Mitsubishi Galant 9G. Manual — part 775

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-542

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check harness connector B-120 at the knock
sensor 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 go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

INTAKE
MANIFOLD

INTAKE
MANIFOLD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-543

STEP 2. Check the continuity at knock sensor harness
side connector B-120.
(1) Disconnect the connector B-120 and measure at the

harness side.

(2) Check for the continuity between terminal No. 2 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 3.
NO : Repair harness wire between knock sensor connector

B-120 (terminal No. 2) and ground because of open
circuit or harness damage. Then go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

INTAKE
MANIFOLD

INTAKE
MANIFOLD

AKX01415

2 1

B-120 HARNESS
CONNECTOR:
COMPONENT SIDE

AU

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-544

STEP 3. Check harness connector B-21 at PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 6.

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) <2.4L ENGINE>

13A-545

STEP 4. Check for open circuit and short circuit to ground
and harness damage between knock sensor connector
B-120 (terminal No. 1) and PCM connector B-21 (terminal
No. 59).
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO : Repair it. Then go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

INTAKE
MANIFOLD

INTAKE
MANIFOLD

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)