Inspection Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on
4. Select the item below in the Data List, and read the display on the Techstream

   Data List / Air Conditioner 

   MEASUREMENT ITEM/RANGE AND DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Room Temperature Sensor (Room Temp)	Room temperature sensor / mm -6 5°C (20 3°F), max 57 25°C (135 05°F)	Actual cabin temperature is displayed	-

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

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the Problem Symptoms Table)	B
   OK (When troubleshooting according to the DTC)	C

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

C: REPLACE A/C AMPLIFIER  (See REMOVAL  )

A: Go to next step 

1. Remove the room temperature sensor.
2. Disconnect the room temperature sensor connector.
3. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   J38-1 - J38-2	10°C (50°F)	3.00 to 3.73 kΩ
   J38-1 - J38-2	15°C (59°F)	2.45 to 2.88 kΩ
   J38-1 - J38-2	20°C (68°F)	1.95 to 2 30 kΩ
   J38-1 - J38-2	25°C (77°F)	160 to 1.80 kΩ
   J38-1 - J38-2	30°C (86°F)	1.28 to 1.47 kΩ
   J38-1 - J38-2	35°C (95°F)	1.00 to 1.22 kΩ
   J38-1 - J38-2	40°C (104°F)	0.80 to 1.00 kΩ
   J38-1 - J38-2	45°C (113°F)	0.65 to 0.85 kΩ
   J38-1 - J38-2	50°C (122°F)	0.50 to 0 70 kΩ
   J38-1 - J38-2	55°C (131°F)	0.44 to 0.60 kΩ
   J38-1 - J38-2	60°C (140°F)	0.36 to 0 50 kΩ

   NOTE:

   • Hold the sensor only by its connector. Touching the sensor may change the resistance value.
   • When measuring, the sensor temperature must be the same as the ambient temperature.

   HINT:

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

   Fig 1: Identifying Room Temperature Sensor Connector And Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ROOM TEMPERATURE SENSOR  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the A/C amplifier connector
   Fig 2: Identifying A/C Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   J58-16 (TR) - J38-1	Always	Below 1 Ω
   J58-19 (SG-1) - J38-2	Always	Below 1 Ω
   J58-16 (TR) - Body ground	Always	10 kΩ or higher
   J58-19 (SG-1) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying J38 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE A/C AMPLIFIER  (See REMOVAL  )