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Mitsubishi Colt Ralliart. Manual - part 755

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-345

Cooling fan
motor (HI)

Fan motor is
driven at high
speed

Ignition switch: ON

Fan motor
rotates at
high speed

Procedure
No. 23

P.13B-303

Cooling fan
motor (LO)

Fan motor is
driven at low
speed

Ignition switch: ON

Fan motor
rotates at
low speed

Procedure
No. 23

P.13B-303

Electronic-co
ntrolled
throttle valve
system

Stop the throttle
valve control
servo

Ignition switch: ON

Throttle
valve is
opened
slightly

Code No.
P0638

P.13B-174

Item
No.

Inspection
item

Drive content

Inspection conditions

Normal
condition

Inspection
procedure
No.

Reference
page

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-346

CHECK AT THE ECU TERMINALS

M1131155100140

TERMINAL VOLTAGE CHECK CHART

1. Disconnect the engine-ECU connector, and

connect check harness special tool MB991987
between the engine-ECU connectors.

2. Measure the voltage between each check

harness connector terminal and check harness
connector earth terminal (No. 75 or No. 76).

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

probe.

4. Referring to the check sheet, insert the micromini

probe into the check harness connector and
measure the voltage.

NOTE:

1. You may find it convenient to pull out the

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

2. 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!
5. If voltmeter shows any division from standard

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

6. After repair or replacement, recheck with the

voltmeter to confirm that the repair has corrected
the problem.

Engine-ECU Connector Terminal Arrangement

AK402726

19
34

51
6665

48
6362

45
6059

1615

42
5756

37
52

95 94

107
122

108
123

109
124

110
125

111
126

112
127

113
128

114
129

115
130

116
131

117
132

118
133

119
134

120
135

121
136

101100

102

103

104

105

106

919089

A-114

A-08

Special Tool Check Harness (MB991987) Connector Terminal Arrangement

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Throttle valve control
servo (+)

• Ignition switch: ON

• Accelerator pedal: fully opened → fully

closed

Decreases slightly
(approximately 2 V) from
system voltage

No. 1 injector

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

From 9

− 13 V momentarily

drops slightly

No. 2 injector

No. 3 injector

No. 4 injector

No. 1 ignition control Engine: 3,000 r/min

0.1

− 2.0 V

No. 2 ignition control

No. 3 ignition control

No. 4 ignition control

Camshaft position
sensor

Engine: Cranking

2.0

− 4.8 V

Engine: Idling

3.0

− 4.0 V

Crank angle sensor

Engine: Cranking

0.4

− 4.0 V

Engine: Idling

2.0

− 3.0 V

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-347

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

Throttle position
sensor (main)

• Remove the intake

air hose at the
throttle body

• Disconnect the

connector of the
electronic-controll
ed throttle valve

• Connect only

terminals No. 1,
No. 2, No. 3 and
No. 4 between
disconnected
connectors with
the use of the
special tool:
MB991658

• Ignition switch: ON

(engine stopped
condition)

Fully close the throttle
valve with your finger

0.2

− 0.6 V

Fully open the throttle
valve with your finger

4.3

− 4.7 V

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-348

Throttle position
sensor (sub)

• Remove the intake

air hose at the
throttle body

• Disconnect the

connector of the
electronic-controll
ed throttle valve

• Connect only

terminals No. 1,
No. 2, No. 3 and
No. 4 between
disconnected
connectors with
the use of the
special tool:
MB991658

• Ignition switch: ON

(engine stopped
condition)

Fully close the throttle
valve with your finger

4.3

− 4.7 V

Fully open the throttle
valve with your finger

0.2

− 0.6 V

Throttle valve control
servo (

−)

• Ignition switch: ON

• Accelerator pedal: fully closed → fully

opened

Decreases slightly
(approximately 2 V) from
system voltage

Power supply
voltage applied to
throttle position
sensor

Ignition switch: ON

4.9

− 5.1 V

Oxygen sensor
(front)

Engine: Running at 2,500 r/min after
warm-up

0.4 or less

⇔ 0.6 − 1.0 V

(Changes repeatedly)

Waste gate solenoid
valve

Ignition switch: ON

System voltage

After warming up engine: Idle operation
(when premium gasoline is used)

1 V or less

Purge control
solenoid valve

Ignition switch: ON

System voltage

Engine: After warming up, accelerate (4,000
r/min or less)

Voltage decreases

Ignition switch

− ST Engine: Cranking

8 V or more

Oxygen sensor
(front) heater

Engine: Idling

1 V or less

Engine: 5,000 r/min

System voltage

Oil feeder control
valve

Ignition switch: ON

System voltage

Operation at high load

− 10 V

Fuel pressure
solenoid valve

Ignition switch: ON

System voltage

Engine: Cranking

→ idle operation (within

approximately 2 minutes)

1 V or less

→ System

voltage

Alternator G terminal

• Engine: Idling after warm-up

• Radiator fan: Inoperative

• Headlamp switch: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage increases by 0.2

−

3.5 V

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Main

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