System voltage

61

Air flow sensor

Engine: Idle speed

2.2

− 3.2 V

Engine r/min: 2,500 r/min

62

Intake air
temperature sensor

Ignition switch: "ON"

When intake air
temperature is

−20°C

3.8

− 4.4 V

When intake air
temperature is 0

°C

3.2

− 3.8 V

When intake air
temperature is 20

°C

2.3

− 2.9 V

When intake air
temperature is 40

°C

1.5

− 2.1 V

When intake air
temperature is 60

°C

0.8

− 1.4 V

When intake air
temperature is 80

°C

0.4

− 1.0 V

65

A/C load signal

Refer to GROUP 55 - Troubleshooting (Inspection at the Automatic
compressor - ECU Terminal)

68

Ignition switch-ST

Engine: Cranking

8 V or more

71

Oxygen sensor
(front)

Engine: Running at 2,500 r/min after warmed
up (Check using a digital type voltmeter)

0

⇔ 0.8 V (Changes

repeatedly)

73

Oxygen sensor
(rear)

Engine: Idling after warmed up (Check using
a digital type voltmeter)

0

⇔ 0.6 V (Changes

repeatedly)

78

Throttle position
sensor

Ignition switch: "ON"

Set throttle valve to
idle Position

0.535

− 0.735 V

Fully open throttle
valve

4.4

− 5.3 V

80

Vehicle speed
sensor

• Ignition switch: "ON"

• Move the vehicle forword slowly

0

⇔ 5 V Changes

repeatedly

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition