Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001QM7L
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1423; Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure; 2021 - 2024 MY RAV4 [08/2020 -        ]

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 kPa (2.0 kgf/cm2, 28 psi)) or less) or extremely high (2812 kPa (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

Pressure Sensor Circuit
  • Diagnosis condition: Ignition switch ON
  • Malfunction Status: Refrigerant pressure signal malfunction
  • Detection time: Continuously for 4 seconds or more (Present malfunction)
  • Air conditioner pressure sensor
  • Harness or connector
  • Air conditioning system (leaks, blocked)
  • 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)
  • Air conditioning amplifier assembly
  • Cooling fan system (cooler condenser assembly cannot be cooled down)
  • Refrigerant pressure (overcharged, lack)

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC B1423 is output

A

DTC B1423 and B14B8 are output

B
B

GO TO DTC B14B8

A

2.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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.: -456.6 kPaG (gauge)

Max.: 3294.3 kPaG (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 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

(g) Read the manifold gauge pressure when the following conditions are met.

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

Measurement Condition:

Item

Condition

Vehicle Condition

Engine running

Doors

Fully closed (windows also fully closed)

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)

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

Result

Proceed to

Data List value and manifold gauge set value do not match and Data List value: 196 kPa (2.0 kgf/cm2, 28 psi) or less

A

Data List value and manifold gauge set value do not match and Data List value: 2812 kPa (28.7 kgf/cm2, 408 psi) or less

B

Data List value matches manifold gauge set value

C
B

GO TO STEP 8

C

GO TO ON-VEHICLE INSPECTION

A

3.

READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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.: -456.6 kPaG (gauge)

Max.: 3294.3 kPaG (gauge)

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

Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

OK:

Disconnecting the A22 connector of the air conditioner 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 6

A

4.

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

(a) Disconnect the 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

A22-3 (+) - Body ground

Ignition switch ON

4.75 to 5.25 V
OK

REPLACE AIR CONDITIONER PRESSURE SENSOR

NG

5.

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

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-11 (S5-3) - A22-3 (+)

Always

Below 1 Ω
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

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

(a) Disconnect the 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

A22-2 (PR) - Body ground

Ignition switch ON

3.0 to 5.25 V
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

7.

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

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-6 (PRE) or A22-2 (PR) - 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 - BODY GROUND)

(a) Disconnect the air conditioner pressure sensor connector.

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A22-1 (-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 14

OK

9.

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

(a) Disconnect the 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

A22-2 (PR) - Body ground

Ignition switch ON

3.0 to 5.25 V

Result

Proceed to

5.25 V or higher

A

3.0 to 5.25 V

B

Below 3.0 V

C
B

GO TO STEP 11

C

GO TO STEP 13

A

10.

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

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-6 (PRE) or A22-2 (PR) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (INTERNAL CIRCUIT RESISTANCE)

(a) Disconnect the air conditioner pressure sensor connector.

*a

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A22-2 (PR) - A22-3 (+)

Ignition switch off

180 to 220 kΩ

HINT:

After turning the ignition switch off, wait at least 30 seconds before performing the measurement.

OK

REPLACE AIR CONDITIONER PRESSURE SENSOR

NG

12.

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

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-6 (PRE) or A22-2 (PR) - Other terminals and body ground

Always

10 kΩ or higher

G47-11 (S5-3) or A22-3 (+) - 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-6 (PRE) - A22-2 (PR)

Always

Below 1 Ω
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

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

(a) Disconnect the G47 air conditioning amplifier assembly connector.

(b) Disconnect the A22 air conditioner pressure sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-15 (SG-4) - A22-1 (-)

Always

Below 1 Ω

G47-15 (SG-4) or A22-1 (-) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR