Mitsubishi Outlander XL. Manual - part 387

Past Trouble

｠

Proceed  to  troubleshoot  based  on  a  harness  or
connector  damage  on  the  CAN  bus  line  between
the ECM ABS-ECU/ASC-ECU 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/Inspection Service Points - How to
Cope with Intermittent Malfunctions P.00-15).

ZK604060 AA00

ACC POSITION

LOCK (OFF) 
POSITION

ON POSITION

START
POSITION

RANGE 
"A"

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
54D, CAN bus line Diagnostics Flow P.54D-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

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-743

DIAGNOSTIC TROUBLE CODE PROCEDURES

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

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting or disconnecting san 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 the "LOCK" (OFF) position.

Q:Is the CAN bus line normal?

YES:

 It can be assumed that this malfunction is

intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunctions P.00-15.

NO:

 Repair the CAN bus line. Refer to GROUP 54D, Can bus

Diagnostics Table P.54D-10. Then go to Step 2.

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.

(1)

Erase the DTC.

(2)

Turn the ignition switch to the "ON" position.

(3)

Check if DTC is set.

(4)

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

M11310100400USA0000010000

 

｠

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.

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 failure in the
ABS-ECU/ASC-ECU  power  supply  system,  a
failure in the ABS-ECU/ASC-ECU, or a failure in the
ECM.

13Ab-744

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

Past Trouble

｠

Proceed  to  troubleshoot  based  on  a  harness  or
connector  damage  on  the  CAN  bus  line  between
the ECM ABS-ECU/ASC-ECU 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/Inspection Service Points - How to
Cope with Intermittent Malfunctions P.00-15).

ZK604060 AA00

ACC POSITION

LOCK (OFF) 
POSITION

ON POSITION

START
POSITION

RANGE 
"A"

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
54D, CAN bus line Diagnostics Flow P.54D-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

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-745

DIAGNOSTIC TROUBLE CODE PROCEDURES

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

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting 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:

 It can be assumed that this malfunction is

intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunctions P.00-15.

NO:

 Repair the CAN bus line. Refer to GROUP 54D, Can bus

Diagnostics Table P.54D-10. Then go to Step 2.

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

(1)

Erase the DTC.

(2)

Turn the ignition switch to the "ON" position.

(3)

Check if DTC is set.

(4)

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

M11310100401USA0000010000

 

｠

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

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

 

13Ab-746

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES