B1446/46
Diagnostic trouble codes
DESCRIPTION
The air mix damper servo sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (driver seat) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver seat side is controlled.- HINT:
- Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.
| DTC No. |
DTC Detection Condition |
Trouble Area |
| B1446/46 |
Air mix damper position sensor value does not change even if air conditioner amplifier operates air mix control servo motor |
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1. READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the intelligent tester main switch on.
Operate the driver side temperature adjustment switch.
Select the item below in the Data List, and read the display on the intelligent tester.
| Item |
Measurement Item / Display (Range) |
Normal Condition |
Diagnostic Note |
| Air Mix Servo Targ Pulse (D) (Air Mix Pulse-D) |
Driver side air mix servo motor target pulse / Min.: 0, Max.: 255 |
MAX. COLD: 5 (pulse) MAX. HOT: 104 (pulse) |
- |
- OK:
- The display is as specified in the normal condition column.
- Result:
Result
Proceed to
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC)
C
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| A | |
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| 2. REPLACE AIR MIX CONTROL SERVO MOTOR |
- HINT:
- Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.
Check for DTCs.
- Result:
Result
Proceed to
DTC B1446/46 is output
A
DTC B1446/46 is not output
B
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| A | ||
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