Mitsubishi 380. Manual - part 180

 

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Mitsubishi 380. Manual - part 180

 

 

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-16

DTC B1011, B1012: Ambient Air Temperature Sensor System

CAUTION

If DTC B1011 or B1012 has been set, multi-dis-
play related DTC U1130 is also set. After B1011 or 
B1012 has been diagnosed, don't forget to erase 
DTC U1130.

.

DTC SET CONDITION

• DTC B1011 is set if there is a short circuit in the 

ambient air temperature sensor input circuit.

• DTC B1012 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 sen-

sor, or connector(s) or wiring between the two 
may be defective.

Past trouble

• If DTC B1011 or B1012 is stored as a past trou-

ble, 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 sen-

sor.

• Malfunction of the A/C-ECU.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

AC305210

A-25 (BR)

AQ

CONNECTOR: A-25

25DB145A

CONNECTORS: C-15, C-16

C-16 

HARNESS SIDE

C-16

C-15

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

C-23

C-15

C-23

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-17

DIAGNOSIS

Required Special Tool:

•  : Diagnostic Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN 

communication system)

STEP 1. Using diagnostic tool , diagnose the CAN bus line.
Use diagnostic tool  to diagnose the CAN bus lines.
(1) Connect diagnostic tool  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-405

). Then go to Step 8.

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.00-14

.

NO :  Go to Step 3. 

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-18

STEP 3. Using diagnostic tool , check data list item 58: 
Outside air temperature sensor.

CAUTION

To prevent damage to diagnostic tool , always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool  to the data link connector.
(2) Start the engine.
(3) Set diagnostic tool  to the data reading mode for item 58: 

Outside air temperature sensor.

• Check that the ambient temperature matches the dis-

played value on the diagnostic tool.

NOTE: When this DTC is set and the system is fail-safe sta-
tus, the value of service data displays 20

°C.

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

Q: Is the sensor within the specified range?

YES : Replace the A/C-ECU. Then go to Step 8.
NO :  Go to Step 4.

STEP 4. Check ambient air temperature sensor connector 
A-25 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.
Q: Is ambient air temperature sensor connector A-25 in 

good condition?
YES : 
Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Then g

to Step 8.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305210

A-25 (BR)

HARNESS SIDE

CONNECTOR: A-25

AP

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-19

STEP 5. Check the ambient air temperature sensor.
(1) Disconnect ambient air temperature sensor connector A-25.

(2) Measure the resistance between the sensor terminals 

under at least two temperatures. The resistance values 
should meet the values shown.

NOTE: The temperature should be within the shown range.

Q: Is the ambient air temperature sensor in good 

condition?
YES : 
Go to Step 6.
NO :  Replace the ambient air temperature sensor. Then go 

to Step 8.

STEP 6. Check A/C-ECU connector C-15 and C-16 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are A/C-ECU connectors C-15 and C-16 in good 

condition?
YES : 
Go to Step 7.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Then g

to Step 8.

AC305210

A-25 (BR)

HARNESS SIDE

CONNECTOR: A-25

AP

AC209942AB

REGISTANCE 
kΩ

10

20

30

40

0

0

20

(32) (68)

TEMPERATURE ˚C (˚F)

40

(104)

60

(140)

-20

(-4)

-30

(-22)

25DB070A

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

 

 

 

 

 

 

 

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