Mitsubishi Space Star. Manual - part 86

DIESEL FUEL – 

Troubleshooting

13D-43

INSPECTION PROCEDURE 14

Engine output is too low

Probable cause

The cause is probably a malfunction of the control system, high pressure pump,
fuel system or EGR system.



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the EGR system



Clogged air flow sensor



Malfunction of the engine-ECU

Yes

Refer to P.13D-7, INSPECTION CHART FOR DIAGNOSIS
CODES.

OK

Check the following items.



Clogged air flow sensor



Fuel injector



EGR system



Turbocharger



Compression pressure



High pressure pump



Fuel pressure regulator



Contamination (water, kerosene, etc.) in fuel

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

check and actuator test.
(Refer to P.13D-46, 50.)

NG

Repair

INSPECTION PROCEDURE 15

Abnormal engine knocking occurs

Probable cause

The cause is probably a malfunction of the control system, high pressure pump
or fuel system.



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the engine-ECU

Yes

Refer to P.13D-7, INSPECTION CHART FOR DIAGNOSIS
CODES.

OK

Check the following items.



Fuel injector



High pressure pump



Fuel pressure regulator

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

check and actuator test.
(Refer to P.13D-46, 50.)

NG

Repair

DIESEL FUEL – 

Troubleshooting

13D-44

INSPECTION PROCEDURE 16

Abnormally black smoke

Probable cause

The cause is probably a malfunction of the control system, high pressure pump,
fuel system or EGR system.



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the EGR system



Malfunction of the engine-ECU

Yes

Refer to P.13D-7, INSPECTION CHART FOR DIAGNOSIS
CODES.

OK

Check the following items.



Air cleaner



Fuel injector



EGR system



Turbocharger



High pressure pump



Fuel pressure regulator

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

check and actuator test.
(Refer to P.13D-46, 50.)

NG

Repair

INSPECTION PROCEDURE 17

Abnormally white smoke

Probable cause

The cause is probably a malfunction of the control system, high pressure pump,
fuel system, EGR system or glow system.



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the EGR system



Malfunction of the glow system



Malfunction of the engine-ECU

Yes

Refer to P.13D-7, INSPECTION CHART FOR DIAGNOSIS
CODES.

OK

Check the following items.



Glow plug, glow plug relay (glow relay box)



Fuel injector



EGR system



Turbocharger



High pressure pump



Fuel pressure regulator

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

check and actuator test.
(Refer to P.13D-46, 50.)

No

Repair

DIESEL FUEL – 

Troubleshooting

13D-45

INSPECTION PROCEDURE 18

Hunting occurs while driving

Probable cause

The cause is probably a malfunction of the control system, high pressure pump
or fuel system.



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the engine-ECU

Yes

Refer to P.13D-7, INSPECTION CHART FOR DIAGNOSIS
CODES.

OK

Check the following items.



Fuel injector



Fuel filter



EGR system



High pressure pump



Fuel pressure regulator

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

check and actuator test.
(Refer to P.13D-46, 50.)

NG

Repair

INSPECTION PROCEDURE 19

Check the engine-ECU power supply and earth circuit

NG

Replace the engine-ECU.

OK

Check trouble symptom.

OK

Check the following connector:
A-121

NG

Repair

NG

Check the harness wire between the engine-ECU and main relay
connector, and repair if necessary.

OK

Check trouble symptoms.

Measure at the engine-ECU connector A-121.



Disconnect the connector and measure at the harness side.

(1) Voltage between 76 and earth

(When terminal 80 is shorted to earth)
OK: System voltage

(2) Continuity between 75, 87, 88 and earth

OK:  Continuity

(1) NG

Check the following
connector:
B-26

NG

Repair

(2) NG

Check the harness wire between the engine-ECU and earth, and
repair if necessary.

DIESEL FUEL – 

Troubleshooting

13D-46

DATA LIST REFERENCE TABLE

Caution
Driving tests always need another personnel.

Item
No.

Inspection
item

Inspection contents

Normal 
condition

Inspection
procedure
No.

Reference
page

01

Engine
coolant
tempera

Ignition switch: ON

Engine coolant tem-
perature is –20



C

–20



C

Code No. 19

13D-16

tempera-
ture sensor

Engine coolant tem-
perature is 0



C

0



C

Engine coolant tem-
perature is 20



C

20



C

Engine coolant tem-
perature is 40



C

40



C

Engine coolant tem-
perature is 80



C

80



C

02

Fuel tem-
perature
sensor



In cooled state



Ignition switch: ON

Approx. the
same as the
outdoor tem-
perature

Code No. 21

13D-17

03

Intake air
tempera-
ture sensor

Ignition switch: ON

Intake air tempera-
ture is –20



C

–20



C

Code No. 22

13D-18

ture sensor

Intake air tempera-
ture is 0



C

0



C

Intake air tempera-
ture is 20



C

20



C

Intake air tempera-
ture is 40



C

40



C

Intake air tempera-
ture is 80



C

80



C

04

Boost sen-
sor

Ignition switch: ON

950  – 1040
hPa

Code No. 16

13D-13



Engine coolant tem-
perature: 80 – 95



C



Lamp, electric cool-
ing fan and all ac-
cessories: OFF

When engine is sud-
denly raced

Pressure in-
creases

05

Barometric
pressure
sensor

Ignition switch: ON

At altitude of 0 m

950  – 1040
hPa

Code No. 17

13D-14

06

Fuel pres-
sure sensor

Engine: After warm-up

When engine is sud-
denly raced

Pressure in-
creases

Code No. 15

13D-12

07

Fuel pres-
sure sensor
(command
value)

Engine: After warm-up

When engine is sud-
denly raced

Pressure in-
creases

–

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