Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000014V1C
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 - 09/2018]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1423; Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure; 2018 MY Camry HV [07/2017 - 09/2018]

DTC

B1423

Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure

DESCRIPTION

This DTC is stored if refrigerant pressure on the high pressure side is extremely low (196 kPaG (2.0 kgf/cm2, 28 psi) or less) or extremely high (2812 kPaG (28.7 kgf/cm2, 408 psi) or more). 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

B1423

Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure
  • Open or short in air conditioner pressure sensor circuit
  • Refrigerant pressure on high pressure side is extremely low (196 kPaG (2.0 kgf/cm2, 28 psi) or less) or extremely high (2812 kPaG (28.7 kgf/cm2, 408 psi) or more)
  • Air conditioner pressure sensor
  • Harness or connector
  • Air conditioning amplifier assembly
  • Cooler expansion valve (blocked, stuck)
  • Cooler condenser assembly (blocked, deterioration of cooling capacity due to dirt)
  • Cooler dryer (moisture in the refrigerant cycle cannot be absorbed)
  • Cooling fan system (cooler condenser assembly cannot be cooled down)
  • Air conditioning system (leaks, blocked)
  • Refrigerant volume (excessive, low)

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If DTC B1423 and B14B8 are output at the same time, troubleshoot for DTC B14B8 first.

Click here 2018 MY Camry HV [07/2017 - 09/2018]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B14B8; Refrigerant Shortage

PROCEDURE

1.

PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display

Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item

Condition

A/C switch

On

Ambient temperature*

0 to 49°C (32 to 120°F)

Blower speed

HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result

Amount of Refrigerant

Refrigerant correct

Correct

Refrigerant shortage

Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

NG

GO TO STEP 14

OK

2.

CHECK REFRIGERANT PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (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

(f) Install a manifold gauge set.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT(for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

(g) 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)

Standard Pressure:

Low pressure side

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

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

OK:

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

NG

GO TO STEP 8

OK

3.

CHECK REFRIGERANT HIGH PRESSURE HISTORY

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(d) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Refrigerant High Pressure History

Refrigerant high pressure history

Min.: 0

Max.: 255

Number of times refrigerant high pressure history stored displayed

-

Body Electrical > Air Conditioner > Data List

Tester Display

Refrigerant High Pressure History

Result

Proceed to

The value is 0

A

The value is not 0

B
A

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

B

4.

INSPECT COOLING FAN SYSTEM

(a) Check if the cooling fan operates normally.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; A25A-FXS (COOLING): COOLING FAN SYSTEM: ON-VEHICLE INSPECTION

NG

GO TO COOLING FAN SYSTEM

OK

5.

RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM

(a) Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT(for HFO-1234yf(R1234yf)): REPLACEMENT

NEXT

6.

CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT(for HFO-1234yf(R1234yf)): REPLACEMENT

NEXT

7.

PERFORM REFRIGERANT HIGH PRESSURE HISTORY CLEAR

(a) Clear the refrigerant high pressure history stored in the air conditioning amplifier assembly.

Click here 2018 MY Camry HV [07/2017 - 09/2018]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: UTILITY

NEXT

END

8.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*a

Front view of wire harness connector (to Air Conditioner Pressure Sensor)

(a) Disconnect the A18 air conditioner pressure sensor connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A18-3 (+) - A18-1 (-)

Power switch on (IG)

4.75 to 5.25 V
NG

GO TO STEP 13

OK

9.

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

*a

Front view of wire harness connector (to Air Conditioner Pressure Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A18-1 (-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 12

OK

10.

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

(a) Disconnect the K55 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

A18-2 (PR) - K55-24 (PRE)

Always

Below 1 Ω

A18-2 (PR) or K55-24 (PRE) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(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)

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.

HINT:

When the ambient air temperature is low(below -1.5°C (29.3°F)), the compressor with pulley 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.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K55-24 (PRE) - Body ground

Power switch on (IG)

(A/C switch: On)

0.74 to 4.61 V*

*: While sensor voltage is 5 V.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (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:

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 CONDITIONER PRESSURE SENSOR

12.

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

(a) Disconnect the K55 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

A18-1 (-) - K55-3 (SG-4)

Always

Below 1 Ω

A18-1 (-) or K55-3 (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

13.

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

(a) Disconnect the K55 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

A18-3 (+) - K55-6 (S5-3)

Always

Below 1 Ω

A18-3 (+) or K55-6 (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

14.

REPAIR AIR CONDITIONING SYSTEM LEAK

(a) Identify the area where refrigerant is leaking from.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT(for HFO-1234yf(R1234yf)): REPLACEMENT

(b) Repair the identified area of the air conditioning system.

(c) Evacuate the air conditioning system.

NEXT

CHARGE SYSTEM WITH REFRIGERANT