Mitsubishi Space Star. Manual — part 63
MPI –
Troubleshooting
13B-39
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure
No.
Reference page
Communication
with MUT-
II
is
Communication with all systems is not possible.
1
13B-40
with MUT-
II
is
impossible.
Communication with engine-ECU only is not possible.
2
13B-40
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
13B-41
related parts
The engine warning lamp remains illuminating and never goes
out.
4
13B-41
Starting
No initial combustion (starting impossible)
5
13B-42
Initial combustion but no complete combustion
(starting impossible)
6
13B-43
Long time to start (improper starting)
7
13B-44
Idling stability
(Improper idling)
Unstable idling (Rough idling, hunting)
8
13B-45
(Improper idling)
Idling speed is high. (Improper idling speed)
9
13B-47
Idling speed is low. (Improper idling speed)
10
13B-47
Idling stability
(Engine stalls)
When the engine is cold, it stalls at idling. (Die out)
11
13B-48
(Engine stalls)
When the engine becomes hot, it stalls at idling. (Die out)
12
13B-49
The engine stalls when starting the car. (Pass out)
13
13B-51
The engine stalls when decelerating.
14
13B-51
Driving
Hesitation, sag or stumble
15
13B-52
The feeling of impact or vibration when accelerating
16
13B-53
The feeling of impact or vibration when decelerating
17
13B-53
Poor acceleration
18
13B-54
Surge
19
13B-55
Knocking
20
13B-56
Dieseling
21
13B-56
Too high CO and HC concentration when idling
22
13B-57
Fans (radiator fan, A/C condenser fan) are inoperative
23
13B-58
MPI –
Troubleshooting
13B-40
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
Measure at the diagnosis connector
(16-pin) B-35.
Voltage between 16 and earth
OK: Battery voltage
NG
Check the following connectors:
B-75, B-81
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
power supply and diagnostic connector
(16-pin), and repair if necessary.
OK
Measure at the diagnosis connector
(16-pin) B-35.
Continuity between 4 and earth
Continuity between 5 and earth
OK: Continuity
NG
Check the harness wire between the
diagnostic connector (16-pin) and
earth, and repair if necessary.
OK
Replace the MUT-
II
.
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 engine-ECU
Open circuit between engine-ECU and diagnosis
connector
OK
Check the following connectors: B-09, B-19, B-30, B-35, B-60X,
B-61X
NG
Repair
Check trouble symptom.
NG
Check the harness wire between engine-ECU and diagnosis con-
nector.
OK
Check the harness wire
between engine-ECU
and earth.
NG
Repair
NG
Repair
OK
Check the power supply and ignition switch-IG system.
(Refer to P.13B-41, INSPECTION PROCEDURE 25.)
NOTE
Though the above inspection has been performed, if trouble symptom does not disappear, check the multi
center display, and replace it if necessary.
MPI –
Troubleshooting
13B-41
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 for five seconds 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
MUT-
II
Data list
16 Engine ECU power supply voltage (Refer to P.13B-65.)
NG
Check the engine-ECU power supply and earth circuit.
(Refer to P.13B-59, INSPECTION PROCEDURE 24.)
OK
Measure at the engine-ECU connector B-29.
Disconnect the connector, and measure at the harness side.
Earth the terminal No. 36.
OK: The engine warning lamp illuminates.
OK
Check the following
connector: B-29.
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
NG
Check a burnt-out bulb.
NG
Replace
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 engine warning lamp power supply circuit, and repair
if necessary.
OK
Check the following connectors:
B-01, B-02, B-19, B-29
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between combination meter and engine-
ECU, and repair if necessary.
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
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Measure at the combination meter connector B-02.
Disconnect the connector, and measure at the harness side.
Disconnect the engine-ECU connector
Continuity between 4 and earth
OK: No continuity
NG
Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.
OK
Replace the engine-ECU.
MPI –
Troubleshooting
13B-42
INSPECTION PROCEDURE 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.
Malfunction of the ignition system
Malfunction of the fuel pump system
Malfunction of the injectors
Malfunction of the engine-ECU
Malfunction of the immobilizer system
Foreign materials in fuel
Check battery voltage when cranking.
OK: 8 V or higher
NG
Check the battery. (Refer to GROUP 54 – Battery.)
OK
Is an immobilizer-ECU diagnosis code displayed?
Yes
Check the immobilizer.
(Refer to GROUP 54 – Ignition Key and Immobilizer.)
OK
Can any sound be heard from the injectors when cranking?
NG
Check the injector system. (Refer to P.13B-26, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)
OK
Check the following items.
Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 – On-vehicle service.)
Check if the injectors are clogged.
Check if foreign materials (water, alcohol, etc.) got into fuel.
Check the compression pressure.
Check the immobilizer system. (Refer to GROUP 54 – Ignition Key and Immobilizer.)
No
MUT-
II
Data list
16 Voltage of engine-ECU power source (Refer to P.13B-65.)
NG
Check the power supply and ignition switch-IG system.
(Refer to P.13B-59, INSPECTION PROCEDURE 25.)
OK
Does the camshaft rotate at the engine cranking? (When oil filler
cap is removed.)
No
Check timing belt for breakage.
Yes
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-
II
Data list
22 Crank angle sensor
OK: Cranking speed is displayed.
No
Check the crank angle sensor system. (Refer to P.13B-25, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0335.)
OK
MUT-
II
Actuator test
07 Fuel pump (Refer to P.13B-70.)
NG
Check the fuel pump system. (Refer to P.13B-60, INSPECTION
PROCEDURE 26.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13B-65.)
NG
Check the engine coolant temperature sensor system. (Refer to
P.13B-13, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0115.)
OK
Does the engine tachometer display the cranking speed?
Set the tachometer of primary voltage detection type.
NG
Check the ignition circuit system.
(Refer to P.13B-63, INSPECTION PROCEDURE 31.)
OK
Check the ignition timing when cranking.
OK: Approx. 5
BTDC
NG
Check that the distributor is installed properly.
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