Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch ON and turn Techstream ON.
3. Select the item below in the Data List, and read the value displayed on Techstream.

   Air conditioning amplifier 

   DATA LIST - AIR CONDITIONING AMPLIFIER
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   Evaporator Fin Thermistor	Evaporator temperature sensor / Min.:-29.7°C (-21.46°F) Max.: 59.55°C (139.19°F)	Actual evaporator temperature is displayed	Open circuit: - 29.7°C (-21.46°F) Short circuit: 59.55°C (139.19°F)

   OK: 

   The display is as specified in the normal condition column. 

   Result 

   RESULT REFERENCE
   
   

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

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

C: REPLACE AIR CONDITIONING AMPLIFIER 

A: Go to next step 

1. Remove the No. 1 cooler thermistor.
2. Measure the resistance of the thermistor.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   1 - 2	-10°C (14°F)	7.30 to 9.10 kΩ
   1 - 2	-5°C (23°F)	5.65 to 6.95 kΩ
   1 - 2	0°C (32°F)	4.40 to 5.35 kΩ
   1 - 2	5°C (41°F)	3.40 to 4.15 kΩ
   1 - 2	10°C (50°F)	2.70 to 3.25 kΩ
   1 - 2	15°C (59°F)	2.14 to 2.58 kΩ
   1 - 2	20°C (68°F)	1.71 to 2.05 kΩ
   1 - 2	25°C (77°F)	1.38 to 1.64 kΩ
   1 - 2	30°C (86°F)	1.11 to 1.32 kΩ

   NOTE:

   • Touching the thermistor even slightly may change the resistance value. Be sure to hold the connector of the thermistor.
   • When measuring, the thermistor temperature must be the same as the ambient temperature.

   HINT:

   As the temperature increases, the resistance decreases (see the graph ).

   Fig 1: Evaporator Temperature Sensor Resistance Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE NO. 1 COOLER THERMISTOR 

OK: REPLACE AIR CONDITIONING HARNESS ASSEMBLY