Mitsubishi Galant (2004+). Manual - part 1095

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-73

STEP 2. Measure the sensor output voltage at Manifold 
Absolute pressure sensor connector B-02 by backprobing.
(1) Do not disconnect the connector B-02.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground by 

backprobing.

• When altitude is 0 m (0 foot), voltage should be 3.7 and 

4.3 volts.

• When altitude is 600 m (1,969 feet), voltage should be 

3.4 and 4.0 volts.

• When altitude is 1,200 m (3,937 feet), voltage should be 

3.2 and 3.8 volts.

• When altitude is 1,800 m (5,906 feet), voltage should be 

2.9 and 3.5 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is measured the voltage normal?

YES : Go to Step 10.
NO :  Go to Step 3.

STEP 3. Measure the sensor supply voltage at manifold 
absolute pressure sensor connector B-02 by backprobing.
(1) Do not disconnect the connector B-02.
(2) Turn the ignition switch to the "ON" position.

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

backprobing.

• Voltage should be between 4.9 and 5.1 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?

YES : Go to Step 6.
NO :  Go to Step 4.

AK303023

1

2

3

CONNECTOR: B-02

AB

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

INTAKE
MANIFOLD

B-02 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

3

2

1

AK303024

B-02 HARNESS 
CONNECTOR: 
HARNESS SIDE

AB

AK303023

1

2

3

CONNECTOR: B-02

AB

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

INTAKE
MANIFOLD

B-02 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

3

2

1

AK303027

B-02 HARNESS 
CONNECTOR: 
HARNESS SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-74

STEP 4. Check harness connector B-02 at the manifold 
absolute pressure sensor and harness connector B-21 at 
PCM for damage.
Q: Is the harness connector in good condition?

YES : Go to step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 13.

AK303023

1

2

3

CONNECTOR: B-02

AB

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

INTAKE
MANIFOLD

B-02 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-75

STEP 5. Check for harness damage between manifold 
absolute pressure sensor connector B-02 (terminal No. 3) 
and PCM connector B-21 (terminal No. 68).
Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO :  Repair it. Then go to Step 13.

AK303023

1

2

3

CONNECTOR: B-02

AB

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

INTAKE
MANIFOLD

B-02 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-76

STEP 6. Measure the ground voltage at manifold absolute 
pressure sensor connector B-02 by backprobing.
(1) Do not disconnect the connector B-02.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2 and ground by 

backprobing.

• Voltage should be 0.5 volt or less.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?

YES : Go to Step 9.
NO :  Go to Step 7.

AK303023

1

2

3

CONNECTOR: B-02

AB

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

INTAKE
MANIFOLD

B-02 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

3

2

1

AK303030

B-02 HARNESS 
CONNECTOR: 
HARNESS SIDE

AB