Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028C3Z
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): P053011; Refrigerant Pressure Sensor Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

DTC

P053011

Refrigerant Pressure Sensor Circuit Short to Ground

DESCRIPTION

The air conditioning 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.

This DTC is stored if refrigerant pressure on the high pressure side is extremely low.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P053011

Refrigerant Pressure Sensor Circuit Short to Ground

Diagnosis Condition:

  • Ignition switch ON

Malfunction:

  • Short (GND) in air conditioning pressure sensor circuit

Detection Time:

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

Memorized

WIRING DIAGRAM

PROCEDURE

1.

CHECK COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET

(a) Install a manifold gauge set.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

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

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioning pressure sensor

-32768 to 32767 kPa(gauge)

Actual refrigerant pressure displayed
  • Refrigerant line (gas leak etc.)
  • Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

Result

Proceed to

Data List value and manifold gauge set value do not match

A

Data List value matches manifold gauge set value

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

Inspection Item

Regulator Pressure Sensor

Air conditioning pressure sensor

-32768 to 32767 kPa(gauge)

Actual refrigerant pressure displayed
  • Refrigerant line (gas leak etc.)
  • Air conditioning pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

OK:

Disconnecting the A61 connector of the air conditioning 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 HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - POWER SOURCE)

(a) Disconnect the A61 air conditioning pressure sensor connector.

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

Standard Voltage:

Tester Connection

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 Conditioning Pressure Sensor)
OK

REPLACE AIR CONDITIONING PRESSURE SENSOR

NG

4.

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

(a) Disconnect the A61 air conditioning pressure sensor connector.

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

(c) 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 HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND)

(a) Disconnect the A61 air conditioning pressure sensor connector.

*a

Front view of wire harness connector

(to Air Conditioning Pressure Sensor)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A61-2 (PR) - Body ground

Ignition switch ON

3.0 to 5.25 V
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

6.

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

(a) Disconnect the A61 air conditioning pressure sensor connector.

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

(c) 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