Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028C41
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): P05347A; Refrigerant Gas Fluid Leak or Seal Failure; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

DTC

P05347A

Refrigerant Gas Fluid Leak or Seal Failure

DESCRIPTION

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal, etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.

The A/C switch indicator is turned off and the air conditioning system is stopped if the amount of refrigerant is insufficient.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P05347A

Refrigerant Gas Fluid Leak or Seal Failure

Diagnosis Condition:

  • Normal operation refrigerant amount check conditions are met.

    The following condition is detected in the normal operation refrigerant shortage check

Malfunction:

  • Amount of refrigerant is judged to be insufficient by normal operation refrigerant amount check.

    Amount of refrigerant is insufficient

Detection Time:

  • Air conditioning system operating time: 15 minutes or more
  • Refrigerant volume
  • Air conditioning pressure sensor
  • Harness or connector
  • Air conditioning amplifier assembly

Memorized

WIRING DIAGRAM

PROCEDURE

1.

CHECK REFRIGERANT PRESSURE

(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) Prepare the vehicle according to the table below.

Measurement Condition:

Item

Condition

Doors

Fully open

A/C Switch

On

Recirculation/fresh Control Switch

Recirculation

Set Temperature

MAX COLD

Blower Speed

HI

Air Conditioning Air Inlet Temperature

25 to 35°C (77 to 95°F)

(c) 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.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - POWER SOURCE)

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

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)

(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
NG

GO TO STEP 7

OK

3.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-1 (-) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)
NG

GO TO STEP 6

OK

4.

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) - I48-6 (PRE)

Always

Below 1 Ω

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

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY (SENSOR SIGNAL CIRCUIT)

NOTICE:

  • If refrigerant pressure on the high pressure side becomes extremely high, the fail-safe function stops compressor operation.
  • It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

HINT:

When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temp. sensor (thermistor assembly) and the evaporator temp. sensor (No. 1 cooler thermistor) to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

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

(b) Connect the A61 air conditioning pressure sensor connector.

(c) Prepare the vehicle according to the table below.

Measurement Condition:

Item

Condition

Doors

Fully open

A/C Switch

On

Recirculation/fresh Control Switch

Recirculation

Set Temperature

MAX COLD

Blower Speed

HI

Air Conditioning Air Inlet Temperature

25 to 35°C (77 to 95°F)

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

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

I48-6 (PRE) - Body ground

A/C Switch ON (When compressor with pulley assembly running)

0.74 to 4.61 V

(e) 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

-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:

The voltage and value displayed in the Data List change.

Result

Proceed to

OK

A

NG (The voltage changes but the value displayed in the Data List does not change.)

NG (The voltage does not change.)

B
A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

B

REPLACE AIR CONDITIONING PRESSURE SENSOR

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

A61-1 (-) - I48-15 (SG-4)

Always

Below 1 Ω

A61-1 (-) or I48-15 (SG-4) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

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

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

Always

Below 1 Ω

A61-3 (+) or I48-11 (S5 -3) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR