Mitsubishi Space Star. Manual - part 80

DIESEL FUEL – 

Troubleshooting

13D-19

Code No. 23 EGR valve position sensor system

Probable cause

Range of Check



Ignition switch: ON

Set Conditions



Sensor output voltage is 250 mV or less for 1 second

or



Sensor output voltage is 4,700 mV or more for 1 second

Range of Check



Ignition switch: OFF 

→

 ON

Set Conditions



Sensor output voltage is 1,500 mV or more for 1 second



Malfunction of the EGR valve position sensor



Improper connector contact, open circuit or
short-circuited harness wire of the EGR valve
position sensor circuit



Malfunction of the engine-ECU

NG

Check the following connector: A-121

NG

OK

Measure at the EGR valve connector A-110.



Disconnect the connector and measure at the harness
side.



Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8  – 5.2 V



Continuity between 2 and earth
OK: Continuity

OK

NG

Check the harness wire between the EGR valve position
sensor and the engine-ECU.

Repair

Check the following connectors: A-110, A-121

OK

Check the EGR valve position sensor 
(Refer to GROUP 17 – Emission Control System.)

OK

Check trouble symptom.

Repair

NG

Replace the engine-ECU.

OK

INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*

MUT-

II

 Data list

15 EGR valve position sensor (Refer to P.13D-46.)

OK

Repair

NG

Replace the engine-ECU.

NG

Check trouble symptom.

NG

Replace the EGR valve.

Check the harness wire between the EGR valve position
sensor and the engine-ECU (sensor signal line).

OK

NG

Repair

NG

*:

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

DIESEL FUEL – 

Troubleshooting

13D-20

Code No. 24 Glow relay box system

Probable cause

Range of Check



Ignition switch: OFF

→

ON

Set Conditions



Trouble signal input from the glow relay box



Malfunction of the glow relay box



Improper connector contact, open circuit or
short-circuited harness wire of the glow relay box
circuit



Malfunction of the engine-ECU

OK

NG

Check the harness wire between the power supply and the
glow relay box, and repair if necessary.

OK

Measure at the glow relay box connector A-111.



Disconnect the connector and measure at the harness
side.



Voltage between 7 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the following connectors: A-105, A-106, A-111,
A-123, A-124

OK

Replace the engine-ECU.

INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*

MUT-

II

 Actuator test

09 Glow relay box (Refer to P.13D-50.)

Check trouble symptom.

NG

Check the harness wire between the glow relay box and the
engine-ECU.

OK

Repair

NG

Repair

NG

OK

Check the harness wire between the glow relay box and the
glow plug.

NG

Check trouble symptom.

Check the glow plug. (Refer to GROUP 16 – Glow system.)

Replace

NG

Repair

NG

Replace the glow relay box.

OK

Check the following connector: A-121

Repair

NG

OK

*:

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

DIESEL FUEL – 

Troubleshooting

13D-21

Code No. 25 Immobilizer system

Probable cause

Range of Check



Ignition switch: ON

Set Conditions



Improper communication between the engine-ECU and Immobilizer-ECU



Malfunction of the immobilizer-ECU



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



Malfunction of the engine-ECU

YES

Check the immobilizer system (Refer to GROUP 54 – Ignition
Switch and Immobilizer System.)

Is a diagnosis code output from the immobilizer-ECU?

Check the following connectors: A-122, B-19, B-36

OK

Check trouble symptom.

Check the harness wire between the immobilizer–ECU and
the engine-ECU.

OK

Repair

NG

Repair

NG

NO

Replace the engine-ECU.

NG

NOTE
If the engine-ECU is replaced, the immobilizer-ECU and ignition key should be replaced together with it.

DIESEL FUEL – 

Troubleshooting

13D-22

Code No. 26 EGR valve system

Probable cause



Malfunction of the EGR valve



Improper connector contact, open circuit or
short-circuited harness wire of the EGR valve
circuit



Malfunction of the engine-ECU

NG

NG

OK

Measure at the EGR valve connector A-110.



Disconnect the connector and measure at the harness
side.



Voltage between 6 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the following connectors: A-110, A-121

OK

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

Replace the engine-ECU.

OK

INTERMITTENT MALFUNCTIONS
Refer to GROUP 00 – Points to Note for Intermittent
Malfunctions*

MUT-

II

 Actuator test

08 EGR valve (Refer to P.13D-50.)

Check the harness wire between the EGR valve and the main
relay, and repair if necessary.

Check trouble symptom.

NG

Repair

NG

OK

Replace the EGR valve.

Check the harness wire between the EGR valve and the
engine-ECU.

OK

Repair

NG

*:

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