RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  B1417  Evaporator Temperature Circuit  


DESCRIPTION

The No. 2 cooler thermistor is installed on the evaporator in the rear cooling unit to detect the temperature of the air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 2 cooler thermistor changes in accordance with the cooled air temperature 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. 2 cooler thermistor and reads voltage changes as the resistance of the No. 2 cooler thermistor changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1417 Evaporator Temperature Circuit
·

Diagnosis condition: None

·

Malfunction status: Open or short in evaporator temperature sensor circuit

·

Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)


·

No. 2 cooler thermistor (for Rear Automatic Cooler)

·

No. 2 air conditioning harness assembly (for Rear Automatic Air Conditioning)

·

Harness or connector

·

Air conditioning amplifier assembly


Memorized

WIRING DIAGRAM

for Rear Automatic Cooler:
E414347E06
4.958,1.615 5.271,1.813 0.313,0.198 10 false N79 4.969,1.76 6.542,2.135 1.573,0.375 10 false Air Conditioning Amplifier Assembly 6.167,0.635 6.479,0.833 0.313,0.198 10 false AD 5.719,0.219 6.031,0.417 0.313,0.198 10 false 5 V 4.792,0.521 5.104,0.719 0.313,0.198 10 false TEC 4.813,1 5.281,1.198 0.469,0.198 10 false SG-8 4.49,0.521 4.802,0.719 0.313,0.198 10 false 11 4.5,0.99 4.969,1.188 0.469,0.198 10 false 15 3,0.521 3.313,0.719 0.313,0.198 10 false 1 3.031,1 3.344,1.198 0.313,0.198 10 false 2 1.24,1.521 2.854,1.76 1.615,0.24 10 false Z10 1.24,1.677 3.5,1.917 2.26,0.24 10 false No. 2 Cooler Thermistor

for Rear Automatic Air Conditioning:
E421590E01
4.958,1.615 5.271,1.813 0.313,0.198 10 false N79 4.969,1.76 6.542,2.135 1.573,0.375 10 false Air Conditioning Amplifier Assembly 6.167,0.635 6.479,0.833 0.313,0.198 10 false AD 5.719,0.219 6.031,0.417 0.313,0.198 10 false 5 V 4.792,0.521 5.104,0.719 0.313,0.198 10 false TEC 4.813,1 5.281,1.198 0.469,0.198 10 false SG-8 4.49,0.521 4.802,0.719 0.313,0.198 10 false 11 4.5,0.99 4.969,1.188 0.469,0.198 10 false 15 1.188,1.521 2.802,1.76 1.615,0.24 10 false W28 1.188,1.677 3.417,1.948 2.229,0.271 10 false No. 2 Cooler Thermistor 1.448,2.24 4.146,2.438 2.698,0.198 10 false No. 2 Air Conditioning Harness Assembly

PROCEDURE

1.READ VALUE USING GTS (EVAP TEMP SENSOR (REAR))
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Turn the GTS on.


d.

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


e.

Check the value(s) by referring to the table below.

Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Evap Temp Sensor (Rear) No. 2 cooler thermistor Min.: -29.70°C (-21.46°F)
Max.: 59.55°C (139.19°F) 		Actual evaporator temperature displayed No. 2 cooler thermistor system 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
Evap Temp Sensor (Rear)
50003 121 55
OK:

The display is as specified in the normal condition column.



Result:
Result Proceed to
OK A
NG (for Rear Automatic Cooler) B
NG (for Rear Automatic Air Conditioning) C



A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


B

2.INSPECT NO. 2 COOLER THERMISTOR

C

4.INSPECT NO. 2 AIR CONDITIONING HARNESS ASSEMBLY
3.CHECK HARNESS AND CONNECTOR (NO. 2 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the Z10 No. 2 cooler thermistor connector.


b.

Disconnect the N79 air conditioning amplifier assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Z10-1 - N79-11 (TEC) Always Below 1 Ω
Z10-2 - N79-15 (SG-8) Always Below 1 Ω
Z10-1 or N79-11 (TEC) - Other terminals and body ground Always 10 kΩ or higher
Z10-2 or N79-15 (SG-8) - 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

REPAIR OR REPLACE HARNESS OR CONNECTOR