Toyota Yaris: Air Conditioning System / Evaporator Temperature Sensor Circuit Short to Battery or Open (P053515)
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 |
|---|---|---|---|---|
| P053515 | Evaporator Temperature Sensor Circuit Short to Battery or Open | Diagnosis Condition:
Malfunction Status:
Detection Time:
|
| Memorized |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | Ignition switch ON | ○ | ○ |
| Malfunction | Open in evaporator temperature sensor circuit | ○ | - |
| Short in evaporator temperature sensor circuit | - | ○ | |
| Detection Time | Continuously for 4 seconds or more | Continuously for 4 seconds or more | |
| Trip Count | 1 trip | 1 trip | |
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored
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 | Normal Condition | Reference Value | 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 - h6-5 (SG-3) | Always | Below 1 Ω |
| h5-2 - h6-6 (TE) | Always | Below 1 Ω |
| 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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