RM36D0EC _58 Vehicle Interior _083104 HEATING / AIR CONDITIONING _0402828 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 air inlet damper to the appropriate position, which controls the air inlet 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
B143B7F Air Inlet Damper Control Servo Motor Actuator Stuck Off
Diagnosis Condition:

No. 1 blower 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 blower damper servo sub-assembly

·

Air conditioning harness assembly

·

Blower assembly

·

Air conditioning amplifier assembly


Memorized

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition No. 1 blower 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

E396770E01
5.042,0.708 5.813,0.906 0.771,0.198 10 false BUS 5.031,1.094 5.802,1.292 0.771,0.198 10 false B BUS 5.052,1.49 5.823,1.688 0.771,0.198 10 false BUS G 4.76,0.677 5.01,0.875 0.25,0.198 10 false 3 4.76,1.104 5.01,1.302 0.25,0.198 10 false 4 4.771,1.479 5.021,1.677 0.25,0.198 10 false 2 1.042,1.135 1.75,1.573 0.708,0.438 10 false Driver Side Air Mix 0.99,3.958 2.063,4.177 1.073,0.219 10 false Front Mode 0.771,4.896 2.688,5.563 1.917,0.667 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 0.875,7.5 2.573,8 1.698,0.5 10 false No. 1 Blower Damper Servo Sub-assembly 3.156,7.438 4.698,7.875 1.542,0.438 10 false Air Conditioning Harness Assembly 4.729,8.083 5.5,8.281 0.771,0.198 10 false z11 4.719,8.25 6.99,8.5 2.271,0.25 10 false Air Conditioning Amplifier Assembly 0.885,8.563 3.26,8.823 2.375,0.26 10 false : LIN Communication Line 6.021,0.823 6.792,1.021 0.771,0.198 10 false IC 6.333,0.938 7.104,1.135 0.771,0.198 10 false +B 0.75,2.448 1.823,2.802 1.073,0.354 10 false Front Passenger Side Air Mix

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
B143B7F 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 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

B

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

for M20C-FKS:Vehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for M20C-FKS)>DISASSEMBLY

for M20D-FKS:Vehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for M20D-FKS)>DISASSEMBLY



2.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:

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



Result:
Proceed to
OK
NG



OK

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

NG

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

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


3.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

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
Air Inlet Damper Control Servo Motor No. 1 blower damper servo sub-assembly operation 128 to 384 Operates between 235 to 258 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min: 128
Max: 384
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


-
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

5.PERFORM ACTIVE TEST USING GTS

NG

8.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
Air Inlet Damper Control Servo Motor No. 1 blower damper servo sub-assembly operation 128 to 384 Operates between 235 to 258 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Control Servo Motor Target Pulse No. 1 blower damper servo sub-assembly target pulse Min: 128
Max: 384
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


-
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min: 128
Max: 384
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


-
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

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

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
Air Inlet Damper Control Servo Motor No. 1 blower damper servo sub-assembly operation 128 to 384 Operates between 220 to 256 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Control Servo Motor Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min: 128
Max: 384
·

Recirculation: 256 (pulse)

·

Fresh: 220 (pulse)


-
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

for M20C-FKS:Vehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for M20C-FKS)>DISASSEMBLY

for M20D-FKS:Vehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for M20D-FKS)>DISASSEMBLY



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
Fr Control Rear Air Outlet Damper Servo Motor No. 2 air conditioning radiator damper servo sub-assembly operation 128 to 384 Operates between 158 to 260 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Control Rear Air Outlet Damper Control Servo Motor Actual Pulse No. 2 air conditioning radiator damper servo sub-assembly actual pulse Min: 128
Max: 384
·

FACE: 260 (pulse)

·

FOOT-R, D, O, F/D: 223 (pulse)

·

B/L: 212 (pulse)

·

FOOT-F: 182 (pulse)

·

D/F: 177 (pulse)

·

DEF/S-FLOW: 158 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Fr Control Rear Air Outlet Damper Servo Motor
Data List Display
Front Control Rear Air Outlet Damper Control Servo Motor Actual Pulse
50004 450 49 247
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)
9.CHECK BLOWER ASSEMBLY (DAMPER)

Pre-procedure1

a.

Remove the No. 1 blower damper servo sub-assembly.

HINT:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER 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

REPLACE BLOWER ASSEMBLY

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