Mitsubishi Outlander GS45X. Manual - part 951

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-737

STEP 4. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0121 set?

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

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

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

STEP 5. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0121 set?

YES : Replace the ECM (Refer to, Removal and Installation 

P.13B-903

). Then go to Step 6.

NO :  It can be assumed that this malfunction is intermittent 

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

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

STEP 6. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0121 set?

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

DTC U0141: ETACS-ECU Time-Out

CAUTION

• If the ECU output the DTC U0141, 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 ETACS-ECU for the specified 
time. (ETACS-ECU also detect communication error 
with ECM.)

.

MONITOR EXECUTION

Continuous

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-738

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
Logic Flow Chart

Check Conditions

• Battery positive voltage is between 10 and 16.5 

volts.

Judgement Criterion

• Unable to receive ETACS-ECU signals through 

the CAN bus line for 4 seconds.

.

COMMENT

Current Trouble

• Some of the possible causes are a harness or 

connector damage between the ECM and the 
ETACS-ECU on the CAN bus line, a failure in the 
ETACS-ECU power supply system, a failure in 
the ETACS-ECU, or a failure in the ECM.

AK604369

Start

Yes

Yes

Yes

No

No

No

Continuous failure

for specified time

Malfunction

End

Good

Monitoring
conditions

Communication status

fails

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-739

Past Trouble

• Proceed to troubleshoot based on a harness or 

connector damage on the CAN bus line between 
the ECM and ETACS-ECU, and a failure in the 
ETACS power supply system. Refer to "How to 
cope with past trouble" (Refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent Malfunc-

tions 

P.00-15

).

CAUTION

When the ignition key is maintained within the 
range "A" (i.e., the ignition switch IG2 is in OFF 
position but the cranking does not start) for more 
than 1 second, ECM stores DTC U0141 (the past 
trouble).
NOTE: If a malfunction occurred in the past, a failure 
cannot be discovered through the MB991958 CAN 
bus diagnosis even if there might be a problem with 
the CAN bus. In this case, refer to GROUP 00,How 
to Use Troubleshooting/Inspection Service Points 

−

 

How to Cope with Intermittent Malfunctions 

P.00-15

. 

Furthermore, it is possible to narrow down the areas 
of the possible failures from the DTCs that are output 
by the ECUs, which are communicating on the CAN 
bus (Refer to GROUP 54C, Explanation About The 
Scan Tool (M.U.T.-III) Can Bus Diagnostics 

P.54C-10

).

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• CAN line harness damage or connector damage.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

AK700540AB

ACC position

Lock (off)
position

ON position

Start
position

Range
"A"

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-740

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, 

Diagnosis 

− CAN Bus Diagnostics Table 

P.54C-17

. 

Then go to Step 6.

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the ETACS-DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ETACS-DTC set?

YES : Refer to GROUP 54A, ETACS 

− Diagnostic Trouble 

Code Chart 

P.54A-732

.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Check that the other ECU performing CAN communication 

with ETACS-ECU sets DTC No. U0141. Refer to GROUP 
54C, CAN Communication-related DTC (U-code) table 

P.54C-220

.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0141 set?

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

AK700568AB

MB991824

MB991827

MB991910

Data link
connector