Mitsubishi Galant 9G. Manual — part 1075

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-600

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) <3.8L ENGINE>

13B-601

STEP 4. Check for open circuit, 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.

AK303120

1

2

KNOCK SENSOR

AB

CONNECTOR: B-120

B-120 (GR)

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-602

STEP 5. Check the knock sensor.
(1) Disconnect the knock sensor connector B-120.
(2) Start the engine and run at idle.

(3) Measure the voltage between knock sensor side connector

terminal No. 1 (output) and No. 2 (ground).

(4) Gradually increase the engine speed.

• The voltage increases with the increase in the engine

speed.

(5) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?

YES : Replace the PCM. Then go to Step 6.
NO : Replace the knock sensor. Then go to Step 6.

AK303120

1

2

KNOCK SENSOR

AB

CONNECTOR: B-120

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303857

1 2

AB

KNOCK SENSOR
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-603

STEP 6. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTC.
(4) Test drive under the following conditions:

• Engine speed: 3000 − 5000r/min

• Engine load: 40% or more

• Drive a minimum of 3 seconds after the above condi-

tions have been met.

(5) After completing the test drive, read the DTC.Turn the

ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P0325 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827