Mitsubishi Space Star. Manual - part 56

MPI  – 

Troubleshooting

13B-11

OK

Check the harness between the
vacuum sensor and the
engine-ECU, and repair if necessary.

From the previous page

OK

Measure at engine-ECU connector
B-31.



Measure the voltage at the
engine-ECU terminal.



Ignition switch: ON



Voltage between terminal 85 and
earth
OK: Altitude 0 m: 3.7 – 4.3 V

Altitude 1200 m: 
3.2  – 3.8 V

NG

Check the following connector:
B-31

NG

Repair

OK

Check the trouble symptoms.

OK

Check the following connector:
B-31

NG

Repair

NG

Replace the engine-ECU.

MPI  – 

Troubleshooting

13B-12

Code No. P0110 Intake air temperature sensor system

Probable cause

Range of Check



Two seconds have passed since the ignition switch is turned ON or the
engine starting process is completed.

Set Conditions



The sensor output voltage is 4.6 V or more for two seconds (equivalent to
–45



C of intake air temperature)

or



The sensor output voltage is 0.2 V or more for two seconds (equivalent to
125



C of intake air temperature)



Malfunction of intake air temperature sensor



Open or short circuit in intake air temperature
sensor or loose connector contact



Malfunction of engine-ECU

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

To the next page

OK

Check the harness between the
intake air temperature sensor and
the engine-ECU.

NG

Repair

NG

Check the following connector:
B-31

NG

Repair

OK

Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.

NG

Repair

OK

Check the following connector:
B-31

(2) NG

Measure at engine-ECU connector
B-31.



Measure the voltage at the
engine-ECU terminal.



Disconnect connector A-95.



Ignition switch: ON



Voltage between terminal 72 and
earth
OK: 4.8  – 5.2 V

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness between the
intake air temperature sensor and
the engine-ECU.

NG

Repair

(1) NG

NG

Repair

Check the following connector:
B-31

OK

Measure at vacuum sensor
connector A-95.



Disconnect the connector and
measure at the harness side.

(1) Resistance between terminal 3

and earth
OK: 2 

Ω

 or less

(2) Voltage between terminal 1 and

earth
(Ignition switch: ON)
OK: 4.8  – 5.2 V

OK

Check following connector: A-95

NG

Repair

NG

Check the intake air temperature
sensor. 
(Refer to P.13B-80.)

NG

Repair

MUT-

II

 Data list

13 Intake air temperature sensor

OK: Roughly the same as am-

bient temperature.

OK

Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

MPI  – 

Troubleshooting

13B-13

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness between the
intake air temperature sensor and
the engine-ECU, and repair if
necessary.

OK

Measure at intake air temperature
sensor connector A-95.



Use the test harness
(MB991348) to connect only
terminals 1 and 3, and then
measure at the pick-up harness.



Ignition switch: ON



Voltage between terminal 1 and
earth
OK: Ambient temperature  0



C:

3.2  – 3.8 V
Ambient temperature 20



C:

2.3  – 2.9 V
Ambient temperature 40



C:

1.5  – 2.1 V
Ambient temperature 80



C:

0.4  – 1.0 V

NG

Check the following connector:
B-31

NG

Repair

From the previous page

Code No. P0115 Engine coolant temperature sensor
system

Probable cause

Range of Check



Engine: Two seconds after the engine has been started

Set Conditions



The sensor output voltage is 4.6 V or more for two seconds (equivalent to
–45



C of engine coolant temperature)

or



The sensor output voltage is 0.1 V or less for two seconds (equivalent to
140



C of engine coolant temperature)



Malfunction of engine coolant temperature sensor



Open or short circuit in the engine coolant
temperature sensor circuit or loose connector
contact



Malfunction of engine-ECU

Range of Check



Engine: After starting

Set Conditions



The engine coolant temperature has reduced from over 40



C to less than

40



C, and that condition has lasted for five minutes or more.

MPI  – 

Troubleshooting

13B-14

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

To the next page

OK

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness wire between
the engine coolant temperature
sensor and the engine-ECU.

NG

Repair

NG

NG

Repair

Check the following connector:
B-31

OK

Check the harness wire between
the engine coolant temperature
sensor and the engine-ECU, and
repair if necessary.

NG

Repair

MUT-

II

 Data list

21 Engine coolant temperature

sensor
OK: When the engine is cold,

the temperature is roughly
the same as ambient tem-
perature. If warm, it is 80
– 120



C.

OK

Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

NG

NG

Replace

OK

Measure at engine coolant
temperature sensor connector A-76.



Disconnect the connector and
measure at the harness side.

(1) Voltage between terminal 1 and

earth
(Ignition switch: ON)
OK: 4.8  – 5.2 V

(2) Resistance between terminal 2

and earth
OK: 2 

Ω

 or less

(1) NG

Measure at engine-ECU connector
B-31.



Measure the voltage at the
engine-ECU terminal.



Disconnect connector A-76.



Ignition switch: ON



Voltage between terminal 83 and
earth
OK: 4.8  – 5.2 V

OK

Check the following connector:
B-31

OK

Check the following connector:
A-76

NG

Repair

(2) NG

OK

Repair

NG

Check the harness wire between
the engine coolant temperature
sensor and the engine-ECU.

NG

Repair

Measure at engine coolant
temperature sensor connector A-76.



Disconnect the connector and
measure at the harness side.



Resistance between terminals 1
and 2
OK: At 20



C of engine coolant

temperature: 2.1 – 2.7 k

Ω

At 80



C of engine coolant

temperature: 0.26 – 0.36
k

Ω

Check the following connector:
B-31