Mitsubishi Space Star. Manual - part 45

GDI  – 

Troubleshooting

13A-107

Terminal No.

Normal condition

Check requirements (engine condition)

Check item

18

Fan controller

Radiator and condenser fans are not
operating.

0 – 0.3 V

Radiator and condenser fans are
operating.

0.7 V or more

20

A/C relay



Engine: Idling



A/C switch: OFF 

→

 ON 

(Compressor is operating)

System voltage, or changes
from momentarily 6 V or
more to 0 

→

3 V

21

Fuel pump relay

Ignition switch:
ON

Engine: Stopped

System voltage

ON

Engine: Idling

0 – 3 V

31

Engine warning lamp

Ignition switch: OFF 

→

 ON

0 – 3 V 

→

System voltage

(after several seconds)

41

Sensor power supply

Ignition switch: ON

4.5 – 5.5 V

42

Power supply to
accelerator pedal position
sensor (1st channel)

Ignition switch: ON

4.5 – 5.5 V

43

Crank angle sensor

Engine: Cranking

0.4 – 4.0 V

Engine: Idling

1.5 – 2.5 V

44

Engine coolant tempera-
ture sensor

Ignition switch:
ON

Engine coolant
temperature: 0



C

3.2 – 3.5 V

Engine coolant
temperature:
 20



C

2.3 – 2.9 V

Engine coolant
temperature:
 40



C

1.5 – 2.1 V

Engine coolant
temperature:
80



C

0.4 – 1.0 V

45

Engine ignition signal

Engine: 3,000 r/min

0.3 – 3.0 V

47

Power supply

Ignition switch: ON

System voltage

59

50

Camshaft position sensor

Engine: Cranking

0.4 – 3.0 V

Engine: Idling

0.5 – 2.0 V

51

Barometric pressure
sensor

Ignition switch:
ON

Altitude: 0 m

3.7 – 4.3 V

sensor

ON

Altitude: 1,200 m

3.2 – 3.8 V

52

Alternator FR terminal



Engine: Warm up, and then idling



Radiator fan: Not operating



Headlamp: OFF 

→

 ON



Stop lamp: OFF 

→

 ON



Rear defogger: OFF 

→

 ON

Voltage decreases

GDI  – 

Troubleshooting

13A-108

Terminal No.

Normal condition

Check requirements (engine condition)

Check item

53

Oxygen sensor (rear)



Transmission: 2nd gear



Engine speed: 3,500 r/min or more



Driving with the throttle valve widely
open

 0.6 – 1.0 V

54

Power steering fluid
pressure switch

Engine: Warm
up, and then
idling

Steering wheel
stationary

System voltage

idling

Steering wheel
turning

0 – 3 V

55

Injector driver relay

Ignition switch: OFF

0 – 0.1 V

Ignition switch: ON

0.5 – 1.0 V

56

Throttle valve control
servo relay

Ignition switch: OFF

0 – 0.3 V

servo relay

Ignition switch: ON

0.5 – 1.0 V

57

Engine control relay

Ignition switch: OFF

0 – 3 V

Ignition switch: ON

System voltage

60

Back-up power source

Ignition switch: OFF

System voltage

61

Air flow sensor

Engine: Idling

2.2 – 3.2 V

Engine: 2,500 r/min

62

Intake air temperature
sensor

Ignition switch:
ON

Intake air temper-
ature:  0



C

3.2 – 3.8 V

Intake air temper-
ature: 20



C

2.3 – 2.9 V

Intake air temper-
ature: 40



C

1.5 – 2.1 V

Intake air temper-
ature: 80



C

0.4 – 1.0 V

63

Stop lamp switch

Depress the brake pedal.

System voltage

Release the brake pedal.

0 – 3 V

65

A/C switch (2nd channel)

Refer to GROUP 55 – Troubleshooting “Check at the A/C-ECU
terminal, engine-ECU output terminals.”

66

Clutch switch

Depress the clutch pedal.

0 – 3 V

Release the clutch pedal.

System voltage

68

Ignition switch-ST

Engine: Cranking

8 V or more

71

Oxygen sensor (front)

Engine: Warm up, and then hold the
engine speed at 2,500 r/min (Use a
digital voltmeter).

0 

↔

 0.8 V alternates.

73

M/T oil temperature
sensor

M/T oil temperature: 25



C

2.4 – 2.7 V

sensor

M/T oil temperature: 80



C

0.5 – 0.8 V

GDI  – 

Troubleshooting

13A-109

Terminal No.

Normal condition

Check requirements (engine condition)

Check item

74

Brake vacuum sensor

Engine: Stop the engine from idle
speed, turn the ignition switch ON,
and then depress the brake pedal
several times.

Voltage increases

76

Air flow sensor reset
signal

Engine: Idling

0 – 1 V

signal

Engine: 3,000 r/min

6 – 9 V

78

Throttle position sensor
(2nd channel)

Ignition switch:
ON

Release the
accelerator pedal.

4.5 – 5.5 V

Depress the
accelerator pedal
fully.

0.4 – 0.6 V

79

Accelerator pedal position
switch

Ignition switch:
ON

Release the
accelerator pedal.

0 – 1 V

Depress the
accelerator pedal
fully.

4 V or more

80

Vehicle speed sensor



Ignition switch: ON



Move the vehicle forward.

 0 

↔

 system voltage

alternates.

83

A/C switch (1st channel)

Engine: Idling

A/C switch: OFF

0 – 3 V

A/C switch: ON
(Compressor is
operating)

System voltage

88

Small lamp switch

Lighting switch: OFF

0 – 3 V

Lighting switch: ON (Taillamp: ON)

System voltage

89

Oxygen sensor heater
(front)

Engine: Idling

0 – 3 V

(front)

Engine: 3,500 r/min

System voltage

90

Oxygen sensor heater
(rear)

Engine: Idling

0 – 3 V

(rear)

Engine: 3,500 r/min

System voltage

92

Fuel pressure sensor

Engine: Idling

0.3  – 4.7 V

94

Accelerator pedal position
sensor (1st channel)

Ignition switch:
ON

Release the acceler-
ator pedal.

0.985  – 1.085 V

*

1

Depress the
accelerator pedal
fully.

4 V or more

*

2

96

Injector open circuit check
signal

Engine: Increase engine speed from
idle speed to 4,000 r/min.

Decreases slightly (approx.
0.7 V) from 4.5 V – 5.0 V.

99

Ignition switch-IG

Ignition switch: ON

System voltage

NOTE
Check if the difference in output between *1 and *2 is 4 V or more.

GDI  – 

Troubleshooting

13A-110

CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS

1.

Turn the ignition switch to OFF.

2.

Disconnect the engine-ECU connector.

3.

Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.

NOTE
(1) When measuring resistance and checking continuity,

a harness for checking contact pin pressure should
be used instead of inserting a test probe.

(2) Checking need not be carried out in the order given

in the chart.

Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!

4.

If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.

5.

After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.