Mitsubishi Space Star. Manual - part 40

 

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Mitsubishi Space Star. Manual - part 40

 

 

GDI  – 

Troubleshooting

GDI  – 

Troubleshooting

13A-87

INSPECTION PROCEDURE 20

Idling speed is improper when A/C is operating

Probable cause

If the engine-ECU <M/T> or engine-A/T-ECU <A/T> detects that the air conditioner
is on, it activates the throttle control servo to control idle-up operation.
The A/C-ECU judges if the load caused by air conditioner operation is high or low,
and converts it to voltage signal (high or low voltage) and inputs the signal to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Based on this voltage signal, the engine-ECU <M/T> or  engine-A/T-ECU <A/T>
controls the idle-up speed (for high or low load).



Malfunction of the A/C control system



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



Malfunction of the engine-ECU <M/T>



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

NG

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

NG

Repair

OK

Check trouble symptom.

Measure at the engine-ECU connector B-86 <M/T> or engine-
A/T-ECU connector B-85 <A/T>.



Connect the connector.



Voltage between 65 <M/T>, 61 <A/T> and earth (Engine: at
idle, outside air temperature: 25



C or more)

OK: 0  – 3 V [When A/C is MAX. COOL condition (when

the load by A/C is high)]
System voltage [When A/C is MAX. HOT condition (when
the load by A/C is low)]

OK

Check the following connector:
B-86 <M/T>, B-85 <A/T>

NG

Check the A/C system. (Refer to GROUP 55 – On-vehicle Service.)

INSPECTION PROCEDURE 21

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

Probable cause

The engine-ECU <M/T> or engine-A/T-ECU <A/T> sends a duty signal to the fan
controller according to engine coolant temperature, vehicle speed, or A/C switch
load.
The fan controller controls radiator fan and condenser fan speeds, based on this
signal. (The closer the terminal voltage comes to 5 V, the higher the fan speed
becomes.)



Malfunction of the fan motor relay



Malfunction of the fan motor



Malfunction of the fan controller



Open or short circuit, or poor connector contact



Malfunction of the engine-ECU <M/T>



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

OK

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

OK

Check the thermostat.

NG

Replace

NG

MUT-

II

 Data list

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

temperature during idling is identical to the MUT-

II

 reading.

NG

Check the engine coolant temperature sensor system. (Refer to
P.13A-19, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
0115.)

NG

Repair

OK

Check trouble symptom.

OK

Check the following connector: B-84

NG

Repair

OK

Check the radiator fan and condenser fan circuit. (Refer to GROUP
14  – Troubleshooting.)

NG

Check the harness wire between the engine-ECU <M/T> or engine-
A/T-ECU <A/T> and fan controller.

NG

Repair

OK

Check trouble symptom.

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



Disconnect the connector, measure at the harness side.



Voltage between terminal 18 and earth
(Ignition switch: ON)
OK: 4.8  – 5.2 V (The fan runs at high speed.)



Earth terminal 18.
(Ignition switch: ON)
OK: The fan stops.

NG

Check the following connectors: A-23, A-32

GDI  – 

Troubleshooting

13A-88

INSPECTION PROCEDURE 22

Clutch switch system malfunction <M/T>

Probable cause

The clutch pedal switch sends a signal indicating clutch pedal depression to the
engine-ECU. The engine-ECU controls the fuel injection properly according to this
signal, thus prevents the fluctuation of the engine speed during shift change.



Malfunction of the clutch switch



Open circuit or short-circuited harness wire in the
clutch switch circuit



Malfunction of the engine-ECU

NG

Replace the engine-ECU.

NG

OK

Check the trouble symptoms.

OK

Replace the engine-ECU.

Repair

NG

Repair

NG

Repair

(2) NG

OK

Check the following connector:
B-96

Check the harness wire between the
clutch switch connector and the earth,
and repair if necessary.

Check the trouble symptoms.

Check the harness wire between the
engine-ECU and the clutch switch con-
nector.

Measure at the clutch switch connector
B-96.



Disconnect the connector, and
measure at the harness side.

(1) Voltage between 2 and earth

(Ignition switch: ON)
OK: System voltage

(2) Continuity between 1 and earth

OK: Continuity

(1) NG

Check the following connectors:
B-19, B-86, B-96

OK

NG

Replace

OK

Check the clutch switch. (Refer to
P.13A-109*.)

NG

NOTE
*:

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

INSPECTION PROCEDURE 23

GDI ECO indicator lamp does not illuminate.

Probable cause

If the GDI ECO indicator lamp does not illuminate after turning switch, the causes
listed in the right column are suspected.



Burned-out GDI ECO indicator lamp bulb



Open circuit or short-circuited harness wire in the
GDI ECO indicator lamp circuit



Malfunction of the engine-ECU <M/T>



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

Check the GDI ECO indicator lamp circuit, and repair if necessary.

OK

NG

Repair

NG

Check a burned-out bulb.

NG

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

OK

Check trouble symptom.

NG

Repair

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



Disconnect the connector, and measure at the harness side.



Earth terminal 14 <M/T>, 23 <A/T> (Ignition switch: ON)
OK: The GDI ECO indicator lamp illuminates.

OK

Check the following connector: B-84

NG

Check the harness wire between the combination meter and en-
gine-ECU<M/T> or engine-A/T-ECU<A/T> and  repair if necessary.

OK

Check trouble symptom.

NG

Repair

Check the following connectors: B-02, B-19, B-84

OK

Measure at combination meter B-01.



Disconnect the connector, and measure at the harness side.



Voltage between terminal 49 and earth (Ignition switch: ON)
OK: System voltage

GDI  – 

Troubleshooting

13A-89

INSPECTION PROCEDURE 24

GDI ECO indicator lamp remains illuminated and does
not go off.

Probable cause

If the GDI ECO indicator lamp does not go off during high load operation, the causes
listed in the right column are suspected.



Short circuit between the GDI ECO indicator lamp
and engine-ECU



Malfunction of the engine-ECU <M/T>



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

OK

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

Measure at combination meter connector B-02.



Disconnect the connector, and measure at the harness side.



Disconnect the engine-ECU connector B-84 <M/T> or
engine-A/T-ECU connector B-84 <A/T>.



Continuity between terminal 11 and earth
OK: No continuity

NG

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

GDI  – 

Troubleshooting

13A-90

INSPECTION PROCEDURE 25

Engine-ECU (engine-A/T-ECU) power supply and earth
circuit system

Probable cause

The cause is probably a malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T> or one of the problems listed at right.



Open circuit or short-circuited harness wire in the
engine-ECU <M/T>or engine-A/T-ECU <A/T>
power supply circuit



Open circuit or short-circuited harness wire in the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
earth 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.)

(2), (3) NG

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

(4) NG

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

(5) NG

NG

Repair

OK

Check the trouble symptoms.

NG

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

NG

Repair

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the following connectors:
B-86, B-87

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

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and ignition switch, and
repair if necessary.

Measure at the engine-ECU connectors
B-86, B-87.



Disconnect the connector, and
measure at the harness side.

(1) Voltage between 99 and earth

(Ignition switch: ON)
OK: System voltage

(2) Voltage between 57 and earth

OK: System voltage

(3) Voltage between 47, 59 and

earth (Ignition switch: ON)
OK: System voltage (When ter-

minal 57 is shorted to
earth)

(4) Continuity between 46, 58 and

earth
OK: Continuity

(5) Voltage between 60 and earth

OK: System voltage

(1) NG

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

NG

Repair

 

 

 

 

 

 

 

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