RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591216 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Mechanical Control Type) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Mechanical Control Type)  B1413  Evaporator Temperature Circuit or Evaporator Fin Thermistor  


DESCRIPTION

The No. 1 cooler thermistor is installed to the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1413 Evaporator Temperature Circuit or Evaporator Fin Thermistor Open or short in evaporator temperature sensor circuit
·

No. 1 cooler thermistor

·

Air conditioning harness assembly

·

Air conditioning amplifier assembly


Memorized
(4 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.


WIRING DIAGRAM

E512551
1.865,0.792 2.198,0.99 0.333,0.198 10 false A 0.302,1.792 2.031,2.073 1.729,0.281 10 false No. 1 Cooler Assembly 4.729,1.76 5.063,1.958 0.333,0.198 10 false I162 4.729,1.948 7.052,2.198 2.323,0.25 10 false Air Conditioning Amplifier Assembly 1.875,0.573 2.052,0.792 0.177,0.219 10 false 2 1.875,1.063 2.052,1.281 0.177,0.219 10 false 1 4.76,1.146 4.99,1.344 0.229,0.198 10 false 14 4.771,0.677 5.021,0.865 0.25,0.188 10 false 13 5.021,0.677 5.458,0.865 0.438,0.188 10 false TE 5.031,1.146 5.438,1.333 0.406,0.188 10 false SG-3 5.865,0.271 6.115,0.458 0.25,0.188 10 false 5 V 6.458,0.792 6.708,0.979 0.25,0.188 10 false AD 1.875,1.271 2.208,1.469 0.333,0.198 10 false A 4.125,0.781 4.458,0.979 0.333,0.198 10 false I160 4.146,1.26 4.479,1.458 0.333,0.198 10 false I160 3.604,0.656 4.115,0.875 0.51,0.219 10 false TMP1 3.604,1.094 4.115,1.313 0.51,0.219 10 false TMP2 2.177,1.792 3.708,2.344 1.531,0.552 10 false Air Conditioning Harness assembly 4.229,0.573 4.406,0.792 0.177,0.219 10 false 4 4.229,1.052 4.406,1.271 0.177,0.219 10 false 8

PROCEDURE

1.READ VALUE USING GTS
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Air Conditioner / Data List.


e.

Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Evaporator Fin Thermistor No. 1 cooler thermistor Min.: -29.70°C (-21.46°F)
Max.: 59.55°C (139.19°F) 		Actual evaporator temperature displayed No. 1 cooler thermistor circuit malfunction
·

When open circuit: -29.70°C (-21.46°F)

·

When short circuit: 59.55°C (139.19°F)


Body Electrical > Air Conditioner > Data List
Tester Display
Evaporator Fin Thermistor
50003 121 3
OK:

The display is as specified in the normal condition column.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

2.INSPECT NO. 1 COOLER THERMISTOR
3.INSPECT AIR CONDITIONING HARNESS ASSEMBLY
a.

Remove the air conditioning harness assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for Gasoline Model)>DISASSEMBLY


b.

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

E512552C01
1.583,0.458 1.938,0.656 0.354,0.198 5.156,0.448 5.542,0.656 0.385,0.208 4.573,1.385 5.115,1.552 true 4.604,1.948 5.115,1.729 true 1.24,0.479 1.552,0.635 0.313,0.156 10 false *a 4.771,0.49 5.083,0.646 0.313,0.156 10 false *b 1.708,0.49 1.865,0.688 0.156,0.198 10 false A 5.219,0.469 5.646,0.729 0.427,0.26 10 false I160 4.177,1.292 4.667,1.552 0.49,0.26 10 false TMP1 4.188,1.885 4.677,2.146 0.49,0.26 10 false TMP2
*a Front view of air conditioning harness assembly connector
(to No. 1 Cooler Thermistor) 		*b Front view of air conditioning harness assembly connector
(to Vehicle Side Connector)


Standard Resistance:
Tester Connection Condition Specified Condition
A-2 or I160-4 (TMP1) - Other terminals and body ground Always 10 kΩ or higher
A-1 or I160-8 (TMP2) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for Gasoline Model)>DISASSEMBLY


4.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the I162 air conditioning amplifier assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I160-4 (TMP1) - I162-13 (TE) Always Below 1 Ω
I160-8 (TMP2) - I162-14 (SG-3) Always Below 1 Ω
I160-4 (TMP1) or I162-13 (TE) - Other terminals and body ground Always 10 kΩ or higher
I160-8 (TMP2) or I162-14 (SG-3) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT (for Gasoline Model)>DISASSEMBLY