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 Detection Condition Combination Table
 

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

Body Electrical > Air Conditioner > Data List

Tester Display

Evaporator Fin Thermistor

OK:

The display is as specified in the normal condition column.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.

INSPECT NO. 1 COOLER THERMISTOR

Click here

NG

REPLACE NO. 1 COOLER THERMISTOR

OK

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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