Mitsubishi Pajero Pinin. Manual - part 124

MPI <4G9> – 

Troubleshooting

13C-82

Terminal
No.

Normal condition

Check condition (Engine condition)

Check item

21

Radiator motor relay (LO)

Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90

_

C or less)

System voltage

Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90 – 105

_

C or less)

0 – 3 V

22

Fuel pump relay

Ignition switch: ON

System voltage

Engine: Idle speed

0 – 3 V

33

Alternator G terminal

D

Engine: Warm, idle 
(radiator fan: OFF)

D

Headlamp: OFF to ON

D

Rear defogger switch: OFF to ON

D

Brake lamp: ON

Voltage rises by 0.2 – 3.5 V.

41

Alternator FR terminal

D

Engine: Warm, idle 
(radiator fan: OFF)

D

Headlamp: OFF to ON

D

Rear defogger switch: OFF to ON

D

Brake lamp: ON

Voltage drops by 0.2 – 3.5 V.

36

Engine warning lamp

Ignition switch: “LOCK” (OFF) position

→

 ON

0 – 3 V 

→

 9 – 13 V  

(After several seconds have
elapsed)

37

Power steering fluid 
pressure switch

Engine: Idling after
warming up

When steering
wheel is stationary

System voltage

When steering
wheel is turned

0 – 3 V

38

Control relay 
(Power supply)

Ignition switch: “LOCK” (OFF) position

System voltage

(Power supply)

Ignition switch: ON

0 – 3 V

45

A/C switch 1

Engine: Idle speed

Turn the A/C
switch OFF

0 – 3 V

Turn the A/C
switch ON (A/C
compressor is
operating)

System voltage

58

Tachometer signal

Engine r/min: 3,000 r/min

0.3 – 3.0 V

60

Oxygen sensor (front)
heater

Engine: Idling after warming up

0 – 3 V

heater

Engine r/min: 5,000 r/min

System voltage

54

Oxygen sensor (rear)
heater

Engine: Idling after warming-up

0 – 3 V

heater

Engine r/min: 5,000 r/min

System voltage

71

Ignition switch – ST

Engine: Cranking

8 V or more

MPI <4G9> – 

Troubleshooting

13C-83

Terminal
No.

Normal condition

Check condition (Engine condition)

Check item

72

Intake air temperature
sensor

Ignition switch: ON

When intake air 
temperature is
0

_

C

3.2 – 3.8 V

When intake air 
temperature is
20

_

C

2.3 – 2.9 V

When intake air 
temperature is
40

_

C

1.5 – 2.1 V

When intake air 
temperature is
80

_

C

0.4 – 1.0 V

75

Oxygen sensor (rear)

D

Transmission: 2nd gear <M/T>, 
L range <A/T>

D

Engine r/min: 3,500 r/min or more

D

Driving with the throttle valve
widely open

0.6 – 1.0  V

76

Oxygen sensor (front)

Engine: Running at 2,500 r/min after
warmed up (Check using a digital type
voltmeter)

0 

´

 0.8 V 

(Changes repeatedly)

77

A/C thermo sensor

D

Ignition switch: ON

D

Temperature at sensor: 25

_

C (1.5

k

Ω

)

2.2 V

80

Backup power supply

Ignition switch: “LOCK” (OFF) position

System voltage

81

Sensor impressed 
voltage

Ignition switch: ON

4.5 – 5.5 V

82

Ignition switch – IG

Ignition switch: ON

System voltage

83

Engine coolant 
temperature sensor

Ignition switch: ON

When engine
coolant tempera-
ture is 0

_

C

3.2 – 3.8 V

When engine
coolant tempera-
ture is 20

_

C

2.3 – 2.9 V

When engine
coolant tempera-
ture is 40

_

C

1.3 – 1.9 V

When engine
coolant tempera-
ture is 80

_

C

0.3 – 0.9 V

84

Throttle position 
sensor

Ignition switch: ON

Set throttle valve
to idle position

0.3 – 1.0 V

Fully open throttle 
valve

4.5 – 5.5 V

MPI <4G9> – 

Troubleshooting

13C-84

Terminal
No.

Normal condition

Check condition (Engine condition)

Check item

85

Barometric pressure 
sensor

Ignition switch: ON

When altitude is 
0 m

3.7 – 4.3 V

When altitude is 
1,200 m

3.2 – 3.8 V

86

Vehicle speed sensor

D

Ignition switch: ON

D

Move the vehicle slowly forward

0 

´

 5 V 

(Changes repeatedly)

88

Camshaft position 
sensor

Engine: Cranking

0.4 – 3.0 V

sensor

Engine: Idle speed

0.5 – 2.0 V

89

Crank angle sensor

Engine: Cranking

0.4 – 4.0 V

Engine: Idle speed

1.5 – 2.5 V

90

Air flow sensor

Engine: Idle speed

2.2 – 3.2 V

Engine r/min: 2,500 r/min

CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS

1.

Turn the ignition switch to “LOCK” (OFF) position.

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.

MPI <4G9> – 

Troubleshooting

13C-85

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.

Engine-ECU Harness Side Connector Terminal Arrangement

Terminal
No.

Inspection item

Normal condition (Check condition)

1 – 12

No. 1 injector

13 – 16 

Ω 

(At 20

_

C)

14 – 12

No. 2 injector

2 – 12

No. 3 injector

15 – 12

No. 4 injector

4 – 12

Stepper motor coil (A)

28 – 33 

Ω

 (At 20

_

C)

17 – 12

Stepper motor coil (B)

5 – 12

Stepper motor coil (C)

18 – 12

Stepper motor coil (D)

6 – 12

EGR control solenoid valve

29 – 35 

Ω 

(At 20

_

C)

9 – 12

Purge control solenoid valve

29 – 35 

Ω

 (At 20

_

C)

13 – Body
earth

Engine-ECU earth

Continuity (0 

Ω

)

26 – Body
earth

Engine-ECU earth

60 – 12

Oxygen sensor (front) heater

4.5 – 8.0

 Ω

 (At 20

_

C)

54 – 12

Oxygen sensor (rear) heater

11 – 18

 Ω

 (At 20

_

C)