Mitsubishi Galant. Manual — part 154

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-297

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) <2.4L>

13A-298

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) <2.4L>

13A-299

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).

AK000474

1 2 3

BL

UE-RED

GREEN-

YELL

OW

BL

ACK

POWERTRAIN CONTROL
MODULE(PCM)

MANIFOLD
DIFFERENTIAL
PRESSURE
(MDP)SENSOR

B-18
(MU802723)

C-40
(MU803781)

C-41
(MU803782)

91

46

57

1

2

3

5V

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

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

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

AX

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-300

TECHNICAL DESCRIPTION

•

The manifold differential pressure sensor outputs
a voltage which corresponds to the negative
pressure in the intake manifold.

•

The PCM checks whether the voltage output by
manifold differential pressure sensor is within a
specified range.

DTC SET CONDITIONS

Check Conditions

•

Eight minutes or more have passed after starting
the engine. Note that this is only if the engine
coolant temperature is less than 0

°

C (32

°

F)

when starting.

•

Engine coolant temperature is higher than 45

°

C

(113

°

F).

•

Intake air temperature is higher than 5

°

C (41

°

F).

•

Volumetric efficiency is between 30 and 45
percent.

Judgment Criteria

•

Manifold differential pressure sensor output
voltage has continued to be higher than 4.6 volts
[corresponding to an absolute pressure of 118
kPa (17 psi) or higher] for 2 seconds.

or

•

Manifold differential pressure sensor output
voltage has continued to be lower than 0.1 volt
[corresponding to an absolute pressure of 2.4
kPa (0.3 psi) or lower] for 2 seconds.

Check Conditions

•

Eight minutes or more have passed after starting
the engine. Note that this is only if the engine
coolant temperature is 0

°

C (32

°

F) or more when

starting.

•

Engine coolant temperature is higher than 45

°

C

(113

°

F).

•

Intake air temperature is higher than 5

°

C (41

°

F).

•

Volumetric efficiency is lower than 30 percent.

Judgment Criteria

•

Manifold differential pressure sensor output
voltage has continued to be higher than 4.2 volts
[corresponding to an absolute pressure of 108
kPa (16 psi) or higher] for 2 seconds.

Check Conditions

•

Eight minutes or more have passed after starting
the engine. Note that this is only if the engine
coolant temperature is 0

°

C (32

°

F) or more when

starting.

•

Engine coolant temperature is higher than 45

°

C

(113

°

F).

•

Intake air temperature is higher than 5

°

C (41

°

F).

•

Volumetric efficiency is higher than 70 percent.

Judgment Criteria

•

Manifold differential pressure sensor output
voltage has continued to be lower than 1.8 volts
[corresponding to an absolute pressure of 46 kPa
(4.6 psi) or lower] for 2 seconds.

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

•

Manifold differential pressure sensor failed.

•

Open or shorted manifold differential pressure
sensor circuit, or loose connector.

•

PCM failed.

DIAGNOSIS

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