Toyota RAV4 manuals

Toyota Sienna Service Manual: Evaporator temperature sensor circuit

DESCRIPTION

The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator temperature sensor (A/C 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 A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This sensor is used to prevent the evaporator from freezing.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

(c) Select the item below in the DATA LIST, and read the display on the intelligent tester.

DATA LIST / AIR CONDITIONER:

OK: The display is as specified in the normal condition column.

Result

2 INSPECT EVAPORATOR TEMPERATURE SENSOR

INSPECT EVAPORATOR TEMPERATURE SENSOR

(a) Disconnect the connector from the evaporator temperature sensor.

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

Standard resistance

NOTICE:

HINT: As the temperature increases, the resistance decreases (see the graph).

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

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

(a) Disconnect the evaporator temperature sensor connector.

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

(b) Disconnect the A/C amplifier connector.

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

Standard resistance

REPLACE A/C AMPLIFIER

Ambient temperature sensor circuit
DTC B1412/12 Ambient Temperature Sensor Circuit DESCRIPTION The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the ai ...

Rear evaporator temperature sensor circuit
DESCRIPTION The rear evaporator temperature sensor is installed on the rear evaporator. It detects the rear evaporator temperature. The sensor sends a signal to the A/C amplifier. The resistance o ...

Other materials:

Jam Protection Function Activates During Power Slide Door RH Operation
DESCRIPTION  It may be caused by ill-fitting slide door, faulty touch sensor or faulty pulse sensor.  The power slide door ECU activates the slide motor to open / close the power slide door, thus controlling the power slide door operation. For jam and foreign object detect ...

Removal
1. DRAIN BRAKE FLUID NOTICE: Wash brake fluid off immediately if it adheres to any painted surface. 2. DISCONNECT BATTERY NEGATIVE TERMINAL 3. REMOVE AIR CLEANER ASSEMBLY WITH HOSE 4. REMOVE BRAKE ACTUATOR WITH BRACKET (a) Release the latch of the brake actuator connector to disconnect t ...

Indicator light on the interior mirror
The indicator light flashes briefly every 2 seconds: The alarm system is switched on. Indicator light flashes for approx. 10 seconds, then it flashes briefly every 2 seconds: Interior motion sensor and tilt alarm sensor are not active, as doors, hood, or trunk lid are not correctly closed. ...

В© 2011-2022 Copyright www.tsienna.net