Inspection Procedure

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

      AIR CONDITIONER 

      INTELLIGENT TESTER - AIR CONDITIONER REFERENCE CHART
      
      

      Tester Display	Measure Item / Range	Normal Condition	Diagnostic Note
      DUCT TEMP-D	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)	-

   2. Techstream

      Air conditioner 

      TECHSTREAM - AIR CONDITIONER REFERENCE CHART
      
      

      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. 

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      NG	A
      OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
      OK (Checking from the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 

C: REPLACE AIR CONDITIONING AMPLIFIER (See  REMOVAL   ) 

A: GO TO NEXT STEP 

Fig 1: Checking Air Conditioning Amplifier

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the air conditioning amplifier with its connectors still connected (see REMOVAL  ).
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   AIR CONDITIONING AMPLIFIER (TFAL - SG-2 VOLTAGE)
   
   

   Tester Connection	Switch Condition	Specified Condition
   L77-21 (TFAL)-L77-12 (SG-2)	Engine switch on (IG) at 25°C (77°F)	1.8 to 2.2 V
   	Engine switch on (IG) at 50°C (122°F)	0.8 to 1.2 V

   HINT:

   As the temperature increases, the voltage decreases.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   NG	A
   OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
   OK (Checking from the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 

C: REPLACE AIR CONDITIONING AMPLIFIER (See  REMOVAL   ) 

A: GO TO NEXT STEP 

Fig 2: Checking Air Duct Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the air duct sensor (see REMOVAL  ).
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   AIR DUCT SENSOR
   
   

   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

   HINT:

   As the temperature increases, the resistance decreases.

NG: REPLACE AIR DUCT SENSOR (See  REMOVAL   ) 

OK: GO TO NEXT STEP 

Fig 3: Checking Harness And Connector (Air Conditioning Amplifier - Air Duct Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L14 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 

   AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR
   
   

   Tester Connection	Condition	Specified Condition
   L77-21 (TFAL) - L14-1	Always	Below 1 Ω
   L77-12(SG-2)-L14-2	Always	Below 1 Ω
   L77-21 (TFAL) - Body ground	Always	10 kΩ or higher
   L77-12 (SG-2) -Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE AIR CONDITIONING AMPLIFIER (See  REMOVAL   )