Content .. 778 779 780 781 ..

Mitsubishi Grandis. Manual - part 780

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-371

Actuator Test Reference Table

M1131152500796

Item
No.

Inspection
item

Drive content

Inspection
conditions

Normal
condition

Code No.
/Inspection
procedure No.

Reference
page

Injector

Cut off No. 1
injector

Engine: After
warm-up, idle
operation (Cut off
injectors sequentially
to check for a cylinder
that does not change
engine in idle status.

Engine is
changed
(becomes
unstable or
stalled)

Code No.
P0201

P.13A-115

Cut off No. 2
injector

Code No.
P0202

P.13A-120

Cut off No. 3
injector

Code No.
P0203

P.13A-125

Cut off No. 4
injector

Code No.
P0204

P.13A-130

Fuel pump

Drive fuel pump
to circulate fuel

Ignition
switch:
"ON"

Check for
pump
operating
noise near
fuel tank

Operating
noise audible

Procedure No.
23

P.13A-328

Purge control
solenoid
valve

Switch solenoid
valve from OFF
to ON

Ignition switch: "OFF" When the

valve is
actuated,
operating
noise is
audible

Code No.
P0443

P.13A-184

Basic ignition
timing

Switch
engine-ECU
<M/T> or
engine-A/T-ECU
<A/T> to ignition
timing adjusting
mode

• Engine: Idle

operation

• Install timing light

° BTDC

−

Fan
controller

Actuate fan
motor

• Ignition switch:

"ON"

• A/C switch: ON

Fan motor is
rotated

Procedure No.
21

P.13A-318

Oil control
valve

Oil control valve
turns from OFF
the ON

Ignition switch: "ON"

Clicks when
oil control
valve is
driven

Code No.
P1021

P.13A-225

Throttle valve
control servo

Stop the throttle
valve control
servo

Ignition switch: "ON"

Throttle valve
is open

Code No.
P2100, P2101,
P2102, P2103

P.13A-234
P.13A-239
P.13A-242
P.13A-245

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-372

CHECK AT THE ECU TERMINALS

M1131153500368

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 <M/T> or engine-A/T-ECU <A/T>
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 <M/T> or engine-A/T-ECU <A/T>
connector connected.

2. You may find it convenient to pull out the

engine-ECU <M/T> or engine-A/T-ECU <A/T>
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 <M/T> or
engine-A/T-ECU <A/T> 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.

Engine-ECU <M/T> or engine-A/T-ECU <A/T> Connector Terminal Arrangement

AK201749AB

Needle-nosed wire probe

100

101

102

103

104

105

106

107

108

109

110

111

112

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

113

114

115

116

117

118

119

120

AK303309

Engine-ECU <M/T> or Engine-A/T-ECU <A/T> Connector

C-110

C-113

C-114

C-112

C-111

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

No. 1 injector

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

EGR valve (A)

Ignition switch: Immediately after turning ON 5

− 8 V* (fluctuates for

approximately 3 seconds)

EGR valve (B)

EGR valve (C)

EGR valve (D)

A/C relay

• Engine: Idle speed

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

is operating)

System voltage

→ 1 V or

less

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-373

Cylinder 2,3 oxygen
sensor heater (front)

Engine: Idling after warming up

− 5 V*

Engine: 4,000 r/min or more

0 V

Throttle valve control
servo relay

Ignition switch: ON

System voltage

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

1 V or less

Fuel pump relay

Ignition switch: ON

System voltage

Engine: Idle speed

1 V or less

Fan controller

Radiator and condenser fan is not operating 0

− 0.3 V*

Radiator and condenser fan is operating

0.7 V* or more

Cylinder 2,3 oxygen
sensor heater (rear)

Engine: Idling after warming up

System voltage

Engine: 4,000 r/min or more

0 V

Purge control
solenoid valve

Ignition switch: ON

Decreases Voltage

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

1 V or less

Cylinder 1,4 oxygen
sensor heater (rear)

Engine: Idling after warming up

System voltage

Engine: 4,000 r/min or more

0 V

Cylinder 1,4 oxygen
sensor heater (front)

Engine: Idling after warming up

− 5 V*

Engine: 4,000 r/min or more

0 V

Ignition coil

− No. 1

Engine r/min: 3,000 r/min

0.3

− 3.0 V*

Ignition coil

− No. 2

Ignition coil

− No. 3

Ignition coil

− No. 4

Power supply

Ignition switch: ON

System voltage

43
40 <M/T> Clutch pedal position

switch

Depress the clutch pedal

System voltage

Release the clutch pedal

1 V or less

Alternator G terminal

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

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage increases

Ignition switch

− IG

Ignition switch: ON

System voltage

Ignition switch

− ST Engine: Cranking

8 V or more

Engine control relay
(Power supply)

Ignition switch: "LOCK" (OFF)

System voltage

Ignition switch: ON

1 V or less

Backup power
supply

Ignition switch: "LOCK" (OFF)

System voltage

Air flow sensor

Engine: Gradually increase the speed.

Voltage increase in
response to revving

Crank angle sensor

Engine: Cranking

0.4

− 4.0 V

Engine: Idling

2.0

− 3.0 V

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-374

Camshaft position
sensor

Engine: Cranking

2.0

− 4.8 V

Engine: Idling

3.0

− 4.0 V

79 <M/T> Vehicle speed

sensor

• Ignition switch: "ON"

• Move the vehicle forword slowly

⇔ 5 V Changes

repeatedly

Power steering fluid
pressure sensor

Engine: Idling after
warning up

When steering wheel
is Stationary

0.4

− 1.0 V

When steering wheel
is turned

Voltage rises

Full lock

3.0

− 4.0 V

Alternator FR
terminal

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

• Headlamp: OFF → ON

• Stop lamp: OFF → ON

• Rear defogger switch: OFF → ON

Voltage decreases

Power supply
voltage applied to
accelerator pedal
position sensor

Ignition switch: "ON"

4.9

− 5.1 V

Oil control valve

Ignition switch: ON

System voltage

Engine: warming up, 4,000 r/min

4.0

− 10 V*

Sensor impressed
voltage

Ignition switch: ON

4.9

− 5.1 V

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

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

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

Content .. 778 779 780 781 ..