Toyota Yaris: Air Conditioning System / Evaporator Temperature Sensor Circuit Short to Ground (P053511)
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.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| P053511 | Evaporator Temperature Sensor Circuit Short to Ground | Diagnosis Condition:
Malfunction Status:
Detection Time:
|
| Memorized |
WIRING DIAGRAM
PROCEDURE
| 1. | READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR) |
(a) 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.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) | Actual evaporator temperature displayed | No. 1 cooler thermistor circuit malfunction |
| Tester Display |
|---|
| Evaporator Fin Thermistor |
OK:
The display is as specified in the normal condition column.
| OK |
 | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
| 2. | INSPECT NO. 1 COOLER THERMISTOR |
Click here
| NG |
 | REPLACE NO. 1 COOLER THERMISTOR |
|
| 3. | INSPECT AIR CONDITIONING HARNESS ASSEMBLY |
(a) Remove the air conditioning harness assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| h5-1 or h6-5 (SG-3) - Other terminals and body ground | Always | 10 kΩ or higher |
| h5-2 or h6-6 (TE) - Other terminals and body ground | Always | 10 kΩ or higher |
| OK |
 | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| NG |
 | REPLACE AIR CONDITIONING HARNESS ASSEMBLY |
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Turning the Engine Off
Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.