Mitsubishi Galant (2004+). Manual - part 1351

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1097

HO2S 
BANK1 
S2

69

Heated oxygen 
sensor bank 1, 
sensor 2 (right 
rear) 

Engine: 
warming up

Revving

0 and 600 

− 

1,000 mV 
alternate.

Code No. 
P0136, 
P0137, 
P0138, 
P0139

P.13B-2
50

, 

P.13B-2
68

, 

P.13B-2
75

, 

P.13B-2
80

HO2S 
BANK1 
S2

A2*

4

Heated oxygen 
sensor bank 1, 
sensor 2 (right 
rear) 

Engine: 
warming up

Revving

0 and 0.6 

− 1 V 

alternate.

Code No. 
P0136, 
P0137, 
P0138, 
P0139

P.13B-2
50

, 

P.13B-2
68

, 

P.13B-2
75

, 

P.13B-2
80

HO2S 
BANK2 
S1

11

Heated oxygen 
sensor bank 2, 
sensor 1 (left 
front)

Engine: 
Warming up 
(air/fuel 
mixture is 
made leaner 
when 
decelerating, 
and is made 
richer when 
revving.)

When the 
engine is 
running at 
4000 r/min, 
decelerate 
suddenly.

200 mV or less Code No. 

P0150, 
P0151, 
P0152, 
P0153, 
P0154

P.13B-3
00

, 

P.13B-3
18

, 

P.13B-3
25

, 

P.13B-3
30

, 

P.13B-3
36

When engine 
is suddenly 
revved.

600 

− 1,000 

mV

Engine: 
Warming up 
(the heated 
oxygen sensor 
signal is used 
to check the 
air/fuel mixture 
ratio, and 
control 
condition is 
also checked 
by the PCM)

Engine is idling Voltage 

changes 
repeatedly 
between 400 
mV or less and 
600 

− 1,000 

mV.

2,500 r/min

MUT-III SCAN 
TOOL DISPLAY

ITEM NO. 

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1098

HO2S 
BANK2 
S1

A3*

4

Heated oxygen 
sensor bank 2, 
sensor 1 (left 
front)

Engine: 
Warming up 
(air/fuel 
mixture is 
made leaner 
when 
decelerating, 
and is made 
richer when 
revving.)

When the 
engine is 
running at 
4,000 r/min, 
decelerate 
suddenly.

0.2 V or less

Code No. 
P0150, 
P0151, 
P0152, 
P0153, 
P0154

P.13B-3
00

, 

P.13B-3
18

, 

P.13B-3
25

, 

P.13B-3
30

, 

P.13B-3
36

When engine 
is suddenly 
revved.

0.6 

− 1 V

Engine: 
Warming up 
(the heated 
oxygen sensor 
signal is used 
to check the 
air/fuel mixture 
ratio, and 
control 
condition is 
also checked 
by the PCM)

Engine is idling Voltage 

changes 
repeatedly 
between 0.4 V 
or less and 0.6 
− 1 V.

2500 r/min

HO2S 
BANK2 
S2

59

Heated oxygen 
sensor bank 2, 
sensor 2 (left 
rear) 

Engine: 
warming up

Revving

0 and 600 

− 

1,000 mV 
alternate.

Code No. 
P0156, 
P0157, 
P0158, 
P0159

P.13B-3
59

, 

P.13B-3
77

, 

P.13B-3
84

, 

P.13B-3
89

HO2S 
BANK2 
S2

A4*

4

Heated oxygen 
sensor bank 2, 
sensor 2 (left 
rear) 

Engine: 
warming up

Revving

0 and 0.6 

− 1 V 

alternate.

Code No. 
P0156, 
P0157, 
P0158, 
P0159

P.13B-3
59

,  

P.13B-3
77

, 

P.13B-3
84

, 

P.13B-3
89

MUT-III SCAN 
TOOL DISPLAY

ITEM NO. 

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1099

IAT 
SENSOR

13

Intake air 
temperature 
sensor

Ignition switch: 
"ON" or with 
engine running

Intake air 
temperature is 
−20°C (−4°F)

−20°C (−4°F)

Code No. 
P0111, 
P0112, 
P0113

P.13B-1
03

, 

P.13B-1
12

, 

P.13B-1
19

Intake air 
temperature is 
0

°C (32°F)

0

°C (32°F)

Intake air 
temperature is 
20

°C (68°F)

20

°C (68°F)

Intake air 
temperature is 
40

°C (104°F)

40

°C (104°F)

Intake air 
temperature is 
80

°C (176°F)

80

°C (176°F)

IAT 
SENSOR

13*

4

Intake air 
temperature 
sensor

Ignition switch: 
"ON" or with 
engine running

Intake air 
temperature is 
−20°C (−4°F)

−20°C (−4°F)

Code No. 
P0111, 
P0112, 
P0113

P.13B-1
03

, 

P.13B-1
12

, 

P.13B-1
19

Intake air 
temperature is 
0

°C (32°F)

0

°C (32°F)

Intake air 
temperature is 
20

°C (68°F)

20

°C (68°F)

Intake air 
temperature is 
40

°C (104°F)

40

°C (104°F)

Intake air 
temperature is 
80

°C (176°F)

80

°C (176°F)

IG. 
TIMING 
ADV

44

Ignition coils 
and ignition 
power 
transistor

• Engine: 

warming up

• Timing light 

is set (to 
check actual 
ignition 
timing)

Engine is idling BTDC 2 

−18°

-

-

2,500 r/min

BTDC 27 

− 47°

IG. 
TIMING 
ADV

44*

4

Ignition coils 
and ignition 
power 
transistor

• Engine: 

warming up

• Timing light 

is set (to 
check actual 
ignition 
timing)

Engine is idling 2 

− 18 deg

-

-

2,500 r/min

27 

− 47 deg

MUT-III SCAN 
TOOL DISPLAY

ITEM NO. 

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1100

INJECTO
R BNK1

47

Injectors bank 
1 (right)*

2

Engine: 
cranking

When engine 
coolant 
temperature is 
0 

°C (32 °F)

80 

− 140 ms

−

−

When engine 
coolant 
temperature is 
20 

°C (68 °F)

20 

− 80 ms

When engine 
coolant 
temperature is 
80 

°C (176 °F)

8 

− 16 ms

Injectors bank 
1 (right)*

3

• Engine 

coolant 
temperature
: 80 

− 95°C 

(176 

− 

203

°F)

• Lights, 

electric 
cooling fan 
and all 
accessories
: "OFF"*

5

• Transaxle: 

"P" range

Engine is idling 1.2 

− 3.2 ms

2,500 r/min

1.0 

− 3.0 ms

When engine 
is suddenly 
revved

Increases

MUT-III SCAN 
TOOL DISPLAY

ITEM NO. 

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE