Mitsubishi Space Star. Manual - part 41

GDI  – 

Troubleshooting

13A-91

<A/T>

Replace the engine-A/T-ECU.

NG

OK

NG

Repair

Check the trouble symptoms.

NG

Check the harness wire between the engine-A/T-ECU and the
battery, and repair if necessary.

OK

NG

Repair

Check the trouble symptoms.

(5) NG

Check the following connectors::  B-18, B-45

(4)  NG

Check the harness wire between the engine-A/T-ECU and the
earth, and repair if necessary.

(2), (3) NG

Check the harness wire between the engine-A/T-ECU and the
engine control relay, and repair if necessary.

OK

NG

Repair

Check the ignitio switch. (Refer to GRUOP 54 – Ignition Switch.)

NG

Check the harness wire between engine-A/T-ECU and ignition
switch.

OK

NG

Repair

OK

Measure at the engine-A/T-ECU connector B-85, B-86.



Disconnect the connector, and measure at the harness side.

(1) Voltage betwee4n 98 and earth

(Ignition switch: ON)
OK: System voltage

(2) Voltage between 49 and earth

OK: System voltage

(3) Voltage between 41, 47 and earth (Ignition switch: ON)

OK: System voltage (When terminal 49 is shorted to

earth)

(4) Continuity between 42, 48 and earth

OK: Continuity

(5) Voltage between 66 and earth

OK: System voltage

(1) NG

Check the following connectors:  B-18, B-58

Check the following connectors:  B-85, B-86

Check the trouble symptoms.

INSPECTION PROCEDURE 26

Engine control relay and ignition switch-IG system

Probable cause

When the ignition switch ON signal is input to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, the engine-ECU <M/T> or engine-A/T-ECU <A/T> turns
on the engine control relay.
This causes system voltage to be supplied to the engine-ECU <M/T> or
engine-A/T-ECU <A/T> and to the sensors and actuators.



Malfunction of the ignition switch



Malfunction of the engine control relay



Open circuit or short-circuited harness wire of the
engine control relay circuit



Malfunction of the engine-ECU <M/T>



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

Check the harness wire between the
battery and the engine control relay,
and repair if necessary.

OK

Check the engine-ECU
(engine-A/T-ECU)  power supply and
earth circuit system.
(Refer to P.13A-90, INSPECTION
PROCEDURE 25.)

OK

Measure at the engine control relay
connector B-26.



Disconnect the connector, and
measure at the harness side.



Voltage between 3, 4 and earth
OK: System voltage

NG

Check the engine control relay. (Refer
to P.13A-105*.)

NG

Replace

NOTE
*:

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

GDI  – 

Troubleshooting

13A-92

INSPECTION PROCEDURE 27

Injector driver relay system

Probable cause

When the ignition switch ON signal is input to the engine-ECU <M/T> or the
engine -A/T-ECU <A/T>, engine-ECU <M/T> or the engine -A/T-ECU <A/T>
turns on the injector driver relay.
This causes system voltage to be supplied to the injector driver.



Malfunction of the injector driver relay



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



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

NG

Check the harness wire between the injector driver relay and
the injector driver, repair if necessary.

Check the injector driver system.
(Refer to P.13A-56, INSPECTION PROCEDURE FOR
DIAGNOSIS CODE P1200.)

OK

OK

NG

Repair

Check the troble symptoms.

NG

Check the following connector: A-53

NG

Measure at the injector driver connector A-52.



Connect the connector.



Voltage between 12, 21 and earth (Ignition switch: ON)
OK: System voltage

OK

NG

Repair

Check the troble symptoms.

OK

Check the following connectors: B-86 <M/T>, B-84 <A/T>

NG

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

OK

NG

Repair

Check the troble symptoms.

NG

Check the following connector: A-53

OK

Measure at the engine-ECU connector B-84 <M/T> or
engine-A/T-ECU connector B-86 <A/T>.



Disconnect the connector, and measure at the harness side.



Voltage between 55 <M/T> ,  6<A/T> and earth 
(Ignition switch: ON)
OK: System voltage

OK

NG

Check the harness wire between the injector driver relay and
the ignition switch, repair if necessary.

OK

NG

Repair

Check the troble symptoms.

(2) NG

Check the following connectors: B-18, B-58

(1) NG

Check the harness wire between the injector driver relay and
the battery, repair if necessary.

Measure at the injector driver relay connector A-53.



Disconnect the connector, and measure at the harness side.

(1) Voltage between 1 and earth

OK: System voltage

(2) Voltage between 3 and earth (Ignition switch: ON)

OK: System voltage

Check the injector driver relay. (Refer to P.13A-105*.)

NG

Replace

NOTE
*:

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

GDI  – 

Troubleshooting

13A-93

INSPECTION PROCEDURE 28

Ignition switch-ST system

Probable cause

The ignition switch-ST outputs a HIGH signal to the engine-ECU <M/T> or
engine-A/T-ECU <A/T> while the engine is cranking.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> uses this signal to carry out
functions such as fuel injection control during starting.



Malfunction of the ignition switch



Malfunction of the inhibitor switch <A/T>



Open circuit or short-circuited harness wire of the
ignition switch circuit



Malfunction of the engine-ECU <M/T>



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

<M/T>

NG

Repair

OK

Check the ignition switch. (Refer to
GROUP 54.)

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the following connector:
B-86

NG

Repair

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and the ignition switch.

Measure at the engine-ECU connector
B-86.



Disconnect the connector, and
measure at the harness side.



Voltage between 68 and earth
(Ignition switch: START)
OK: 8 V or more

NG

Check the following connectors:
B-18, B-58

NG

Repair

<A/T>

OK

NG

Repair

Check the ignition switch.
(Refer to GROUP 54 – Ignition Switch.)

Replace the engine-A/T-ECU.

NG

OK

NG

Repair

Check the trouble symptoms.

OK

Check the following connector: B-85

NG

Check the harness wire between the inhibitor switch and the
engine-A/T-ECU, repair if necessary.

OK

NG

Repair

Check the trouble symptoms.

NG

Check the following connector: A-99

OK

Measure at the engine-A/T-ECU connector B-85.



Disconnect the connector, and measure at the harness side.



Voltage between 58 and earth 

(

Selector lever position: P or N)

(

Ignition switch: START)

OK: System voltage

OK

NG

Check the harness wire between the inhibitor switch and the ignition
switch.

OK

NG

Repair

Check the trouble symptoms.

NG

Check the following connectors: B-18, B-58

Measure at the inhibitor switch connector A-99.



Disconnect the connector, and measure at the harness side.



Voltage between 10 and earth (Ignition switch: START)
OK: System voltage

Check the inhibitor switch.



Continuity between terminal 9 and 10 
(Refer to GROUP 23 – On-vehicle Service)

NG

Replace

GDI  – 

Troubleshooting

13A-94

INSPECTION PROCEDURE 29

Accelerator pedal position switch system

Probable cause

The accelerator pedal position switch detects that the accelerator pedal is fully closed,
and sends a signal to the engine-ECU <M/T> or engine-A/T-ECU <A/T>. The
engine-ECU <M/T> or engine-A/T-ECU <A/T> controls idle speed, based on this
signal.



Maladjustment of the accelerator cable



Maladjustment of the accelerator pedal position switch



Open circuit or short-circuited harness wire in the
accelerator pedal position switch system, or poor
connector contact



Malfunction of the engine-ECU <M/T>



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

NG

Repair

NG

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

OK

NG

Repair

Check the accelerator pedal position switch. (Refer to P.13A-127.)

NG

Replace the accelerator pedal position sensor assembly.

OK

Measure at accelerator pedal position sensor connector B-94.



Disconnect the connector, and measure at the harness side.



Voltage between terminal 4 and earth
(Ignition switch: ON)
OK: 4 V or more



Continuity between terminal 5 and earth
OK: Continuity

NG

Check the following connectors: B-87 <M/T>, B-86 <A/T>

OK

Check trouble symptom.

NG

Check the harness wire between the engine-ECU <M/T> or engine-
A/T-ECU <A/T> and accelerator pedal position sensor.

OK

Check the following connector: B-94

NG

Repair

OK

Check trouble symptom.