Mitsubishi Space Star. Manual - part 64

MPI  – 

Troubleshooting

13B-43

INSPECTION PROCEDURE 6

Initial combustion but no complete combustion
(starting impossible)

Probable cause

In such cases as the above, the cause is probably that the spark plugs are generating
sparks but the sparks are weak, or the initial mixture for starting is not appropriate.



Malfunction of the ignition system



Malfunction of the injector system



Foreign materials in fuel



Poor compression



Malfunction of the engine-ECU

Check battery voltage when cranking.

OK: 8 V or higher

NG

Check the battery. (Refer to GROUP 54 – Battery.)

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

Is starting good if the engine is cranked with the accelerator pedal
slightly depressed?

Yes

Check ISC servo for op-
eration sound. 
(Refer to P.13B-75*.)

NG

Check the ISC servo system.
(Refer to P.13B-36, INSPEC-
TION PROCEDURE FOR
DIAGNOSIS CODE P0505.)

OK



Clean the throttle valve area. (Refer to P.13B-65*.)

No

Check the ignition timing when cranking.

OK: Approx. 5



BTDC

NG

Check that the distributor is installed properly.

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 the compression pressure. (Refer to GROUP 11B – On-vehicle Service.)



Check fuel lines for clogging.



Check if foreign materials (water, alcohol, etc.) got into fuel.

OK

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

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 DIAGNO-
SIS CODE P0115.)

OK

MUT-

II

 Data list

18 Ignition switch-ST (Refer to P.13B-65.)

NG

Check the ignition switch-ST system. 
(Refer to P.13B-61, INSPECTION PROCEDURE 27.)

NOTE:
*:

Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)

MPI  – 

Troubleshooting

13B-44

INSPECTION PROCEDURE 7

In takes too long time to start. (Incorrect starting)

Probable cause

In cases such as the above, the cause is probably that the spark is weak and
ignition is difficult, the initial mixture for starting is not appropriate, or sufficient
compression pressure is not being obtained.



Malfunction of the ignition system



Malfunction of the injector system



Inappropriate gasoline use



Poor compression

Check battery voltage when cranking

OK: 8 V or higher

NG

Check the battery. (Refer to GROUP 54 – Battery.)

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 ignition timing when cranking.

OK: Approx. 5



BTDC

NG

Check that the distributor is installed properly.

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 the compression pressure. (Refer to GROUP 11B – On-vehicle Service.)



Check if foreign materials (water, alcohol, etc.) got into fuel.

OK

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

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 DIAGNO-
SIS CODE P0115.)

OK

MUT-

II

 Data list

18 Ignition switch-ST (Refer to P.13B-65.)

NG

Check the ignition switch-ST system. 
(Refer to P.13B-61, INSPECTION PROCEDURE 27.)

MPI  – 

Troubleshooting

13B-45

INSPECTION PROCEDURE 8

Unstable idling (Rough idling, hunting)

Probable cause

In cases as the above, the cause is probably that the ignition system, air/fuel mixture,
idle speed control (ISC) or compression pressure is defective.
Because the range of possible causes is broad, inspection is narrowed down to
simple items.



Malfunction of the ignition system



Malfunction of air-fuel ratio control system



Malfunction of the ISC system



Malfunction of the purge control solenoid valve system



Malfunction of the EGR solenoid valve system



Poor compression



Drawing air into exhaust system

Were the battery terminals disconnected?

Yes

After warming-up, let the engine run at idling for 10 minutes.

No

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

Does idling speed fluctuate excessively?

Yes

Check the throttle body. (Refer to P.13B-65*.)

No

Check the ISC servo for operation sound. (Refer to P.13B-75*.)

NG

Check the ISC system. (Refer to P.13B-36, INSPECTION PROCE-
DURE FOR DIAGNOSIS CODE P0505.)

OK

Check the injector for operation sound.

NG

Check the injector system. (Refer to P.13B-26, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)

Check trouble symptom.

NG

Inspect the intake of air into the air intake system.



Broken intake manifold gasket



Broken air intake hose



Broken vacuum hose



Positive crankcase ventilation valve does not operate.

OK

MUT-

II

 Data list

14 Throttle position sensor (Refer to P.13B-65.)

NG

Check the throttle position sensor system. (Refer to P.13B-16,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13B-65.)

NG

Check the intake air temperature sensor system. 
(Refer to P.13B-12, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0110.)

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 DIAGNO-
SIS CODE P0115.)

OK

MUT-

II

 Actuator test

08 Purge control solenoid valve (Refer to P.13B-70.)

NG

Check the purge control solenoid valve system. (Refer to P.13B-34,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0443.)

OK

MUT-

II

 Actuator test

10 EGR control solenoid valve (Refer to P.13B-70.)

NG

Check the EGR control solenoid valve system. (Refer to P.13B-32,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0403.)

OK

MUT-

II

 Data list

59 Oxygen sensor (rear)



Transmission: 2nd gear



Driving with throttle widely open
OK: 600  – 1,000 mV

NG

Check the oxygen sensor (rear) system. (Refer to P.13B-22, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)

OK

MUT-

II

 Data list

11 Oxygen sensor (front)

OK: 600  – 1,000 mV during sudden racing

NG

Check the oxygen sensor (front) system. (Refer to P.13B-19, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)

OK

To next page

NOTE:
*:

Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)

MPI  – 

Troubleshooting

13B-46

OK

Check the ignition timing. 
(Refer to GROUP 11B – On-vehicle Service.)

NG

Check that the distributor is installed properly.

OK

Check the following items.



Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 – On-vehicle Service.)



Check the purge control system. (Refer to GROUP 17 – Emission Control System.)



Check the EGR control system. (Refer to GROUP 17 – Emission Control System.)



Check the compression pressure. (Refer to GROUP 11A – On-vehicle Service.)



Check if foreign materials (water, alcohol, etc.) got into fuel.

From previous page

OK

MUT-

II

 Data list

28 A/C switch (Refer to P.13B-65.)

NG

Check the A/C switch and A/C relay system. 
(Refer to P.13B-62, INSPECTION PROCEDURE 29.)

OK

MUT-

II

 Data list

33 Electrical load switch (Refer to P.13B-65.)

NG

Check the electrical load switch system. 
(Refer to P.13B-62, INSPECTION PROCEDURE 30.)

OK

MUT-

II

 Data list

45 ISC servo position (Refer to P.13B-65.)

NG

Adjust the basic idle speed. (Refer to P.13B-66*.)

OK

MUT-

II

 Data list

11 Oxygen sensor (front)

OK: Changes between 0 – 400 mV and 600 – 1,000 mV

during idling

NG

Check the fuel pressure.
(Refer to P.13B-67*.)

OK

1. Inspect the intake of

air into the air intake
system.



Broken intake man-
ifold gasket



Broken vacuum hose



PCV valve does not
operate.



Broken air intake
hose

2. Check the injector for

clog.

OK

MUT-

II

 Data list

27 Power steering fluid pressure switch (Refer to P.13B-65.)

NG

Check the power steering
fluid pressure switch sys-
tem. (Refer to P.13B-61,
INSPECTION PROCE-
DURE 28.)

NOTE:
*:

Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)