B1413

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1413/13: Evaporator Temperature Sensor Circuit

DTC B1413/13 - Evaporator Temperature Sensor Circuit

DESCRIPTION

This sensor detects the evaporator temperature and sends the appropriate signals to the A/C amplifier. It is used for frost prevention, temperature and time-lag air flow control.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT AIR CONDITIONING AMPLIFIER (TEA - SGA)




(a) Remove the air conditioning amplifier with connectors still connected.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





HINT: As the temperature increases, the voltage decreases.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. INSPECT A/C EVAPORATOR TEMPERATURE SENSOR




(a) Remove the A/C evaporator temperature sensor.




(b) Measure the resistance according to the value(s) in table below.
Standard Resistance:





NOTE:
- Only hold the sensor at its connector. Touching the sensor may change the resistance value.
- When measuring, the sensor temperature must be the same as the ambient temperature.
- As the temperature increases, the resistance decrease (See the graph).
- When replacing the A/C evaporator temperature sensor, the attached sub-harness should be replaced along with the sensor.

NG -- REPLACE A/C EVAPORATOR TEMPERATURE SENSOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C EVAPORATOR TEMPERATURE SENSOR)




(a) Disconnect the connector from the air conditioning amplifier.




(b) Disconnect the connector from the A/C evaporator temperature sensor.
(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