RM38T0EC _58 Vehicle Interior _104612 HEATING / AIR CONDITIONING _0601796 AIR CONDITIONING SYSTEM(for HEV Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HEV Model)  B144C7F  Front Left Air Mix Damper Control Servo Motor Actuator Stuck Off  


DESCRIPTION

The No. 1 air conditioning radiator 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 air outlet damper to the appropriate position, which controls the air outlet switching.

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B144C7F Front Left Air Mix Damper Control Servo Motor Actuator Stuck Off Diagnosis Condition:

No. 1 air conditioning radiator damper servo sub-assembly operating


Malfunction Status:

Damper servo operation request signals are output but the damper position sensor value does not change or abnormal


Detection Time:

Continuously for 30 seconds or more


·

No. 1 air conditioning radiator damper servo sub-assembly

·

Air conditioning harness assembly

·

Air conditioning radiator assembly


Memorized

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition No. 1 air conditioning radiator damper servo sub-assembly operating ○ ○
Malfunction Damper servo operation request signals are output but the damper position sensor value does not change ○ -
Damper servo operation request signals are output but the 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

w/ Rear Air Duct
E521188E15
1.865,1.208 2.177,1.406 0.313,0.198 10 false IC 0.448,2.552 2.354,3.125 1.906,0.573 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 3.167,2.573 4.708,3.177 1.542,0.604 10 false Air Conditioning Harness Assembly 5.396,2.563 6.969,3.25 1.573,0.688 10 false Air Conditioning Amplifier Assembly 0.76,3.333 3.083,3.677 2.323,0.344 10 false : LIN Communication Line 6.229,0.5 6.542,0.698 0.313,0.198 10 false +B 6.625,1.177 6.938,1.375 0.313,0.198 10 false IC 5.417,0.563 6.188,0.76 0.771,0.198 10 false B BUS 5.417,1.083 5.875,1.281 0.458,0.198 10 false BUS 5.406,1.604 6.177,1.802 0.771,0.198 10 false BUS G 0.469,2.094 1.667,2.375 1.198,0.281 10 false Front Air Mix LH

w/o Rear Air Duct
E521188E20
1.865,1.208 2.177,1.406 0.313,0.198 10 false IC 0.448,2.552 2.354,3.125 1.906,0.573 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 3.167,2.573 4.708,3.177 1.542,0.604 10 false Air Conditioning Harness Assembly 5.396,2.563 6.969,3.25 1.573,0.688 10 false Air Conditioning Amplifier Assembly 0.76,3.333 3.083,3.677 2.323,0.344 10 false : LIN Communication Line 6.229,0.5 6.542,0.698 0.313,0.198 10 false +B 6.625,1.177 6.938,1.375 0.313,0.198 10 false IC 5.417,0.563 6.188,0.76 0.771,0.198 10 false BUSB 5.417,1.083 5.875,1.281 0.458,0.198 10 false BUS 5.406,1.604 6.177,1.802 0.771,0.198 10 false BUSG 0.469,2.094 1.667,2.375 1.198,0.281 10 false Front Air Mix LH

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 HEV 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 HEV Model)>INITIALIZATION



PROCEDURE

1.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
B144C7F is output A
DTCs in conjunction with No. 1 air conditioning radiator damper servo sub-assembly are output at same time B



A

2.CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

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


2.CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)
a.

Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

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

OK:

The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.



Result:
Proceed to
OK
NG



OK

3.CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

NG

INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

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


3.CHECK NO. 1 AIR CONDITIONING RADIATOR 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

4.PERFORM ACTIVE TEST USING GTS

NG

REMOVE PINCHED WIRE HARNESS

4.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, perform the following Active Test and read the Data List value.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Left Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 165 to 257
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
Max.: 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Front Left Air Mix Damper Control Servo Motor
Data List Display
Front Left Air Mix Damper Control Servo Motor Actual Pulse
50004 450 26 201
OK:

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



Result:
Proceed to
OK
NG



OK

5.PERFORM ACTIVE TEST USING GTS

NG

6.PERFORM ACTIVE TEST USING GTS
5.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, perform the following Active Test and read the Data List value.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Left Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 165 to 257
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Left Air Mix Damper Control Servo Motor Target Pulse No. 1 air conditioning radiator damper servo sub-assembly target pulse Min.: 128
Max.: 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


-
Front Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
Max.: 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Front Left Air Mix Damper Control Servo Motor
Data List Display
Front Left Air Mix Damper Control Servo Motor Target Pulse
Front Left Air Mix Damper Control Servo Motor Actual Pulse
50004 450 26 200,201
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

7.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY
6.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, perform the following Active Test and read the Data List value.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Right Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 255 to 347
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Right Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
Max.: 384
·

MAX COLD: 255 (pulse)

·

MAX HOT: 347 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Front Right Air Mix Damper Control Servo Motor
Data List Display
Front Right Air Mix Damper Control Servo Motor Actual Pulse
50004 450 28 205
OK:

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



Result:
Proceed to
OK
NG



OK

7.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

9.CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)
7.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

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

Result:
Proceed to
NEXT



NEXT

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

Using the GTS, perform the following Active Test and read the Data List value.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Left Air Mix Damper Control Servo Motor No. 1 air conditioning radiator damper servo sub-assembly operation Min.: 128
Max.: 384 		Operates between 165 to 257
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
Max.: 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Front Left Air Mix Damper Control Servo Motor
Data List Display
Front Left Air Mix Damper Control Servo Motor Actual Pulse
50004 450 26 201
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>AIR CONDITIONING UNIT>DISASSEMBLY


9.CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)
a.

Remove the No. 1 air conditioning radiator damper servo sub-assembly.

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


b.

Operate the dampers by hand.

OK:

The dampers are easily operated by hand.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT>REMOVAL