AIR CONDITIONING SYSTEM, Diagnostic DTC:B1415/15

DESCRIPTION

The air duct sensor (for driver side) detects the register temperature and sends the appropriate signals to the air conditioning amplifier.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (DUCT SENSOR (for Driver Side))

   
   

   1. Use the Data List to check if the duct sensor (for driver side) is functioning properly.

      Air conditioner

      Tester Display	Measure Item / Range	Normal Condition	Diagnostic Note
      Duct Sensor (D Side)	Duct sensor (for driver side) / Min.: -12.7°C (9.14°F) Max.: 76.55°C (169.79°F)	Actual duct temperature is displayed (for driver side)	-

      OK
      The display is as specified in the normal condition.

   
   

   NG

   CHECK AIR CONDITIONING AMPLIFIER (TFAL - SG-2, TFAR-SG-3 VOLTAGE) Click here

   OK

   REPLACE AIR CONDITIONING AMPLIFIER Click here

2. CHECK AIR CONDITIONING AMPLIFIER (TFAL - SG-2, TFAR-SG-3 VOLTAGE)

   

   
   

   1. Remove the air conditioning amplifier with its connectors still connected Click here.

   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      for LHD Tester Connection Condition Specified Condition L77-21 (TFAL) - L77-12 (SG-2) Power switch ON (IG) at 25°C (77°F) 1.8 to 2.2 V Power switch ON (IG) at 50°C (122°F) 0.8 to 1.2 V
      for RHD Tester Connection Condition Specified Condition L77-22 (TFAR) - L77-11 (SG-3) Power switch ON (IG) at 25°C (77°F) 1.8 to 2.2 V Power switch ON (IG) at 50°C (122°F) 0.8 to 1.2 V

      Tech Tips

      As the temperature increases, the voltage decreases.

   
   

   NG

   CHECK AIR DUCT SENSOR Click here

   OK

   REPLACE AIR CONDITIONING AMPLIFIER Click here

3. CHECK AIR DUCT SENSOR

   

   
   

   1. Remove the air duct sensor Click here.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition 1 - 2 0°C (32°F) 14.5 to 19.0 kΩ 25°C (77°F) 4.8 to 5.2 kΩ 50°C (122°F) 1.6 to 2.0 kΩ

      Tech Tips

      As the temperature increases, the resistance decreases.

   
   

   NG

   REPLACE AIR DUCT SENSOR Click here

   OK

4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR)

   

   
   

   1. Disconnect the L14*1 or L87*2 air duct sensor connector.

   2. Disconnect the L77 air conditioning amplifier connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      for LHD Tester Connection Condition Specified Condition L77-21 (TFAL) - L14-1 Always Below 1 Ω L77-12 (SG-2) - L14-2 L77-21 (TFAL) - Body ground Always 10 kΩ or higher L77-12 (SG-2) - Body ground
      for RHD Tester Connection Condition Specified Condition L77-22 (TFAR) - L87-1 Always Below 1 Ω L77-11 (SG-3) - L87-2 L77-22 (TFAR) - Body ground Always 10 kΩ or higher L77-11 (SG-3) - Body ground

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE AIR CONDITIONING AMPLIFIER Click here