Mitsubishi Galant. Manual — part 286

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-369

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the A/T-DTC.
(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the A/T-DTC is output?

YES : Refer to GROUP 23A, Automatic Transaxle

Diagnosis

−

Diagnostic Trouble Code Chart(

P.23A-

37

).

NO : If DTC P0755 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0755 does not reset.

DTC P0760: Shift Solenoid C Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the shift solenoid C
(Second solenoid) is detected, the transaxle
control CPU inside the powertrain control module
(PCM) outputs a malfunction signal to the engine
control CPU in the PCM.

DTC SET CONDITIONS

Check Conditions, Judgment Criteria

•

Second solenoid failure signal is input to the
engine control CPU from the transaxle control
CPU.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

Second solenoid failed.

•

Open or shorted second solenoid circuit, or loose
connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-370

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the A/T-DTC.
(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the A/T-DTC is output?

YES : Refer to GROUP 23A, Automatic Transaxle

Diagnosis

−

Diagnostic Trouble Code Chart(

P.23A-

37

).

NO : If DTC P0760 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0760 does not reset.

DTC P0765: Shift Solenoid D Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the shift solenoid D
(overdrive solenoid) is detected, the transaxle
control CPU inside the powertrain control module
(PCM) outputs a malfunction signal to the engine
control CPU in the PCM.

DTC SET CONDITIONS

Check Conditions, Judgment Criteria

•

Overdrive solenoid failure signal is input to the
engine control CPU from the transaxle control
CPU.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

Overdrive solenoid failed.

•

Open or shorted second solenoid circuit, or loose
connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-371

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the A/T-DTC.
(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the A/T-DTC is output?

YES : Refer to GROUP 23A, Automatic Transaxle

Diagnosis

−

Diagnostic Trouble Code Chart(

P.23A-

37

).

NO : If DTC P0765 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0765 does not reset.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-372

DTC P1400: Manifold Differential Pressure Sensor Circuit Malfunction

CIRCUIT OPERATION

•

A 5-volt voltage is applied on the manifold
differential pressure sensor power terminal
(terminal 3) from the PCM (terminal 46). The
ground terminal (terminal 2) is grounded with the
PCM (terminal 57).

•

A voltage proportional to the pressure in the
intake manifold plenum is sent from the manifold
differential pressure sensor output terminal
(terminal 1) to the PCM (terminal 91).

AK000517

1 2 3

BLUE-RED

GREEN-YELLO

W

BLA

CK

MANIFOLD DIFFERENTIAL
PRESSURE (MDP)SENSOR

B-18
(MU802723)

91

46

57

1

2

3

5V

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)

ACX02483

CONNECTOR:B-18

MANIFOLD
DIFFERETIAL
PRESSURE
SENSOR

AE

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

AX