Toyota Yaris: Air Conditioning System / Evaporator Temperature Sensor Circuit Short to Battery or Open (P053515)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / 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: Ignition switch ON Malfunction Status: Open or short in evaporator temperature sensor circuit Detection Time: Continuously for 4 seconds or more	No. 1 cooler thermistor Air conditioning harness assembly Air conditioning amplifier assembly	Memorized

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P053515

Evaporator Temperature Sensor Circuit Short to Battery or Open

Diagnosis Condition:

Ignition switch ON

Malfunction Status:

Open or short in evaporator temperature sensor circuit

Detection Time:

Continuously for 4 seconds or more

No. 1 cooler thermistor
Air conditioning harness assembly
Air conditioning amplifier assembly

Memorized

DTC Detection Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Open in evaporator temperature sensor circuit	○	-
Malfunction	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

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

Body Electrical > Air Conditioner > Data List

Tester Display
Evaporator Fin Thermistor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT NO. 1 COOLER THERMISTOR

Click here

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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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