AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1441/41

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DESCRIPTION

The air mix control servo motor (for front passenger side) 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 the signals to move the air mix damper (for front passenger side) to any position. As a result, the air mix damper (for front passenger side) varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air blowing toward the front passenger side is as requested.

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTCs (Click here).

   2. Check for DTCs (Click here).

      Table 1. Result

      Result	Proceed to
      DTC B1441/41 is not output	A
      DTC B1441/41 is output	B
      DTC B1441/41 and B1497/97 are output	C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   READ VALUE USING INTELLIGENT TESTER

   
   

   1. Use the Data List to check if the air mix control servo motor is functioning properly.

      Table 2. Air Conditioner

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Air Mix Servo Targ Pulse (P)	Air mix control servo motor (for front passenger side) target pulse / Min.: 0, Max.: 255	for LHD: 6 (pulse): MAX COOL 93 (pulse): MAX HOT for RHD: 92 (pulse): MAX COOL 5 (pulse): MAX HOT	-
      Air Mix Servo Actual Pulse (P)	Air mix control servo motor (for front passenger side) actual pulse / Min.: 0, Max.: 255	for LHD: 6 (pulse): MAX COOL 93 (pulse): MAX HOT for RHD: 92 (pulse): MAX COOL 5 (pulse): MAX HOT	-

      OK
      The display is as specified in the normal condition column.

      Table 3. Result

      Result	Proceed to
      OK (When troubleshooting according to the DTC)	A
      OK (When troubleshooting according to Problem Symptoms Table)	B
      Both target pulse and actual pulse do not display	C
      Target pulse displays normally, but actual pulse does not display	D

   
   
   • AClick here
   • BClick here
   • CClick here
   • DClick here
3. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTCs (Click here).

   2. Check for DTCs (Click here).

      OK
      DTC B1441 is not output.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK AIR MIX CONTROL SERVO MOTOR (FOR FRONT PASSENGER SIDE)

   
   

   1. Replace the air mix control servo motor (for front passenger side) (Click here).

      Tip:

      Since the air mix control servo motor (for front passenger side) cannot be inspected while it is removed from the vehicle, replace the air mix control servo motor with a new or normally functioning one.

   2. Clear the DTCs (Click here).

   3. Check for DTCs (Click here).

      OK
      DTC B1441 is not output.

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK AIR CONDITIONING HARNESS ASSEMBLY

   
   

   1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one (Click here).

   2. Clear the DTCs (Click here).

   3. Check for DTCs (Click here).

      OK
      DTC B1441 is not output.

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

7. Click here

   END (AIR MIX CONTROL SERVO MOTOR [FOR FRONT PASSENGER SIDE] IS FAULTY)

8. Click here

   END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

9. Click here

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

10. Click here

    USE SIMULATION METHOD TO CHECKClick here

11. Click here

    GO TO DTC B1497/97Click here