RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591215 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)  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 (0.176 MPaG (1.8 kgf/cm2, 26 psi) or less) or extremely high (3.025 MPaG (30.8 kgf/cm2, 439 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 (0.176 MPaG (1.8 kgf/cm2, 26 psi) or less) or extremely high (3.025 MPaG (30.8 kgf/cm2, 439 psi) or more)


·

Air conditioner pressure sensor

·

Harness or connector

·

Air conditioning amplifier assembly

·

Cooler expansion valve

·

Cooler condenser assembly

·

Cooler dryer

·

Cooling fan system

·

Refrigerant pipe line

·

Refrigerant volume


-

WIRING DIAGRAM

E370470E15
2.146,0.396 2.302,0.594 0.156,0.198 10 false 3 2.156,0.865 2.313,1.063 0.156,0.198 10 false 2 2.156,1.344 2.313,1.542 0.156,0.198 10 false 1 1.948,0.396 2.104,0.594 0.156,0.198 10 false + 1.854,0.865 2.125,1.063 0.271,0.198 10 false PR 1.958,1.323 2.115,1.521 0.156,0.198 10 false - 0.375,2.021 0.646,2.219 0.271,0.198 10 false A61 0.365,2.167 2.531,2.385 2.167,0.219 10 false Air Conditioner Pressure Sensor 4.896,2.042 5.167,2.24 0.271,0.198 10 false I48 4.885,2.198 7.156,2.396 2.271,0.198 10 false Air Conditioning Amplifier Assembly 4.75,0.385 5.042,0.583 0.292,0.198 10 false 11 4.833,0.865 5.052,1.063 0.219,0.198 10 false 6 4.75,1.354 4.969,1.552 0.219,0.198 10 false 15 5.01,0.875 5.385,1.063 0.375,0.188 10 false PRE 5.01,0.396 5.385,0.583 0.375,0.188 10 false S5-3 5.01,1.344 5.385,1.531 0.375,0.188 10 false SG-4 5.729,0.313 6.104,0.5 0.375,0.188 10 false 5 V 6.469,0.979 6.844,1.167 0.375,0.188 10 false AD

CAUTION / NOTICE / HINT

NOTICE:
·

Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be stored if there is no refrigerant in the cycle.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>REPLACEMENT

·

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

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)>B14B8



HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.


PROCEDURE

1.CHECK FOR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.


e.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 121

Result:
Result Proceed to
B14B8 is not output A
B14B8 is output B



A

2.COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET

B

GO TO DTC B14B8

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)>B14B8


2.COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


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 conditioner pressure sensor Min.: -0.4566 MPaG
Max.: 3.2943 MPaG 		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
50003 121 51

f.

Install a manifold gauge set.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


g.

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


Result:
Result Proceed to
Data List value and manifold gauge set value do not match and Data List value: 0.176 MPaG (1.8 kgf/cm2, 26 psi) or less A
Data List value and manifold gauge set value do not match and Data List value: 3.025 MPaG (30.8 kgf/cm2, 439 psi) or more B
Data List value matches manifold gauge set value C



A

3.READ VALUE USING GTS (REGULATOR PRESSURE SENSOR)

B

8.CHECK HARNESS AND CONNECTOR

C

GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


3.READ VALUE USING GTS (REGULATOR PRESSURE SENSOR)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


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 conditioner pressure sensor Min.: -0.4566 MPaG
Max.: 3.2943 MPaG 		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
50003 121 51

OK:

Disconnecting the A61 connector of the air conditioner pressure sensor causes the Data List value to change.


Result:
Result Proceed to
Regulator pressure sensor value changes A
Regulator pressure sensor value does not change B



A

4.CHECK TERMINAL VOLTAGE (AIR CONDITIONER PRESSURE SENSOR)

B

6.CHECK TERMINAL VOLTAGE (AIR CONDITIONING AMPLIFIER ASSEMBLY)
4.CHECK TERMINAL VOLTAGE (AIR CONDITIONER PRESSURE SENSOR)
a.
E419312C20
1.438,0.198 1.938,0.448 0.5,0.25 1.896,1.167 2.208,1.594 2.208,1.594 2.344,1.594 true 0.094,0.073 0.406,0.271 0.313,0.198 10 false *a 2.396,1.5 2.708,1.698 0.313,0.198 10 false + 1.573,0.25 1.885,0.448 0.313,0.198 10 false A61
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


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



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONER PRESSURE SENSOR

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PRESSURE SENSOR>REMOVAL


NG

5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
5.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



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK TERMINAL VOLTAGE (AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.
E419312C21
1.438,0.198 1.938,0.448 0.5,0.25 1.74,1.167 2.021,1.594 2.021,1.594 2.188,1.594 true 0.094,0.073 0.406,0.271 0.313,0.198 10 false *a 2.281,1.521 2.594,1.719 0.313,0.198 10 false PR 1.573,0.25 1.885,0.448 0.313,0.198 10 false A61
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


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



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - 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
A61-2 (PR) or I48-6 (PRE) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR
a.

Disconnect the A61 air conditioner 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



Result:
Proceed to
OK
NG



OK

9.CHECK TERMINAL VOLTAGE

NG

14.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
9.CHECK TERMINAL VOLTAGE
a.
E419312C21
1.438,0.198 1.938,0.448 0.5,0.25 1.74,1.167 2.021,1.594 2.021,1.594 2.188,1.594 true 0.094,0.073 0.406,0.271 0.313,0.198 10 false *a 2.281,1.521 2.594,1.719 0.313,0.198 10 false PR 1.573,0.25 1.885,0.448 0.313,0.198 10 false A61
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


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



Result:
Result Proceed to
5.25 V or higher A
3.0 to 5.25 V B
Below 3.0 V C



A

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

B

11.CHECK INTERNAL CIRCUIT RESISTANCE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

C

13.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
10.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) or I48-6 (PRE) - Other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.CHECK INTERNAL CIRCUIT RESISTANCE (AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A61-3 (+) - A61-2 (PR) Ignition switch off 180 to 220 kΩ



HINT:

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


Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONER PRESSURE SENSOR

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PRESSURE SENSOR>REMOVAL


NG

12.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
12.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) or I48-6 (PRE) - A61-3 (+) or I48-11 (S5-3) Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.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



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.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



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR