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Mitsubishi Galant 9G. Manual - part 910

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1082

DIAGNOSIS

STEP 1. Check harness connector B-21 at PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK303018

54 53 52 51

62 61 60 59 58

69 68 67 66 65 64

75 74 73 72 71

82 81 80 79 78 77

CONNECTOR: B-21

PCM

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1083

STEP 2. Check the circuit at PCM connector B-21.
(1) Disconnect the connectors B-21 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 81 and ground.

• Voltage should be battery positive voltage.

(4) Using a jumper wire, connect terminal No. 81 to ground.

• A/C compressor clutch relay should turn "ON".

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor relay condition

normal?
YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Refer to GROUP 55, Diagnosis

− Introduction To

Heater, Air Conditioning And Ventilation Diagnosis

P.55A-5

. Then confirm that the malfunction symptom

is eliminated.

DATA LIST REFERENCE TABLE

M1131152001534

CAUTION

• When shifting the selector lever to D range, the brakes should be applied so that the vehicle does

not move forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: *

: In a new vehicle [driven approximately 500 km (311 mile) or less], the mass airflow sensor output

value is sometimes 10% higher than the standard value.
NOTE: *

: The injector drive time represents the time when the cranking speed is at 250 r/min or below when

the power supply voltage is 11 volts.
NOTE: *

: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is some-

times 10% longer than the standard time.
NOTE: *

Applicable to GST

NOTE: *

: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF"

position but this is no problem for checks.

AK303018

54 53 52 51

62 61 60 59 58

69 68 67 66 65 64

75 74 73 72 71

82 81 80 79 78 77

CONNECTOR: B-21

PCM

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

B-21 (B)

54 53 52 51

62 61 60 59 58

69 68 67 66 65 64

75 74 73 72 71

82 81 80 79 78 77

AK203295

B-21 HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1084

MUT-III
SCAN TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL
CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

A/C
RELAY

A/C
compressor
clutch relay

• Engine: warming up, idling

• A/C switch: "OFF"

OFF

Procedure
No. 32

P.13A-10
81

• Engine:

warming up,
idling

• A/C switch:

"ON"

A/C
compressor
clutch is not
operating

OFF

A/C
compressor
clutch is
operating

APP SNS
(MAIN)

Accelerator
pedal position
sensor (main)

Ignition switch:
"ON"

Release the
accelerator
pedal

735

− 1,335

Code No.
P2122,
P2123

P.13A-89
3

P.13A-90
3

Depress the
accelerator
pedal gradually

Increases in
response to
the pedal
depression
stroke

Depress the
accelerator
pedal fully

4,000 mV or
more

APP
SNSR
(SUB)

Accelerator
pedal position
sensor (sub)

Ignition switch:
"ON"

Release the
accelerator
pedal

435

− 1,035

Code No.
P2127,
P2128

P.13A-91
0

P.13A-92
0

Depress the
accelerator
pedal gradually

Increases in
response to
the pedal
depression
stroke

Depress the
accelerator
pedal fully

3,700 mV or
more

BARO
SENSOR

Barometric
pressure
sensor

Ignition switch:
"ON"

At altitude of 0
m (0 ft)

101 kPa (29.8
in.Hg)

Code No.
P2228,
P2229

P.13A-94
7

P.13A-94
9

At altitude of
600 m (1,969
ft)

95 kPa (28.1
in.Hg)

At altitude of
1,200 m (3,937
ft)

88 kPa (26.0
in.Hg)

At altitude of
1,800 m (5,906
ft)

81 kPa (23.9
in.Hg)

BATT
VOLTAGE

Power supply
voltage

Ignition switch: "ON"

Battery
positive
voltage

Procedure
No. 28

P.13A-10
43

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1085

CKP
SENSOR

Crankshaft
position sensor

• Engine: cranking

• Tachometer: connected

Engine
speeds
displayed on
the scan tool
and
tachometer
are identical.

Code No.
P0335

P.13A-54
8

Engine: idling

Engine coolant
temperature is
−20°C (−40°F)

1,275

− 1,475

r/min

Engine coolant
temperature is
0

°C (32°F)

1,220

− 1,420

r/min

Engine coolant
temperature is
20

°C (68°F)

1,200

− 1,400

r/min

Engine coolant
temperature is
40

°C (104°F)

1,150

− 1,350

r/min

Engine coolant
temperature is
80

°C (176°F)

660

− 860

r/min

CRANK.
SIGNAL

Cranking
signal (ignition
switch-ST)

Ignition switch:
"ON"

Engine:
stopped

OFF

Procedure
No. 30

P.13A-10
68

Engine:
cranking

ECT
SENSOR

Engine coolant
temperature
sensor

Ignition switch:
"ON" or with
engine running

Engine coolant
temperature is
−20°C (−4°F)

−20°C (−4°F) Code No.

P0116,
P0117,
P0118

P.13A-13
3

P.13A-14
2

P.13A-14
9

Engine coolant
temperature is
0

°C (32°F)

Engine coolant
temperature is
20

°C (68°F)

Engine coolant
temperature is
40

°C(104°F)

°C (104°F)

Engine coolant
temperature is
80

°C (176°F)

MUT-III
SCAN TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL
CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

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