DTC B1413/13: Evaporator Temperature Sensor Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn Techstream main switch on.
3. Select the item below in the Data List, and read the value displayed on Techstream.
   DATA LIST / AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Evaporator Fin Temperature	Evaporator temperature sensor / Min.: -29.7°C (-21.46°F) Max.: 59.6°C (139.28°F)	Actual evaporator temperature is displayed	Open in circuit: -29.7°C (-21.46°F) Short in circuit: 59.6°C (139.28°F)

   OK

   The display is as specified in the normal condition column.

   Result

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

B → See step   7 

C → See step   6 

A: Go to next step 

1. Remove the No. 1 cooler thermistor from the front evaporator.
   Fig 1: Identifying No. 1 Cooler Thermistor (Evaporator Temperature Sensor) With Connector End View

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

   Standard resistance

   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 in illustration above).

NG → See step   5 

OK: Go to next step 

1. Remove the air conditioning harness.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Air Conditioning Harness Z17 Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   z17-6 (TEA) - 2	Always	Below 1 Ω
   z17-5 (SGA) - 1	Always	Below 1 Ω
   z17-6 (TEA) - Body ground	Always	10 kΩ or higher
   z17-5 (SGA) - Body ground	Always	10 kΩ or higher

NG → See step   4 

OK → See step   6