Mitsubishi Outlander GS45X. Manual — part 998

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-19

STEP 4. Check the wiring harness between A/C-ECU
connector C-109 (terminal 9) and A/C control panel
connector C-119 (terminal 9).

• Check the AC control panel signal line for open and short

circuit.

Q: Is the wiring harness between A/C-ECU connector

C-109 (terminal 9) and A/C control panel connector
C-119 (terminal 9) in good condition?
YES : Go to Step 5.
NO : Repair the wiring harness.

STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the check result satisfactory?

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 : Replace the A/C control panel. Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the check result satisfactory?

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 : Replace the A/C-ECU.

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-20

DTC B1018: Temperature Control Dial SW Error

.

DTC SET CONDITION

DTC B1018 will be set when the A/C-ECU cannot
receive the signal of temperature adjustment knob.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The A/C-ECU, the A/C control panel, or connec-

tor(s) or wiring between the two may be defec-
tive.

Past trouble

• If DTC B1018 is stored as a past trouble, carry

out diagnosis with particular emphasis on wiring
and connector(s) between the A/C-ECU and the
A/C control panel. 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.

.

TROUBLESHOOTING HINT

• Malfunction of connector.

• Malfunction of the harness.

• Malfunction of the A/C control panel.

• Malfunction of the A/C-ECU.

DIAGNOSIS

Required Special Tool:

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

• MB991824: Vehicle Communication Interface (V.C.I.)

AC901231

A/C-ECU

CPU

A/C Control Panel Circuit

INTERFACE
CIRCUIT

A/C
CONTROL
PANEL

AC702208

Connector: C-109, C-119

C-119

C-109 (B)

AE

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-21

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the 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. Refer to "How to connect the

Scan Tool (M.U.T.-III)

P.55A-7

."

(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 54C,

Diagnosis

P.54C-17

).

STEP 2. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the check result satisfactory?

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 : Go to Step 3.

STEP 3. Check A/C control panel connector C-119 and
A/C-ECU connector C-109 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are A/C control panel connector C-119 and A/C-ECU

connector C-109 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-22

STEP 4. Check the wiring harness between A/C-ECU
connector C-109 (terminal 9) and A/C control panel
connector C-119 (terminal 9).

• Check the A/C control panel signal line for open and short

circuit.

Q: Is the wiring harness between A/C-ECU connector

C-109 (terminal 9) and A/C control panel connector
C-119 (terminal 9) in good condition?
YES : Go to Step 5.
NO : Repair the wiring harness.

STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the check result satisfactory?

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 : Replace the A/C control panel. Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the check result satisfactory?

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 : Replace the A/C-ECU.