Mitsubishi Outlander XL. Manual - part 1183

DTC B1031, B1032: Air Thermo Sensor System

M15502000938USA0000010000

Air Thermo Sensor Circuit

A/C-ECU

AIR THERMO
SENSOR

ZC600876

Connector: C-109, C-118

C-108 (B) 

C-118

0035

DTC SET CONDITION

｠

DTC B1031 is set if there is a short circuit in the air
thermo sensor input circuit.

｠

DTC B1032 is set if there is a defective connector
connection,  or  if  there  is  an  open  circuit  in  the
harness.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

｠

The A/C-ECU, the air thermo sensor, or connector
(s) or wiring between the two may be defective.

Past trouble

｠

If DTC B1031 or B1032 is stored as a past trouble,
carry  out  diagnosis  with  particular  emphasis  on
wiring and connector(s) between the A/C-ECU and
the air thermo sensor. 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 air thermo sensor.

｠

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.)

AIR CONDITIONING

55A-23

MANUAL A/C DIAGNOSIS

｠

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

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. 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 air thermo sensor connector C-118 and A/C-
ECU connector C-108 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

Q:Are  air  thermo  sensor  connector  C-118  and  A/C-ECU

connector C-108 in good condition?

YES:

 Go to Step 4.

NO:

 Repair or replace the connector. Refer to GROUP 00E,

Harness Connector Inspection P.00E-2.

55A-24

AIR CONDITIONING

MANUAL A/C DIAGNOSIS

STEP 4. Check the wiring harness between A/C-ECU
connector C-108 (terminal 22 and 21) and air thermo sensor
connector C-118 (terminals 1 and 2).

Q:Is the wiring harness between A/C-ECU connector C-108

(terminal  22  and  21)  and  air  thermo  sensor  connector

C-118 (terminals 1 and 2) in good condition?

YES:

 Go to Step 5.

NO:

 Repair the wiring harness.

STEP 5. Check the air thermo sensor.

ZC600446

(k

W

)

0000

-10

0

10

20 30 40

0

5

10

15

20

25

Resistance

Temperature °C (°F)

(14) (32) (50) (68) (86) (104)

Measure the resistance between connector terminals 1 and 2
under at least two different temperatures. The resistance values
should generally match those in the graph.

NOTE: 

The temperature at the check should not exceed the

range in the graph.

Q:Is the air thermo sensor in good condition?

YES:

 Replace the A/C-ECU. Then go to Step 6.

NO:

 Replace the air thermo sensor. Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.
Check again if the DTC is set.

(1)

Connect scan tool MB991958 to the data link connector

(2)

Turn the ignition switch to the "ON" position.

(3)

Check if the DTC is set.

(4)

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

Q:Is the check result satisfactory?

YES:

 The procedure is complete.

NO:

 Return to Step 1.

AIR CONDITIONING

55A-25

MANUAL A/C DIAGNOSIS

DTC B1034, B1035: Ambient air temperature Sensor System

M15502000936USA0000010000

Ambient Temperature Sensor Circuit 

AMBIENT AIR
TEMPERATURE
SENSOR

ETACS-ECU

ANALOG
INTERFACE
CIRCUIT

ZC6008720011

Connector: A-44

A-44 (B)

ZC600878

Connector: C-317

 

DTC SET CONDITION

｠

DTC  B1034  is  set  if  there  is  a  short  circuit  in  the
ambient air temperature sensor input circuit.

｠

DTC B1035 is set if there is a defective connector
connection,  or  if  there  is  an  open  circuit  in  the
harness.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

｠

The A/C-ECU, the ambient air temperature sensor,
or connector(s) or wiring between the two may be
defective.

Past trouble

｠

If DTC B1034 or B1035 is stored as a past trouble,
carry  out  diagnosis  with  particular  emphasis  on
wiring and connector(s) between the A/C-ECU and
the  ambient  air  temperature  sensor.  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 ambient air temperature sensor.

｠

Malfunction of the A/C-ECU.

55A-26

AIR CONDITIONING

MANUAL A/C DIAGNOSIS