Mitsubishi Outlander GS45X. Manual - part 950

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-733

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

YES : Refer to GROUP 27C, Diagnosis 

− Diagnostic 

Trouble Code Chart 

P.27C-11

.

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 AWD-ECU sets DTC No. U0114. 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 U0114 set?

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

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-734

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 U0114 set?

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

of CAN bus line between ECM and AWD-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 U0114 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 AWD-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 U0114 set?

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

DTC U0121: ABS-ECU/ASC-ECU Time-out

CAUTION

• If the ECM output the DTC U0121, make sure 

to diagnose the CAN bus line.

• Before replacing the ECU, make sure that the 

communication circuit is operating normally.

.

DTC SET CONDITIONS

Check Conditions

• Battery positive voltage is 10 volts or higher.

• After 2 seconds have passed since the ignition 

switch was turned to "ON" position.

Judgement Criterion

• Unable to receive ABS-ECU/ASC-ECU signals 

through the CAN bus line for 4 seconds.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-735

.

COMMENT

Current Trouble

• Some of the possible causes are a harness or 

connector damage between the ECM and the 
ABS-ECU/ASC-ECU on the CAN bus line, a fail-
ure in the ABS-ECU/ASC-ECU power supply sys-
tem, a failure in the ABS-ECU/ASC-ECU, or a 
failure in the ECM.

Past Trouble

• Proceed to troubleshoot based on a harness or 

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

− How to Cope with Intermit-

tent Malfunctions 

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 U0121 (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

).

.

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-736

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

YES : Refer to GROUP 35C, Diagnosis 

− Diagnostic 

Trouble Code Chart 

P.35C-18

.

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 ASC-ECU sets DTC No. U0121. 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 U0121 set?

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

AK700568AB

MB991824

MB991827

MB991910

Data link
connector