RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386653 AIR CONDITIONING SYSTEM(for Manual Cooler System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Manual Cooler System)  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 (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3025 kPa (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 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

E316642
4.479,2.875 4.938,3.073 0.458,0.198 10 false N41 4.479,3.031 6.927,3.365 2.448,0.333 10 false Air Conditioning Amplifier Assembly 4.563,1.094 5.01,1.281 0.448,0.188 10 false S5-3 4.573,1.573 5.021,1.76 0.448,0.188 10 false PRE 4.563,2.031 5.01,2.219 0.448,0.188 10 false SG-4 4.229,1.094 4.677,1.281 0.448,0.188 10 false 11 4.292,1.573 4.74,1.76 0.448,0.188 10 false 6 4.24,2.042 4.688,2.229 0.448,0.188 10 false 15 1.99,1.083 2.438,1.271 0.448,0.188 10 false 3 2,1.573 2.448,1.76 0.448,0.188 10 false 2 2,2.042 2.448,2.229 0.448,0.188 10 false 1 1.656,1.563 2.104,1.75 0.448,0.188 10 false PR 1.74,1.083 2.188,1.271 0.448,0.188 10 false + 1.75,2.042 2.198,2.229 0.448,0.188 10 false - 0.375,2.563 0.833,2.76 0.458,0.198 10 false A37 0.375,2.708 2.823,3.042 2.448,0.333 10 false Air Conditioner Pressure Sensor 5.531,0.938 5.979,1.125 0.448,0.188 10 false 5 V 5.99,1.688 6.438,1.875 0.448,0.188 10 false AD

PROCEDURE

1.CHECK FOR DTC
a.

Check for DTCs.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Manual Cooler System)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes
50001 121

Result:
Result Proceed to
DTC B1423 and B14B8 are output A
DTC B1423 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 Manual Cooler System)>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 (gauge)
Max.: 3.2943 MPaG (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
50003 121 51

f.

Install a manifold gauge set.

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


g.

Read the manifold gauge pressure when the following conditions are met.

i.

Prepare the vehicle according to the table below.

Measurement Condition:
Item Condition
Vehicle Condition Engine running
Doors Fully closed (windows also fully closed)
Temperature 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:
Result Proceed to
Data List value and manifold gauge set value do not match and Data List value: 176 kPa (1.8 kgf/cm2) or less A
Data List value and manifold gauge set value do not match and Data List value: 3025 kPa (30.9 kgf/cm2) or less B
Data List value matches manifold gauge set value C



A

3.CHECK REFRIGERANT PRESSURE

B

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

C

GO TO ON-VEHICLE INSPECTION

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Manual Cooler System)>ON-VEHICLE INSPECTION


3.CHECK REFRIGERANT PRESSURE
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 (gauge)
Max.: 3.2943 MPaG (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
50003 121 51
OK:

Disconnecting the A37 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 HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)

B

6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)
4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)
a.
E349835C81
1.49,0.26 1.99,0.51 0.5,0.25 2.385,1.583 2.125,1.583 2.125,1.583 1.885,1.177 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 2.458,1.51 2.917,1.708 0.458,0.198 10 false + 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the air conditioner pressure sensor connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A37-3 (+) - 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-11 (S5-3) - A37-3 (+) 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 HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)
a.
E418807C01
1.49,0.26 1.99,0.51 0.5,0.25 1.271,1.698 1.542,1.698 1.542,1.698 1.698,1.177 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 1.063,1.635 1.521,1.833 0.458,0.198 10 false PR 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the air conditioner pressure sensor connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A37-2 (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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-6 (PRE) or A37-2 (PR) - 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 (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)
a.
E349835C82
1.49,0.26 1.99,0.51 0.5,0.25 0.906,0.75 1.177,0.75 1.177,0.75 1.49,1.083 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 0.771,0.656 1.229,0.854 0.458,0.198 10 false - 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the 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
A37-1 (-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

14.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
9.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)
a.
E418807C01
1.49,0.26 1.99,0.51 0.5,0.25 1.271,1.698 1.542,1.698 1.542,1.698 1.698,1.177 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 1.063,1.635 1.521,1.833 0.458,0.198 10 false PR 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the air conditioner pressure sensor connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A37-2 (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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)

B

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

C

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

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-6 (PRE) or A37-2 (PR) - 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

11.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (INTERNAL CIRCUIT RESISTANCE)
a.
E418807C02
1.49,0.26 1.99,0.51 0.5,0.25 1.24,1.625 1.51,1.625 1.51,1.625 1.698,1.167 true 2.354,1.615 2.083,1.615 2.083,1.615 1.865,1.177 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 1.021,1.563 1.479,1.76 0.458,0.198 10 false PR 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a 2.427,1.542 2.885,1.74 0.458,0.198 10 false +
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the 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
A37-2 (PR) - A37-3 (+) 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
12.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-6 (PRE) or A37-2 (PR) - Other terminals and body ground Always 10 kΩ or higher
N41-11 (S5-3) or A37-3 (+) - 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

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

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-6 (PRE) - A37-2 (PR) 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 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
N41-15 (SG-4) - A37-1 (-) Always Below 1 Ω
N41-15 (SG-4) or A37-1 (-) - 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