Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Refrigerant Gas Fluid Leak or Seal Failure (P05347A)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Gasoline Model With Automatic Air Conditioning System) / Refrigerant Gas Fluid Leak or Seal Failure (P05347A)

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.

If the amount of refrigerant is insufficient, the A/C switch indicator will turn off and the air conditioning system will stop operating.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P05347A

Refrigerant Gas Fluid Leak or Seal Failure

Diagnosis Condition:

  • Refrigerant shortage check is satisfied in normal operation

Malfunction Status:

  • Amount of refrigerant is insufficient

Detection Time:

  • Air conditioning system operating 15 minutes or more
  • Refrigerant line
  • Cooler expansion valve
  • 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 manifold gauge set with the following conditions met.

Measurement Condition:

Item

Condition

Vehicle doors

Fully open

Temperature setting

MAX COLD

Blower speed

HI

A/C switch

On

Recirculation/fresh switch

RECIRCULATION

Interior temperature

25 to 35°C (77 to 95°F)

(c) 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

(d) 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 match

A

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

B
A

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

B

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the A61 air conditioner 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

Switch Condition

Specified Condition

A61-3 (+) - Body ground

Ignition switch ON

4.75 to 5.25 V
NG

GO TO STEP 8

OK

3.

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

(a) 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
NG

GO TO STEP 7

OK

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

A61-2 (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 CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

NOTICE:

  • If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
  • It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

(a) Connect the air conditioning amplifier assembly connector.

(b) Measure the voltage with the following conditions met.

Measurement Condition:

Item

Condition

Vehicle doors

Fully open

Temperature setting

MAX COLD

Blower speed

HI

A/C switch

On

Recirculation/fresh switch

RECIRCULATION

Interior temperature

25 to 35°C (77 to 95°F)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I48-6 (PRE) - Body ground
  • A/C switch on

    (Compressor operating)

  • Sensor voltage is 5 V

0.62 to 4.73 V

HINT:

When the ambient air temperature is low (below -1.5°C (29.3°F)), the compressor with pulley assembly will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

OK:

The voltage value changes.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)
NG

REPLACE AIR CONDITIONER PRESSURE SENSOR

OK

6.

INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

NOTICE:

  • If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
  • It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

(a) Measure the voltage with the following conditions met.

Measurement Condition:

Item

Condition

Vehicle doors

Fully open

Temperature setting

MAX COLD

Blower speed

HI

A/C switch

On

Recirculation/fresh switch

RECIRCULATION

Interior temperature

25 to 35°C (77 to 95°F)

(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

HINT:

When the ambient air temperature is low (below -1.5°C (29.3°F)), the compressor with pulley assembly will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

OK:

The value displayed in the Data List changes.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.

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

A61-1 (-) - 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

8.

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

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

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