Toyota Yaris: Air Conditioning System / Evaporator Temperature Sensor Circuit Short to Ground (P053511)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / 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: Ignition switch ON Malfunction Status: 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

P053511

Evaporator Temperature Sensor Circuit Short to Ground

Diagnosis Condition:

Ignition switch ON

Malfunction Status:

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

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

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

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 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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