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Mitsubishi Space Star. Manual - part 84

DIESEL FUEL –

Troubleshooting

13D-35

INSPECTION CHART FOR TROUBLE SYMPTOMS

Caution
Check that the engine-ECU earth circuit is normal before checking for the cause of the problem.

Trouble symptoms

Inspection
procedure No.

Reference
page

Communication with
MUT-

is impossible

Communication with all systems is not possible.

13D-36

MUT-

is impossible

Communication with engine-ECU only is not possible.

13D-36

Engine warning lamp
and related parts

The engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position

13D-37

The engine warning lamp remains illuminating and never
goes out.

13D-38

Starting

No initial combustion (Starting not possible)

13D-38

Poor startability when engine is cold (Poor starting)

13D-39

Poor startability when engine is cold or warm (Poor starting)

13D-39

Idling stability
(Improper idling)

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

13D-40

Idling speed is high (Improper idling speed)

13D-40

Idling speed is low (Improper idling speed)

13D-41

Idle speed is unstable (Rough idling, hunting)

13D-41

Idling stability
(Engine stalls)

Engine stops soon after starting

13D-42

(Engine stalls)

Engine stops during idling

13D-42

Driving

Engine output is too low

13D-43

Abnormal engine knocking occurs

13D-43

Abnormally black smoke

13D-44

Abnormally white smoke

13D-44

Hunting occurs while driving

13D-45

DIESEL FUEL –

Troubleshooting

13D-36

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

Communication with MUT-

is not possible

(Communication with all systems is not possible)

Probable cause

The cause is probably a defect in the power supply system (including earth) for
the diagnosis line.

Malfunction of the connector

Malfunction of the harness wire

Replace the MUT-

Measure at the diagnosis connector
B-35.

Continuity between 4 and earth

Continuity between 5 and earth
OK: Continuity

Check the harness wire between the
diagnosis connector and earth, and re-
pair if necessary.

Check trouble symptom.

Check the harness wire between the
power supply and diagnosis connector,
and repair if necessary.

Measure at the diagnosis connector
B-35.

Voltage between 16 and earth
OK: System voltage

Check the following connectors:
B-75, B-81

Repair

INSPECTION PROCEDURE 2

MUT-

communication with engine-ECU is impossible.

Probable cause

One of the following causes may be suspected.

No power supply to engine-ECU

Defective earth circuit of engine-ECU

Defective engine-ECU

Improper communication line between engine-ECU and MUT-

Malfunction of engine-ECU power supply circuit

Malfunction of the engine-ECU

Open circuit between engine-ECU and diagnosis
connector

Check the engine-ECU power supply and earth circuit (Refer to
P.13D-45, INSPECTION PROCEDURE 19.)

Check the harness wire between engine-ECU and diagnosis con-
nector.

Repair

Check trouble symptom.

Check the following connectors:
B-09, B-19, B-35, B-60X, A-122

Repair

NOTE
On vehicles with the multi-center display, if a malfunction cannot be resolved after the procedure above,
check the multi-center display and replace if necessary. (Refer to GROUP 54 – Multi-center Display.)

DIESEL FUEL –

Troubleshooting

13D-37

INSPECTION PROCEDURE 3

The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position

Probable cause

Because there is a burnt-out bulb, the engine-ECU causes the engine warning lamp
to illuminate immediately after the ignition switch is turned to ON.
If the engine warning lamp does not illuminate immediately after the ignition switch
is turned to ON, one of the malfunctions listed at right has probably occurred.

Burnt-out bulb

Defective warning lamp circuit

Malfunction of the engine-ECU

Replace the engine-ECU.

Check a burnt-out bulb.

Replace

Repair

Check the harness wire between the engine warning lamp and
the ignition switch, and repair if necessary.

Measure at the combination meter connector B-01.

Disconnect the connector and measure at the harness side.

Voltage between 49 and earth (Ignition switch: ON)
OK: System voltage

Check the following connectors: B-78, B-80

Check trouble symptom.

Check the following connectors: B-01, B-02, B-19, A-122

Repair

Check trouble symptom.

Check the harness wire between the engine warning lamp and
the engine-ECU.

Repair

DIESEL FUEL –

Troubleshooting

13D-38

INSPECTION PROCEDURE 4

The engine warning lamp remains illuminating and never
goes out

Probable cause

In cases such as the above, the cause is probably that the engine-ECU is detecting
a problem in a sensor or actuator, or that one of the malfunctions listed at right
has occurred.

Short-circuit between the engine warning lamp and
engine-ECU

Malfunction of the engine-ECU

Replace the engine-ECU.

Measure at the combination meter connector B-02.

Disconnect the connector and measure at the harness side.

Continuity between 4 and earth
OK: No continuity

Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.

MUT-

Self-Diagnosis code

Are diagnosis code output?

Yes

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

INSPECTION PROCEDURE 5

No initial combustion (Starting not possible)

Probable cause

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

Malfunction of the control system

Malfunction of the high pressure pump

Malfunction of the glow system

Malfunction of the immobilizer system

Malfunction of the engine-ECU

Yes

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

Check the following items.

Glow plug, glow plug relay (glow relay box)

Battery

High pressure pump

Compression pressure

Fuel injector

Contamination (water, kerosene, etc.) in fuel

MUT-

Self-Diagnosis code

Are diagnosis code output?

Carry out MUT-

data list

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

Repair

Content .. 82 83 84 85 ..