HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): P053011; Refrigerant Pressure Sensor Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000026Z47
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): P053011; Refrigerant Pressure Sensor Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

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.

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

(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	-32.768 to 32.767 MPaG	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

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

for HFC-134a(R134a): Click here

for HFO-1234yf(R1234yf): Click here

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 conditioning pressure sensor	-32.768 to 32.767 MPaG	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

GO TO STEP 5

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)

REPLACE AIR CONDITIONING PRESSURE SENSOR

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A61-3 (+) - I48-11 (S5-3)	Always	Below 1 Ω

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A61-2 (PR) or I48-6 (PRE) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR