Mitsubishi Space Star. Manual - part 85

DIESEL FUEL – 

Troubleshooting

13D-39

INSPECTION PROCEDURE 6

Poor startability when engine is cold (Poor starting)

Probable cause

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



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel 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



Engine oil viscosity



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 7

Poor startability when engine is both cold and warm (Poor
starting)

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



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

DIESEL FUEL – 

Troubleshooting

13D-40

INSPECTION PROCEDURE 8

Idle speed is low when engine is cold (Improper idling
speed)

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



Fuel filter

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

No

Carry out MUT-

II

 data list

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

NG

Repair

INSPECTION PROCEDURE 9

Idle speed is high (Improper idling speed)

Probable cause

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



Malfunction of the control system



Malfunction of the fuel injector



Malfunction of the high pressure pump



Malfunction of the engine-ECU

Yes

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

OK

Check the following items.



Maladjustment of the idle speed



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

NG

Repair

DIESEL FUEL – 

Troubleshooting

13D-41

INSPECTION PROCEDURE 10

Idle speed is low (Improper idling speed)

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.



High pressure pump



Fuel injector



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 11

Idle speed is unstable (Rough idling, hunting)

Probable cause

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



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the fuel system



Malfunction of the glow 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.



Glow plug, glow plug relay (glow relay box)



EGR system



Fuel injector



Compression pressure



Valve clearance



Air in fuel line



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-42

INSPECTION PROCEDURE 12

Engine stops soon after starting

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



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 13

Engine stops during idling

Probable cause

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



Malfunction of the control system



Malfunction of the high pressure pump



Malfunction of the EGR system



Malfunction of the engine-ECU

NG

Repair

No

Yes

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

OK

Check the following items.



Power supply system



EGR system



High pressure pump



Fuel pressure regulator

MUT-

II

 Self-Diagnosis code

Are diagnosis code output?

Carry out MUT-

II

 data list

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