Mitsubishi Outlander GS45X. Manual — part 996

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-11

DIAGNOSTIC TROUBLE CODE CHART

M1554004902180

CAUTION

During diagnosis, a DTC code associated with
other system may be set when the ignition switch
is turned on with connector(s) disconnected. On
completion of repairs, check all systems for DTC
code(s). If DTC code(s) are set, erase them all.

NOTE: The diagnostic trouble codes marked by * are
set from the ETACS-ECU.

Diagnostic
trouble code No.

Diagnostic item

Reference
page

B1000

Control panel communication error

P.55A-12

B1003

Mode dial SW error

P.55A-16

B1018

Temperature control dial SW error

P.55A-20

B1021

Fan dial SW error

P.55A-23

B1031

Air thermo sensor system (short circuit)

P.55A-26

B1032

Air thermo sensor system (open circuit)

P.55A-26

B1034*

Ambient air temperature sensor system (short circuit)

P.55A-29

B1035*

Ambient air temperature sensor system (open circuit)

P.55A-29

B1079

Refrigerant leaks

P.55A-32

B2214

Control panel failure

P.55A-36

B223B

Control panel improperly assembled

P.55A-39

U1415

Coding not completed

P.55A-39

U0019

Bus off (CAN1)

P.55A-44

U0141

ETACS-ECU time-out

P.55A-45

U0151

SRS-ECU time-out

P.55A-47

U0154

Occupant classification-ECU time-out

P.55A-49

U0155

Combination meter time-out

P.55A-52

U0168

WCM time-out

P.55A-54

U0184

Audio time-out

P.55A-57

U0195

Satellite radio tuner time-out

P.55A-59

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-12

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC B1000: Control Panel Communication Error

.

DTC SET CONDITION

DTC B1000 will be set when the communication
between A/C-ECU and A/C control panel cannot be
performed.

.

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.

AC901217

A/C-ECU

CPU

POWER
SUPPLY

INTERFACE
CIRCUIT

A/C
CONTROL
PANEL

ETACS-ECU

AC702208

Connector: C-109, C-119

C-119

C-109 (B)

AE

AC701632 AM

Connector: C-317

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-13

Past trouble

• If DTC B1000 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.)

• 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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?

YES : Go to Step 2.
NO : Repair the CAN bus lines. Repair the CAN bus lines

(Refer to GROUP 54C, Diagnosis-Can Bus
Diagnostic Chart

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.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-14

STEP 3. Check A/C control panel connector C-119 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is A/C control panel connector C-119 in good condition?

YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

.

STEP 4. Measure the voltage at A/C control panel
connector C-119.
(1) Disconnect A/C control panel connector C-119, and

measure the voltage at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 6 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES : Go to Step 6.
NO : Go to Step 5.

STEP 5. Check the wiring harness between A/C control
panel connector C-119 (terminal 6) and ETACS-ECU
connector C-317 (terminal 5).

• Check the A/C control panel power supply line for open cir-

cuit.

Q: Is the wiring harness between A/C control panel

connector C-119 (terminal 6) and ETACS-ECU connector
C-317 (terminal 5) in good condition?
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 wiring harness.

AC608254BSS

Harness side: C-119