RM38N0EC _58 Vehicle Interior _111841 HEATING / AIR CONDITIONING _0499788 AIR CONDITIONING SYSTEM(for Gasoline Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  B143B7F  Air Inlet Damper Control Servo Motor Actuator Stuck Off  


DESCRIPTION

The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position.

The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 1 blower damper servo sub-assembly to the appropriate position to change the air inlet mode (fresh, recirculation/fresh, and recirculation).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from Priority
B143B7F Air Inlet Damper Control Servo Motor Actuator Stuck Off Diagnosis Condition:

No. 1 blower damper servo sub-assembly operating


Malfunction:
·

Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change.

·

Air inlet damper servo operation request signals are output but the air inlet damper position sensor value is abnormal.


Detection Time:

Continuously for 30 seconds or more


·

No. 1 blower damper servo sub-assembly

·

No. 1 air conditioning radiator damper servo sub-assembly

·

Air conditioning harness assembly

·

Blower assembly


Memorized Air Conditioner A

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition No. 1 blower damper servo sub-assembly operating ○ ○
Malfunction Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change. ○ -
Air inlet damper servo operation request signals are output but the air inlet damper position sensor value is abnormal. - ○
Detection Time Continuously for 30 seconds or more Continuously for 30 seconds or more
Trip Count 1 trip 1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.


WIRING DIAGRAM

E432281E05
0.375,4.563 1.698,4.979 1.323,0.417 10 false No. 1 Blower Damper Servo Sub-assembly 5.854,2.302 6.167,2.5 0.313,0.198 10 false IC 5.167,4.542 7.052,4.948 1.885,0.406 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 0.729,5.385 2.552,5.635 1.823,0.25 10 false : LIN Communication Line 2.563,4.594 4.083,5.021 1.521,0.427 10 false Air Conditioning Harness Assembly 0.906,1.615 2.448,1.99 1.542,0.375 10 false Air Conditioning Amplifier Assembly 1.75,0.51 2.208,0.708 0.458,0.198 10 false BUS 1.604,0.917 2.219,1.115 0.615,0.198 10 false B BUS 1.604,1.313 2.208,1.521 0.604,0.208 10 false BUS G 2.281,2.75 2.438,2.948 0.156,0.198 10 false 1 2.281,2.344 2.438,2.542 0.156,0.198 10 false 2 2.281,3.146 2.438,3.344 0.156,0.198 10 false 3 2.292,3.542 2.448,3.74 0.156,0.198 10 false 4 2.281,3.938 2.438,4.135 0.156,0.198 10 false 5 4.885,2.75 5.042,2.948 0.156,0.198 10 false 4 1.813,3.625 2.125,3.823 0.313,0.198 10 false M+ 1.813,4.021 2.125,4.219 0.313,0.198 10 false M- 1.719,2.823 2.135,3.021 0.417,0.198 10 false GND 2.271,2.542 2.427,2.74 0.156,0.198 10 false B 2.271,2.938 2.427,3.135 0.156,0.198 10 false B 2.271,3.333 2.427,3.531 0.156,0.198 10 false B 2.271,3.729 2.427,3.927 0.156,0.198 10 false B 2.271,4.125 2.427,4.323 0.156,0.198 10 false B 4.875,2.542 5.031,2.74 0.156,0.198 10 false A 4.875,2.938 5.031,3.135 0.156,0.198 10 false A 4.875,3.333 5.031,3.531 0.156,0.198 10 false A 4.875,3.729 5.031,3.927 0.156,0.198 10 false A 4.875,4.125 5.031,4.323 0.156,0.198 10 false A 5.198,3.615 5.51,3.813 0.313,0.198 10 false M+ 5.208,4 5.521,4.198 0.313,0.198 10 false M- 1.74,3.219 2.177,3.417 0.438,0.198 10 false sigB 5.198,2.438 5.635,2.635 0.438,0.198 10 false STE1 5.198,2.833 5.615,3.031 0.417,0.198 10 false GND 4.875,1.323 5.031,1.521 0.156,0.198 10 false A 4.875,0.927 5.031,1.125 0.156,0.198 10 false A 4.875,0.51 5.031,0.708 0.156,0.198 10 false A 4.896,2.344 5.052,2.542 0.156,0.198 10 false 5 4.885,3.146 5.042,3.344 0.156,0.198 10 false 6 4.885,3.531 5.042,3.729 0.156,0.198 10 false 7 4.885,3.927 5.042,4.125 0.156,0.198 10 false 8 2.229,0.51 2.563,0.75 0.333,0.24 10 false z1 2.24,0.927 2.573,1.167 0.333,0.24 10 false z1 2.229,1.313 2.563,1.552 0.333,0.24 10 false z1 2.271,0.313 2.427,0.51 0.156,0.198 10 false 3 2.281,0.74 2.438,0.938 0.156,0.198 10 false 4 2.271,1.135 2.427,1.333 0.156,0.198 10 false 2 4.885,0.323 5.042,0.521 0.156,0.198 10 false 2 4.875,0.729 5.031,0.927 0.156,0.198 10 false 1 4.885,1.125 5.042,1.323 0.156,0.198 10 false 3 5.219,0.354 5.677,0.552 0.458,0.198 10 false BUS 5.219,0.802 5.833,1 0.615,0.198 10 false B BUS 5.219,1.188 5.823,1.396 0.604,0.208 10 false BUS G 1.75,2.427 2.188,2.625 0.438,0.198 10 false sigA 5.198,3.219 5.635,3.417 0.438,0.198 10 false STE2

CAUTION / NOTICE / HINT

NOTICE:
·

This DTC is also output for the damper link, damper lock, etc. Before performing inspection, perform servomotor initialization and check that there are no mechanical malfunctions.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model)>INITIALIZATION

·

This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model)>INITIALIZATION



PROCEDURE

1.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)
a.

Check that the No. 1 blower damper servo sub-assembly is installed correctly.

HINT:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER UNIT>REASSEMBLY


OK:

No. 1 blower damper servo sub-assembly is installed correctly.



Result:
Proceed to
OK
NG



OK

2.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER UNIT>REASSEMBLY


2.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)
a.

Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.



Result:
Proceed to
OK
NG



OK

3.PERFORM ACTIVE TEST USING GTS

NG

REMOVE PINCHED WIRE HARNESS

3.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Air Inlet Damper Control Servo Motor This test activates the air inlet damper control servo motor.
(No. 1 blower damper servo sub-assembly) 		128: Min
384: Max 		Operate with the ignition switch ON.
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Inspection Item
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse 128 to 384
·

Fresh: 220 (pulse)

·

Recirculation: 256 (pulse)


No. 1 blower damper servo sub-assembly circuit malfunction
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Control Servo Motor
Data List Display
Air Inlet Damper Control Servo Motor Actual Pulse
50004 450 32 213
OK:

The value of the Data List changes in accordance with the operation of the Active Test.



Result:
Proceed to
OK
NG



OK

4.PERFORM ACTIVE TEST USING GTS

NG

8.PERFORM ACTIVE TEST USING GTS
4.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Air Inlet Damper Control Servo Motor This test activates the air inlet damper control servo motor.
(No. 1 blower damper servo sub-assembly) 		128: Min
384: Max 		Operate with the ignition switch ON.
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Inspection Item
Air Inlet Damper Control Servo Motor Target Pulse No. 1 blower damper servo sub-assembly target pulse 128 to 384
·

Fresh: 220 (pulse)

·

Recirculation: 256 (pulse)


No. 1 blower damper servo sub-assembly circuit malfunction
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse 128 to 384
·

Fresh: 220 (pulse)

·

Recirculation: 256 (pulse)


No. 1 blower damper servo sub-assembly circuit malfunction
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Control Servo Motor
Data List Display
Air Inlet Damper Control Servo Motor Target Pulse
Air Inlet Damper Control Servo Motor Actual Pulse
50004 450 32 212,213
OK:

The target pulse value of the Data List matches the actual pulse.



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

5.INSPECT AIR CONDITIONING HARNESS ASSEMBLY
5.INSPECT AIR CONDITIONING HARNESS ASSEMBLY

Pre-procedure1

a.

Disconnect the A No. 1 air conditioning radiator damper servo sub-assembly connector.


b.

Disconnect the B No. 1 blower damper servo sub-assembly connector.


Procedure1

c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A-6 (STE2) - B-3 (sigB) Always Below 1 Ω
A-5 (STE1) - B-2 (sigA) Always Below 1 Ω
A-8 (M-) - B-5 (M-) Always Below 1 Ω
A-7 (M+) - B-4 (M+) Always Below 1 Ω
A-4 (GND) - B-1 (GND) Always Below 1 Ω
A-6 (STE2) or B-3 (sigB) - Other terminals and body ground Always 10 kΩ or higher
A-5 (STE1) or B-2 (sigA) - Other terminals and body ground Always 10 kΩ or higher
A-8 (M-) or B-5 (M-) - Other terminals and body ground Always 10 kΩ or higher
A-7 (M+) or B-4 (M+) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

REPAIR AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT>DISASSEMBLY


6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY
HINT:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER UNIT>DISASSEMBLY


Result:
Proceed to
NEXT



NEXT

7.PERFORM ACTIVE TEST USING GTS
7.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Air Inlet Damper Control Servo Motor This test activates the air inlet damper control servo motor.
(No. 1 blower damper servo sub-assembly) 		128: Min
384: Max 		Operate with the ignition switch ON.
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Inspection Item
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse 128 to 384
·

Fresh: 220 (pulse)

·

Recirculation: 256 (pulse)


No. 1 blower damper servo sub-assembly circuit malfunction
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Control Servo Motor
Data List Display
Air Inlet Damper Control Servo Motor Actual Pulse
50004 450 32 213
OK:

The value of the Data List changes in accordance with the operation of the Active Test.



Result:
Proceed to
OK
NG



OK

END

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT>DISASSEMBLY


8.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Air Outlet Damper Control Servo Motor This test activates the front air outlet damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front side mode)) 		128: Min
384: Max 		Operate with the ignition switch ON.
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Inspection Item
Front Air Outlet Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly (front side mode) actual pulse 128 to 384
·

S-FLOW: 234 (pulse)

·

FACE: 256 (pulse)

·

B/L: 267 (pulse)

·

FOOT-A: 288 (pulse)

·

FOOT-R (F): 297 (pulse)

·

FOOT-D: 305 (pulse)

·

F/D-R: 320 (pulse)

·

D/F: 339 (pulse)

·

DEF: 348 (pulse)


No. 1 air conditioning radiator damper servo sub-assembly (front side mode) circuit malfunction
Body Electrical > Air Conditioner > Active Test
Active Test Display
Front Air Outlet Damper Control Servo Motor
Data List Display
Front Air Outlet Damper Control Servo Motor Actual Pulse
50004 450 47 243
OK:

The value of the Data List changes in accordance with the operation of the Active Test.



Result:
Proceed to
OK
NG



OK

6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

9.CHECK BLOWER ASSEMBLY (DAMPER)