AIR CONDITIONING SYSTEM, Diagnostic DTC:B1493/93

DESCRIPTION

The max hot bypass damper servo motor (for COOL) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the max hot bypass damper servo motor (for COOL) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver's head area is controlled.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

   
   

   1. Clear the DTCs Click here.

   2. Check for DTCs Click here.

      Result

      Result	Proceed to
      DTC B1493/93 is not output	A
      DTC B1493/93 is output	B
      DTC B1493/93 and B1497/97 are output	C

   
   

   B

   READ VALUE USING INTELLIGENT TESTER (MAX HOT BYPASS DAMPER SERVO MOTOR TARGET PULSE (for COOL)) Click here

   C

   GO TO DTC B1497/97 Click here

   A

   USE SIMULATION METHOD TO CHECK Click here

2. READ VALUE USING INTELLIGENT TESTER (MAX HOT BYPASS DAMPER SERVO MOTOR TARGET PULSE (for COOL))

   
   

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

      Air conditioner

      Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
      M/H Bypass COOL Targ Pls	Max hot bypass servo motor COOL target pulse / for LHD Min.: 51, Max.: 63 for RHD Min.: 67, Max.: 78	for LHD: Shut: 63 (pulse) Open: 51 (pulse) for RHD: Shut: 67 (pulse) Open: 78 (pulse)	-

      OK
      The display is as specified in the normal condition.

   2. Visually inspect the max hot bypass servo motor (for COOL).

      
      

      1. Visually inspect whether the max hot bypass servo motor (for COOL) operates.

         OK
         The max hot bypass servo motor (for COOL) operates.

         Result

         Result	Proceed to
         The Data List value changes and the max hot bypass servo motor (for COOL) operates (When troubleshooting according to the DTC output)	A
         The Data List value changes and the max hot bypass servo motor (for COOL) operates (When troubleshooting according to Problem Symptoms Table)	B
         The Data List value does not change and the max hot bypass servo motor (for COOL) does not operate	C
         The Data List value changes, but the max hot bypass servo motor (for COOL) does not operate	D

   
   

   B

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   C

   REPLACE AIR CONDITIONING AMPLIFIER Click here

   D

   CHECK MAX HOT BYPASS SERVO MOTOR (for COOL) Click here

   A

3. CHECK FOR DTC

   
   

   1. Clear the DTCs Click here.

   2. Check for DTCs Click here.

      OK
      DTC B1493/93 is not output.

   
   

   NG

   REPLACE AIR CONDITIONING AMPLIFIER Click here

   OK

   USE SIMULATION METHOD TO CHECK Click here

4. CHECK MAX HOT BYPASS SERVO MOTOR (for COOL)

   
   

   1. Replace the max hot bypass servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

   2. Clear the DTCs Click here.

   3. Check for DTCs Click here.

      OK
      DTC B1493/93 is not output.

   
   

   NG

   CHECK AIR CONDITIONING HARNESS Click here

   OK

   END (MAX HOT BYPASS SERVO MOTOR (for COOL) IS FAULTY)

5. CHECK AIR CONDITIONING HARNESS

   
   

   1. Replace the air conditioning harness Click here.

   2. Clear the DTCs Click here.

   3. Check for DTCs Click here.

      OK
      DTC B1493/93 is not output.

   
   

   NG

   REPLACE AIR CONDITIONING AMPLIFIER Click here

   OK

   END (AIR CONDITIONING HARNESS IS FAULTY)