Mitsubishi Galant. Manual — part 285

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-365

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 P0720 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0720 does not reset.

DTC P0725: Engine Speed Input Circuit Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the crankshaft position
sensor 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

•

Crankshaft position sensor 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:)

•

Crankshaft position sensor failed.

•

Open or shorted crankshaft position sensor
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-366

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 P0725 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0725 does not reset.

DTC P0740: Torque Converter Clutch System Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the torque converter
clutch or its related system 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

•

Failed signal of the torque converter clutch or its
related system 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:)

•

Torque converter clutch or its related system
failed.

•

Open or shorted torque converter clutch or its
related system 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-367

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 P0740 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0740 does not reset.

DTC P0750: Shift Solenoid A Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the shift solenoid A (low-
reverse 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

•

Low-reverse 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:)

•

Low-reverse solenoid failed.

•

Open or shorted low-reverse solenoid circuit, or
loose connector.

•

PCM failed.

DIAGNOSIS

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

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-368

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.13A-

294

).

NO : If DTC P0750 is output again after the MFI-DTC has

been erased, replace the PCM. Then check that the
DTC P0750 does not reset.

DTC P0755: Shift Solenoid B Malfunction

TECHNICAL DESCRIPTION

•

When a malfunction of the shift solenoid B
(underdrive 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

•

Underdrive 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:)

•

Underdrive solenoid failed.

•

Open or shorted underdrive solenoid circuit, or
loose connector.

•

PCM failed.

DIAGNOSIS

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

AC003081 AB

16 PIN

MB991502