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)  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.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from Priority
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:
·

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


·

No. 1 air conditioning radiator damper servo sub-assembly

·

Air conditioning harness assembly

·

Air conditioning radiator assembly


Memorized Air Conditioner A

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

E444987E01
5.51,9.271 7.063,9.656 1.552,0.385 10 false Air Conditioning Amplifier Assembly 0.74,9.417 2.927,9.646 2.188,0.229 10 false : LIN Communication Line 5.927,0.542 6.385,0.74 0.458,0.198 10 false TEA 5.917,0.75 6.375,0.948 0.458,0.198 10 false SGA 0.552,0.979 3.729,1.198 3.177,0.219 10 false Evaporator Temp. Sensor (No. 1 Cooler Thermistor) 1.021,2.531 3.927,2.781 2.906,0.25 10 false No. 1 Blower Damper Servo Sub-assembly 1.396,6.802 3.281,7.167 1.885,0.365 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 3.281,4.813 3.594,5.01 0.313,0.198 10 false IC 3.271,8.01 3.583,8.208 0.313,0.198 10 false IC 5.927,5.198 6.385,5.396 0.458,0.198 10 false BUS G 5.927,4.99 6.385,5.188 0.458,0.198 10 false B BUS 1.146,3.781 2.271,4.052 1.125,0.271 10 false Front Side Mode 1.188,4.802 2.104,5.219 0.917,0.417 10 false Front Left Side Air Mix 1.156,5.885 2.177,6.281 1.021,0.396 10 false Front Right Side Air Mix 1.146,7.99 2.281,8.25 1.135,0.26 10 false Rear Side Mode 3.729,8.99 4.906,9.344 1.177,0.354 10 false Air Conditioning Harness Assembly 5.927,4.604 6.385,4.802 0.458,0.198 10 false BUS 1.396,8.771 3.281,9.135 1.885,0.365 10 false No. 2 Air Conditioning Radiator Damper Servo Sub-assembly

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 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>FRONT 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.

HINT:

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


OK:

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

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

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT 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.

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 Left Air Mix Damper Control Servo Motor This test activates the front left air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix)) 		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 Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) actual pulse 128 to 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) circuit malfunction
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

8.PERFORM ACTIVE TEST USING GTS
5.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 Left Air Mix Damper Control Servo Motor This test activates the front left air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix)) 		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 Left Air Mix Damper Control Servo Motor Target Pulse No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) target pulse 128 to 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) circuit malfunction
Front Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) actual pulse 128 to 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) circuit malfunction
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

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

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING 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
Front Left Air Mix Damper Control Servo Motor This test activates the front left air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix)) 		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 Left Air Mix Damper Control Servo Motor Actual Pulse No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) actual pulse 128 to 384
·

MAX COLD: 257 (pulse)

·

MAX HOT: 165 (pulse)


No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix) circuit malfunction
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>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 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

NG

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

Pre-procedure1

a.

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

HINT:

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



Procedure1

b.

Operate the dampers by hand.

OK:

The dampers are easily operated by hand.


Result:
Proceed to
OK
NG



Post-procedure1

c.

None



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

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