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-
II
is impossible
Communication with all systems is not possible.
1
13D-36
MUT-
II
is impossible
Communication with engine-ECU only is not possible.
2
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
3
13D-37
The engine warning lamp remains illuminating and never
goes out.
4
13D-38
Starting
No initial combustion (Starting not possible)
5
13D-38
Poor startability when engine is cold (Poor starting)
6
13D-39
Poor startability when engine is cold or warm (Poor starting)
7
13D-39
Idling stability
(Improper idling)
Idle speed is low when engine is cold (Improper idling
speed)
8
13D-40
Idling speed is high (Improper idling speed)
9
13D-40
Idling speed is low (Improper idling speed)
10
13D-41
Idle speed is unstable (Rough idling, hunting)
11
13D-41
Idling stability
(Engine stalls)
Engine stops soon after starting
12
13D-42
(Engine stalls)
Engine stops during idling
13
13D-42
Driving
Engine output is too low
14
13D-43
Abnormal engine knocking occurs
15
13D-43
Abnormally black smoke
16
13D-44
Abnormally white smoke
17
13D-44
Hunting occurs while driving
18
13D-45
DIESEL FUEL –
Troubleshooting
13D-36
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with MUT-
II
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
OK
Replace the MUT-
II
.
OK
Measure at the diagnosis connector
B-35.
Continuity between 4 and earth
Continuity between 5 and earth
OK: Continuity
NG
Check the harness wire between the
diagnosis connector and earth, and re-
pair if necessary.
OK
Check trouble symptom.
NG
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
NG
Check the following connectors:
B-75, B-81
NG
Repair
INSPECTION PROCEDURE 2
MUT-
II
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-
II
Malfunction of engine-ECU power supply circuit
Malfunction of the engine-ECU
Open circuit between engine-ECU and diagnosis
connector
OK
Check the engine-ECU power supply and earth circuit (Refer to
P.13D-45, INSPECTION PROCEDURE 19.)
NG
Check the harness wire between engine-ECU and diagnosis con-
nector.
NG
Repair
OK
Check trouble symptom.
Check the following connectors:
B-09, B-19, B-35, B-60X, A-122
NG
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
OK
Replace the engine-ECU.
OK
Check a burnt-out bulb.
NG
Replace
NG
Repair
Check the harness wire between the engine warning lamp and
the ignition switch, and repair if necessary.
OK
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
NG
Check the following connectors: B-78, B-80
NG
Check trouble symptom.
OK
Check the following connectors: B-01, B-02, B-19, A-122
NG
Repair
NG
Check trouble symptom.
OK
Check the harness wire between the engine warning lamp and
the engine-ECU.
NG
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
OK
Replace the engine-ECU.
No
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
NG
Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.
MUT-
II
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.
OK
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-
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
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