Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Refrigerant Pressure Sensor Circuit Short to Ground (P053011)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Gasoline Model With Manual Air Conditioning System) / Refrigerant Pressure Sensor Circuit Short to Ground (P053011)

DESCRIPTION

The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P053011

Refrigerant Pressure Sensor Circuit Short to Ground

Diagnosis Condition:

  • Ignition switch ON

Malfunction Status:

  • Short in air conditioner pressure sensor circuit

Detection Time:

  • Continuously for 4 seconds or more
  • Air conditioner pressure sensor
  • Harness or connector
  • Air conditioning amplifier assembly

Memorized

WIRING DIAGRAM

PROCEDURE

1.

CHECK REFRIGERANT PRESSURE

(a) Install a manifold gauge set.

(b) 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

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -32768 kPa(gauge)

Max.: 32767 kPa(gauge)

Actual refrigerant pressure displayed
  • Refrigerant line(gas leak etc.)
  • Air conditioner pressure sensor circuit malfunction
Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

(c) Compare the values displayed in the Data List and on the manifold gauge set.

Result

Proceed to

The values displayed in the Data List and on the manifold gauge set does not match

A

The values displayed in the Data List and on the manifold gauge set match

B
B

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

A

2.

READ VALUE USING GTS (REGULATOR PRESSURE SENSOR)

(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

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -32768 kPa(gauge)

Max.: 32767 kPa(gauge)

Actual refrigerant pressure displayed
  • Refrigerant line(gas leak etc.)
  • Air conditioner pressure sensor circuit malfunction
Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

OK:

Disconnecting the A61 connector of the air conditioner pressure sensor causes the Data List value to change.

Result

Proceed to

Regulator pressure sensor value changes

A

Regulator pressure sensor value does not change

B
B

GO TO STEP 5

A

3.

CHECK TERMINAL VOLTAGE (AIR CONDITIONER PRESSURE SENSOR)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A61-3 (+) - Body ground

Ignition switch ON

4.75 to 5.25 V

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)
OK

REPLACE AIR CONDITIONER PRESSURE SENSOR

NG

4.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the I48 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-3 (+) - I48-11 (S5-3)

Always

Below 1 Ω
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK TERMINAL VOLTAGE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A61-2 (PR) - Body ground

Ignition switch ON

3.0 to 5.25 V

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

6.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the I48 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-2 (PR) or I48-6 (PRE) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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