Mitsubishi Galant (2004+). Manual - part 1028

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-929

STEP 1. Using scan tool MB991958, diagnose CAN bus 
line.

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) Diagnose CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. Refer to GROUP 54C, Can 

Bus Diagnostics Table 

P.54C-14

. Then go to Step 6.

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Read the ABS-DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ABS-DTC set?

YES : Refer to GROUP 35B, Anti-Lock Braking 

System-Diagnostic Trouble Code Chart 

P.35B-11

.

NO :  Go to Step 3.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-930

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the combination meter-DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1102 set?

YES : Go to Step 4.
NO :  Go to Step 5.

STEP 4. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1102 set?

YES : Replace the ABS-ECU. Then go to Step 6.
NO :  It can be assumed that this malfunction is intermittent 

of CAN bus line between PCM and ABS-ECU. Refer 
to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-931

STEP 5. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1102 set?

YES : Replace the PCM. Then go to Step 6.
NO :  It can be assumed that this malfunction is intermittent 

of CAN bus line between PCM and ABS-ECU. Refer 
to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

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

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1102 set?

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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-932

DTC U1108: COMBINATION METER TIME-OUT

CAUTION

• If the PCM output the DTC U1102, make sure 

to diagnose the CAN bus line.

• Before replacing the ECU, make sure that the 

communication circuit is operating normally.

.

DESCRIPTIONS OF MONITOR METHODS
There is no data from combination meter for the 

specified time. (Meter also detect communication 
error with PCM.)

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS

Lgic Flow Chart

Check Conditions

• Battery positive voltage is 10 volts or higher.

• Engine is not cranked, or at least 3 seconds have 

passed since engine was cranked.

Judgement Criteria

• Unable to receive combination meter signals 

through the CAN bus line.

.

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

CONTINUOUS

FAILURE FOR 5secs

MONITORING

CONDITIONS

AK204025

COMMUNICATION STATUS

FAILS

GOOD