Mitsubishi Space Star. Manual - part 66

 

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Mitsubishi Space Star. Manual - part 66

 

 

MPI  – 

Troubleshooting

13B-51

INSPECTION PROCEDURE 13

The engine stalls when starting the car. (Pass out)

Probable cause

In cases such as the above, the cause is probably misfiring due to a weak spark,
or an inappropriate air/fuel mixture when the accelerator pedal is depressed.



Drawing air into intake system



Malfunction of the ignition system

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

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

Check the following items.



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



Check if air was drawn into the intake system.

Broken intake manifold gasket
Broken or disconnected vacuum hose
Improper operation of the PCV valve
Broken air intake hose

INSPECTION PROCEDURE 14

The engine stalls when decelerating.

Probable cause

In cases such as the above, the cause is probably that the intake air volume is
insufficient due to a defective idle speed control (ISC) servo system.



Malfunction of the ISC 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

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

45 ISC servo position



Is the idle speed control (ISC) servo position drops to 0–2
steps when decelerating (engine r/min less than 1,000)?

Yes

Check the vehicle speed sensor system. (Refer to P.13B-35, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0500.)

No

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 DIAGNO-
SIS CODE P0403.)

OK

Check the following items.



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



Clean the throttle valve area.

MPI  – 

Troubleshooting

13B-52

INSPECTION PROCEDURE 15

Hesitation, sag or stumble

Probable cause

In cases such as the above, the cause is probably that ignition system, air/fuel
mixture or compression pressure is defective.



Malfunction of the ignition system



Malfunction of air-fuel ratio control system



Malfunction of the fuel supply system



Malfunction of the EGR control solenoid valve system



Poor compression

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

No

Check the injectors for operation sound.

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

NG

Check that the distributor is installed properly.

OK

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

OK

Check the following items.



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



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



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



Check the fuel filter or fuel line for clogging.

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 DIAGNOSIS 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

 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

 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

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.

NOTE:
*:

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

MPI  – 

Troubleshooting

13B-53

INSPECTION PROCEDURE 16

The feeling of impact or vibration when accelerating

Probable cause

In cases such as the above, the cause is probably that there is an ignition leak
accompanying the increase in the spark plug demand voltage during acceleration.



Malfunction of the ignition system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

No

Check the following items.



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



Check for occurrence of ignition leak.

INSPECTION PROCEDURE 17

The feeling of impact or vibration when decelerating.

Probable cause

Malfunction of the ISC system is suspected.



Malfunction of the ISC system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

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

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

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

NOTE:
*:

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

MPI  – 

Troubleshooting

13B-54

INSPECTION PROCEDURE 18

Poor acceleration

Probable cause

Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc.
are suspected.



Malfunction of the ignition system



Malfunction of air-fuel ratio control system



Malfunction of the fuel supply system



Poor compression pressure



Clogged exhaust system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

No

Check the injectors for operation sound.

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

NG

Check that the distributor is installed properly.

OK

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

OK

Check the following items.



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



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



Check the fuel filter or fuel line for clogging.



Broken air intake hose



Clogged air cleaner

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

 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

 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

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.

NOTE:
*:

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

 

 

 

 

 

 

 

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