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.)