Toyota Corolla Cross: Front Left Air Mix Damper Control Servo Motor Actuator Stuck Off (B144C7F)
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:
Malfunction Status:
Detection Time:
|
| Memorized |
|
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
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.
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- This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.
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PROCEDURE
|
1. | 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 here
OK:
The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
| NG | .gif) | INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY |
|
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| 2. |
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.
| NG | | REMOVE PINCHED WIRE HARNESS |
|
| 3. |
CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER) |
(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.
Click here
(b) Operate the dampers by hand.
OK:
The dampers are easily operated by hand.
| OK | | REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
| NG | | REPLACE AIR CONDITIONING RADIATOR ASSEMBLY |
