B1413

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Hatchback): B1413: Evaporator Temperature Sensor Circuit
B1413 - Evaporator Temperature Sensor Circuit

DESCRIPTION

The No. 1 cooler thermistor (evaporator temperature sensor) is installed on the evaporator in the air conditioning unit to detect the temperature of the cooled air that has passed through the evaporator and control the air conditioning. It sends appropriate signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor (evaporator temperature sensor) 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 (evaporator temperature sensor) and reads voltage changes as the resistance of the No. 1 cooler thermistor (evaporator temperature sensor) changes. This sensor is used for frost prevention.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the Techstream, read the Data List.

Air Conditioner





OK:

The display is as specified in the normal condition column.

Result





B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

C -- INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)
A -- Continue to next step.

2. CHECK FOR DTC

(a) Clear the DTCs DTC Check / Clear (from 07/2011).

(b) Check for DTCs DTC Check / Clear (from 07/2011).

OK:

DTC B1413 is not output

NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal (from 07/2011)

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

3. INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)

(a) Inspect the No. 1 cooler thermistor (evaporator temperature sensor) Testing and Inspection.

NG -- REPLACE NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) Removal (from 07/2011)
OK -- Continue to next step.

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

(a) Disconnect the D123 No. 1 cooler thermistor (evaporator temperature sensor) connector.

(b) Disconnect the D130 air conditioning amplifier assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal (from 07/2011)