Mitsubishi Space Star. Manual - part 67

MPI  – 

Troubleshooting

13B-55

INSPECTION PROCEDURE 19

Surge

Probable cause

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



Malfunction of the ignition system



Malfunction of air-fuel ratio control system



Malfunction of the EGR control solenoid valve 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 P020, 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.)

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)

MPI  – 

Troubleshooting

13B-56

INSPECTION PROCEDURE 20

Knocking

Probable cause

In cases as the above, the cause is probably that the detonation control is defective
or the heat value of the spark plug is inappropriate.



Defective detonation sensor



Inappropriate heat value of the spark plug

Check the following items.



Spark plugs



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

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

No

Does knocking occur when driving with the detonation sensor
connector disconnected? At this time, use the MUT-

II

 to check

if the timing is retarded compared to when the detonation sensor
connector is disconnected.

No

Check the detonation sensor system. (Refer to P.13B-29, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)

Yes

INSPECTION PROCEDURE 21

Dieseling

Probable cause

Fuel leakage from injectors is suspected.



Fuel leakage from injectors

Check the injectors for fuel leakage.

MPI  – 

Troubleshooting

13B-57

INSPECTION PROCEDURE 22

Too high CO and HC concentration when idling

Probable cause

Abnormal air-fuel ratio is suspected.



Malfunction of the air-fuel ratio control system



Deteriorated catalyst

Check trouble symptom.

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

NG

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

OK

NG

Check the trouble symptom.

NG

Replace the catalytic converter.

No

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

NG

Check that the distributor is installed properly.

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

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

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 when racing suddenly

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: Repeat 0 – 400 mV and 600 – 1,000 mV alternately

when idling.

OK

Replace the oxygen sensor.

Check the following items.



Check the injectors for operation sound.



Check the injectors for fuel leakage.



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 positive crankcase ventilation system. (Refer to GROUP 17 – Emission Control System.)



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



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

NOTE:
*:

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

MPI  – 

Troubleshooting

13B-58

INSPECTION PROCEDURE 23

Fans (radiator fan, A/C condenser fan) are inoperative.

Probable cause

The fan motor relay is controlled by the power transistor inside the engine-ECU
turning ON and OFF.



Malfunction of the fan motor relay



Malfunction of the fan motor



Malfunction of the thermostat



Improper connector contact, open circuit or
short-circuited harness wire



Malfunction of the engine-ECU

OK

Check the trouble symptoms.

OK

Check the following connector: B-28

NG

Repair

Measure at the engine-ECU connector B-28.



Disconnect the connector, and measure at the harness side.



Check the condition of the fans (radiator fan and A/C condenser
fan). (Ignition switch: ON)
OK: Fans are stopped



Voltage between 20 and earth, 21 and earth 
(Ignition switch: ON)
OK: System voltage



Connect a jumper wire between 20 and earth 
(Ignition switch: ON)
OK: Radiator fan and condenser fan run at high speed.



Connect a jumper wire between 21 and earth 
(Ignition switch: ON)
OK: Radiator fan and condenser fan run at low speed.

NG



Check the radiator fan circuit. (Refer to ELECTRICAL WIRING.)



Check the A/C condenser fan circuit. 
(Refer to ELECTRICAL WIRING.)

NG

MUT-

II

 Data list

21 Engine coolant temperature sensor
OK: After the engine has warmed up, the engine coolant tempera-

ture durning idling is identical to the MUT-

II

 reading.

NG

Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)

OK

Replace the engine-ECU.

OK

Check the thermostat.

NG

Replace