Mitsubishi Outlander XL. Manual - part 1190

Q:Is the check result satisfactory?

YES:

 A poor connection, open circuit or other

intermittent malfunction is present in the lines between
the combination meter and the A/C-ECU (Refer to GROUP 00E,
Harness Connector Inspection P.00E-2.)

NO:

 Replace the combination meter. On completion, check

that the DTC is not reset.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check if the DTC is set.

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the check result satisfactory?

YES:

 A poor connection, open circuit or other

intermittent malfunction is present in the lines between
the combination meter and the A/C-ECU (Refer to GROUP 00E,
Harness Connector Inspection P.00E-2.)

NO:

 Replace the A/C-ECU. On completion, check that the

DTC is not reset.

DTC U0168: WCM Time-out

M15502000953USA0000010000

If DTC U0168 is set in the A/C-ECU, diagnose the
CAN main bus line.

Whenever  the  ECU  is  replaced,  ensure  that  the
communication circuit is normal.

TROUBLE JUDGMENT
The  A/C-ECU  receives  the  air  conditioning  control-
related signals from the WCM-ECU via the CAN bus
lines.  If  any  of  the  air  conditioning  control-related
signals from the WCM-ECU cannot be received, the
diagnostic trouble code U0168 is stored.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

｠

Connector(s) or wiring harness in the CAN bus lines
between  the  WCM-ECU  and  the  A/C-ECU,  the
power supply system to the WCM-ECU, the WCM-
ECU itself, or the A/C-ECU may be defective.

Past trouble

｠

If DTC U0168 is stored as a past trouble, carry out
diagnosis  with  particular  emphasis  on  wiring  and

connector(s) in the CAN bus line between the A/C-
ECU  and  the  WCM-ECU,  and  the  power  supply
system  to  the  WCM-ECU.  If  the  connectors  and
wiring  are  normal,  and  obviously  the  ECU  is  the
cause of the trouble, replace the ECU. If in doubt,
do not replace the ECU.

NOTE: 

For a past trouble, you cannot find it by

the scan tool CAN bus diagnostics even if there
is a failure in CAN bus lines. In this case,
refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points - How to Cope with
Intermittent Malfunctions P.00-15) and check
the CAN bus lines. You can narrow down the
possible cause of the trouble by referring to
the DTC, which is set regarding the CAN
communication-linked ECUs (Refer to GROUP 54D,
Explanation about the scan too CAN bus
diagnostics P.54D-10).

TROUBLESHOOTING HINTS

｠

Malfunction of the WCM-ECU

｠

Malfunction of the A/C-ECU

｠

Damaged harness wires and connectors

AIR CONDITIONING

55A-51

MANUAL A/C DIAGNOSIS

DIAGNOSIS

Required Special Tools:

｠

MB991223: Harness Set

｠

MB992006: Extra Fine Probe

｠

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

｠

MB991824: V.C.I.

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the 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. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.55A-6."

(2)

Turn the ignition switch to the "ON" position.

(3)

Diagnose the CAN bus line.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the CAN bus line found to be normal?

YES:

 Go to Step 2.

NO:

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

Diagnosis P.54D-17).

STEP 2. Using scan tool MB991958 read the WCM-ECU
diagnostic trouble code.
Check whether an WCM-ECU DTCs are set or not.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check for WCM-ECU DTCs.

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the check result satisfactory?

YES:

 Go to Step 3.

NO:

 Diagnose the WCM-ECU (Refer to GROUP 42C, Diagnostic

Trouble Code P.42C-11).

STEP 3. Using scan tool MB991958, check for any
diagnostic trouble code.
Check  if  a  DTC,  which  relates  to  CAN  communication-linked
systems below, is set.

｠

ETACS-ECU
DTC  indicating  a  time-out  error  related  to  the  WCM-ECU
system

(1)

Turn the ignition switch to the "ON" position.

55A-52

AIR CONDITIONING

MANUAL A/C DIAGNOSIS

(2)

Check for a DTC related to the relevant system.

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the check result satisfactory?

YES:

 Go to Step 5.

NO:

 Go to Step 4.

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check if the DTC is set.

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the check result satisfactory?

YES:

 A poor connection, open circuit or other

intermittent malfunction is present in the lines between
the WCM-ECU and the A/C-ECU (Refer to GROUP 00E, Harness
Connector Inspection P.00E-2.)

NO:

 Replace the WCM-ECU. On completion, check that the

DTC is not reset.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check if the DTC is set.

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the check result satisfactory?

YES:

 A poor connection, open circuit or other

intermittent malfunction is present in the lines between
the WCM-ECU and the A/C-ECU (Refer to GROUP 00E, Harness
Connector Inspection P.00E-2.)

NO:

 Replace the A/C-ECU. On completion, check that the

DTC is not reset.

DTC U0184: Audio Time-out

M15502000954USA0000010000

If DTC U0184 is set in the A/C-ECU, diagnose the
CAN main bus line.

Whenever  the  ECU  is  replaced,  ensure  that  the
communication circuit is normal.

TROUBLE JUDGMENT
The  A/C-ECU  receives  air  conditioning  operation-
related signals from the audio via the CAN bus lines.
If  any  of  the  air  conditioning  control-related  signals
from  the  audio  cannot  be  received,  the  diagnostic
trouble code U0184 is stored.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

｠

Connector(s) or wiring harness in the CAN bus lines
between  the  Audio  and  the  A/C-ECU,  the  power
supply system to the Audio, the Audio itself, or the
A/C-ECU may be defective.

AIR CONDITIONING

55A-53

MANUAL A/C DIAGNOSIS

Past trouble

｠

If DTC U0184 is stored as a past trouble, carry out
diagnosis  with  particular  emphasis  on  wiring  and
connector(s) in the CAN bus line between the A/C-
ECU and the Audio, and the power supply system
to  the  Audio.  If  the  connectors  and  wiring  are
normal, and obviously the ECU is the cause of the
trouble, replace the ECU. If in doubt, do not replace
the ECU.

NOTE: 

For a past trouble, you cannot find it by

the scan tool CAN bus diagnostics even if there
is a failure in CAN bus lines. In this case,
refer to GROUP 00, How to Use Troubleshooting/

Inspection Service Points - How to Cope with
Intermittent Malfunctions P.00-15) and check
the CAN bus lines. You can narrow down the
possible cause of the trouble by referring to
the DTC, which is set regarding the CAN
communication-linked ECUs (Refer to GROUP 54D,
Explanation about the scan too CAN bus
diagnostics P.54D-10).

TROUBLESHOOTING HINTS

｠

Malfunction of the Audio

｠

Malfunction of the A/C-ECU

｠

Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

｠

MB991223: Harness Set

｠

MB992006: Extra Fine Probe

｠

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

｠

MB991824: V.C.I.

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the 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. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.55A-6."

(2)

Turn the ignition switch to the "ON" position.

(3)

Diagnose the CAN bus line.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the CAN bus line found to be normal?

YES:

 Go to Step 2.

NO:

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

Diagnosis P.54D-17).

STEP 2. Using scan tool MB991958 read the Audio
diagnostic trouble code.
Check whether an audio DTCs are set or not.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check for Audio DTCs.

55A-54

AIR CONDITIONING

MANUAL A/C DIAGNOSIS