Mitsubishi Space Star. Manual - part 39

GDI  – 

Troubleshooting

13A-83

NG

Replace the injector.

OK

Check all the following items:



Spark plug



EGR system



Compression pressure



Clogged fuel filter, fuel line

Check trouble symptom.

OK

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

NG

Replace the ignition coil.

OK

Measure high fuel pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-124.)

NG

Repair

From the previous page

INSPECTION PROCEDURE 14

The feeling of impact when accelerating

Probable cause

The cause is probably an ignition leak being generated in line with an increase
in the spark plug request voltage during acceleration.



Malfunction of the ignition system

NG

Replace the ignition coil.

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

OK

Check all the following items:



Spark plug



Ignition current leak

No

MUT-

II

 Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-99.)

NG

Check the throttle valve position feedback system. 
(Refer to P.13A-58, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P1221.)

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

(Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.)

GDI  – 

Troubleshooting

13A-84

INSPECTION PROCEDURE 15

The feeling of impact when decelerating

Probable cause

The cause is probably insufficient intake air due to a faulty electronic-controlled
throttle valve system.



Malfunction of the electronic-controlled throttle valve
system

OK

MUT-

II

 Data list

26 Accelerator pedal position switch (Refer to P.13A-99.)

NG

Check the accelerator pedal position switch system. 
(Refer to P.13A-94, INSPECTION PROCEDURE 29.)

No

MUT-

II

Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-99.)

NG

Check the throttle valve position feedback system. 
(Refer to P.13A-58, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P1221.)

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

(Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.)

OK

Clean around the throttle valve. (Refer to P.13A-96*.)

NOTE
*:

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

INSPECTION PROCEDURE 16

Knocking

Probable cause

The cause is probably incorrect detonation control or improper heat range of the
spark plugs.



Malfunction of the detonation sensor



Improper heat range of the spark plugs

Yes

Check all the following items:



Spark plug



Foreign material (such as water or kerosine) entered the fuel
lines

No

Does knocking occur when the vehicle is driven with the detonation
sensor disconnected?
(At this time, use the MUT-

II

 to check whether the ignition timing

is retarded from when the detonation sensor connector is con-
nected.)

No

Check the detonation sensor system. (Refer to P.13A-48, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

(Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.)

INSPECTION PROCEDURE 17

Run-on (dieseling)

Probable cause

The cause is probably fuel leak from injector(s)



Malfunction of the injector

Replace the injector.

GDI  – 

Troubleshooting

13A-85

INSPECTION PROCEDURE 18

Too high CO and HC concentration when idling

Probable cause

The cause is probably an incorrect air/fuel ratio



Malfunction of air/fuel ratio control system



Deterioration of the catalyst

OK

To the next page

OK

Check all the following items:



Spark plug



EGR system



Compression pressure



Clogged fuel filter or line

NG

Replace the ignition coil.

NG

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

NG

Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-124.)

NG

Repair

Check trouble symptom.

OK

MUT-

II

 Data list

11 Oxygen sensor (front)

OK: 0  – 400 mV and 600 – 1,000 mV alternates when the

engine is idling (wait for four minutes after the engine
started).

OK

Replace the oxygen sensor (front).

OK

NG

Check the oxygen sensor (front) system. (Refer to P.13A-26, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)

MUT-

II

 Data list

11 Oxygen sensor (front)

OK: 600  – 1,000 mV when the engine is suddenly raced

OK

MUT-

II

 Data list

59 Oxygen sensor (rear)



Transmission: 2nd gear <M/T>, L range <A/T>



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

NG

Check the oxygen sensor (rear) system. (Refer to P.13A-29, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)

OK

MUT-

II

 Data list

25 Barometric pressure sensor (Refer to P.13A-99.)

NG

Check the barometric pressure sensor. (Refer to P.13A-16, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13A-99.)

NG

Check the intake air temperature sensor. (Refer to P.13A-18, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0110.)

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor (Refer to P.13A-99.)

NG

Check the engine coolant temperature sensor. (Refer to P.13A-19,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0115.)

No

Check ignition timing. (Refer to GROUP 11A – Engine Adjustment.)

NG

Check that the crank angle sensor and timing belt cover are proper-
ly installed.

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

(Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.)

GDI  – 

Troubleshooting

13A-86

NG

Replace the three-way catalytic converter.

Check trouble symptom.

NG

Replace the injector.

OK

Check trouble symptom.

OK

MUT-

II

 Actuator test

08 Purge control solenoid valve (Refer to P.13A-105.)

NG

Check purge control solenoid valve system. (Refer to P.13A-55,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0443.)

OK

MUT-

II

 Data list

68 EGR valve (Refer to P.13A-99.)

NG

Check the EGR valve system. (Refer to P.13A-52, code No.
P0403.)

From the previous page

INSPECTION PROCEDURE 19

Low alternator output voltage (approx. 12.3 V)

Probable cause

The cause is probably a malfunction of the alternator or one of the problems
listed at right.



Malfunction of the charging system



Open circuit between the alternator G terminal
and the engine-ECU <M/T> or engine-A/T-ECU
<A/T>



Malfunction of the engine-ECU <M/T>



Malfunction of the engine-A/T-ECU <A/T>

NG

Repair

OK

Replace the engine-ECU <M/T> or en-
gine-A/T-ECU <A/T>.

OK

Check the alternator. (Refer to GROUP
16  – Charging System.)

OK

Check the following connectors:
A-75, A-93, B-84

Measure at the alternator connector
A-93.



Connect the connector. (Use the
test harness MB991519)



Voltage between 1 (black clip)
and earth
(Engine: Idling)
(Radiator fan: Not operating)
(Headlamp: OFF 

→

 ON)

(Stop lamp: OFF 

→

 ON)

(Rear defogger switch: OFF 

→

ON)
OK: Voltage increased by 

0.2  – 3.5 V.

NG

Measure at the alternator connector
A-93.



Disconnect the connector, and
measure at the harness side.



Disconnect the engine-ECU
connector <M/T> or
engine-A/T-ECU connector <A/T>.



Continuity between 1 and earth
OK: No continuity

NG

Check the harness wire between
the alternator and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.