Mitsubishi Galant. Manual — part 226

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-129

STEP 7. Check for open circuit or short circuit to ground
between right bank heated oxygen sensor (front)
connector B-33 terminal 3 and PCM connector C-39
terminal 4.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

STEP 8. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

AK000617

CONNECTOR:B-33

AB

AK000280

CONNECTOR : C-39

PCM

AW

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-130

STEP 9. Check for harness damage between MFI relay
connector A-21X terminal 1 and right bank heated oxygen
sensor (front) connector B-33 terminal 1.
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO : Repair it. Then go to Step 12.

STEP 10. Check for harness damage between right bank
heated oxygen sensor (front) connector B-33 terminal 3
and PCM connector C-39 terminal 4.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 12.

AK000555AB

CONNECTOR : A-21X

MFI RELAY

AK000617

CONNECTOR:B-33

AB

AK000617

CONNECTOR:B-33

AB

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-131

STEP 11. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0135 is output?

YES : Replace the PCM. Then go to Step 12.
NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points(

P.00-8

).

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0135 is output?

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

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-132

DTC P0136: O

2

Sensor Circuit Malfunction (bank 1 sensor 2)

AK000503

BLA

CK

BLA

CK

YELLO

W

3 4

1 2

FROM MFI RELAY

RIGHT BANK HEATED
OXYGEN SENSOR(REAR)

TO ECM
OR PCM

74

57

1

3

2

4

B-31
MU802665

POWERTRAIN CONTROL
MODULE(PCM)

C-40
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

82 83
93

84 85

94

86 87

95 96

90

97

C-41
(MU803782)